, -r % .+ Annls Lirnnol. 31 (4) 1998 : 413-435
Stream insects anc! gastropods in the island of Gran Canaria (Spain)
A. ir;. XiissonI B. blalmqvist' 31. Báez' J. H. Blackburn? P. D. Armitage:
Kéywords : aquatic insects, gavopodj. streams, Canxy Islands.
The current status of the stream-living insects and gastropods of the island of Gran Canaria in the Atlantic Canary Islands is documented. Data from semiquantitative kick samples taken in 11 sveams are supplemented by non-standardized collecting in the same and ten additional streams. The kick samples included some 9.OOO specimens of 9s taxa, and in total 123 taxa were recorded from the studied streams in 1994 and 1993. The stream fauna was dominated by Diptera with some 80 taxa, followed by Coleoptera with 37 species known from the island. The kick samples yielded 11-36 species per sveam and visit, whcreas up to 4S spccies were scored when al1 collecting methods were included. Local diversity given as Fishcr's a ranged from 3.2 to 10.3. Clustering showed only weak spatiai panerns and resultcd in much highcr similarities among locaiities when based on the semiquantitative samples than when based on presencdabsence including records from ali coiiecting methods. Species disa-ibu- tions among localities were not significantiy nested. 'ihe faunal similarity wirh the adjaccnt island of Tenerife is smking. SU. of the Tenerife species are seemingly absent from Gran Canaria, whereas Gran Canaria has 13 species not found in Tenerife. Most of the 22 aquatic insect species in Gran Canaria oniy known from oldcr records. prefer lentic habitats not included in OUT study. Al1 except one of the five species endemic to Gran Canaria are considered extinct or on the edge of extinction. Increased future extinction rates are predicted as a response of the extreme habitat loss. with only three permanent streams known on the island toda.
Les insectes et les gastéropodes d'eau courante de I'ile de Gran Canana Fpagne)
Mots-clés : insectes aquatiques. gastéropodes, cours d'eau, Iles Canaries.
La situarion actuelle des populations d'insectes et de gastéropodes d'eau courante de l'ile de Gran Canaria (Iles Canaries, Océan Atlantique) est évalute. Des données obtenues par «kick sarnplesm semi-quantitatifs et provenant de 11 cours d'eau ont ¿té aupmentées par des récoltes non standudisées, effectuées sur les memes cours d'eau et sur dix cours d'eau supplémentaires. Les < 1. Depmnenr of Animal Ecology. U'niversity of Urne;, SE-901 87 L'rnea. Swedcn. 2. Deparmear of Zoology. Unibersity ofL3 Lapna. 39206 La Laguna. Tenenfe. Spain 3 Insriiiiw o!' Freshwxer Ecolopy. East Sioke. iVareh3rn. Dorser BHlO 635.Frri3nd. 4 13 A.K. NLSSOS. B. &1.4I.>lQVIST~bl. B&Z. J.H. BLACKBL'R.. . P.D. AR\íITAGE : : 1. Introduction of microhabitats was maximized and always included pans of the margins. The Atlantic Canas Islands. off the coast of bloroc- co. harbour a relatively rich fauna of strearn-living Srnall ponable light traps were used on the following rnacroinvertebrates uith high levels of local endemisrn occasions in or&r topct adults of Trichoptera and Dip- in sorne taxa. This interestins fauna \vas firjt investiga- ter3 to suppor; lmai ideritificarioris : Aruaje 3l.iii.- ted more intensivelu throush the expeditions made by 1.iv.1994 XCO-05.30 ana 17-lb.xi.1995 18.10-08.40; the Finnish entornologists Richard Frey. Ragnar Stora Xlina 2 19-SO.xi.1995 17.00-09.30: Soria 1 28- 29.iii. 1994 18.00-09.30; Tirajana 3O.iii. 1994 20.00- and Hakan Liridberz (e+ Frey 1936. Lindberg 1953 ; see Machado 1987a for a full bibliography). Besides a 24.00. 2 i.1995 lS.30-2i.30. ar,d 16.xi.1995 18.30- feu later repon5 on selectea orders oi families (e.g. 2 1.30. Báez 1985, Balke et al. 1990, Crosskey 19SS, híacha- Discharge [vas estirnated as the product of mean do 19S7b). more recent documentation of thc entire depth. width. and surface velocity conected with a macroinvenebrate communities is so far lirnited to the cocfficienr of 0.67 to give mean vrlocity. Conductivity, island of Tenerife (Annitage et al. 1995, Fíalmqvist et pH and water temperature were rneasured directly in al. 1993, 1995). the field. Macroinvenrbrate samples were soned im- mediately preserved individually in 70% ethanol Of the other islands, the comparatively large and or least isolated islands Fuerteventura and Lanzarote are and soned out frorn debns later in the sarne da. relatively dry and are generally without permanent iVe used Fishera as a measure of diversity that is in- stream habitats (Marzo1 1984). The westernmost is- dependent of sarnple size (Maguman 1988, Rosenz- lands La Gomera, Hierro and La Palma are wetter, but weig 1995). This diversity index is based on the as- their faunas are poorly documented. Gran Canaria has sumption that the abundanccs of species fit a log-series a high naturai potentiai for harbouring a fauna as nch disuibution. Smail, incomplete samples of other distri- as that of Tenerife, due to its relative large size, high butions aimost fit the log-series. precipitation, and low degree of isolation. However, Similarity among stream localities was analysed by chiefly due to water diversion and forestry, the nurnber tree clustering. ihe purpose of this aigonthm is to join of Gran Canarian strearns has dropped frorn 285 to 20 objects into successively larger clusters, using some between 1933 and 1973 (Alfonso Pirez 1980, in measure of sirnilarity or distance. We used the Un- Crosskey 1988). Today, the number of more permanent weighted pair-group average (UPGMA) algonthm, in strearns is even lower. which the distance between two clusters is calculated In order to document the current situation of the as the average distance between al1 pairs of objects in Gran Canarian strearns and their fauna. three of us the two different clusters. (Báez. blalrnqvist RC Nilsson) visited the island on two Xestedness analysis (Patterson & Atrnar 1986) was occasions, first in hlarch 1991 and then asain in No- used to test for structure in the distribution of species vember 1995. Our major aim u'as to res.kit strearn lo- arnong Sireamj. If distributions were strictly nestrd. calities known from the literature, as well as finding each spccies would occur in al1 streams that have fetver others thar had not been docurnented earlier. and des- species than the richest one in which it occurred. De- cribe their current macroinvenebrate fauna. viations from this pattern were scored by summing al1 absencrs frorn poorer streams over al1 species. The sig- 2. Material and methods nificance of the resulting index was then tested against randomized data (RANDOM 1). Gran Canaria was visited for collecting during two periods : 27 March to 1 April 1991 and 16-2 1 Novern- 3. Studied localities ber 1995. Invenebrates were collected using a cornbi- nation of different techniques : hand-nets. kick-sarn- The studied localities (Fig. 1) are listed in Tab. 1 and plins. direct picking, and turning of stones. Care was selected chemical and physical characteristics are gi- taken to include al1 possible microhabitats. Besides ven in Tab. 2. Al1 localities sarnpied in 1994 ivere revi- this qualitative sarnpling, semiquantitative net samples sitedin 1995 and sampled again if carrying water. Thc were taken in the iarger strearns. The sampling proce- follouing sites u'ere tc:z:ly dty in !O95 : Brezal, Hon- dure involved taking 30s kick sarnples over one rn? do de Abajo, Hornos. Mina 1 8: 7, Peréz darn. Sona 1 areas wirh a srnall handnet. li'hen possible three 8: 2. At the following sites no running water was found samplec ueie taken in nfflej and three in strearn pools in 1995. but isolated pools were sampled quaiitatively : "t each !ocd¿t)'. Sixzples werc t&en so that rhe number Coruiia, hloya. SoriJ 3, arid 'Tirajaana. STRE.L\l LXSECTS AYD GASTROPODS Is GRAS CkY.4Ri.A 415 , Fig. 1. Map of Gran Canaria with the position of our snidy sites. coded as :(1) Moya, (2) Azuaje. (3) Brezal, (4) Coniñs. (5) PCrez dam. (6) Mina 1. (7) Mina 2, (8) Mina 3, (9) Carrital 1-2, (10) Sibcrio. (11) Tejeda. (12) Gañanías, (13) Cemicalos, (11) Soria 1, (15)Sona2.(16)Los Hornos.(17)Soria3. (lS)Tuajana.