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首页> 外文期刊>Marine biology >Population structure and life history of orange roughy (Hoplostethus atlanticus) in the SW Pacific: inferences from otolith chemistry
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Population structure and life history of orange roughy (Hoplostethus atlanticus) in the SW Pacific: inferences from otolith chemistry

机译：西南太平洋橙色rough鱼（Hoplostethus atlanticus）的种群结构和生活史：耳石化学的推论

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摘要

We examined site differences in the elemental composition of the primordium and ontogenetic variability of Sr in otoliths of fish from Australia and New Zealand and, as an out-group, the North Atlantic. Differences among sites in primordium composition are slight, but significant for all five elements assayed (Sr, Pb, Cu, Zn and Hg), but principally reflect differences between the North Atlantic and SW Pacific specimens, do not replicate for independent samples in the SW Pacific and constitute a poor "natural tag" in roughy, with ＜ 25% of fish successfully assigned to source location. However, mean Sr weight-fractions at the primordium showed similar latitudinal variation across sites in Australia, New Zealand and the Tasman Sea, indicating both spatially structured populations and a common structuring process across the region. Comparisons of ontogenetic variability of Sr in otoliths from juveniles and young adults within and between sites in the SW Pacific strongly support the hypothesis that variability in this element is site-specific and environmentally sensitive, although the environmental factors involved are not obvious. The otolith analysis confirms previous suggestions that juvenile and adult Hoplostethus atlanticus are relatively sedentary, but also indicates that the population sub-structuring by age within sites is more complex and there are likely to be more spawning areas in Australian waters than previously thought. More broadly, although single point analysis of otolith composition at the primordium resolves a population structure in roughy, alone it is not precise enough to test hypotheses about the processes causing thisrnstructure. Ontogenetic variability in Sr provides better resolution of spatial structure, even in a relatively homogenous marine environment like the deep ocean, and also provides insight into behavioural and ecological factors. Ontogenetic analyses of Sr in otoliths are expensive to obtain, require more effort in specimen preparation than single point analyses, and are difficult to compare statistically, but the increased information they yield warrants their broader consideration in marine species.
机译：我们检查了原产地的元素组成和Sr在澳大利亚和新西兰以及作为外来群体的北大西洋鱼类耳石中的Sr遗传变异的位点差异。原基组成中各位点之间的差异很小，但对所有五种元素（Sr，Pb，Cu，Zn和Hg）均显着，但主要反映了北大西洋和西南太平洋标本之间的差异，对于西南部的独立样品不重复太平洋地区，构成了粗糙的“天然标签”，其成功分配给来源地的鱼类少于＜25％。然而，在澳大利亚，新西兰和塔斯曼海的不同地点，原基上的平均Sr重量分数显示出类似的纬度变化，表明该地区的空间结构种群和共同的构造过程。在西南太平洋各地点内和之间，少年和年轻人的耳石中Sr的个体发育变异性比较强烈支持以下假设：尽管涉及的环境因素并不明显，但该元素的变异性是特定于地点且对环境敏感的。耳石分析证实了先前的建议，即幼年和成年的大西洋霍普氏te属较为久坐，但也表明，按地点划分的种群亚结构更为复杂，在澳大利亚水域产卵的地区可能比以前想象的要多。更广泛地讲，尽管对原基上耳石成分的单点分析可以粗略地解决种群结构，但仅凭其精确性还不足以检验有关导致这种结构的过程的假设。 Sr的自成因变异性可以提供更好的空间结构分辨率，即使在相对同质的海洋环境（如深海）中，也可以洞察行为和生态因素。耳石中Sr的本体遗传学分析成本高昂，比单点分析需要更多的样品前处理工作，并且难以进行统计学比较，但是它们产生的信息增加值得在海洋物种中进行更广泛的考虑。

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