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OALib Journal期刊
ISSN: 2333-9721
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洱海浮游桡足类群落结构对季节性休渔的响应
DOI: 10.3724/SP.J.1145.2012.00421, PP. 421-425
Keywords: 洱海,浮游桡足类,季节性休渔,群落结构
Abstract:
为了解洱海浮游桡足类群落结构的季节动态特征，于2009年2~11月对洱海浮游桡足类进行逐月采样.结果显示：洱海浮游桡足类生物量的季节性分布呈“双峰型”，峰值分别出现在休渔期中期和捕鱼期中期.在休渔期中期，桡足类以杂食性的剑水蚤mesocyclopsdissimilis为优势种；在捕鱼期中期，则以滤食性的哲水蚤舌状叶镖水蚤为优势种.季节性休渔不仅导致鱼类对桡足类的捕食压力出现季节性变化，而且通过影响枝角类的群落结构，改变枝角类对桡足类的竞争压力.在相对较低的捕食压力和较大的食物竞争压力影响下，桡足类以杂食性的剑水蚤为优势类群；在相对较大的捕食压力和较低的食物竞争压力下，以滤食性的哲水蚤为优势类群.
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