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首页> 外文期刊>Fisheries Oceanography >Spatial distribution of Greenland halibut Reinhardtius hippoglossoides in relation to abundance and hypoxia in the estuary and Gulf of St. Lawrence
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Spatial distribution of Greenland halibut Reinhardtius hippoglossoides in relation to abundance and hypoxia in the estuary and Gulf of St. Lawrence

机译：格陵兰大比目鱼Reinhardtius hippoglossoides的空间分布与河口和圣劳伦斯湾的丰度和缺氧量有关

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Annual bottom-trawl surveys (1990–2010) were used to examine associations between environmental conditions, spatial distribution, and size-specic abundance of Greenland halibut Reinhardtius hippoglossoides in the estuary and Gulf of St. Lawrence (EGSL), and to test the inuence of hypoxic conditions on habitat selection. Size classes representing juvenile, immature and adult sh were used for the analyses. The highest concentrations of sh were found in the St. Lawrence estuary at both high and low levels of stock abundance. The areas occupied by 50, 75, and 95% of juvenile sh expanded with higher population abundance. However, contrary to our predictions, densities in marginal habitats did not increase at a higher rate than in optimal habitats. Fish longer than 32 cm were distributed over a broader area than juvenile sh. Their abundance explained a limited proportion of the variability in spatial distribution. The spatial dynamics of Greenland halibut in the EGSL is best described by a proportional density model where the rate of increase in local density is associated with population abundance. Habitats selected by Greenland halibut were characterized by low dissolved oxygen (DO) levels. The strong association between high sh densities and low DO concentrations indicates a high tolerance of Greenland halibut to hypoxia. It also indicates that negative effects, if present, could be compensated by other factors such as food availability and or refuge from predation. The results of this study also clearly dene the St. Lawrence estuary as the major nursery area for the EGSL population..
机译：年度底拖网调查（1990年至2010年）用于检查环境条件，空间分布以及河口和圣劳伦斯湾（EGSL）的格陵兰大比目鱼Reinhardtius hippoglossoides的特定大小丰度之间的关联，并测试其影响。氧条件对生境选择的影响。分析使用代表青少年，未成熟和成年sh的尺寸等级。在圣劳伦斯河口发现高含量和低含量的高含量sh。随着人口数量的增加，由50％，75％和95％的少年所占的面积扩大了。但是，与我们的预测相反，边缘生境的密度没有以比最佳生境更高的速率增加。长于32厘米的鱼比幼鱼分布的区域更大。它们的丰富性解释了空间分布变化的有限比例。 EGSL中格陵兰大比目鱼的空间动力学最好用比例密度模型来描述，在该模型中，局部密度的增加速率与种群数量相关。格陵兰大比目鱼选择的栖息地的特征是低溶解氧（DO）水平。高sh密度和低DO浓度之间的强烈关联表明格陵兰大比目鱼对缺氧的高度耐受性。它还表明，负面影响（如果存在）可以通过其他因素来补偿，例如食物供应和/或被捕食避难。这项研究的结果也明确地将圣劳伦斯河口定为EGSL人口的主要苗圃地区。

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