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The Oligolectic Solitary Bee Melitta Tricinta Kirby, 1802 (Sw. Rödtoppebi) in Sweden (Hymenoptera, Apoidea, Melittidae)* L

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The Oligolectic Solitary Bee Melitta Tricinta Kirby, 1802 (Sw. Rödtoppebi) in Sweden (Hymenoptera, Apoidea, Melittidae)* L Ent. Tidskr. 130 (2009) The bee Melitta tricincta in Sweden The oligolectic solitary bee Melitta tricinta Kirby, 1802 (Sw. rödtoppebi) in Sweden (Hymenoptera, Apoidea, Melittidae)* L. ANDERS NILSSON & ISABEL ALVES-DOS-SANTOS Nilsson, L.A. & Alves-dos-Santos, I.: The oligolectic solitary bee Melitta tricinta Kirby, 1802 (Sw. rödtoppebi) in Sweden (Hymenoptera, Apoidea, Melittidae). [Rödtoppebiet Melitta tricinta i Sverige (Hymenoptera, Apoidea, Melittidae).] – Entomologisk Tid- skrift 130 (2): 85-98 Uppsala, Sweden 2009. ISSN 0013-886x. In Sweden, the oligolectic solitary bee Melitta tricinta Kirby, 1802 has been reported from a few southern provinces and red listed as endangered (EN). In order to explore the conser- vation status, we studied the reputed and potential material of the species as well as carried out field studies in the area of known modern occurrence, viz. the military training field and Natura 2000-area Revingehed in the southernmost province Skåne. Our results showed that there is no valid Swedish record before 1930, suggesting a fairly recent colonization. There is no evidence that a regional decline during later decades includes Skåne. In Rev- ingehed 2008, the bee was still present on previously detected localities but also occurred on numerous other, hitherto unknown localities that contained the exclusive food plant, the red bartsia, Odontites vulgaris (Scrophulariaceae). Nesting sites, on the other hand, seemed not a limiting factor. There was evidence of a metapopulation-like situation, in which bees have a capacity to disperse and occupy even relatively isolated, small and tem- porary ruderal-type habitats. In total, 25 subpopulations were recorded and the population size estimated to ca. 7000 individuals. Unlike many other red listed bees in Revingehed, M. tricinta was largely favoured by the current more-or-less extensive management regime of year-around grazing. Like many, the species was favoured by the considerable military disturbance of the light, largely sandy soils. We conclude that both negative and positive factors have influenced the bee speciesM. tricinta in Sweden during the 80 years of known occurrence and that the current conservation status is promising in spite of a single known large population. L. Anders Nilsson, Dept. of Plant Ecology, Evolutionary Biology Centre, Uppsala Univer- sity, Villavägen 14, SE-752 36 Uppsala, Sweden. E-mail: [email protected] Isabel Alves-dos-Santos, Dept. of Ecology, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, trav. 14, n. 321. Cidade Universitária, São Paulo, SP. 05508-900, Brazil. E-mail: [email protected] Of the 17,553 known bee species, the Melittidae specializations including oligolecty (pollen col- s. lat. constitutes a small (157 species) but in the lection from a single plant family) have turned specialization for foraging on flowers unusually into a formidable threat to survival. For example, diverse family (Michener 2007). Considering to- in Sweden the melittid fauna numbers eight spe- day’s enforced environmental destruction from cies (Nilsson 2003), all of which are oligolectic land use intensification, no doubt the melittid (Michez & al. 2008). Of these, six have been red *This paper commemorates the ninetieth birthday of Charles D. Michener, the power source of modern bee research. 85 L. Anders Nilsson & Isabel Alves-dos-Santos Ent. Tidskr. 130 (2009) Figure 1. Melitta tricinta ♂ and ♀. Photo: L. Anders Nilsson. Rödtoppebi ♂ och ♀. listed, viz. as RE nationally extinct (Dasypoda erberg 2008) refers to the distinctive specializa- argentata and D. aurata (= D. suripes, see Bak- tion to collect pollen from “rödtoppa”, i.e. red er 2002), EN endangered (Melitta melanura (= bartsia Odontites vulgaris (Scrophulariaceae), a M. wankowiczi, see Nilsson 2007) and M. tricin- unique adaptation among Swedish bee species. ta), and NT near threatened (Dasyopda hirtipes, and formerly also Melitta leporina) (Gärdenfors Material and Methods 2000, 2005). Only Melitta haemorrhoidalis and The work consisted of both museum studies and Macropis europaea are yet wide-spread (LAN field observation. We investigated the scientific pers. obs.). literature, museums and private collections for The purpose of the present study was to all Swedish actual, reputed or potential mate- clarify the history, distribution, and conserva- rial of Melitta tricinta Kirby, 1802. Material tion status of M. tricinta in Sweden. This en- was found in the Swedish Museum of Natural dangered species has been recorded from a few History, Stockholm (NHRS) and the Zoological southeastern provinces (Gärdenfors 2005). It Museum, Lund (ZML). Information on potential has not been found in Norway (Ø. Berg unpubl. specimens was also available from the Zoologi- checklist 2001) and Finland but as close as in cal Museum Helsinki (ZMH), Finland. Speci- the