Abstract:
:Regressive evolution of structures associated with vision in cave-dwelling organisms is the focus of intense research. Most work has focused on differences between extreme visual phenotypes: sighted, surface animals and their completely blind, cave-dwelling counterparts. We suggest that troglodytic systems, comprising multiple populations that vary along a gradient of visual function, may prove critical in understanding the mechanisms underlying initial regression in visual pathways. Gene expression assays of natural and laboratory-reared populations of the Atlantic molly (Poecilia mexicana) revealed reduced opsin expression in cave-dwelling populations compared with surface-dwelling conspecifics. Our results suggest that the reduction in opsin expression in cave-dwelling populations is not phenotypically plastic but reflects a hardwired system not rescued by exposure to light during retinal ontogeny. Changes in opsin gene expression may consequently represent a first evolutionary step in the regression of eyes in cave organisms.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Tobler M,Coleman SW,Perkins BD,Rosenthal GGdoi
10.1098/rsbl.2009.0549subject
Has Abstractpub_date
2010-02-23 00:00:00pages
98-101issue
1eissn
1744-9561issn
1744-957Xpii
rsbl.2009.0549journal_volume
6pub_type
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