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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial structure and abundance of the sea urchin Paracentrotus lividus in subtidal fishing grounds of the Galician coast (NW- Spain)
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Spatial structure and abundance of the sea urchin Paracentrotus lividus in subtidal fishing grounds of the Galician coast (NW- Spain)

机译：在加利西亚海岸的阴影捕鱼地区的海胆海胆海胆海胆（NW-西班牙）的空间结构和丰富

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摘要

A combination of field data and statistical data analysis was used to assay the spatial heterogeneity and abundance of the echinoderm Paracentrotus lividus, a target species of a small-scale-fishery located in Galicia (NW Spain). The mean density estimated in two commercial fishing grounds sampled in this study were 0.72 and 0.9 ind./m(2). Both fishing grounds showed substantial patchiness, with over 75% of the sampling area containing densities between 0 and 2 ind/m(2). Fishing caused a considerable decrease in the density and abundance of commercial-sized individuals. Results showed that fishing activity was highly influenced by the spatial heterogeneity of P. lividus with fishers mainly operating in patches equal to or over 1.4 ind./m(2). This fact entails a higher risk of overexploitation, since densest populations may show the highest reproductive potential. The estimated total mortality rates (Z similar to 0.75) represented a depletion of 54% of the stock, reaching 64% in areas where fishing activity is concentrated. These results indicated that the sea urchin stock should be managed at the patch scale rather than the stock scale. This kind of management would prevent inconsistency between biological and exploitable scales.
机译：现场数据和统计数据分析的组合用于测定海螺酰胺帕吻菌的空间异质性和丰度，Lividus的一只小型渔业的靶种类（NW Spain）。在本研究中采样的两种商业捕鱼场中估计的平均密度为0.72和0.9 Ind./m（2）。捕鱼地面都显示出大量斑块，超过75％的含有含有0和2 Ind / M（2）的密度的采样区域。钓鱼导致商业大小的人的密度和丰富程度相当下降。结果表明，捕捞活动受到P. Lividus的空间异质性的影响，渔民主要在等于或超过1.4 Ind./m（2）的斑块中。这一事实需要更高的过度风险，因为最密度的群体可能显示出最高的生殖潜力。估计的总死亡率（Z类似于0.75）代表耗尽54％的库存，捕捞活性集中的区域达到64％。这些结果表明，海胆股票应在补丁量表而不是股票规模的情况下管理。这种管理将防止生物和可利用程度之间的不一致。

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