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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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香溪河水系大型底栖动物的群落结构及生态位
DOI: 10.3724/SP.J.1145.2009.00337, PP. 337-341
Keywords: 香溪河,大型底栖动物,生态位宽度,生态位重叠,群落结构
Abstract:
摘要2005年7月~2006年6月对三峡水库湖北库区最大支流香溪河的大型底栖动物进行定量采集，并对所得数据进行了数理统计分析及生态位分析.结果表明，香溪河水系大型底栖动物物种丰富度在不同季节、不同支流间差异均显著；密度在各季节间差异显著.四节蜉、高翔蜉、锯形蜉、朝大蚊和扁蜉生态位较宽；tetropinasp.、短尾石蝇、黑蝇生态位较窄.四节蜉、高翔蜉、锯形蜉、朝大蚊与其它分类单元生态位重叠值较大，黑蝇、短尾石蝇、直突摇蚊、tetropinasp.与其它分类单元生态位重叠值较小.相对丰度和生态位宽度对生态位重叠值有重要影响.大型底栖动物主要通过在资源位上的分布、生态位重叠值大小，以及摄食类群和生活型等的差异缓解竞争.图2表5参25
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