A quantitative genetic approach to assess the evolutionary potential of a coastal marine fish to ocean acidification
A quantitative genetic approach to assess the evolutionary potential of a coastal marine fish to ocean acidification
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评估沿海海洋鱼类对海洋酸化的进化潜力的定量遗传方法
DOI：
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发表时间：
2015
影响因子：
4.1
通讯作者：
H. Baumann
中科院分区：
文献类型：
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作者：
A. Malvezzi;C. Murray;K. Feldheim;J. DiBattista;D. Garant;C. Gobler;D. Chapman;H. Baumann
评估海洋生物从基因上适应不断增加的海洋二氧化碳水平的潜力需要替代指标，如海洋酸化(OA)下与适应相关的特征的遗传力。我们应用数量遗传学方法得出了第一个后生动物在高二氧化碳条件下生存的遗传力估计。具体地说，我们从野生沿海鱼类种群(大西洋银鱼)中挑选出后代，在高二氧化碳条件下(~2300μatm)从受精到孵化后15天饲养后代，与对照组相比，这显著降低了存活率。对死亡和存活的后代与其双亲进行定量采样和基因分型，利用8个多态微卫星基因座重建亲子系并估计方差分量。与遗传相关的个体相比，遗传相关的个体在表型上更相似(即，在高二氧化碳条件下存活的时间相似)，这转化为显著的非零遗传力(0.20±0.07)。母性效应的贡献出奇地小(0.05±0.04)且不显著。重复之间的存活率与遗传多样性呈正相关，特别是与观察到的杂合度呈正相关。我们的结论是，在高二氧化碳水平下，门氏支原体的早期生命存活具有显著的加性遗传成分，这可能会引发对OA的进化反应，这取决于未来选择的强度和方向。
Assessing the potential of marine organisms to adapt genetically to increasing oceanic CO2 levels requires proxies such as heritability of fitness‐related traits under ocean acidification (OA). We applied a quantitative genetic method to derive the first heritability estimate of survival under elevated CO2 conditions in a metazoan. Specifically, we reared offspring, selected from a wild coastal fish population (Atlantic silverside, Menidia menidia), at high CO2 conditions (~2300 μatm) from fertilization to 15 days posthatch, which significantly reduced survival compared to controls. Perished and surviving offspring were quantitatively sampled and genotyped along with their parents, using eight polymorphic microsatellite loci, to reconstruct a parent–offspring pedigree and estimate variance components. Genetically related individuals were phenotypically more similar (i.e., survived similarly long at elevated CO2 conditions) than unrelated individuals, which translated into a significantly nonzero heritability (0.20 ± 0.07). The contribution of maternal effects was surprisingly small (0.05 ± 0.04) and nonsignificant. Survival among replicates was positively correlated with genetic diversity, particularly with observed heterozygosity. We conclude that early life survival of M. menidia under high CO2 levels has a significant additive genetic component that could elicit an evolutionary response to OA, depending on the strength and direction of future selection.
影响因子：
18.3
作者：
Lohbeck, Kai T.;Riebesell, Ulf;Reusch, Thorsten B. H.
通讯作者：
Reusch, Thorsten B. H.