Local adaptation, intrinsic coadaptation and the effects of environmental stress on interpopulation hybrids in the copepod Tigriopus californicus
Local adaptation, intrinsic coadaptation and the effects of environmental stress on interpopulation hybrids in the copepod Tigriopus californicus
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DOI：
10.1016/j.jembe.2003.11.012
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发表时间：
2004-06-08
影响因子：
2
通讯作者：
Deimler, JK
中科院分区：
文献类型：
--
作者：
Edmands, S;Deimler, JK
不同种群间的杂交可能由于局部适应的破坏或内在共适应的破坏而导致适应度的降低。我们在加利福尼亚虎脚类动物身上测试了这两种效应。在纯种群和种群间杂交种中测定了适应度替代物，孵育在三种环境处理中分开：(1)标准：15℃/100%海水；(2)高温：25℃/100%海水；(3)低盐度：15度/50%海水。这些处理的效果是独立于人群的，没有提供局部适应的证据。纯种群体、F-1杂交种和F-2杂交种的平均适应度比较表明，杂交导致同一位点等位基因之间有益的相互作用和有害的相互作用（即内在共适应的破坏）。杂交的效果是依赖于环境的，暴露于最大的胁迫处理（高温）导致F-1杂种优势的维持和F-2分解的大幅减少。(C) 2004 Elsevier B.V.版权所有
Hybridization between divergent populations may cause a reduction in fitness due either to disruption in local adaptation or disruption in intrinsic coadaptation. We tested for both effects in the tidepool copepod Tigriopus californicus. Fitness surrogates were measured in pure populations and interpopulation hybrids, with broods split between three environmental treatments: (1) Standard: 15 degreesC/100% seawater; (2) High temperature: 25 degreesC/100% seawater; and (3) Low salinity: 15 degreesC/50% seawater. Effects of these treatments were independent of population, providing no evidence for local adaptation. Comparison of mean fitness in pure populations, F-1 hybrids and F-2 hybrids showed that hybridization caused beneficial interactions between alleles at the same locus and detrimental interactions between loci (i.e., disruption of intrinsic coadaptation). The effects of hybridization were environmentally dependent as exposure to the most stressful treatment (high temperature) resulted in the maintenance of F-1 heterosis and a substantial reduction in F-2 breakdown. (C) 2004 Elsevier B.V. All rights reserved.