Male terminalia variation in the rainforest dwelling <Emphasis Type="Italic">Drosophila teissieri</Emphasis> contrasts with the sperm pattern and species stability |
| |
Authors: | Dominique Joly Marie-Louise Cariou Tendai Mhlanga-Mutangadura Daniel Lachaise |
| |
Institution: | 1.Laboratoire Evolution, Génomes et Spéciation,CNRS UPR 9034,Gif-sur-Yvette Cedex,France;2.Orsay Cedex,France;3.Department of Biological Sciences,University of Zimbabwe,Mount Pleasant,Zimbabwe;4.Department of Veterinary Pathobiology,University of Missouri,Columbia,USA |
| |
Abstract: | It is commonly recognized that speciation does not necessarily imply extensive variation between populations, and what the
speciation process per se consists of still remains an unanswered question. We advocate here that the variation of male terminalia
does not necessarily result in noticeable reproductive isolation. We report whether there is invariance or variance of traits
central to sexual selection processes (i.e. male terminalia and sperm length) compared to traits which are generally assumed
to vary more neutrally (i.e. allozymes) in the strictly Afrotropical forest-dwelling continental species Drosophila teissieri. Three geographic blocks can be recognized along the present range of the species. Our data suggest that the components of
the species integrity do not obey the variance/invariance alternative consistently. Male terminalia and allozymes show extensive
variation while sperm length distribution is strikingly similar between the geographic blocks. It is therefore inferred that
sperm length might be one of the major targets of stabilizing selection. Finally, it is suggested that the striking fit between
the extent of sperm heteromorphism (within male) and sperm polymorphism (between males) is instrumental in maintaining the
species integrity. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|