(I9)Ouauadeque. Finelmes show altinides of 500. lo00 and 1500 rn asf. Fig. 1. Canc de Gran Canaria avec crnplacernent des 19 sites CmdiCs. Les lignes fines fi- gurent les altinides 500. lo00 et 1500 rn. 3. List of limnic gastropods and insects 4.1. Gastropoda known from Gran Canaria iincylidae Ancylus striatus Quoy Gairnard. 1833 hla Distributions are given directly after the species 8; names. and coded as : (GC) endemic to Gran Canaria, This species was found in al1 but two of the sveams in which (Ca) endemic to the Canary Islands (F= Fueneventura. semiquantitative net samples were taken (Tab. 3). Also found at al1 but five of the qualitative sample sites (Toble 4). 'he G= Gomera, Hierro, Lanrarote. LP= La Palma. H= L= sires wherc it was absent tended to carry very little water or Tenenfe), (Ma) endemic to Macaronesia (Madeira T= had no flow at all. plus the Canary Islands), (Me) hlediterranean. (WP) Physidae West Palearctic. (Af) Afnca. (Am) Amerita. and (Co) cosrnopolitan. Physeila acim (Drapmaud. 1SO5) hle (Co) This was the mosi aidespread gusuopod species in Gran Ca- Thz followin,o list includes a11 spccies of th. treated naria. and H: íound it in al1 streams in which semiquantitati- groups that have bien recorded from Gran Canaria. ve net samples were takzn, except Sona 1 (Table 3). AISO Our spccies records from the serniquantitative san- found in qualitative samples at : Carrizal 1-2. Hondo de Aba- plin,o localities are given in Tab. 3. Presence of species jo. md Soria 3. The sites where ir was absent tended to carr). ac the rest of the localities is given in Tab. 4. ven little H'ater or had no flow at dl. 416 X.K. KILSSOS. B. XIhLhfQMST. hl. B.qZ. J.H. BLACKBURN. P.D. AR\lIT.XGE . (4) Table 1. List of hesnidied stream localities in Gran Canaria with theu altinides in m as1 and a general dcscnption of the sampled ha- bitats Tableau 1. Liste des sitts CnidiCj de Gran Canaria avec Icurs altinides en m et une descriprion géniralc des habitars. Barranco Locality Altitude tlabitat Date Azuaje 1 km Vi Firgas 240 streJm 940401 8 951 117 Brezal 2 km ESE Moya, nr Los Tilos 570 canal 930331 Carrizal 1 7 km ENE San Nicolás, nr Parrallilo dam 290 small stream 551 120 Carrizal2 6 km ENE San Nicolás 250 small stream 951 120 Cemicalos 6 km WSW Telde at Lomo Magullo 570 stream 040327 8 951 1 16 Corufia 3 km NW Artenara 980 stream 940330 8 951 118 Gaiianías nr Las Lagunetas 1250 wet rock 940328 8 951 119 Guayadeque 7 km WNW Ingenio 970 trickle 940327 8 951 1 16 Hondo de Abajo 6.5 km SE Agaete, nr Pérez dam 825 small stream 940330 Hornos Los Hornos 1640 trickle 940329 Mina 1 Hoya de la Montana 1390 cascade 940328 Mina 2 2 km SW Las Lagunetas 1350 stream 951 119 Mina 3 nr Utiaca 770 trickle 940328 Moya nr Moya 290 trickle 940331 8951117 Pérez dam 6.5 km SE Agaete 820 wet rock 940330 Siberio 9 km ESE San Nicolás 450 trickle 951 120 Sona 1 1 km W Ayacata 1370 trickle 940329 8 951 118 Sona 2 4 km SW Ayacata 925 stream 940329 Soria 3 6 km SW Ayacata, nr Niiias dam 91 o stream 940329 8 951 118 Tejeda 1 km SSE Tejeda 1040 stream 940x8 8 9511 18 Tirajana nr San Bartolomé de Tirajana 890 stream 930329 8 951 116 Lymnaeidae Píunorbelía duqi (Wetherby. 1879) Am Gdbu cf. ciibenris (Pfeiffer. 1839) Arn This species uas only found at Azuaje, whcre it seemin,oly was more abundant in 1993 than in 1994 (Table 3). Besides in five of the streams in which semiauantitative net sampies were taken (Table 3 1. this species was also found at Hydrobiidae Guayadeque. The unidcntified species we have found most probably be- Pseridosrrccinea colunielici (Say. 1S 17) Xrn longs to thc gen& Hjdriobia (Proschwitz. in fitr).All our spécirnens wre found at Azuaje in 1993. Besides in four of thé strcarns in which semiqumtitative net sampier ivere taken (Table ?j. this species H'as also found at 4.2. Ephemeroptera Chmzal 1 and 2. Baetidac Planvhíidae Baer!J cmnricjnsis h.liil!er-L krienau, 197 1 Ca (G LP TI G~WUSpumus (Say. 18 17) Arn This Canarian endemic was first dcscribed from BCO.de 13 This species was collected in six of the strearns mentioned in hlina at I.lj0rn ajl. and hlüller-Liebcnau (1971) also repor- Table 3. At Azuaje. only a few specimens were hand-collec- ted it from Bco. Los Propios at jOOrn and Bco. Apaete a[ Ir-d -;70-;?3n!. !','c twnd it ahiindnrit a! Crrnicalos and Minn 1. STREAM ISSECTS AND GASTROPODS IS GRGCASARLA 417 Table 2. Sclected cheMcal and physical chmctenstics of the water in the swearns. Variables coded as: (Cond.) conductiviry in ms/crn, (Ternp.) rernperanire in 'C. (Row) tlow oí stream in Us. Tableau 2. Caraciéristiques physiques et chimiques de I'esu dans les cours d'cíu le jour de notrc visite. C~CSdes vuiíbles : (Cond.) conducti- vitC en mslcrn. (Ternp.) iempirarurc en 'C. (Fiou.) dibit en Us. Locality Date Cond. pH Ternp. Flow Azuaje 940401 20% 7.45 15.4 2 951117 2820 8.1 18.3 13 Erezal 950331 971 8.82 17.8 0.5 Carrizal 1 951120 744 7.88 15.4 o.1 Carrizal 2 951 120 5 Cernicalos 940327 233 7.65 13.3 13 951116 24 1 7.85 16.7 12 Cotufia 940330 608 7.65 12.5 17 951 118 80 1 6.54 16.5 0 Gafianias 940328 136 7.23 13.3 10 951119 181 7.9 12.8 <1 Guayadeque 940327 210 7.61 16.4 0.G5 951116 205 7.84 18 0.04 Hondo de Abajo 910330 614 7.57 15.9 1 Hornos 910329 279 7.44 9.2 0.1 Mina 1 940328 385 8.39 15.3 15 Mina 2 951119 136 7.96 11.6 18 Mina 3 940328 913 7.01 14.9 0.3 Moya 940331 1130 7.79 16 1 951117 1569 8.35 25.4 0 Pérer dam 940330 51 1 7.99 13.4 1 Siberio 951 120 603 7.4 18.1 0 Sona 1 940329 249 7.92 11.8 0.1 Soria 2 940329 330 8.1 4 18.2 10 Sona 3 940329 31 4 8.61 16.8 2 951118 1109 8.29 15 0 Tejeda 940328 604 8.3 18.9 35 95i 118 1296 7.25 19.5 <1 Tirajana 940329 243 7.05 15.7 3 and present also at Soria 2-3. Tejeda and Tirri-isna (Tablcs Cloeon sp. 1 ísensu hlalrnqvist et al. 1995) 3-4). Specirnens assigned to this species were found in qualitative Baeris nigrescenr Kavas. 1932 hle samples frorn Cernicalos and Coniiia (Tables 3-4). This species was first descnbed frorn Los Tilos in Gran Cana- Cioeon sp. 2 (sensu hlalmqvist et al. 1995) na, and later reponed frorn Bco. de la Mina at 1.150rn and b'e collected this species at the following strearn sites : Bco. Los Propios at 500m (hlüller-Liebznau 1971). We found Azuaje, Carrizal 1. Coruña, Hondo de Abajo, Hornos, Moya, it in the semiquantitative samples at the following localities Siberio. Soria 2-3. and Tuajana (Tables 3-4). (Table 3) : Azuaje. Cernicalos. Mina 2. Tejeda and Tirajans.. Caenidx Baeris pseudorhoúani hlüller-Liebenau. 197 1 Ca (G LP T) Caenis liicfiiosn (Burmeister. 1539) MT' hlüller-Liebenau (1971) descnbed this species frorn the sa- me site as B. canariensis. and found it alsc iii BCO. Agaete ar This specics \vas abundant at Azuaje. and occasional lmae Los Berrazales. \Ve found it abundantly at Ccmicalos and werc found also at Carrizal 1 Br 2 and Sibrrio (Tabs 3-4). Mina 7, and present also at Mina 3. Soriri 3. and Tejeda (Tables 3-4). 4.3. Odonata Cloeon diptenim (Linnaeus. 1761) WP Coenagrionidae Besides the six localitics given in Tab. 3. this spesies \vas al- Ischniira snhnrensis Aguesse. 1965 Af so found at Carrizal 1 L. 2. Hondo de Abajo. and Soria 3 This species \vas first recorded frorn Gran Canaria by Valle (TabIc 4). i1955: Aldea San Kicolás) misidentified aj 1. senegnlensis. 418 A.N. NILSSON. B. BI..\LMQVIST, M.BÁEZ, J.H. BLACKBURV, P.D. AIL\IITAGE (6) Table 3. Contens of net smplei from selected Gran Canaria suems in 1994 and 1995. Valucs represent rhrec pooled samples hrn nffIes (Ri or pisfP). Rejense in quaiimtivc samples given with aX* is not included in rhc rummations. Tableau 3. Contenus des ricoltes au fila des cours d'eau de Gnn Canvia visitís en 1991 et 1995. Les chiffres représtntcnt Vois rtcoltes de ra- diers IR) et de rnouilles (P). La présence dms des rícoltes qualitatives marquée pa~rxu n'est paj comptabilisie dan5 les totaux. Taxa ).*ajo COr??JCdOS Cauta !Ana 2 b.ciu5 .