贵州百花湖麦西河河口后生浮游动物群落结构及与环境因子的关系

Community structure of metazooplankton and its relationship with environmental factors at the estuary of Maixi River in Lake Baihua

为了探明百花湖麦西河后生浮游动物的群落组成及动态特征,于2009年8月至2011年8月对百花湖麦西河河口后生浮游动物进行调查研究.结果表明:百花湖麦西河河口共监测到轮虫29种,丰度为0.16～837.80 ind./L;桡足类浮游动物仅检测到了温中剑水蚤(Mesocyclops thermocyclopoides)和猛水蚤(Harpacticella sp.)2种,以无节幼体和桡足幼体为主,其丰度为0～642.75 ind./L;枝角类浮游动物9种,丰度为0～31.20 ind./L.后生浮游动物的丰度主要由轮虫和桡足类组成,轮虫丰度比例为4.09%～100%,桡足类丰度比例为0～95.64%.前节晶囊轮虫(Asplanchna priodonta)、卜氏晶囊轮虫(Asplanchna brightwelli)、裂足臂尾轮虫(Brachionus diversicornis)为轮虫类的主要优势种,最高丰度分别达到424.88、392.20和61.99 ind./L;长额象鼻溞(Bosmina longirostris)为枝角类优势种,最高丰度达到27.93 ind./L.轮虫丰度与透明度、总氮、硝态氮呈极显著正相关;枝角类丰度与透明度、硝态氮呈极显著正相关,与温度呈极显著负相关.

In order to understand the dynamics and composition of metazooplankton community structure at the estuary of Maixi River in Lake Baihua, metazooplanktou was investigated from August 2009 to August 2011. The results showed that there were 29 rotifer species with abundance ranging from 0.16 to 837.80 ind./L. Only two kinds of copepoda, Mesocyclops therrnocyclopoides and Harpacticellu sp. were detected, the abundance range from 0 to 642.75 ind./L. 9 cladocera species were detected with abun- dances from 0 to 31.20 ind./L. Metazoan zooplankton abundance was mainly composed by rotifer and copepods. The proportion of rotifer abundance was from 4.09% to 100% , comparing to the percentage of copepods being from 0 to 95.64%. Asplanchna pri- odonta, Asplanchna brightwelli, Brachionus diversicornis were the dominant species for rotifer, whose highest abundance reached 424.88, 392.20 and 61.99 ind./L, respectively; Bosmina longirostris as the dominant specie of cladocera, with a maximum abundance of 27.93 ind./L. Rotifer abundance was significant positive related to transparency, total nitrogen, nitrate nitrogen; while cladocera abundance exhibited a significant positive correlation with transparency and nitrate nitrogen, but significant negative correlation with the temperature.