Local adaptation in shell shape traits of a brooding chiton with strong population genomic differentiation

被引:3
|
作者
Salloum, Priscila M. [1 ,2 ,5 ]
Lavery, Shane D. [1 ,3 ]
de Villemereuil, Pierre [4 ]
Santure, Anna W. [1 ]
机构
[1] Univ Auckland, Sch Biol Sci, Auckland, New Zealand
[2] Univ Otago, Dept Zool, Dunedin, New Zealand
[3] Univ Auckland, Inst Marine Sci, Leigh Marine Lab, Warkworth, New Zealand
[4] Sorbonne Univ, Univ Antilles, Ecole Prat Hautes Etud PSL,MNHN,CNRS, Inst Systemat Evolution Biodiversite ISYEB, Paris, France
[5] Univ Auckland, Sch Biol Sci, Thomas Bldg,3a Symonds St, Auckland 1010, New Zealand
关键词
local adaptation; Onithochiton neglectus; P-ST-F-ST comparisons; shell shape; R-PACKAGE; MOLLUSCA POLYPLACOPHORA; Q(ST)-F-ST COMPARISONS; LITTORINA-SAXATILIS; GENETIC-ANALYSIS; NEW-ZEALAND; F-ST; EVOLUTIONARY; DIVERGENCE; MORPHOLOGY;
D O I
10.1093/evolut/qpac011
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Comparing divergence in quantitative traits and neutral molecular markers, such as Q(ST)-F-ST comparisons, provides a means to distinguish between natural selection and genetic drift as causes of population differentiation in complex polygenic traits. Onithochiton neglectus (Rochebrune, 1881) is a morphologically variable chiton endemic to New Zealand, with populations distributed over a broad latitudinal environmental gradient. In this species, the morphological variants cluster into 2 geographically separated shell shape groups, and the phenotypic variation in shell shape has been hypothesized to be adaptive. Here, we assessed this hypothesis by comparing neutral genomic differentiation between populations (F-ST) with an index of phenotypic differentiation (P-ST). We used 7,562 putatively neutral single-nucleotide polymorphisms (SNPs) across 15 populations and 3 clades of O. neglectus throughout New Zealand to infer F-ST. P-ST was calculated from 18 shell shape traits and gave highly variable estimates across populations, clades, and shape groups. By systematically comparing P-ST with F-ST, we identified evidence of local adaptation in a number of the O. neglectus shell shape traits. This supports the hypothesis that shell shape could be an adaptive trait, potentially correlated with the ability to live and raft in kelp holdfasts.
引用
收藏
页码:210 / 220
页数:11
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