*a SI 95 94 95 9: 95 9: 9i - ~PRPRPRPRPRP~PRP Gutfopodr A,%fl-'S S?a?JS 2c3 5 6 4 E 8 12 18 1 114 5 Pnysab asta 24 72 la 29 1i 12 6a 1 1 3; 7 13 Galbd cf. CuOOnSiS 2 2 14 Psoumsuccinea cciumolla 1 3 25 Gyrac)usparvvs . x 2 11 3 42 1 1 P&70r*Od3 dU@ 3 4 áJ62 U{drJbiidaa 'nd4L 7 299 3X 7'3 43 43 15 3 4 3 1: 1 S3 9 23 3 33 x X 22 5 ¿u X X 1 9 12 1129s 4 18 2 X '2 2 a 2 1 x 4 x13 x21 1 12 4 I X 18 x X 1 55 6 3 13 111 x 6 2 1 1 6 5 914 x 9 1 7 1. x 6 15 23 20 l 1 2 1 x 4 8 I 15 3 11 X x 1 x x x X X x 112 1 X X 2 5 19 22 24 18 1 3 1 111 7 E (7) SiREAM KSECTS AYD GASTROPQDS I'i GRAN CXVARW 419 Table 3 ísonrinued). Contcnu of nct rsmples from selected Gran Canuia strcms in 1994 and 1995. Valucs represent tkce pooled samplcs from rifiies (R)or pmls (P). Resence in qu&ira:ive samplcs pven wirh «x» ij not includcd in &e sünmxionj. Tableac 3 ísuite,. Contcnus des rZcoltes su fiiet des cours d'eau de Gran Csnaiia visitis en 1994 et 199'. Les chifíres reprCscncent voij rtcoltcs de raai::j t RIei be nouilles I P}. La prfjen:e dan5 des rCCd::j qualitatires narc,?iée pu«x* n'cít pas compiabilistc dms les toiasx. Tau A:uaja Cern.cai% .:ccruiw !Ana ¿ '.%?a2 'kys 93 95 92 55 e: 95 í.: $4 1 12 X 1 ..-,, l 28 5 .! 52 9 29 19 46 223 7.3 15 1 X r1 1 2 1 92E31 I 4 41 X X 7 X X X 89 14 39 5 X 153 810 127 1 21 60 2 167 141 188 532 X 10 3 ia 1 11 1 2 15 2 1 1 2 1 1 1 1 1 21 1 a9 22 2 37 1 8 2 135 2 10 1 :c-9 -.c- ji 5 73 13 3 42 1 1 2 32 4 12 207 ¿5 32 5 1 51 15 1 1 315 7 X X 102 1 1 7 1- 1 3 1 11 275 la 1 13 f 1 13 1 2 X 2 1 11 63 X X No. of indi. 615 156 042 112 S56 4.59 296 253 932 422 290 60 040 366 251 1u) 420 A.X. NLSSON. B. Xl.ChlQVIST'. hl. Bm.J.H. BLACk3URhi.P.D. ARMITAGE 1 E 1 :7 3 1 ?5 X X 1 2 X ..I X 1 1 5 18 1 13 5 1 X 3 1 X 11 X 1 x X 4 :O 233 6 X 2 21 12 116 1 X v .Y X 3 X x1 X 1 1 3 13 X 1 111 X XC X X X X X X X X X 1 X X x 2 1 5 X X X X X X 1 x 2 2 6 1J 12 X 1 16 4 56 31 32 1 x 1 S3 I 2 3 15 17 26 (9) SiREAM NSECTS AND QAS'IROPODS IN GRNi CAiiARi.4 .-. 42 1 Table 3 (continued). Cononu of ner samplcs frorn relectcd Gran Canaria streams in 1991 and 1995. Valucs reprcsent threc pooled samples from riffies (R)or pls(P). Presence in qualiouve samplcs given wirh *x* is nor included in hesummations. Tabieau 3 (suire). Contenus des rkolies au filet des cours d'eau de Gran Canaria visités en 1994 et 1995. Les chiffres représentent uois récoltcs de radiers (R)e: de rnouillcs (PJ. La présencc dans des récoltes qualitatives marqute par «x* n'est pas comptabiiisCe dans les totaux. laxa swm soda1 SoPa2 i@e& 7i*a 95 94 o? 94 95 94 P RPRPRPRPRP 1 1 2 1 1 1 A 1 19 6 31 3 2 95 1 172 X sa, 10 1 x. X 63 6 1 1 4 12 1 5 X 1 1 2 10 3 3 1 6 2 1 3 4 15 1 1 5 106 2 71 2 23 2 4 221 3 12 77 44 X 3 4 13 42 ó1 5 28 40 X 1 4 3 8 1 3 1 A 1 X 1 6 1 1 1 X 197 66 11 223 aa im 13-1 715 17i 395 222 NO. OliJXl 19 8 6 12 17 16 25 21 17 17 24 c Belle (1982) collected it at Maspalomas in 1981. \.Ve collec- Beiie (1982) collected this species ar Maspalomas, and Baez ted larvae in stream pools at Canizal 2 and Sibeno. (unpubl.) recorded it from Bco. Fataga. ingenio and Argui- Aeshnidae neguín berwecn the yean 1976-1986. Ana imperaror Leach. lSl5 WP Herniunar ephippiger (Burmeister. 1839) Af "he only record from Canaria we have seen is that of This species W~Srepoiíed from Sta Bngida by Vaiie (1935). Gran Belle (1982)'from Maspalomas. In the penod 1976-1986 Báez (unpubl.) recorded it from se- veral additional localities : Bco. Fataga. Agaete, Tafira Alta. Libellulidae Las Palmas and Teélde. Our only more recent record is from Ortherrum chtysostigm (Burmeister, 1839) Af rock pools at hloya in 1995. This species was fint recorded from Gran Canaria by Navas Anarparrhc::opc Wss, iS?9 V,T (1906; Tcior), and 1a:er by \'di.- (1935) frorn Las Lagunstas 422 STREAbI INSECTS A&%OASTROPODS Is GRAi CAV.4Ri.4. Table 4. List of ~3.~3found in qualiiative samples from the localiues or visits widiout quantirarive sampling. Localities coded as: (Br) Brezal. (Cal-2) Carrizil 1-2. (co5) Coda 19%. (Ga45) GaÍíMas 1994 & 1995. (Gu4-5) Guayadcque 1994 k 1995. (HA) Hondo de Abajo, (Ho) Hornos. (híii) Mina 1. (hío5) Moya 1995. (Pd) Pertr dam. (534-35) Sona 3 1994 6i 1995. and (TU) Tijana 1995. Tableau 4. Lizcc des t3xa t:ouvés danr des rtcoltcs qualitatives de siies ou de pr¿l¿vements non qumucjtifs. Codes des localitts :mr.) Brezal. (Ca 1-2)Carrizal 1-?. íco51Coruña 1995. (Ga 4-5) Gañanias 1994 B: 1995. (Gu 4-51 Guaysdcque 1994 k 1995. (HA)Hoiido de Abajo, (Ho) Hor- nos. (hlii) Mina 1, ih105) hf0p 1995. (Pdj Percz dam. (S 34-35) Socia 3 1994 CL: 1995 et (Ti51 Tiajana 1995. Locality ür Cal Ca2 c05 Ga4 Ga5 Gu4 Gu5 HA Ho Mil LIcS Pd S34 -Taxa S33 Ti5 Gasropuda Ancylus s!ria:us xx x x x xxx xx x Physe!la acuta xxx X xxx Galba cf. cubensis X X Pseudosuccinea wlumella xx X Ephemeroptera Baetis canariensis X Baetis pseudorhodani X Cloeon dipterum xxx X X xx Cloeon sp. 1 X Cloeon sp. 2 X xx X Caenis luctuosa xx Odonata Isc?inura saharensis X Anax imperaor X Orthetnrm chrysosligma X X Crocofhemis erythaea xx X Sympetrum fonscobmbei X Sympetrum nigritemur X Heteroptera Carixa aninis X X Sigara lateralii X Notonecta canariensis xx . xx Mesovelia virrgera X Merragata h ebroides X hlicrovelia gracillima X Ve1;a lindbergi X X Coleoptera Gyrinus dejeani X Gyrinus urinator X Haliplus linealocollis X xx HydropOruS emns X XXXX Graprodytes delechrs X X Stic:onectes canariensis xx - Nebrioporus canariensis X Agabus bigUnatus X xxx X Agabus nebulosus ' xx X X hieladema coriacea X X X L accophilus hyalinus X X xx Ochthebius quaddfoveolatus X X Ochthebius rugulosus X X Hydraena senic-tlis .x Limnebius grac¡l¡pes X X Hydrochus grandicollis X Lacccbius canariensis X X Anacaena haemonhoa X tieiocha:ts Cvidus X X X Dryops gracilis X xx xx X X (1 1) AX. NILSSON. B. MALhfQVIST. bf. BÁEZ. J.H. BLACfCBUkY. P.D. ARiifTT.4GE 433 Table 4 (conrinued). Lisc of taa found in qualicative samplcs from the ~cfalitiesor visiis without quantitatiw sampling. Localitks codcd a:(Br) Brezal. (Cal-?) Carizai 1-2. (co5) Conifia 1995. (G34-5) Gañanh 1991 & 1995. (Gu4-5) Guayadeque 1994 & 1995. (HA) Hondo de Aba- jo. (Ho) Hornos. (Mil) Mina l. 0105) Moya 1995. (Pd) Perér dam. (SU-35) Sorir 3 1991 k 1995. and r15)Tuajan3 1995. Tablcau 1 (suite). Liste des casa VouvCj dans des récoltes quaiitatiws de sices ou de prCltvemenu non quanlitatifs. Codes des localids :(Br.) Bre- zai, (Ca 1-2) Carrizal 1-7. ICoS) Coruña 1995. (G34-5) Gaianías 1994 8: 1995, (Gu 4-51 Guayadcquc 1991 k 1995. (RA) Hondo de Abajo. (Ho) Hornos. (Mil) Mina 1. (Nos) Moya 1995. (Pd) Pcrez dam. (S 34-33) Soria 3 1991 8: 1995 er ri5) rijana 1995. Locality iaxa Br Cal Ca2 Co5 Ga4 Ga5 Gu4 GuS HA Ho Mil Mo5 Pd S34 S35 Ti5 Trichoptera iiydroptila fortunafa X X xx Orlhotrichia angustella X Oxyethira sp. X Stactobia storai Tinodes cananensis X Hydropsyche maroccana X Mesophylax aspersus X xxx X Oiptera Lirnoniidae indet. X X X X Psychcdidae indet. xx X Dixa tetrica X xx xx X Anopheles sp. X X X Culiseta longiareolata X X Culex sp. xx X X Thaumalea subafricana X Simuiium guirnad X X Simulium intermedium X X xxx X Simulium paraloutelense Simulium Mcorne xx x Ceratopogonidae indet. X X X Ablabesmyia dusoleiii X Macropelopia sp. xx Procladius choreus xx Zavrelimyia barbatipes X xx xxx Chaetocladius sp. X Cricotopus (lsocladius) sp. X Eukieifenella brewcaicar/clanpennis X Eukieifenella minor X X Oehocladius (Eud.) iuscimanus X Oehacladius (Euo.) rivicola xx X Orthocladius (O.) pedestris xx xx Parametriocnemus sfyiafus X X X Paratrichocladius sp. X xx X Psectrociadius sp. X X Rheocriwtopus atripes X Thienemanniella sp. nr clavicomis x xx Chironomus sp. X X X X X Dicrotendipes sp. X Phaenopsectra sp. x. Cladofanytarsus sp. xx Abcropsectra 9. xx X Rheotanytarsus sp. X X Virgafanflarsus sp. X X Tanytarsini indet. xx OA~XIa yrancanarieiensis X Dolichopodidao indet. X Limnaphora sp. X tJo. of taxa 8 21 21 12 13 3 9 12 31 20 7 17 3 37 12 11 , L. r. 424 and Tafira. and by Gardner (1960) from Maspalomas. Be- Kotonecudae sides our three records in Table 3, we also collected it at CW- iVoronecra canariensis Kirkaldy, 1897 Ca (G T) rizal 2 and Tirajana in 1995. Baena 8: Báez (1990) gaw records frorn Moya and ‘Tejeda Crocorhemis ecrhraea (Brullé. 1832) bfe frorn the early 19SO’iies. Bcsides heseven localities listed in Valle (1935.1955) recorded this species from Moya and Al- Table 3, we found it aibu ar :Hondo de Abajo, Hornos, acd dea San Xicolás, and it was later recorded from hfaspalornas Soria 3. by Gardner (1960) and Fe!le (1952). Báet (unpubl.) recor- Anisops debilis cacírriensis (Soualhitr. 