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Mepraia Spinolai in the Southeastern Pacific Ocean

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Mepraia Spinolai in the Southeastern Pacific Ocean Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 95(2): 167-170, Mar./Apr. 2000 167 Mepraia spinolai in the Southeastern Pacific Ocean Coast (Chile) - First Insular Record and Feeding Pattern on the Pan de Azúcar Island Hernán Sagua Franco+, Jorge Araya Rojas, Jorge González Cortes, Iván Neira Cortes Unidad de Parasitología, Facultad de Ciencias de la Salud, Universidad de Antofagasta, Casilla 170, Antofagasta, Chile In a field collection performed at Pan de Azúcar Island in Northern Chile, 95 specimens represent- ing all instars of Mepraia spinolai were collected. The intestinal contents of 55 specimens were exam- ined for Trypanosoma cruzi infection and were found to be negative. This is the first record of an insular habitat for M. spinolai, where the insects had fed mainly on seabirds (78%), some on marine mammals (5%), and some on reptiles (7%). Key words: Mepraia spinolai - insular habitat - blood meal - Chile In Chile there are only two representative spe- MATERIALS AND METHODS cies of Triatominae: the domiciliary Triatoma Pan de Azúcar island (Lat. 26' 08' S, Long. 70' infestans (Klug 1834) and the sylvatic Mepraia 40' W) is located 800 m from its neighboring coast. spinolai (Porter 1934) which is known only in It is 182 m high and 5 km distant from the outlet Chile. In this country both species have been found stream of the same name (Pan de Azúcar), which to be naturally infected with Trypanosoma cruzi, marks the limit between the regions of Antofagasta (Miles 1976, Schenone et al.1980, Schofield et al. and Atacama. In general the mainland coast of 1982, Apt & Reyes 1986, Sagua 1988, Schenone this area is stony and not very high, but is backed & Rojas 1989, Lent et al. 1994). by a range of mountains, which can reach 595 m M. spinolai is the only specie of Triatominae in height. The marine climate shows only slight with wing polymorphism. It is an aggressive in- temperature changes during the day, cloudiness that sect which will feed on any host, even during day- disperses at midday, high humidity, strong sunshine light (Gajardo-Tobar 1953, Lent & Wygodzinsky from the east, marine winds mainly from the west, 1979, Sagua 1983, Frías et al. 1987, Canals et al. and a saline atmosphere and soil. The Pan de 1998). It is almost entirely sylvatic, and only oc- Azúcar island flora and fauna are similar to those casionally reported at homes or in peridomestic of the littoral plain of the continental area of the habitats (Schenone et al. 1980, Schofield et al. Atacama Desert. Cacti and bushes, marine birds, 1982, 1998, Aguilera et al. 1986). carrion birds, lizards and the marine mammals This study records details of fieldwork per- Lutra felina (sea otter) and Otaria flavescens (sea formed at Pan de Azúcar Island, located in Chil- lions) are predominant on the island. ean Administrative Región III. The island is a sea- Currently this area is a natural park reserva- birds and marine mammals national park reserva- tion, since Spheniscus humboldti, (Humboldt pen- tion where M. spinolai was collected in all instars guin) and L. felina (marine otter) have their repro- of its life cycle. ductive habitats in this island. Field and laboratory procedures - Triatomines were collected during the summer of 1995 by manual sampling, using blunt forceps. The insect presence was investigated under stones and in bird nests and involved the collection of active walk- ing bugs. Some bugs were also captured as they This work was supported from DGI-Universidad de approached the researchers (nymphs II and III). Antofagasta, Chile. Bugs were maintained in flasks with corrugated +Corresponding author. Fax: (005655) 247786. E-mail: filter paper as a resting site. Labelled flasks were [email protected] sealed and transported to our laboratory. Received 3 May 1999 In the laboratory, live and dead triatomines were Accepted 4 January 2000 counted and instars were noted. The live bugs were 168 M. spinolai in the Pacific Ocean Coast (Chile) Hernán Sagua Franco et al. examined for anterior and posterior parasites as TABLE I described by D’Alessandro (1972). Dissections Total Mepraia spinolai caught at Pan de Azúcar were carried out in physiological saline with the island (Chile) intestines and genitalia being removed from the Instars I II III IV V Adults Total bugs (one per slide). Genitalia were preserved for histological studies. Samples of the stomach Alive 1 6 12 11 14 11 55 contents (promesenteron) were placed in a poly- Dead 4 4 10 9 5 8 40 styrene microtitration plate containing drops of Total 5 10 22 20 19 19 95 fresh saline in order to perform the bloodmeal analysis by double diffusion assay as described by Wisnivesky-Colli et al. (1980). Polyclonal an- tisera were obtained by injecting rabbits with three stage nymph were more commonly seen in the sum- doses