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首页> 外文期刊>Marine ecology progress series >Spatial variation in otolith chemistry of Atlantic croaker larvae in the Mid-Atlantic Bight
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Spatial variation in otolith chemistry of Atlantic croaker larvae in the Mid-Atlantic Bight

机译：大西洋中部大西洋大西洋黄花鱼幼虫耳石化学的空间变化

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Larval Atlantic croaker Micropogonias undulatus (1 to 7 mm in standard length) were collected on the east coast of the United States from North Carolina to Delaware during 2000. We defined 3 water-mass boundaries for potential groups of spawning Atlantic croaker using temperature and salinity measured at each sampling station. We tested the hypothesis that distinct otolith chemistries existed among 3 groups of larval Atlantic croaker collected from these water masses using solution-based inductively coupled plasma-mass spectrometry. Multivariate analysis of variance indicated that otolith chemistry differed significantly among water masses. Using a guadratic discriminant function, we were able to correctly classify fish from the Mid-Atlantic Bight (MAB) 73% of the time, South Atlantic Bight (SAB) 53 % of the time, and Chesapeake Bay plume 36 % of the time. The correct reclassification rates observed were significantly better than random. Results from this study indicate that it is possible to obtain measurable elemental concentrations from otoliths much smaller than previously analyzed (weight 0.015 to 1.976 μg). Moreover, contrary to previous studies, our results indicate that it is possible to distinguish natal signatures among larvae on different spawning grounds in the MAB and SAB. Further, this new information could benefit investigations of dispersal from offshore spawning grounds to estuaries or other nursery habitats.
机译：幼体大西洋黄花鱼Micropogonias undulatus（标准长度为1至7毫米）是在2000年从美国北海岸从北卡罗莱纳州到特拉华州收集的。我们使用温度和盐度为产卵大西洋黄花鱼的潜在群体定义了3个水质边界在每个采样站进行测量。我们测试了使用基于溶液的电感耦合等离子体质谱法从这些水团中收集的三组幼体大西洋黄花鱼中存在不同的耳石化学的假设。多变量方差分析表明，耳石化学在水团之间有显着差异。使用二次判别函数，我们能够在73％的时间内正确分类来自中大西洋海岸线（MAB），53％的南大西洋海岸线（SAB）和36％的切萨皮克湾羽羽的鱼类。观察到的正确重分类率明显好于随机。这项研究的结果表明，有可能从耳石中获得可测量的元素浓度，该浓度远小于先前分析的重量（0.015至1.976μg）。此外，与以前的研究相反，我们的结果表明可以在MAB和SAB中不同产卵场的幼虫之间区分出生特征。此外，这一新信息可能有益于调查从近海产卵场到河口或其他苗圃栖息地的扩散。

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