1593) Af (Ca) ded ir fron eight addition-i sitss between 1976 and 1956. We collccted ir at : Caniza1 1-7. Siberio. Soria 3, and Tejeda. The only publijhcd record ue haw seen ij from Aldea San Xicoláj in 1949 (Lindberg 1953). S~mperri 4.5. Coleoptera This species was fust found in Gran Canaria at Teror in 1935 Gyrinidae and at Anenara in 1957 (Machado 1987b). More recently. Balke et al. 11990) found ir in seeping water 2km W Ayacata Gyinus dejeani Brullé. 1832 Me and at Pico de las Xieves at altitudes of 1200-1700m (Balkc Uellaston (18G) gave a record from Azpineguin. and more et rl. 1930). Our only specimcn was found at ?4oya in 1991, recently Balkc et al. (1990) added records froni six localities. at 290 m asl. Besides the eight localities phen in Table 3, we found it also HJdroporiis errccs Shaq, 1882 Ca (G H LP T) at Carrizai 2. This species ij ve:y common in Gran Canaria. Machado Gyrinits urinator Illiger, 1807 bc'p (1987bj listed eight localities where it had becn found bct- This species was recorded from Gran Canaria slready by ween 1950 and 1984. and Balk- eral. (1990) added ten more U'ollastc: :1861). Six more recent records ñe:e added by recent records. Besides the ninc iocaiities iijted in Table 3, Balke et al. (1990). Besides the wo localities given in Table we found it also at Hondo de Abajo. Hornos, and Mina 1. 3, we found ir also at Soria 3. Hydroporus brrcsi Reiche. 1556 hle Aulonogyrus striatus (Fabricius. 1792) hlc Machado (1987b) listed this species from Las Lagunetas, Wollaston (1 864) recorded chis species from El Charco at San Banolomé and Teror 1971-1973. Bake et al. (1990) ga- hfaspalomas, where it was «tolerably common ... though so- ve a more recent record from the last locality. \Ve did not fmd mewhat local». As it has never again been found in Gran Ca- it in Gran Canaria. naria, it is seemingly cxtinct on this island. Gruproúyes delectus (H'ollaston, 1864) Ca (T) Haliplidae The oldest Gran Canarian record of this species is from 1927 in Bco. Azuaje (Machado 1987b). During the 8Oties it was Haliplus lineatocollis (Marsham, 1802) WP found at eight additional localities (Machado 1987b. Baike et First recorded frorn Gran Canaria at El Monte in 1858 by al. 1990). We can add the following localities : Moya, Sibe- Wollaston (1864). More recenciy Bake et al. (1990) recorded no, Soria 2-3. and Tejeda. it frorn eight additional localities. Besides the seven locaiities Stictonectrs canariensis Machado, 1987 GC listed in Table 3, we found it also at Hondo de Abajo and So- ria 3. In Gran Canaria. this species was fust collected at Teror in 1971 (Machado 1987b). Nine more recent records were lis- Dyt isc idae ted by Machado (1987b) and Balke et al. (1990). Besides the Bidessus minutissimus (Germar, 1821) WP six localities listed in Table 3, we can add also Soria 3. The Wollaston (1861) recorded this species from El Monte in larva of this species was recently described by Aiarie & Nils- 1858. It was later collected at Tejeda in 1949 and Bco. del son (1997). Sauce in 1957 (Machado 1987b). More recently Baike et al. Nebrioporus canariensis (Bedel, 1881) Ca (G H LP T) (1990) collected it in stream pools in Bco. de Tirajana at According to Wollaston (1861; as tersellatus) this was once lOOOm asl. We found it still abundant in the same pools, and «An abundant insect in nearly al1 the streams of Gran Cana- added also records from Azuaje, Siberio, Soria 2, and Tejeda. y.More recent records are, however, quite few. Machado HJgroriu conj7itens (Fabricius. 1787) N'P (1987b) recorded it from San Bmolornc in 1955 and Azuaje in 1963. It \vas refound at the former locality by Balke et al. This species was collected at hlaspalomas in 1950 and in (1990). Al1 our records are from 1994, when we found it at three more ponds oí reservoirs in the mid 1980'ties (blacha- Cernicalos, Mina 3 and Soria 3 (Tables 3-4). do 1987b). Baike et al. (1990) added a record from Timara- Agnbus bigurratus I Olivier, 1795) WP ccite, Piletas. The absence of this species from our samples is probably due to its preference for larger ponds; u. habitat not Wollaston (1864) recorded chis species from El Monte in sampled by us. 1858. Machado (1987b) added eight records from the 1st 50 years, and Balke et al. (1990) could add 11 more gecent ones. Herophydrus musicus (Klug, 1833) hle Besides the seven localities listed in Table 3. we can add al- This species was recorded from Gran Canaria already by so Gañanías. Hondo de Abajo. Hornos. hfina 1. and Soria 3. LVollaston (1864). Later, Machado (1987b) could add four .-\gnbiis coqwr5us í'ifarsham. 1503) i\T localities and Balke et al. (1990) three. We collected it at Azuaje and Moya in 1991. Rfachado (1987b) confirmed the old Lindberp records of this species frorn hlaspalomas in 1950 and Valle de Tejeda in H!pliyfrrts mncirlarus Babington. 1 S-! 1 Af 1949. As no more récent records are known it might well be Thk species was collected at Azuaje and Santa Bripida in considered extinc! frorn Gran Canaria. 'ihe absence of this 1917, and more recently in Bco. de Fataga in 1973 (hfacha- species in o& sarnples rnay also have been caused by the fact do 1YY7b: as H. crnssus). hlon recentlj ir uas found also in that we did not sample any lou-alritude ponds. Bco. de Tirajma nex San Banolorné (Balkc et al. 1990). Our Agnbiis nebulosru (Forster. 177 1) iVP onl? specirnens were found in stream pools at híoja in 1994. In Gran Canaria. chis species was first recorded from Tafira H~cJ-oinrs!rspilosus Guiznor. 1945 Ca fTt by \vollaston I 1864). Sixreen mor? rercnr rwordq tv2re given .. . 1. 426 STREAXl IXSECTS A\’D GASTROPODS IS GRAS CAVARI.4 by (Machado 19S7b) and (Balke et al. 1990). Besides the Hdraena serricolfis Wollaston. 1864 Ca (GLP T) four localities listed in Table 3. we found it also at Hondo de This is seemingly a mespecies in Gran Canaria. It was rc- Abajo. Hornos, and Sona 3. corded from Bto. de Tirajana at San Bartolomé by Balke et iCIelnderna coriacea Lapon:. 1835 lk a!. ( 1990). we collccted it at the same locality, and also at Guiyadeque 2nd Sikric. U*olIajton (1864) recorded ihij Speckj from El Charco in Maspa!omas. Machado ( 19Sib) added rttorcij fron Tejeda ~imnebi;iscnr:cirieri:is arcn:.morit. i435 GC in 1973 and 1951, and Balke et al. (1990) pve mi- .xnt This r3re si i:j ¡j endemi.: tn Crin Canaiia. The holotype records from Artenara. San Bmolomt. La Cui~ai .eror. \v3s collest. 3t 1000ni as1 in B:o. de Tirajana (Orchymont Besides thc five localities given in Taable 7. wt f, -;d this 1940). J3ch t 1993) recorded a second male from [he same species at Hocdo de Abajo, and Soria 7. valiey 31 1200m ajf. colltctcd in 19S9. Nk collected a single ma!e at Soria Z in 1994. Lnccophilris hyalinus (De Geer, 1774j WP Limnebiris grncilipes Wollaston, 1864 Ca (GLP T) Wollaston (1864) kneu three Gran Canarian localities for chis species. Machado ( 19S7b) addcd three récords spanning \Vollaston !!864) described this species from a strearn at . from 1949 to 1973, and Balke et al. (1990) gave five more re- Xlogan in Gran Canaria. Orchyrnont (1 940) listed thrce addi- cent records. N’e found it abundant at Xzuaje. híoya and Te- tional localities, and Jach í 1993) gave four more sites in his rcvision of chis genus. collected this species at the follo- jeda (Table and present also at Coruiia. Sikrio, and Soria Wé 3). wing seven localities : Cernicalos, Coruña. Hondo de Abajo. 3. Siberio. Soria 7. Tejeda and Tirajana (Taabj 3-4). Ereres sricricus (Linnaeus, 17%) Co Hydrochidae This species was collected in El Charco at hlaspalomas first ifpfrochtcsgrandicollis Kiesenwetter. 1870 Me in 1858 (Wollaston 1864). and most recently in 1950 @¶a- Balke et al. (1990) found chis species in pools at La Culata. chado 1987b). Most probably it is now extinct in Gran Cana- \Ve collected it at the following five localities :Mina 3, Sibe- na. no. Sona 2-3. and Tejeda fiables 3-4). Cybister tripuncturus (Olivier. 