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首页> 外文期刊>ICES Journal of Marine Science >Sardine potential habitat and environmental forcing off western Portugal
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Sardine potential habitat and environmental forcing off western Portugal

机译：沙丁鱼潜在的栖息地和环境迫使葡萄牙西部

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摘要

Relationships between sardine (Sardina pilchardus) distribution and the environment off western Portugal were explored using data from seven acoustic surveys (spring and autumn of 2000, 2001, 2005, and spring 2006). Four environmental variables (salinity, temperature, chlorophyll a, and acoustic epipelagic backscatter other than fish) were related to the acoustic presence and density of sardine. Univariate quotient analysis revealed sardine preferences for waters with high chlorophyll a content, low temperature and salinity, and low acoustic epipelagic backscatter. Generalized additive models depicted significant relationships between the environment and sardine presence but not with sardine density. Maps of sardine potential habitat (SPH) built upon the presence/absence models revealed a clear seasonal effect in the across-bathymetry and alongshelf extension of SPH off western Portugal. During autumn, SPH covered a large part of the northern Portuguese continental shelf but was almost absent from the southern region, whereas in spring SPH extended farther south but was reduced to a narrow band of shallow coastal waters in the north. This seasonal pattern agrees with the spatio-temporal variation of primary production and oceanic circulation described for the western Iberian shelf.
机译：沙丁鱼（Sardina pilchardus）分布与葡萄牙西部沿海环境之间的关系，是使用来自七个声学调查（2000年春季和秋季，2001年，2005年和2006年春季）的数据进行了研究。沙丁鱼的声学存在和密度与四个环境变量（盐度，温度，叶绿素a和鱼类以外的声学上表皮背向散射）有关。单变量商分析显示，沙丁鱼偏爱叶绿素a含量高，温度和盐度低且表皮上背向散射低的水。通用添加剂模型描述了环境与沙丁鱼存在之间的显着关系，但与沙丁鱼密度无关。基于存在/不存在模型建立的沙丁鱼潜在栖息地（SPH）地图揭示了SPH跨跨测深和沿陆架扩展的明显季节性影响（在葡萄牙西部以外）。秋季，SPH覆盖了北部葡萄牙大陆架的大部分，但南部地区几乎没有，而春季SPH延伸至更南端，但北部减少为狭窄的浅水带。这种季节性模式与西部伊比利亚陆架描述的初级生产和海洋环流的时空变化一致。

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