of 50 µg of total proteins from marine mam- mer (December and January). mal (O. flavescens), rodent (Mus musculus) and To our knowledge, this is the first report of a man; sea birds (including a pool of seroproteins field collection of M. spinolai in an insular marine from Larus dominicanus, L. modestus, S. humboldti habitat. M. spinolai is unique to Chile where its and Pelecannus occidentalis), carrion birds geographical distribution and ecological range has (Cathartes aura) and reptiles (Tachymenis been previuosly studied only in mainland popula- peruvianus). tions (Schenone et al. 1980, Schofield et al. 1982, 1998, Sagua 1983). RESULTS AND DISCUSSION The main sylvatic ecotopes of this species along In order to characterize the M. spinolai main- the Pacific Ocean coast are bird nests (especially land habitat in the northern Chilean coast, we car- of marine birds), stony areas colonized by lizards, ried out several field studies in wild sectors be- and locations near to the resting places of sea ginning in 1985. We concentrated our activities wolves (O. flavescens) (Lent & Wygodzinsky on those areas used by big herds of sea lions for 1979, Schofield et al. 1998). reproduction and resting activities, thereby gener- Blood meal analysis was studied by double ating in their surroundings a trophic community diffusion and showed that these bugs preferentially constituted by other marine mammals, sea birds, fed on sea birds (78 %), marine mammals (14 %) birds of prey, and lizards. Within these same areas and lizards (7 %) (Table II). This appears to be the we have also found colonies of M. spinolai and first record of triatomine feeding on marine mam- ticks such as Argas neghmei. mals, however it has been previously reported that The results of these observations have allowed T. dimidiata and Rhodnius prolixus feed on cold- us to describe this new insular habitat for M. blooded hosts (amphibians and reptiles) as a mi- spinolai on Pan de Azúcar Island. This habitat is nor food source (5-10 %), in sylvatic areas of Cen- a protected natural park reservation where S. tral and South America (Zeledón et al. 1970, Pifano humboldti (Humboldt penguin) nests during its 1973). In Chile, Aguilera et al. (1986) reported annual migration, along with other species of sea bloodmeals from reptiles in six M. spinolai col- birds such as seagulls (L. dominicanus and L. lected from the Chilean Administrative Region IV modestus) and pelicans (P. occidentalis). Marine (Coquimbo). otters (L. felina) and sea lions (O. flavescens) are also present and it is common to observe different species of lizards that feed on the cliff’s flora and marine fauna. TABLE II In our collections, we found that all stages Mepraia spinolai in Pan de Azúcar island (Chile). of M. spinolai nymphs, which are normally black, Blood meal analysis by double diffusion test used camouflage with sand grains. This camou- Antisera Reactive Non reactive flage obstructed our bug collection work. A simi- lar phenomen was previously observed for Tri- No. % atoma dimidiata (Zeledón et al. 1969), a vector of Otaria flavescens 81547 Chagas disease in Central America. Mus musculus -55 Table I shows the total number of bugs cap- Man (OIV-Rh+) - 55 tured during a three day period. The prominence Sea birdsa 43 78 12 of young instars is notable. Mortality of young Cathartes aura -55 instars is probably high due to the difficulty in Tachymenis peruvianus 47 51 obtaining blood meals in this extremely isolated a: pool including Larus dominicanus, L. modestus, location. Fishermen confirmed that adults and V Spheniscus humboldti and Pelecannus occidentalis. Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 95(2), Mar./Apr. 2000 169 M. spinolai has the capacity to live in both Tapia C, Cattan P 1998. Biología comparada de peridomestic and sylvatic habitats but its feed- Mepraia spinolai en condiciones de laboratorio y ing patterns and infection rates with T. cruzi, could de terreno: cinco años de estudio. Parasitol al Día vary within the different ecologic environments. 22: 72-78. In Chile two geographically separate and ecologi- D’Alessandro A 1972. New experimental vectors of Colombian Trypanosoma rangeli. J Med Entomol cally very different areas have been described: (a) 9: 187-195. the Pacific Ocean litoral areas of Adminstrative Frías D, Martínez H, Wallace A 1987. Some taxonomic Regions I, II and III, where currently all M. spinolai features of Triatoma spinolai Porter (Hemiptera: have been collected from sylvatic environments Triatominae). Acta Entomol Chil 14: 155-170. not influenced by the human presence. These in- Gajardo-Tobar R 1953. Algo más sobre Mepraia spinolai sects are always non infected by T. cruzi (Schofield Porter (Hemiptera- Triatominae). Rev Chil Entomol et al. 1998); (b) the Intermedia and Andean areas 3: 117-125. of Administrative Regions III, IV, V and González J, Araya J, Sagua H, Cornejo J, Vargas L 1987. Metropolitana Region, where M.
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