1795) Af Hydrophilidae Wollaston (1864) knew this species from Arguineguin. whe- Coelosroma hispanicurn (Küster, 1838) Me re in 1858 he found it «in the pools, or small freshwater This species was first reponed from Gran Canaria by Wol- lakes. close to the sea» . It was later recordcd from Aldea San laston ( 1564: as C. orbicirlare). Orchymont (1940) and Bal- Kicolds in 1949 and from blaspalomas in 1950 (Machado ke et al. (1990) each addcd two more locatities. ii’e found it 19S7b). and more recently from Tamaraceite at Piletas (Bd- at Azuaje. Siberio and Tejeda. ke et al. 1990). \Ve have not obscrved it in Gran Canaria; most probably because we did not sample any low-altitude Chnerunhriu similis Wollaston, 1864 WP ponds. Wollaston (1864) knzw this species from El Monte in Gran Hydraenidae Canaria, and Orchymont (1930) latcr found it in Bco. Azua- je. hlore recently. Balke et al. (1990) recorded it frorn San Ochrhebiris lupidicoin \Vollajton. 1864 Ca (G H LP T) BanolomC and Teror. We found it only at Tejeda in 1991. Orchymont (1940) found thij specicj in Xzuajé at lOOm as1 Ln~-co¿ii - .-. A.X. SILSSOS. B. hlALhfQVIST. hl. B&Z. J.H. BL..\CKBLR\;, P.D. AíLWTAGE 427 Helochares fividus (Forster. 177!) WP O.~erhirafaicatablonon. 1893 WP Bdke et al. (1990) listed this species fron seven localities in Our liyhi traps coliected one msk of L!is speciej at Azuaje Gran Canaria. u'e collected it a: the foi!ou-ing seven iocaii- or. 3 1 hlxch 1994 ar.a one female a: Tirajana on 2 January :ics : ?.zuaje. hloya. Sibeiio. Soria 2-3. Te-ieC3. 2nd Tirajana !995. Son? or r!l ci'the iz~airecords @:.er: above may-refcr ITritiiCS 3-4). i'b triii SpeCiej. 5iocRn;s poiiriis íKüst-r. LSS?hft 5:r;~r:hl~f.q.iS:;kon. 1948 GC TSij species ;vas firsi recorled frorn G:XI Canaria by Wol- Thij SFCiCS .*as describcd frorn thrte males collected at a laston ( I56-l: as PhilhJdriis mefa~~ocephalitsj.Later. Orchy- ampc!ib nez Las Lagunetas ar SOOm as! in 1931 (Xybom mont [ 1940) aclded rkee more bcz!kics. Lloie iectnt!?. Bid- 19-13). The specirnens collcctd by Eator. :t Teror in 1880 kc e[ zi. fi99Oj forind i: onii P; Tzror. iistd 5y Xl;iai.n!an (1883) 2s S. $:iramzy belong to this or - Enociiriis oicoior (Fzbricius. 1741) WP rhe nes: spxics. Tic oniy Gran Cnc2rian recmd of this species irppeass to be jiliCi<:biasrorni Nybom. 1918 CL (G LP Tl th: of Ctrchymont í 1940) fron Maspalomos. \Ve coikied S:acrobia Iarv-vne at Guayodcque both in 1994 Dpopida: 2nd 1995. Ttz only adult we fouad there was identified as S. srorai. rhough some minor deviations frorn material from Te- D~opsgracik Karsch, 1881 bíe nerife indicate that more specimens are needed for cenain This spxies was first iisted from Gran Canriris hy Wollaston i8en;ification íhlalicky, in fitr.). asproíi/eratusJ.Balbe et al. (1990) found ir at al1 theK (181%: Psyc homyiidae localities on rhis island. and it wís present also a: the great majority of our localities (Tables 3-3). Tinodes canunemis McLachlan. 1853 Ca (G LP T) Scinidae niis species was first described from specimens collected by Eaton at San klateo in 1880 (McLachian 1883). Later, Ny- Cyhon graciíicomis Wollaston; 1864 Ca (G T) bom ( 1948) added a record from Las Lagunetas at 8OOm asl. This species was first described from El Monte in Gran Ca- We collected two males and four females in a light trap at naria. Ir is absent from our material. Mina 2 on 19 November 1995. Moreover. one male pupa col- lected at Guayadeque together with larvae was identified as 4.6. Trichoptera 7: canariensis. The larvae collected ar Gaiianías may belong Glossosomatidae to this or to the next species. Agnpetw adejensis Enderlein. 1929 Ca (G LP T) linodes arcuata Nybom. 1948 GC The only published record of this spesies from Gran Canaria This species was descnbed from a single maie coiiected at a is that of Nybom (194s) from Las Lagunetas at 8001x1 asl. mountair. at Las Lagunetas in 1931 (Nybom 1948). . brook Larvae of this species were relatively common at Cernicaios. IVe know of no substquent records. and found nowhere else. Polycentropodidae Hydroptilidae Po1pvwoprc.s sp. Hydroptila fortunatn Monon, iS93 bla Larvae belonging to this genus were coiiccted at Tirajnna in Syborn í 1948) listed Eaton's old records oi rhis spccies from 1994 ana ai Siberio in 1995. hlost likely tnty belong to the San h!ateo and Teror, and addcd also a newer one frorn Las same. still unidenufied. species as the larvae collected in Te- Lagunetns ar 800m asl. W'e colleeted adults of this spccies in nenfe (hlalmqvist etd. 1995). our light traps at Azuaje, Mina 2 and Tirajana, and found al- H ydros ychidae so some adults ar Moya and Soria 3. Besides the seven Ioca- lities listed in Table 3, wc found larvae also at Carrizai 1-3 HJdrop-che mderensis Hagen, 1865 Ma and Soria 3. Nyborn í 1935) reponed on three males of this species collec- Orriiorrickia angustella hlclachlan. 1565 Me tcd at Las Laguneras in 1931. We know of no subsequent re- Coids of this othenvise hladeiran species. Adultj of both sexes of this species were coliected in our light traps at Azuaje both in 199-1and 1995. Btsides at Azua- Hydropnche rnnroccana Navas. 1935 Af jr. Imae were also found at Carrizsl 2 in 1995. Our records This spccies was recorded from a srnali stream at Las Lagu- xe seemin,oly the first ones frorn Gran Canaria. netas by h'ybom (194 : as H. /lava). \Ve collected adulu in our light trnps a: Azuaje nnd Tirajana in 1995. Larvae of rhis 0.qorhirn spinosella hlelachlan. 1883 bla gnus bkere abundant at Cemicalos and hfina 2. and present Thr only published Gran Canarian record of this species is nlso at Azuaje. hfina 3. and in a canal at Brezal. thofxybom (19-15). record is, however, arnbiguous lhis as Limncphilidae the given locality ((Hermigua. Barrancos» is siruatcd in La Gornera. b'e collectcd one male in a light trap at Tirajana in Mesophylnr nspersrrs Rambur. 1S-12 WP 1995. 0.yverkira larvae were found at Azusje, Carrizal 2. This spccies waj firsr coliected in Gran Canaria at San blateo !*10:;3. 2nd Sibeno (Tablss 3-4). by E2ti;íi in lSS0 ihlclachlan 18S3). Later. Kyboiri (1954) 428 STREA\! CsSECTS AXD GASTROPODS IS GRXY CASUZIA t gavc records from Tarnadabe in 1939 and Cruz d-. Tejeda in iordtd Clogniin albipuncrata and Tinearia alternara from 1950. 1% collected aJults in ligh: traps a; Mina 2. Sona 1 Gran Cmuia. Dut the other species on our list are terc see- .md Tirajmr?. Lmae uex abundxt a; se:erd of the locali- nin$y rtcordtd frcn the island for he frst time.] ties iisted in Tabie 3. and present also at Ga5aníaj. Guaya- Sa:chelÍie!ln binuncioiatu I Satchell. 1955) Ca (LP T) &$K. í!cfi$:, 2: i'j.?izj~. ¡-!amos. hfix i. a2-j 5:ri: i LFF:ocr.C<::í: Ozceiir csncriznsis Biaiiei. i990 Ca ;?! This spccies W~Sfirs; described from Bto. de los Chorros, Su!chelíieílu reneryensis (Satchell. 1955) Ca (LP T) abo.;e San biateo. a; 790m ajl in lS90 iBralití 1901). LL'? ii'e cc.ilcc;ed on: hni zt Azcaje 5r.d tu'o at Mina 3 in 1991. kr,i.ow of cj s1jixeqrier.t recorííi fiom Grar: Ca:izria. 3.7. Di?ter& !.imerkii&e [The t;mrment of thic f3mily chicfly foiioivs -it..eowald íi977) and Joq < 19871.1 .Adnlrs olthis spccics were collecred iii the light trap at Azua- 1tT Dicranoniyia chorea (Meigtn, 1818) je in 1994 and 1995. Tt.is speiies waj firj: reponed frorn Gr-n Canxia by Lack- schewitz 1936), who liste¿ it fiüm P stream at Lss Lagune- ras. Later. Hemmingsen et al. (1959) added Bco. Bandama. Two males of this species wece collected in the light trap at Los Laureles. and Valle Angosrura. Wc collected adults in our .\zuaje in 1995. iight traps at huaje and Mina 2. Larvae of this genus were Ppchodu sp. found at four of the localitics in Table 3. and dso at Brezal, Gañm'as. Guayadeque, Hondo de Abajo. and Mina 1. An unidentified Psychodu species was collected in the light trap at Azuaje in 1995, and also huid-collected at Guaya- Dicranomyiu humata Becker. 1908 Me deque in 1991. Hemmingsen et al. (1959) found species at seven locali- this Enearia akernata (Say, 1821) CO ties in Gran Canaria. It was not found in our samplcs. Dicranomyiu intermedia Santos. 1923 Ca T LP) Xdults of this species were collected in light traps at Aruaje (G and Mina 2. \Ve collecred adults of chis specics in our light traps at Azua- je, Mina 2, and Tirajana in 1995. It was recorded from Gran Tinearia lativentris (Berdtn. 