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首页> 外文期刊>Marine ecology progress series >Otolith-based growth reconstructions in young-of-year Atlantic silversides Menidia menidia and their implications for sex-selective survival
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Otolith-based growth reconstructions in young-of-year Atlantic silversides Menidia menidia and their implications for sex-selective survival

机译：年幼的大西洋银sides Menidia menidia中基于耳石的生长重建及其对性别选择性生存的影响

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We examined the utility of otolith microstructure analysis in young-of-year (YoY) Atlantic silversides Menidia menidia, an important annual forage fish species along the North American Atlantic coast. We first compared the known hatch window of a local population (Long Island Sound, USA) to otolith-derived hatch distributions, finding that YoY collected in October were reliably aged, whereas survivors from November and December were progressively underaged, likely due to the onset of winter ring formation. In all collections, males outnumbered females, and both sexes had bimodal size distributions. However, while small and large females were almost evenly represented (similar to 60 and similar to 40%, respectively), over 94% of all males belonged to the small size group. We then examined increment widths as proxies for somatic growth, which suggested that bimodal size distributions resulted from 2 distinct slow- and fast-growing YoY phenotypes. Length back-calculations of October YoY confirmed this, because fast- and slow-growing phenotypes arose within common bi-weekly hatch intervals. We concluded that the partial sexual size dimorphism in this population resulted largely from sex-specific growth differences and not primarily from earlier female than male hatch dates, as predicted by the well-studied phenomenon of temperature-dependent sex determination (TSD) in this species. Furthermore, observed sex ratios were considerably less male-biased than reconstructed thermal histories and published laboratory TSD values predicted. Assuming that selective mortality is generally biased against slower growing individuals, this process would predominantly remove male silversides from the population and explain the more balanced sex ratios at the end of the growing season.
机译：我们研究了耳石微结构分析在年幼（YoY）大西洋银侧Menidia menidia中的效用，Midenia menidia是北美大西洋沿岸重要的年度觅食鱼类。我们首先将当地人口（美国长岛湾）的已知孵化窗口与耳石得出的孵化分布进行了比较，发现10月份收集的YoY年龄确实可靠，而11月和12月的幸存者逐渐衰老，可能是由于发病冬季形成环。在所有藏品中，男性人数多于女性人数，并且男女都有双峰大小分布。但是，虽然大小女性的比例几乎平均（分别接近60％和40％），但所有男性中超过94％属于小型群体。然后，我们检查了增量宽度作为体细胞生长的代理，这表明双峰大小分布是由2种不同的缓慢和快速增长的YoY表型产生的。十月份同比长度反算证实了这一点，因为在常见的每两周孵化间隔内出现了快速增长和缓慢增长的表型。我们得出的结论是，该种群中部分性别大小二态性很大程度上是由于特定性别的生长差异所致，而不是主要原因是该物种的温度依赖性性别决定（TSD）现象已得到充分研究，这是女性早于男性孵化的结果。此外，观察到的性别比例比重构的热史和预测的已公布实验室TSD值要低得多。假设选择性死亡率通常偏向于生长较慢的个体，则该过程将主要从种群中去除雄性银苷，并解释了生长季节结束时性别比例更加平衡的原因。

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