2009年夏季和2012年夏季对秦皇岛入海口邻近海域大型底栖动物群落进行调查,并对大型底栖动物群落结构变化及影响因子进行了研究分析。结果表明:(1)2009年和2012年调查海区大型底栖动物种类组成皆以多毛类和节肢动物为主,物种数和丰度皆呈现由近岸向外海递增的趋势。与2009年相比,2012年大型底栖动物种类数有所减少,优势种种类变化较大,但物种优势度变化不明显。(2)2009年和2012年调查海域大型底栖动物的总生物量组成变化明显,各生态类群的优势地位出现了明显更替。(3)2009年大型底栖动物可划分为3个群落,2012年大型底栖动物可划分为4个群落。两次调查中不同群落类型之间大型底栖动物组成皆呈显著性差异,群落不相似性主要贡献者差异性较大。(4)根据BIOENV和BVSTEP分析结果表明,2009年影响大型底栖动物群落结构的主要环境因子是水深和无机磷含量;2012年影响大型底栖动物群落结构的主要环境因子是水深、盐度和沉积物有机碳含量。
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