Parallel arms races between garter snakes and newts involving tetrodotoxin as the phenotypic interface of coevolution

被引:83
作者
Brodie, ED [1 ]
Feldman, CR
Hanifin, CT
Motychak, JE
Mulcahy, DG
Williams, BL
Brodie, ED [1 ]
机构
[1] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA
[2] Utah State Univ, Dept Biol, Logan, UT 84322 USA
基金
美国国家科学基金会;
关键词
coevolution; parallel evolution; resistance; Taricha; tetrodotoxin; TTX; Thamnophis; toxicity;
D O I
10.1007/s10886-005-1345-x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Parallel "arms races" involving the same or similar phenotypic interfaces allow inference about selective forces driving coevolution, as well as the importance of phylogenetic and phenotypic constraints in coevolution. Here, we report the existence of apparent parallel arms races between species pairs of garter snakes and their toxic newt prey that indicate independent evolutionary origins of a key phenotype in the interface. In at least one area of sympatry, the aquatic garter snake, Thamnophis couchii, has evolved elevated resistance to the neurotoxin tetrodotoxin (TTX), present in the newt Taricha torosa. Previous studies have shown that a distantly related garter snake, Thamnophis sirtalis, has coevolved with another newt species that possesses TTX, Taricha granulosa. Patterns of within population variation and phenotypic tradeoffs between TTX resistance and sprint speed suggest that the mechanism of resistance is similar in both species of snake, yet phylogenetic evidence indicates the independent origins of elevated resistance to TTX.
引用
收藏
页码:343 / 356
页数:14
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