1952) Me Canaria by nieowald (1977). This species was found only in the lizht trap at Azuaje in Dicrunornyia vicina (Macquan, 1838) Ma 1995. This species was first recorded from Gran Canaria by Lack- Pirilosepedon sp. humeralis-gr. sshervitz 11936: as cannriensis) from a stre3.m a: Las Lagu- Single specimens olthis species we:e found in the light trap 11335.Later. Hedngjen et a!. (1959: zi co::arier:sis)recor- 31 Azua-ie in 1991 and 1995. ded it irsm Eco. Bandama. Bco. los Gatos ami Bco. 1~ Hi- Dixidx pera. \se coliected adults of tb.is spccies at Azu3jz. hlina 1- 2. Sona 1. and Tirajani. Dirn tmica Peus. 1931 Cs íG LP f) [Geranorn.viuarlnnrica nnndirnsrris Pierre. 19 18 Bía Besides the eioht locaiiries listed in Tiible 3. we found lwae Lackschewitz (1936; as cabrerae) gave a record of tlus spz- oi this speci :, also at Gañanías. Guayadeque. Hondo de cies from a pool neu [he sea ar heno dc la Luz. Tke habitat Abajo, Hornos. and Sona 3. \Ve are not aware of any prc- may thus not be strictly limnic.] viously publishcd records from Gran Canaria. c Gcrnnom.via cunariensis Bergroth, 18S9 &la CuliciCx Lackschenitz [ 1936: as niocitlipennis) reporeii tiiis species The mosquito fauna of the Can- Islands was reviewed by frvm Las Laguneras. \Ve know oi no subjequent records B6ez and Fernandez ( 19SO). Eight speciej are known from from Gran Canaria. Gran Canana. \Ve have collected only occasional adults, and I.mac of the genera Anopheles. Culisern. and Cule.r werc [Grranonpiri unicolor (Haliday, 1533) Ca íL T) faund ir. sorne of [he sueams (Tablcs 3). Lackschewitz (1936: új irrrrbrnticn) gave a record of this spe- ciej from a pool ncir the sea at P~ertode la Luz. The habitat Thamaieidae rnsy thus not be stnctly limnic.1 Tiiartmnfcn subafricana (Becker. 190s) Ca (L? T; Psyc hodidae Stori [ 1936) recorded this species from a wet rock near a wa- [.as older records of this famil? from Gran Canaria have not terfall at Las Lagunetas. We collected lmae ac Guayadeque. t.;.cn rcviscd. tvc lis! OII!:~wr ov;n ones. Tonnoir i 1921) re- Hondo de Abajrio. and hfina 7. , ,#_ , I fi\ - (17) A.S. SILSSOS. B. XIALMQVIST,M. B&Z. J.H. BLACWRY. P.D. AUIITAGE 429 Simuliidae P rocladiiis choreiis ficleigen. 1804) Af & ibT [The earlier records of this farnily irorn Gran Canaria were Adults of this species wcre collected in light traps at Azuaje, revised by Crosskey (19SS).] %fina 2 and Tirajana. Lame were found at Mina 3. iMoya. Sinzdiiim giiimari Becker. 1908 Ca íLP T) Siberio. and Soria 3. This species \vas collected at Las Lagunetas in 3931. We Thienernannimjia sp. found Ianae abundant at Cernicalos and ,\ha 2. They were Larvae belonging to this puswere only found at Cernica- also present at Gritianías. Guayadcque. hlina 1 8: 3. and los and Tirajana (Table 3). h10ya (Tabléj 3-41. Trissopelopiii ?florida ffieffer. 1913) \VP Simiiliiim inrerniel?iiini Kuubaud. 1906 WP Lwac probably ieprescn:Ing thij species were only found at This species was collected at Las Layxetas and Tafira in Soria 2 (i’abie 3). 1931. Besides at the eight localities listed in Table 3, we Znvrelimpk barbcripes (KieHer. 191 1) WP found this species also at Brezal, Gañanías, Hondo de Abajo, Hornos. Mina 1, and Soria 3 (Table 4). Adults of chis species were collected in the lieht traps at Sitnirliiini paraloiiierense Crosskey. 19S8 GC Azuaje and Tirajana in 1995. Besidcs the srven localities gi- ven in Table 3, lwae occuned also at Hondo de Abajo, Hor- This species was collected at Las Lagunetas in 1931. and la- nos, and Soria 3. ter Crosskey (19SS) suggested that it had became extinct. We found Isriae and pupae at Guayadeque both in 1991 and Onhocl adiinac 1995. Bpophaenocladiiis ciineijonnis Annitage, 1957 Ca (T) Simiiliiirn pseiideqiiinurn Séguy, 192 1 UT This species was previously known only frorn Tenerifc. We Previous records of this species frorn Gran Canaria include collected one specimen in a light trap at Tirajana in Novem- one without more detailed locality from 1890. Bco. Guini- ber 1995. cuada and Tafka 1903. and Las Lagunetas. Las Palmas and Cardiocladius sp. Tafira 1931. We found the larvae of this species abundantly Larvae reprcsenting an unidentified species of this genus wc- at Azuaje in 1994. They were seemingly not prcsent therc in re found at Cemicaios and Mina 2 in 1995. 1995. and not found at any other of our locaiities. Chaetociadiiis sp. Sirniiliurn nrficome Macquart, 1838 Af Lame representing an unidentified species of this genus we- This species was collected at Moya in 1931. We found it re found at Gañanias and Mina 3 in 1991. abundantly at Azuaje in both years, at Moya in 1994, and at Tejeda in 1995. Occasional specirnens were found also at Copnoneiira ?lobata Edwards, 1924 FVP Brezal. Caniza1 1-2, and Siberio. Adults of this species werc collected in the light trap at Mina Ceratopogonidae 2 in 1995. Larvae of this genus wcre found at Corutia and Mina 2-3 (Table 3). As our limited material of this family has not been identified to specics and no recent revision is available we have refrai- Cricoropiis (Cricotopiis) rriannulatics (Macquart, 1826) WP ned frorn dealing with this family. Larvae or pupat were Adults of chis spe;ies uere found only on the wet rock at the found 3t five of our localities (Tables 3-4). Periz darn. C hironornidac Cricoropits (Cricoropiis) vizrriensis Goetghebuer, 1935 WP [As rnost of the older records of this family frorn Gran Cana- Adults of this species were collected in the light traps at ria have not been revised. \ve list only our own ones. Distn- Xzuaje and Tirajana in h’ovember 1995. bution codcs refer to the geographic area frorn which most Cricoropiis (Isocladiics) sp. records originate.] Tanypodinae Adults of this unidentified species were collected in’he light traps at Azuaje and Mina 2 in 1995. Lame of the same sub- Ablnbesrnyia ditsoleili Goéthghebuer. 1935 Af genus occurred only at Soria 3. Adults of this species were collected in light traps at Azuaje Eiikiefferiella brevicalcar (Kieffer, 19 1 1) clnripennis and Tirajjana. Besides the six localities given in Table 3, lar- or iae icere also found at Carrizal2. (Lundbeck 1S9S) iLP Macropelopin nebiilom (Meigen. 1SM) \CT Adults of onc of these two species were found in the light trip at hlina 7 and Soria 1. Lwae assigned to this species- Lmae of this species were found at Corufia and Tejeds. hfo- pair werc found at Hondo de Abajo. Soria 1 and Tzjeda. re Iwae of this genus. not identified to species. occurred at Hondo de Abajo. Hornos. hfina 3. Soria 2, and Tirajana. Eiikkfi~ridahor fEduuds. 1979) WP Paramerino ciqii1a:a (Walker. 1 S56) WP Besides at the five localities given in Table 3. Imae of this species were also found at Gañanías and Hondo de Abajo. Adults of this species were collectcd in light traps at Azuaje and Tirajana. Lmac ucre found at thc fivc localities siven in Eirkiqferielia sp. N ilklqensis (Edwards. 1979) iF’P T3bis 3. La?:.: rt’his species u‘erz found only at Ama$ and Mina 2. STREPAl ISSECTS A\D GASTROPODS K GRXY CAS.ARI.4 (18) Heterotrissoclndius s p. Dicrotendipes septemmaciilariis (Becker. 1908) Af & WP Larvae representing an unidentified speciej of this genus we- Adrilts of chis species were collectcd in the light traps at re found only at Sona 1 (Table 3). Azuaje and Tirajana in h'ovember 1995. Larvae of this pus Limnophjes sp. u sre fxnd at Carrkz! 1 and Sibeno. Adults of one or more unidentified species of thij genus we- Phnenopsecrrn sp. re found in light traps at Azuaje. Mina 2, and Tirajana. and Besides at the threc localities ghen in Table 3. larvae of this hand-collected at Soria 3. Larvae were found only at Mina 3 penus were founii also at Brézal. and híoya (Table 3). Pol.ipeOiliim (Petnzpedilitm) sp. nr sordens (van der N'ulp. Orrhoclndiris (Eudac~loc1ndiiis)fiiscimaniis(Kieffer. 1908) 1571) UP WP The adult rnzterid Licluded probably at leasi five different spe- Our light traps collected at least six unidentified species be- cies ofthis pus,of which only one could k asscciated with a longing to this genus. Besides at the three localities given in spxies namc. Lanac of the penus were found oniy at Moya. Table 3. larvae of this species were found also at Hornos. Siicrochironomiis sp. N maculipennis íhleigen. 