Why are anopheline mosquitoes not present in the Seychelles ?
Background: Species of anopheline mosquitoes are largely distributed over emerged lands around the world and, within the tropics, few areas are without these insects, which are vectors of malaria parasites. Among the exceptions is the Seychelles archipelago in the western Indian Ocean. However, in t...
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ftird:oai:ird.fr:fdi:010053447 2023-05-15T13:58:21+02:00 Why are anopheline mosquitoes not present in the Seychelles ? Robert, Vincent Rocamora, G. Julienne, S. Goodman, S. M. 2011 text/pdf http://www.documentation.ird.fr/hor/fdi:010053447 EN eng http://www.documentation.ird.fr/hor/fdi:010053447 oai:ird.fr:fdi:010053447 Robert Vincent, Rocamora G., Julienne S., Goodman S. M. Why are anopheline mosquitoes not present in the Seychelles ?. Malaria Journal, 2011, 10, p. 31. text 2011 ftird 2020-08-21T06:56:25Z Background: Species of anopheline mosquitoes are largely distributed over emerged lands around the world and, within the tropics, few areas are without these insects, which are vectors of malaria parasites. Among the exceptions is the Seychelles archipelago in the western Indian Ocean. However, in the Aldabra island group, located in the extreme western portion of the archipelago, Anopheles gambiae s.l. was introduced, leading to massive proliferation and then elimination, with the most recent autochthonous malaria cases recorded in 1931. Methods: In order to re-examine the absence of anopheline mosquitoes in the Seychelles, an entomological field survey was conducted in December 2008 at 17 sites on four granitic islands, including Mahe and Praslin, and ten sites on coralline atolls in the extreme west, including Aldabra. Results: No evidence of larval or adult anophelines was found at the surveyed sites, which supports their absence in the Seychelles. Conclusions: In the granitic islands of the Seychelles, the climate is favourable for anophelines. However, these islands are protected by their remoteness and prevailing seasonal winds. In addition, stagnant freshwater, required in anopheline larval development, is relatively uncommon on the granitic islands because of the steep slopes. In the southwestern atolls (Aldabra and Providence-Farquhar groups), the presence of a long dry season of up to nine months and the total absence of permanent natural freshwater prevents the breeding of anophelines and their successful colonization. The Seychelles does not have any native land mammals and like in other parts of the world (Antarctica, Iceland, New Caledonia, Central Pacific islands) their absence is associated with the lack of anophelines. This suggests an obligatory relationship for anophelines to feed on terrestrial mammals, without alternative for blood-feeding sources, such as bats, birds and reptiles. Text Antarc* Antarctica Iceland IRD (Institute de recherche pour le développement): Horizon Indian Pacific |
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Background: Species of anopheline mosquitoes are largely distributed over emerged lands around the world and, within the tropics, few areas are without these insects, which are vectors of malaria parasites. Among the exceptions is the Seychelles archipelago in the western Indian Ocean. However, in the Aldabra island group, located in the extreme western portion of the archipelago, Anopheles gambiae s.l. was introduced, leading to massive proliferation and then elimination, with the most recent autochthonous malaria cases recorded in 1931. Methods: In order to re-examine the absence of anopheline mosquitoes in the Seychelles, an entomological field survey was conducted in December 2008 at 17 sites on four granitic islands, including Mahe and Praslin, and ten sites on coralline atolls in the extreme west, including Aldabra. Results: No evidence of larval or adult anophelines was found at the surveyed sites, which supports their absence in the Seychelles. Conclusions: In the granitic islands of the Seychelles, the climate is favourable for anophelines. However, these islands are protected by their remoteness and prevailing seasonal winds. In addition, stagnant freshwater, required in anopheline larval development, is relatively uncommon on the granitic islands because of the steep slopes. In the southwestern atolls (Aldabra and Providence-Farquhar groups), the presence of a long dry season of up to nine months and the total absence of permanent natural freshwater prevents the breeding of anophelines and their successful colonization. The Seychelles does not have any native land mammals and like in other parts of the world (Antarctica, Iceland, New Caledonia, Central Pacific islands) their absence is associated with the lack of anophelines. This suggests an obligatory relationship for anophelines to feed on terrestrial mammals, without alternative for blood-feeding sources, such as bats, birds and reptiles. |
format |
Text |
author |
Robert, Vincent Rocamora, G. Julienne, S. Goodman, S. M. |
spellingShingle |
Robert, Vincent Rocamora, G. Julienne, S. Goodman, S. M. Why are anopheline mosquitoes not present in the Seychelles ? |
author_facet |
Robert, Vincent Rocamora, G. Julienne, S. Goodman, S. M. |
author_sort |
Robert, Vincent |
title |
Why are anopheline mosquitoes not present in the Seychelles ? |
title_short |
Why are anopheline mosquitoes not present in the Seychelles ? |
title_full |
Why are anopheline mosquitoes not present in the Seychelles ? |
title_fullStr |
Why are anopheline mosquitoes not present in the Seychelles ? |
title_full_unstemmed |
Why are anopheline mosquitoes not present in the Seychelles ? |
title_sort |
why are anopheline mosquitoes not present in the seychelles ? |
publishDate |
2011 |
url |
http://www.documentation.ird.fr/hor/fdi:010053447 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
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Antarc* Antarctica Iceland |
genre_facet |
Antarc* Antarctica Iceland |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010053447 oai:ird.fr:fdi:010053447 Robert Vincent, Rocamora G., Julienne S., Goodman S. M. Why are anopheline mosquitoes not present in the Seychelles ?. Malaria Journal, 2011, 10, p. 31. |
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1766266588945711104 |