St. Petersburg area in Russia and Estonia mens in the private collections of M. Franzén, (Söderman & Leinonen 2003), and is (probably M. Larsson, B.G. Svensson and J. Tengö were mostly under the name M. nigricans) known studied. We have not seen the name-bearing type from several parts of Denmark (Jörgensen 1921, of Melitta tricinta Kirby, 1802 (in the Natural H.B. Madsen pers. comm.). The species occurs History Museum, London (former British Mu- widely across Europe, from southern England seum)), but conform to the stable interpretation in the west, Spain, Sicily (Italy) and Greece in of current authors in identification of the species the south, and Romania in the east, and further (as in Warncke 1973, Scheuchl 1996, 2006, Ce- eastward to Udmurtia and Yakut in Russian Asia lary 2005, Michez & Eardley 2007). (Warncke 1973, 1981, Else 1998, Celary 2005, Field observations of M. tricinta were carried Michez & Eardley 2007). It is a Euro-Siberian out in 2002, 2004, 2006 (by LAN) and 2008 (by element. IAS and LAN) in the only known Swedish area The species epithet tricinta refers to the sharp still containing a population, viz. the military bands of dense whitish filtery hairs at the termi- training field and Natura 2000-area Revingehed nal border of the tergites (Fig. 1). The Swedish in the province of Skåne. In 2008 in Revinge- vernacular name “rödtoppebi” (Nilsson & Ced- hed, we carried out an inventory of the previ- 86 Ent. Tidskr. 130 (2009) The bee Melitta tricincta in Sweden ously detected localities/subpopulations and Revingehed. Most of the areas are subject to also of all other potential localities where we grazing, some to haymaking and only a few are saw the food plant (Odontites vulgaris). We de- excluded from farming practices. The exact geo- fined a subpopulation as a distinctly delimited graphical positions of subpopulations of this red occurrence of the bee species due to a clump of listed species have been deposited at the Swed- food plant patches separated from other such ish Species Information Centre (ArtDatabanken, clumps by ca. 200 m; the spatial distribution of SLU, Uppsala). the patches and sparsely vegetated ground sug- gested that pollen collecting females hardly fly Results longer than 150 m between foraging area and History and distribution potential nesting areas. The presence/absence Kirby’s species epithet tricinta was used on and quantity of bees were obtained from one or Swedish bee material first by the young Finnish, more census walks through the food plant patch- later famous botanist William Nylander (1824– es in each subpopulation. The observed size of a 1899). He referred to “Kirbya tricinta” from subpopulation (number of individuals) was the Ystad (Skåne) in NHRS (1852a) and “Cilissa sum of the highest number of observed bees of tricinta” collected on Gotland by Carl Henrik each sex in the walked area. We made an ap- Boheman (1852b). In coll. Nylander (ZMH) and proximate estimation of the total subpopulation NHRS including coll. Boheman, however, there size by considering the amount of food plant, the was no specimen of M. tricinta sensu Kirby stage of flight period at the census walk, and the from Ystad or Gotland. In coll. Nylander there size of the habitat. The floral resource in terms is a male specimen of Melitta leporina (Panzer, of O. vulgaris plants, the availability of seem- 1799) with the pinned labels ”Gl.”(= Gotland), ingly possible nesting sites, and threats for the ”Bhn” (= leg. C.H. Boheman) and ”Kirbya tri- subpopulation of the bee were also estimated cinta” (L. Norén pers. obs. & det. 2003). In the during the census walk. We used a 4-scale quan- revision of the Swedish bee fauna by Thomson tification of the amount of food plant: “Large” (1872), Nylander’s Cilissa 3-cincta (as well as corresponds to >100 m2, “medium” to >5 m2 Melitta 3-cincta Kirby) was listed as a synonym (but <100 m2), “small” to <5 m2 (but >2 m2), and of Cilissa leporina (Panzer) (now Melitta l.). “very small” to <2 m2 covered by O. vulgaris. In coll. Thomson (ZML) there was no Swedish In order to explore the M. tricinta – O. vul- specimen of M. tricinta sensu Kirby. garis interaction also from the principal point In the treatment of the Swedish bee fauna by of possible mutualism and interdependence, we Aurivillius (1903), the epithet tricinta was not conducted experiments with three different sets mentioned. Perkins (1917) presumed that M. of flowers: isolated (bagged) during flowering, tricinta Kirby was a (senior) synonym of Kir- isolated after subjected to single visits from M. bya melanura Nylander, a taxon described from tricinta, and open-visited control. Seed produc- Gotland. For a period of 90 years this synonymy tion was used as the measure of pollination suc- was taken for granted by many authors (namely cess. Blüthgen 1930, Stoeckhert 1933, Erlandsson The inventory was conducted during the 1960, Warncke 1973, Richards 1978, Erlands- period 21 July – 16 August 2008. The first 11 son & al. 1988, Scheuchl 1996, 2006, Schwarz days were very dry and warm, with tempera- & al. 1996, Celary 2005). Nevertheless, it was tures reaching 30°C, and no clouds.
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