1818) WP Orrhocladiiis (Euorthocladius) rivicola Kieffer, 1911 N'P Adults of thjs species were collected in the light traps at Ti- Besides at the six localities given in Table 3, larvae of this rajana in boch 1991 and 1995. Larvae of this genus were species werc found also at Hondo de Abajo, Hornos, and So- found only at Tejeda. ria 3. Tanytarsini Onhocladius (Onhocladius)pedestris (Kieffer, 1909) WP Cludotanyarsus ?atridorsum Kieffer. 1924 WP Larvae identified as O. pedertris occurred at heseven loca- Adults probably belonging to this species were collected in lities given in Table 3, plus Hondo de Abajo, Hornos, Peréz the iight trap at Azuaje in 1995. Larvae of this genus occur- dan. and Soria 3. red at Mina 3, Moya and Soria 3. Parumetriocnemw sfyhfus(Kieffer. 1924) NT hficropscctra atrofasciata (Kieffer. 1911) Af & WP Adults of this species were found only at Azuaje in 1994. but Adults of this species wen taken in thc light traps at Mina 2 in 1995 they were found also at Carrizal2, Guayadequc. Mi- and Soria 1. Larvae belonging to this genus were very abun- na 2, and Tirajana. Besides at the seven localities given in dant at Mina 3. and found also at Coruña. Hondo de Abajo, Tab. 3, larvae of this species were found also at Carrizal 1-2. Hornos, and Periz dam. A few pupae from Mina 3 were and Hondo de Abajo. identified as this species. Paratrichocladius mjvcntris (Meigen, 1830) WP Micropsecrra ?notescens (Walker. 1856) WP Adults of this species occumd in the 1994 adult samples A pupa from Hornos probably represents this species. from Azuaje, Sona 3, Tejeda, and Tirajana. Larvae probably Rheotanytarsus sp. representing mfventris plus one unidentified species occur- Larvae of occurred at Azuaje, Carrizal 1-2. Cerni- red at eight of the localities given in Table 3. plus at Brezal, this genus calos. Guayadeque. Sibeno, and Tejeda (Tables 3-4). Hondo de Abajo, Hornos. Soria 3. Tm>ramu chinynsis Goeyhebuer. 1934 L\T Psecrrocladius sp. Adults of thij species were collected in the light traps at Larvae belonging to genus were found at Carrizal 1, Si- this Azuaje and Tirajana in 1995. Larvae belonging to this genus berio and Soria 3. were found only at Moya (iable 3). Rheocricoropiis (Psifocricotopus)arripes (Kie ffer. 1913) i'irgaranytarsus afbisutus(Santos Abreu. 1918) Af IlP Adults of this species were collected in the light traps ar Besides at the four localities given in Table 3, larvae of this Azuaje and Tirajana in November 1995. Larvae belonging to species were found also at Brezal. this genus were fsuid at Azuaje and Carriz'ai 1-2. Thienemannielfasp. N cfavicornis (Iiieffer. 1911) WP Srratiomr idae Besides at the seven localities given in Table 3, Iarvae of this 0.pcera grancanariensis Frey. 1936 Ca (LP T) specie: 9:ere found also at Guayadeque. Hondo de Abajo, This species was first described from a stream near Las La- and Hornos. eunetas at lOOOm as1 (Frey 1936). More recently, (Rorkosn! Chironominaz k Báéz 1953) pave a record from Azdaje 1973. U'e collected Chironomini larvae of this species at kruaje, Cemicalos, Guayadeque. and Mina 3. Chironomw sp. Empididae Our light traps collecred at least four unidcntified species be- longing to this genus. Besides at the five localities given in Chocera amaranrhn Becker, 190s Ca (LP T) TsSk 3, of this genus uere found also at Chzd 1. Frey (1936) recorded this species frorn Las Lagunctas and Coruña, hornos, anci Sona 3. Xlc 2 ?\'c. U~OHofns su0xouz:ir rxd,froin G;an Can~j? (19) X.N. NLSSOX. B. hl;\LXIQVIST. hl. B&Z. J.H. BLACKBUKY. P.D. AR..lITAGE 43 1 Hemerodromia cfaripennis Frey. 1958 Ca (LP T) Table 5. Summationj of individuals and species frorn srandudized ncr samplcs taken in Gran Canuian screams. Spccics collecred in Lmae oí pupae of chis species were found at Comiia. Mina qualitative sarnplcs from the same localiries wcre includcd in onc 3. and Sona 2. It was seemingly not known frorn Gran Cana- of the spciej counrs. Divcrsity is given as Fisher's a. ria exiier. Tablcau 5. Totaux dcj individus et cspkes partir de ricoltcs au fi- Dolic hopodidx Ict standard dans Ici cours d'cau de Gran Canuia. Les es#ces rC- Cnidentified lanae belonging to thij farnily were found at colties dan5 des préikvernenu qualitatifs sur les mimes sitcs sont cornptabiiish dan5 un iotil dcj c~pkce~.La diversiti spicifique de Abajo and Son3 2. Hondo cjt donni? sclw ü de Fishcr. Ephydndae Adultj of the following two species were prcsent in our light No. 01 spscies tiaps : EphJdra macellarin E,oger, 1861, at Azuaje in 1995, Localily No. 01 inds Oual. crcl Oual. incl Fisher's a and Scarella stagnalis (Fallén. 1813) at Tuajana in Kovern- ber 1995. kuaje94 70 1 20 44 5.670 Fluscidae kuaje95 544 25 27 5.411 The aquatic forms of chis family belong to thc tnbe Limno- Cernicalos94 1025 24 32 4.399 phonni. of which the Canarian species were revised by Báez Cernicalos95 554 27 25 5.939 (19s 1). We here iist only the species with supposediy aquatic coruaa94 1369 28 35 4.903 Isrvae. Our own material of larvae and pupae has noi been Mina 2 350 15 10 3.106 identified to species. Mina 3 1306 36 40 6.850 Limnophora quaterna (Loew, 1852) Af Moya94 404 36 46 9.555 This species was recorded frorn Gran Canaria by Becker Siberio 197 19 47 5.187 (190s). Soria 1 77 11 12 3.512 Soria 2 52 1 22 35 4.654 Limnophora obsignata (Rondani. 1866) Me Tejeda94 297 35 48 10.310 species was recorded from Canaria by Frey accor- This Gran Tejeda95 092 20 20 5.495 ding to Báez (1981). Tiraiana94 617 30 35 6.595 Limnophora setinema Schnabl & Driedzicki. 19 11 Me Frey (1936) recorded chis species frorn Las Laguneras. Limnophora beckeri (Stein. 1908) Pal Using Fisher's a (Magurran 1988) calculated from the semiquantitative net samples as a diversity estima- This species was recorded from Gran Canaria by Frey accor- two ding to Báez (1981). te, Tejeda 1994 and Moya stand out as the most di- verse locaiities (Table 5). Limnophora bipunctuta (Stein, 1908) Me This species Uas collected at Azuaje in 1973 (Báez 1981). It is more difficult to evaluate the different number of species collected at the visits when only non-stan- íimnophora niridirhornr (Stein, 190s) C (LP T) dardized collecting methods were used (Table 4), as Thij specicj was collectcd 3: Azuaje in 1973 (Báez 1951). the results 3re highly dependent on the investigation effort. Hoivever. the two richest sites were apparently 5. Local diversity and similaritv Soria 7 in 1991 and Hondo de Abajo with 37 and 31 In total. our benthic samples from Gran Canaria in- taxa respectively. cluded 123 taxa of limnic insects and gastropods. Of Looking at the distribution of the individual taxa these, 9s taxa were represented in the semiquantitative among the studied streams. no nested pattqn was net samples, including almost 9,000 identified speci- found (Patterson ¿tAtmar 1986; RANDOM 1 test). mens. Looking at these samples only, local species Such ;1 patrern would not be expectcd as the richest richness ranged from 11 to 36 species. with Tejeda stream harboured only 39% of the total number of taxa 1994, Moya and hlina 3 being the richest localities found. (Tablz 5). As these values are based on pooled data Faunal similarities among the localities where serni- from riftle and pool samples, that from Siberio'is un- quantitative net samples were taken ivere estimated by derestimated due to the absence of riffle samples Irom üPGh1.4 clustering. b'hen based only on these quanti- this locality. LVhen the spccies found only in mn-stan- tative data. sime of the sites clustered at relatively high dardized collections at the same sites are added. Teje- similarities (Fig. 2.4) uith Cernicalos 1993, hlina 2, da 1991 stands out with 48, followed by Siberio with Aloya. Siberio. Soria 1-3, and Tirajana making up one 47. Aloya tvith 46. and Azuaje 1991 with 44 species cluster. hiojt disparate in this analysis tvere Coruña, iTnbic. 