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首页> 外文期刊>Marine biology >Geostatistical analysis of densities of Liocarcinus depurator (Brachyura: Portunidae) on the western Mediterranean from 1994 to 2003
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Geostatistical analysis of densities of Liocarcinus depurator (Brachyura: Portunidae) on the western Mediterranean from 1994 to 2003

机译:1994年至2003年地中海西部净化器(Brachyura:Portunidae)密度的地统计学分析

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摘要

Bottom trawl estimates of densities of the portunid crab Liocarcinus depurator along the Mediterranean coast of Spain from 1994 to 2003, covering a depth range of 50-800 m, were analysed using non-linear geostatistical techniques. The variation of the spatial distribution was modelled through variogram analysis using depth as a covariate. Patch size ranged from 20 to 75 km. Crab density showed a general decrease from 1994 to 2003. L. depurator high-density areas were characterised as either occasional or permanent (always present every year). High-density patches appeared to be associated with either upwelling or strong river influence, i.e. the Western Alboran Sea and the Ebro Delta. The application of non-linear geostatistical techniques proved useful in identifying permanent high-density population patches, thereby highlighting regions of special interest for the ecology of the species.
机译:使用非线性地统计技术分析了1994年至2003年西班牙地中海沿岸的Portunid蟹Liocarcinus净化器的底部拖网密度,其覆盖范围为50-800 m。通过使用深度作为协变量的方差图分析对空间分布的变化进行建模。斑块大小从20到75公里不等。从1994年到2003年,螃蟹密度总体上有所下降。净化器L. depurator高密度区域的特征是偶发的或永久的(每年都存在)。高密度斑块似乎与上升气流或强烈的河流影响有关,即西部阿尔伯兰海和埃布罗三角洲。事实证明,非线性地统计学技术的应用对于识别永久性高密度种群斑块很有用,从而突出了该物种生态学特别感兴趣的区域。

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