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乳山湾外海夏季大型底栖动物分布与环境因子的典范对应分析

DOI: 10.3724/SP.J.1145.2012.00599, PP. 599-604

Keywords: 大型底栖动物,环境因子,典范对应分析,乳山湾外海

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Abstract:

应用典范对应分析(canonicalcorrespondenceanalysis,cca)研究了乳山湾外海21个样点中的32种大型底栖动物与包括化学耗氧量、溶解氧等在内的11个沉积物和底层水体环境因子间的相关关系.作出种类分布与环境因子关系的二维排序图,排序图直观地反映了主要大型底栖动物种类分布与环境因子间的关系.排序图中环境因子与前两个排序轴的相关系数大小表明,总氮、溶解氧、盐度、ph、水深和总磷是影响乳山湾外海大型底栖动物群落分布的主导因素.排序图还揭示了大型底栖动物物种对生态环境的需求以及它们在不同资源维上的生态分化现象,不同生境中大型底栖动物分布的种类不同.根据对环境因子的生态需求不同,32种大型底栖动物可分为6组:组ⅰ,8种,分布在高总氮生境;组ⅱ,4种,分布在高溶解氧、高盐度、低总氮生境;组ⅲ,10种,分布在水浅、高ph生境;组ⅳ,4种,分布在水深、低ph生境;组ⅴ,仅1种,分布在高总磷生境;组ⅵ,5种,分布在水深、低总磷生境.图2表5参29关键词clc

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