5). Ccini~3!0~1994. ar~dhlina 3. STXEA\l ISSECTS kh;D GXSTROPODS IS GRXS CXXARIX Similarities between localities were much lower and Anncnetin hoemorrhoa are confined to streams. tvhen the analysis was based on presencelabsence data The nurnber of records of Trichoptera species from and also the results of the non-standardized sampling Gran Canaria is relatively lou. IVe found ten of the 14 \vos included (Fig. 2B). Hcre Soria 2 clustered with Ti- .specie ~ernicaios95} 1 Mina 2 Siberio Sorio 1 j-li Tejeda94 J Moya Mina3 I Cemicalos94 L Coniiia . Coruaa Sorio 2 Tirajana Tejeda94 Siberio Mina 3 * Moya 6 (0link'Drnax)'l O0 Fip. 2.4-B. Similvity of strearn localities in Gran Canana based on their gajtropod and inscct faunas as denved from L'PG.\l.\ clustering. -.\. Baseu on quantiiativc data including 93 tan-B. B3jed on presenceiabsence data of I I-I txa. Lisits from diferent ycars rreated as separate cases. Fiq. 2.4-8. Affiniri coenotiquc des sites de Gnn Canaria fondic sur leurs faunes d'insectes et de gastémpodes par- tir d'une CPGhí.4 cluster analyse -.\. Basic sur les donnies qumtititivej de 9s tila -B.BssCe sur Ics donnics prC- ssncchhsence de I 1-1 tAy;3 Les rko!iej 1.j diffirenicj annPes son[ tiiiiPej s$pnr:mz>: 43.1 STREA\l SSECTS iWD GASTROPODS IS GRX?CXYARI.I\ jent frorn Gran Canaria. On the other hand. 13 of the Balkc SI.. Hendnch L. C% Cuppen I. G. hI. 1990.-Uásserk;ifcr von species known frorn Gran Canaria have not been found den Idas Canari~jI Coleoptcfa : Haliplidae. Dytiscidae. Gynni- dae. Hydroihidx. Hydrophilidic. Hydraenidie. Dryopidae). En- in in Tenerife. As in Tenerife. strearns Gran Canaria roitlofni(n‘i. I I : 349.37.;. jhare relative]) few speciej making .exh site unque , . .E;chxT. IW?S - Dpsren JI: Kiniri&en Injeln. .\fin. cool. Mtir. uith respect to community structure. The only speciej Barlin. 4 : I - I SO. jcemingly endemic to Gran Canaria are : Sricrotiectrs Bcllc J. 1952.- Ocionata ~dlc?cidin ihe Canq 1jl;tnds. Enr. Ber.. catinriensis. Litntiebius catiariensis. Srnctobia frqvi, i) : 7 j-:?. Braucr 1901 í 1900~- Cbcr die von Píof. Sirnon! auf den Ca- linodes arciiatiis and Simiiliiini pnraloiiterense. N’ith F. O. naren gcktndenen Scuropicra unú Pseudoneurúptera iodonata. the exception of S. canariensis al1 of then are already Corrdentia ct Ephcmcridx). Sir;b. mn;h.-nl:r. iris. Akd. \Viss.. extinc,-ui perhaps ve9 close to extinciion with small 109 1 I j : 464--!77. populations found at isolated localities. Crojskey R. H: 19SS.- Taaonorny and pcography of thc blackfliej of thc Canary Ijlandj íDiptcra : Simuliidic). 1. nor. Hisr.. 22 : Azuaje. Cemicalos, and La Mina may be the only 32i-555. three permanent strearnj now remaining in Gran Cana- Frey R. 1936.- Dic Diptcrenhuna dcr Kanuijchen Inscln und ihre na. Water may also be present permanently at other lo- Problemc. Cnmni. biol. Soc. sci. ]km.. 6 (1 1 : 1-137. calities, either as pools or small springs. Perrnanent Gardner A. E. 1960.- Odonata. Saltitona and Dictyoptcra collec- pools may exist locally due to deep basins in rock. or red by hlr. E.S.A.Bayncs in thc Can- Isbnds 1957 10 1959. En- where hypogean strearn water reaches the surface. ronioiogisr. 93 : 128- 13 l. Henuningsen A. hl.. hiannheims B. & Nielsen P. 1959.- Notes on We have earlier suessed the vulnerabiiity of the fresh- craneilics (Tipulidae) collcctcd by Dr. Axel hl. Hemmingsen in water fauna in Tenerife (Malmqvist et al. 1995). The ihe Can. Islands. Enr. bleddr. 29 : 71-77. present study shows that the situation in Gran Canaria Jkh hl. A. 1993.- Taxonomic revision of the Palcarctic speciei of thc genus fimnebius Leach, 18 IS (Colcoptcra : Hydraenidae). is no better and we think setting up and implernenting Kdropr. Rundsch.. 63 : 99-187. a conservation plan for freshwater macroinvertebntes Jonp H. de 1987.- Keys for thc identificarion of thc Tipuloidca (in- would be an urgent task. secta. Diptcra) morded for the Canary Islands. €os. 63 : 73-92. Lackschcwitz P. 1936.- Fam lipulidae. Fam. fimoniidae. p. 5-8. - Acknowledgemenis In : R. Frey (cd.). Die Dipterenfaiina der Kanarischen Inseln und Dr. Peter Langton provided taxonomic help with the ihre Problene. Comm. biol. Soc. sci. fenn. 6 (1) : 1-237. Chironomidae. and Dr. Dom Chaloner hclped us with the processing Lindberg H. 1953.- Entomologischc Ergebnisse der finnlidischen of them. Dr. Ted von Proschwitz. Gorhcnburg. kindly idcntified al1 Kanuen-Expdiuon 1917-195 1. No. 1. Hemiptera Insulanirn Ca- the gasuopods. Dr. Frank Johansson, Umck kindly idenufied our nariensium. Systematik. 6kologie und Verbreitung der Kanari- odonate larvae. Dr. Rüdiger U’agncr, Schlitz. provided hclp in the sehen Hetcropteren und Cicadinen. Comm. biol. Soc. scifenn., 14 identificarion of Empididae and Psychodidae. Dr. Hmj Maiicky, (1): 1-3W. Lunr am Sec. identified al1 our dult caddis tlies. Dr. GLIran Machado A. 19S7a.- Bibiiografia enromológica Canaria. Instituto Englund. Umea. kindly operated a light trap for one evening. Dr. de Estudios Canuíos. La Lasuna : 295p. S. Uolin. Vladivostok. providcd computcr sohare for calculating hiachado A. 19S7b.- Los Diriscidos de los Islas Canarias (Colcop- Fijher’s a and analysing nestcdncss. Dr. A. Thüñiss. Tüulouse. reril. Dxiscidtie). lnstiruto de Esradios Ca.ii&ioj.La Laguna : 8 I p. kindly prcpxed the Frcnch abjiract for us. oilalmqvisr B.. hleissh C. Nilsjon A. S. 1997.- Dislribution pat- ternj of frejhaatcr Ostracoda ICmjtaceJ! in thc Canw Islands Re ferences uiih regrirds to habitat use and biogeography. Hvdrobiol.. 3-17 : 159- 1 70. .Mane 8: Nilsson A. iv. 1997.-Lanae of Srimnecies Brinck : Y. Malmqvis: B.. Silsson A. & Biez hl. 1995.- Tcnerifc’s frcsh- Gencric characteristics. dcscription of S. connriensis Machado. iv. water macroinvcrtcbratcs : status and threats (Canay Islandj. and analysis of phylopcnctic relationships with other genera of the tribc Hydroporini (Coleoptera : Dytiscidaei. Coleoprs. Buli.. Spain). Aqiiaric Cons.. 5 : 1-24 51 : 110-139. hlalrnqvist B.. Nilsson A. N.. Biez hl.. ArmitJgC P. D. 8: Blackburn Armitagc P. D.. Blackburn J. H.. Silsson A. S. Br hlalrnqvist B. J. 1993.- Stream macroinvcnebnte communuies in the island ot‘ 1995.- Chiwtiomidtie injresh>\tvcrhnbirm irr Eiirr(fe. Canan Teneriie. Arch. HJdrobioL. 128 : 209-235. Ish (23) AS. bTLSSOzI. B. bf.kLAIQWST. SI. B&Z. J.H. BLACKBURV, P.D. aViT.4GE 435 ? Xybom O. 1954.- Entornologicil resulu of the Finnish cxpedition Thcowald B. 1977.- Die Tipuliden von bfakatonesien (Insecta. io the Canary Islands. 1917-1951. No. 9. Sorne additionj co thc Diptc:a. l¡pulidxJ. Eln syscernatisthe: und zoogeopraphischer cric~opcer~usfauna of the Canary Ij!snds. Co~mbiot. Soc. sil. Beiuog zur hcnnrnir von inseifmnen. ~cau.%rric.26 (335) : 153- -fenn.. 1119): 1-3. 104. l-,~nr.oir 51. A. 141 1.- hune exomoiugique Ces Iks Canuies. Sé- Orchymont A. d'. 19-16 - Les Paipiconia des iitj Xdaniiqücs .iIént. AíiL;. r. Hisr WI. &!s.. 1~2)20 : 1-57. .tour de 5í.P. Lesne d-ns i3 Grande Cznuit i.1901-1903). Di. Di- Paxerwn B. D. & Amar \E'. 1986.- Scsre4 suLsers znd rhc SLCUC~J- pdrer : Pqicho\?:dx. Sd!. Mus. CXE. H!st. Ea.. Paris. 27 : 296- :e of insalar mammali~nfaunas and archipiqos. Bid. J. Linr. 297. SOC..28 :65-52. Valle K. J. 1935.- Die Odonatcn der Ksnarixhcn inseln. Comm. Rosenzweig hl. L. 1995.- Specics diversie tn space and rime. bioi, Soc sci.jrnc. 5 (5) : 1-y. Carnhridp Enivrrsiry Press. C&~!brid$c: -136 p. Vdle K. J. 1955.- Zygoprcrcn íOdonau1 van Qcn Kmiuischen In- s:& R. 1336.- Fam. Dividar. Culicidur. Chiranomidac. seln. A~Je;lr. fdnn.. 21 : !32. rna!uno!eidao; Ceraiopoponidm. Simuíiidur. p. 19-39. In : \Wias:cn \i: IW.- CatdOg~JCoirhc Co~copccrousinsccs of& R. T. ' Frey (d.): Die Diprereniauna der Kcnaritchen heln irnd ihrc C~ariesin &e collectim oi Lie hitish hfujeüm. 'iaylor k Frui- Pmb!ema. Comm. biol. SIX.sci. ~cM.. 6 (1) : 1-237. cis. Lcndon : MSp. Tunanini ¿. 1954.- Resul:nii encorr,olosici delia s?ecizinni frnlm- 2imnier;ninn G.1934.- Zur Viasscnvanzeahuna der Kanarischcn dese al1 Canaric. No. 5. Wialiadbrrgi p.. sp. e F mac'ererrsii Snseln und deren zocpcogrspiiisthe Beriehungen zum Fesiland Soualhier (Hem.. Hei., VeliidacL Comm. bid. Soc. ssi. fenn.. 14 und andcren Inrclngruppcn (Insecta : Heuroptcra : Hydrocori- (5) : 1-7. sae). Cour. Forsch. inst. Srnr.í-enbrr3.71 :53 -60.