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Title:
Mechanisms of Adaptation in a Predator-Prey Arms Race: TTX-Resistant Sodium Channels
Authors:
Geffeney, Shana; Brodie, Edmund D.; Ruben, Peter C.; Brodie, Edmund D.
Affiliation:
AA(Department of Biology, Utah State University, Logan, UT 84322, USA.), AB(Department of Biology, Utah State University, Logan, UT 84322, USA.), AC(Department of Biology, Utah State University, Logan, UT 84322, USA.), AD(Department of Biology, Indiana University, Bloomington, IN 47405, USA.)
Publication:
Science, Volume 297, Issue 5585, pp. 1336-1339 (2002). (Sci Homepage)
Publication Date:
08/2002
Category:
EVOLUTION
Origin:
SCIENCE
Abstract Copyright:
(c) 2002: Science
DOI:
10.1126/science.1074310
Bibliographic Code:
2002Sci...297.1336G

Abstract

Populations of the garter snake Thamnophis sirtalis have evolved geographically variable resistance to tetrodotoxin (TTX) in a coevolutionary arms race with their toxic prey, newts of the genus Taricha. Here, we identify a physiological mechanism, the expression of TTX-resistant sodium channels in skeletal muscle, responsible for adaptive diversification in whole-animal resistance. Both individual and population differences in the ability of skeletal muscle fibers to function in the presence of TTX correlate closely with whole-animal measures of TTX resistance. Demonstration of individual variation in an essential physiological function responsible for the adaptive differences among populations is a step toward linking the selective consequences of coevolutionary interactions to geographic and phylogenetic patterns of diversity.
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