Evidence for morphometric differentiation of wild and captively reared adult coho salmon: a geometric analysis
Evidence for morphometric differentiation of wild and captively reared adult coho salmon: a geometric analysis
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DOI：
10.1023/a:1007646332666
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发表时间：
2000-05-01
影响因子：
1.4
通讯作者：
Parker, LT
中科院分区：
文献类型：
--
作者：
Hard, JJ;Berejikian, BA;Parker, LT
作为一个全面的遗传评估的繁殖在自然产卵银鲑，Oncorhynchus kisutch的一部分，我们研究了形态测量变异圈养饲养和野生成人从胡德运河，华盛顿（美国）。以证明这些群体之间的差异。我们收集圈养饲养的鱼parr从两个股票和饲养到成年期的淡水孵化场，成熟于1995年和1996年，我们采样密切匹配的大小野生鱼，因为他们在这两年返回到邻近的流。多变量分析的形状变化的Procrustes坐标，可视化薄板样条，表明圈养成年人区分野生鱼类急剧减少性二型性，以及较小的头部和钩口鼻部，躯干深度增加，较大的尾梗，较短的背鳍，较大的后躯和减少身体流线型。人工饲养和野生鱼之间的差异类似，但更明显的一些差异比以前报道的孵化场和野生银鲑。差异的程度和模式表明，其中至少有一些是环境引起的。形状的变化表现出异速生长的关系，在身体的变化（质心测量）的大小。形态变异与大多数产卵行为的相关性较差。然而，我们的研究结果表明，圈养繁殖的择偶和繁殖活动的产卵鱼的形态学后果可能会限制其作为一种恢复工具的有效性。
As part of a comprehensive genetic evaluation of reproduction in naturally spawning coho salmon, Oncorhynchus kisutch, we examined morphometric variation in captively reared and wild adults from Hood Canal, Washington (U.S.A.) for evidence of differentiation between these groups. We collected captively reared fish as parr from two stocks and reared to adulthood at a freshwater hatchery, maturing in 1995 and 1996; we sampled closely size-matched wild fish as they returned to a neighboring stream in both years. Multivariate analysis of shape variation by Procrustes coordinates, visualized by thin-plate splines, indicated that the captively reared adults were differentiated from the wild fish by sharply reduced sexual dimorphism as well as smaller heads and less hooked snouts, increased trunk depth, larger caudal peduncles, shorter dorsal fins, larger hindbodies and a reduction in body streamlining. The differences between the captively reared and wild fish were similar to but more pronounced than some differences previously reported between hatchery and wild coho salmon. The magnitude and pattern of differences suggested that at least some of them were environmentally induced. Shape variation showed an allometric relationship with variation in body (measured as centroid) size. Morphometric variation was a poor correlate of most spawning behaviors. Nevertheless, our results suggest that the morphometric consequences of captive rearing for mate selection and reproductive activity of spawning fish may limit its effectiveness as a restorative tool.