Convergent evolution of the cavefish Astyanax (Characidae, Teleostei):: genetic evidence from reduced eye-size and pigmentation

被引:106
作者
Wilkens, H
Strecker, U
机构
[1] Univ Hamburg, Inst Zool, D-20146 Hamburg, Germany
[2] Univ Hamburg, Zool Museum, D-20146 Hamburg, Germany
关键词
Anoptichthys; blindness; crossing experiments; melanophore; mutation pressure; relaxed selection; retina; rudimentation; speciation; troglobite;
D O I
10.1111/j.1095-8312.2003.00230.x
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
More than 20 populations of the cave-dwelling characid Astyanax occur within a restricted karst area in Mexico. The fish possess reduced eyes without lenses and visual cells. It is still an open question as to whether this condition evolved convergently after multiple entries of the surface ancestor into the different caves or whether a single cave ancestor, already characterized by reduced eyes, spread secondarily within them. In the crosses between specific populations, specimens appear that deviate considerably from those of the parents. They possess larger and better-developed eyes with histologically intact lenses and visual cells; they thus have the structural potential for vision. This indicates that in different cave populations, different mutations in the eye gene system have occurred. In cases where these non-functional rudimentary genes are recombined in hybrid specimens, gene expression may be restored. This is the result of separate evolution of several Astyanax cave populations. (C) 2003 The Linnean Society of London.
引用
收藏
页码:545 / 554
页数:10
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