Please use this identifier to cite or link to this item: https://doi.org/10.1098/rsbl.2012.1098
Title: Rapid evolution of troglomorphic characters suggests selection rather than neutral mutation as a driver of eye reduction in cave crabs
Authors: Klaus, S.
Mendoza, J.C.E. 
Liew, J.H.
Plath, M.
Meier, R. 
Yeo, D.C.J. 
Keywords: Neutral evolution
Regressive evolution
Relaxed selection
Sundathelphusa
Trait reduction
Issue Date: 23-Apr-2013
Citation: Klaus, S., Mendoza, J.C.E., Liew, J.H., Plath, M., Meier, R., Yeo, D.C.J. (2013-04-23). Rapid evolution of troglomorphic characters suggests selection rather than neutral mutation as a driver of eye reduction in cave crabs. Biology Letters 9 (2) : -. ScholarBank@NUS Repository. https://doi.org/10.1098/rsbl.2012.1098
Abstract: This study asked whether reductive traits in cave organisms evolve at a slower pace (suggesting neutral evolution under relaxed selection) than constructive changes, which are likely to evolve under directional selection. We investigated 11 subterranean and seven surface populations of Sundathelphusa freshwater crabs on Bohol Island, Philippines, and examined constructive traits associated with improved food finding in darkness (increased leg and setae length) and reductive traits (reduced cornea size and eyestalk length). All changes occurred rapidly, given that the age of the most recent common ancestor was estimated to be 722-271 ka based on three mitochondrial markers. In order to quantify the speed of character change, we correlated the degree of morphological change with genetic distances between surface and subterranean individuals. The temporal pattern of character change following the transition to subterranean life was indistinguishable for constructive and reductive traits, characterized by an immediate onset and rapid evolutionary change. We propose that the evolution of these reductive traits-just like constructive traits-is most likely driven by strong directional selection. © 2013 The Author(s) Published by the Royal Society.
Source Title: Biology Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/101520
ISSN: 17449561
DOI: 10.1098/rsbl.2012.1098
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