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湖泊科学  2009 

一座抽水水库中中华窄腹剑水蚤种群动态及其对浮游甲壳类群落结构的影响

DOI: 10.18307/2009.0114

Keywords: 中华窄腹剑水蚤,浮游甲壳类,优势种,抽水水库,大镜山水库

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Abstract:

中华窄腹剑水蚤是中国河流中发现的上著种类,具有较强的生态入侵能力,通过从西江抽水进入大镜山水库,成为该水库的优势浮游甲壳类.通过2005-2006两年的采样监测,初步分析了该水库中中华窄腹剑水蚤的种群特征及其对浮游甲壳类的群落动态和结构的影响.两年共检出浮游甲壳类13种,其中,桡足类4科7属9种,枝角类3科4属4种,中华窄腹剑水蚤是水库的优势种.两年浮游甲壳类丰度的范围是3.82-364.85ind./L,峰值出现在春季、两年变化趋势相似.水库浮游甲壳类的体长分布范围为0.07-1.25mm,主要由小个体的类群(体长在0.07-0.4mm之间)组成,个体较大(大于0.5mm)的枝角类和桡足类数量很低.中华窄腹剑水蚤和其无节幼体的丰度占甲壳类总丰度的50%以上,其丰度的动态分布与浮游甲壳类的总体丰度的动态分布一致.中华窄腹剑水蚤主要以三种形式(无节幼体Ⅰ期,桡足幼体后期和成体)存在于水体中,存活曲线呈Ⅲ型,无节幼体的丰度远高于后两者之和.该种类能成为水库优势种主要是南水库咸度变化剧烈水环境特征和其自身的生态学特点决定的.中华窄腹剑水蚤丰度与叶绿素a浓度具有显著正相关性,与抽水入库量具有极显著的负相关性.作为一个生态入侵种类,中华窄腹剑水蚤降低水体中浮游甲壳类生物多样性,并替代了原来的土著优势种.

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