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首页> 外文期刊>ICES Journal of Marine Science >Pelagic fish abundance in relation to regional environmental variation in the Gulf of Finland, northern Baltic Sea
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Pelagic fish abundance in relation to regional environmental variation in the Gulf of Finland, northern Baltic Sea

机译：芬兰湾，波罗的海北部中上层鱼类的丰富度与区域环境变化的关系

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摘要

This study applies variation partitioning to analyse spatial patterns in hydroacoustic estimates of fish abundance in relation to regional variation in the hydrography, food resources, and geography of the Gulf of Finland, northern Baltic Sea. Using variation partitioning based on generalized additive models, daily fluctuations in hydroacoustic abundance estimates were first eliminated, and the remaining variation in fish abundance was decomposed into independent and joint effects of hydrography, food resources, and geography. The independent effect of geographic variables (spatial location and water depth) captured the largest fraction of the variation (9.3%) in the fish-abundance patterns, whereas the independent effects of hydrography (5.8%) and food resources (5.6%) captured slightly less. However, a considerable portion of the variation in fish-abundance patterns was accounted for by the joint effects of explanatory variables and may therefore be causally related to two or all three groups of variables. The model applied efficiently eliminated the spatial autocorrelation in the fish abundance between sampling units, especially at distances > 2000 m. At smaller scales, the residual autocorrelation may have been due to fish behavioural patterns independent of the explanatory variables in this analysis.
机译：这项研究应用变化分区来分析鱼类丰度的水声估计中与波罗的海北部芬兰湾的水文，粮食资源和地理区域变化有关的空间格局。使用基于广义加性模型的变异划分，首先消除了水声丰度估计值的每日波动，并将剩余的鱼类丰度变化分解为水文，食物资源和地理的独立影响和共同影响。地理变量（空间位置和水深）的独立影响捕获了鱼类丰度模式变化的最大部分（9.3％），而水文学（5.8％）和粮食资源（5.6％）的独立影响则微弱减。但是，鱼类多度型态变化的很大一部分是由解释变量的共同作用造成的，因此可能与两组或全部三组变量有因果关系。所应用的模型有效地消除了采样单元之间鱼丰度的空间自相关，尤其是在距离> 2000 m时。在较小的尺度上，残余自相关可能是由于鱼类行为模式所致，而该行为与本分析中的解释变量无关。

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