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Évolution d'une Spécialisation Saisonnière Chez Drosophila Erecta (Dipt., Drosophilidae)

Évolution d'une Spécialisation Saisonnière Chez Drosophila Erecta (Dipt., Drosophilidae) Summary Further evidence are given of the status of specialist of Drosophila erecta. The erecta-Pandanus association is perennial but not permanently obligatory. The records on erecta lead to the concept of “seasonal specialization”. Rather than a species status, specialization appears to be a generation-dependent allocative option. Those generations appearing when Pandanus fruits are available, are strictly and obligatorily dependent on Pandanus for breeding, whereas those starved of Pandanus fruit display, all things considered, more opportunistic behavior. Regarding the very low level of population size in those generations starved of Pandanus, one can expect that the energetic cost paid by the transitional generations is high. This likely explains why the specialization strategy has been selected for and since maintained. The populations of P. candelabrum show a patchy riparian distribution in the Ivory Coast involving a discrete distribution in the populations of erecta. Nevertheless, no differences were evidenced at the chromosomal and reproductive levels. Between-patch synchronism in fruiting in the overall southern Ivory Coast provides a short-term predictability for the benefit of four to five consecutive generations of erecta. When this short-term predictability drastically decreases, the strict specialization pattern of the Drosophila is no longer maintained. However, perennially of the status of specialist at the species level is likely accounted for by long-term predictability due to yearly periodicity in Pandanus fruiting. Therefrom, it can be more clearly understood why specialization, as issue of an evolutionary pathway, does not necessarily lead to a dead end. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales de la Société entomologique de France (N S ) Taylor & Francis

Évolution d'une Spécialisation Saisonnière Chez Drosophila Erecta (Dipt., Drosophilidae)

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Publisher
Taylor & Francis
Copyright
© 1983 Société entomologique de France
ISSN
2168-6351
eISSN
0037-9271
DOI
10.1080/21686351.1983.12278361
Publisher site
See Article on Publisher Site

Abstract

Summary Further evidence are given of the status of specialist of Drosophila erecta. The erecta-Pandanus association is perennial but not permanently obligatory. The records on erecta lead to the concept of “seasonal specialization”. Rather than a species status, specialization appears to be a generation-dependent allocative option. Those generations appearing when Pandanus fruits are available, are strictly and obligatorily dependent on Pandanus for breeding, whereas those starved of Pandanus fruit display, all things considered, more opportunistic behavior. Regarding the very low level of population size in those generations starved of Pandanus, one can expect that the energetic cost paid by the transitional generations is high. This likely explains why the specialization strategy has been selected for and since maintained. The populations of P. candelabrum show a patchy riparian distribution in the Ivory Coast involving a discrete distribution in the populations of erecta. Nevertheless, no differences were evidenced at the chromosomal and reproductive levels. Between-patch synchronism in fruiting in the overall southern Ivory Coast provides a short-term predictability for the benefit of four to five consecutive generations of erecta. When this short-term predictability drastically decreases, the strict specialization pattern of the Drosophila is no longer maintained. However, perennially of the status of specialist at the species level is likely accounted for by long-term predictability due to yearly periodicity in Pandanus fruiting. Therefrom, it can be more clearly understood why specialization, as issue of an evolutionary pathway, does not necessarily lead to a dead end.

Journal

Annales de la Société entomologique de France (N S ) – Taylor & Francis

Published: Apr 30, 1983

Keywords: Drosophila erecta; Pandanus; spécialisation saisonnière; options allocatives des générations; hybridations; inversions chromosomiques; phénologie de la fructification

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