【摘要】 2016年5～6月对汉江上游平川段11个采样点开展鱼类多样性及水环境因子调查,共采集鱼类29种,隶属于3目5科25属,其中鲤科鱼类最多(21种,物种占比72.41%),其次为鳅科(5种,物种占比17.24%)。汉江上游平川段鱼类鱼种多样性水平分布呈现中间段低两端段高的特点,鱼类多样性垂直分布符合随海拔升高物种多样性指数下降的规律。采用非度量多维标度排序(NMDS)和典范对应分析方法(CCA)分析了鱼类群落空间分布特征及水环境因子对鱼类群落格局的影响。NMDS结果显示该河段各个站点鱼类群落分布并未出现明显的聚类特征。CCA分析结果表明水环境因子中电导率,五日生化需氧量,pH和硫酸盐浓度对平川段鱼类群落结构有极显著的影响。更多还原

【Abstract】 An investigation of fish composition and biodiversity in Pingchuan section of the upper reaches of Hanjiang River was made in May-June, 2016. A total of 29 species were collected, belonging to 25 genera, 5 families, and 3 orders. Cyprinidae was most abundant(21 species, 74.41% of the total species), followed by Loach(5 species, 17.24% of the total species). The horizontal distribution of fish species diversity appears rare in the middle section and abundant in the upper and lower sections. The vertical distribution of fish diversity according to the regular pattern that species diversity decreases when altitude increases. The method of non-metric multidimensional scale sorting(NMDS) was used to analyze the distribution characteristic of fish communities. Canonical correspondence analysis(CCA) was used to analyze the relationship between fish spatial distribution pattern and water environmental factors. NMDS showed that there were no obvious clustering characteristics in the fish population distribution at each station. CCA analysis showed that the community structure of fish was effected by the conductivity of water biochemical oxygen demand in five days, pH and sulfate concentration remarkable(all P<0.01) in Pingchuan section of Hanjiang River.更多还原