Genotype‐by‐Environment Interaction for Salinity Tolerance in the Freshwater‐Invading Copepod Eurytemora affinis
Genotype‐by‐Environment Interaction for Salinity Tolerance in the Freshwater‐Invading Copepod Eurytemora affinis
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淡水耐盐性的基因型——环境相互作用——入侵桡足类Eurytemora affinis
DOI：
10.1086/343138
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发表时间：
2002
影响因子：
1.6
通讯作者：
Petersen, Christine H.
中科院分区：
文献类型：
--
作者：
Lee, Carol Eunmi;Petersen, Christine H.
本研究探讨了入侵桡足类Eurytemora affinis.Euryemora affinisis的耐盐性和可塑性的遗传变异的表型可塑性的程度，一个复杂的物种栖息在半咸到高盐环境，但在过去的世纪内入侵淡水湖泊和水库。反应规范实验进行了一个相对广盐性的人口从一个咸水湖盐度波动。生活史性状（孵化率，存活率和发育时间）进行了测量20个全同胞窝，分裂和饲养在四个盐度（新鲜，5，10，和27实用盐度单位[PSU]）。平均而言，较高的盐度（10和27 PSU）更有利于幼虫的生长，产生更大的存活率和更快的发育速度。离合器显着不同，在他们的反应盐度，与显着的基因型与环境的相互作用的发展时间。此外，遗传（离合器）的影响是明显的，在低盐度，鉴于在淡水（湖）水的生存显着正相关，生存在5 PSU的个别离合器。在淡水中提出的离合器不能生存超过变态，这表明淡水的驯化不可能发生在一个单一的世代。结果表明，在淡水入侵事件中的自然选择的重要性，由于可塑性无法产生淡水表型，和存在的遗传变异的可塑性，自然选择可以采取行动。
This study examined the extent of phenotypic plasticity for salinity tolerance and genetic variation in plasticity in the invasive copepodEurytemora affinis.Euryemora affinisis a species complex inhabiting brackish to hypersaline environments but has invaded freshwater lakes and reservoirs within the past century. Reaction norm experiments were performed on a relatively euryhaline population collected from a brackish lake with fluctuating salinity. Life history traits (hatching rate, survival, and development time) were measured for 20 full‐sib clutches that were split and reared at four salinities (fresh, 5, 10, and 27 practical salinity units [PSU]). On average, higher salinities (10 and 27 PSU) were more favorable for larval growth, yielding greater survival and faster development rate. Clutches differed significantly in their response to salinity, with a significant genotype‐by‐environment interaction for development time. In addition, genetic (clutch) effects were evident in response to low salinity, given that survival in fresh (lake) water was significantly positively correlated with survival at 5 PSU for individual clutches. Clutches raised in fresh water could not survive beyond metamorphosis, suggesting that acclimation to fresh water could not occur in a single generation. Results suggest the importance of natural selection during freshwater invasion events, given the inability of plasticity to generate a freshwater phenotype, and the presence of genetic variation for plasticity upon which natural selection could act.