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A cytological study of the Pacific black fly Simulium cataractarum (Diptera: Simuliidae)

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Polytene chromosomes from the salivary glands of Simulium cataractarum larvae from the islands of Moorea and Tahiti were examined. Intraspecific comparisons revealed a polymorphism in the short arm of chromosome I, termed the IS-1ca inversion. This inversion sequence was significantly heterozygous in the Tahitian populations (s/i), while the Moorean populations were all homozygous for the standard sequence (s/s). These two island populations seem to be reproductively isolated from one another. Thus, two cytotypes are recognized. Based on biogeographical relationships between the islands, we argue that the Moorean cytotype is likely to be ancestral to the Tahitian cytotype. Furthermore, a heterozygote advantage may exist in the Tahitian cytotype. Chromosomal maps for S. cataractarum are presented.

Nous avons examiné les chromosomes polytènes des glandes salivaires chez des larves de Simulium cataractarum des îles de Moorea et de Tahiti. Une comparaison interspécifique a démontré l'existence de polymorphisme dans le bras court du chromosome I, l'inversion IS-1ca. Cette séquence d'inversion s'est révélée significativement hétérozygote chez les populations tahitiennes (s/i), alors que les populations de Moorea sont homozygotes en ce qui concerne la séquence standard (s/s). Ces deux populations insulaires semblent génétiquement isolées l'une de l'autre et il faut donc reconnaître deux cytotypes. D'après les relations biogégraphiques entre les deux îles, nous croyons que le cytotype mooréen est l'ancêtre du cytotype tahitien. Il se peut aussi que l'hétérozygotie du cytotype tahitien présente un avantage. On trouvera ici des cartes chromosomiques de S. cataractarum.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: October 1, 2002

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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