浙江饮用水源地浮游动物体积多样性及水质响应

为了解浙江饮用水源地浮游动物体积多样性及对水体综合营养状态（TLIc值）的响应特征，对16个饮用水源地（H1-H8为河网型，K1-K8为水库型）展开了水质参数、浮游动物群落生物体积及其多样性指数的季节调查。结果表明，生物体积密度的季节变化以1月（0.681 mL/L）> 4月（0.443 mL/L）> 10月（0.252 mL/L）> 7月（0.229 mL/L），各季的第一优势种分别为汤匙华哲水蚤（Sinocalanus dorrii）（1月）、晶囊轮虫（Asplanchna sp.）（4月）、粗壮温剑水蚤（Thermocyclops dybowskii）（7月）和长额象鼻溞（Bosmina longirostris）（10月）。河网浮游动物生物体积以轮虫（44.6%）和枝角类（23.4%）为主，水库则以哲水蚤（39.5%）和轮虫（29.0%）为主。夏秋季浮游动物体积多样性指数（P < 0.01）和物种多样性指数（P < 0.05）与lg（浮游动物/浮游植物生物量比率）lg（ZB:PB）]之间均有显著的相关性，水库中仅浮游甲壳动物体积多样性指数与lg（ZB:PB）之间有极其紧密的相关性（R2=0.77）。与物种多样性指数响应环境效应相比，甲壳动物的体积多样性指数（P < 0.01）能更好地指示夏秋季河网的TLIc值，这归因于甲壳动物个体数（ind./L）转换成了生物体积密度（mL/L）过程中有效信息的放大。

A PRELIMINARY STUDY ON SIZE DIVERSITY OF ZOOPLANKTON AND THEIR ASSOCIATION WITH TROPHIC LEVEL IN THE DRINKING WATER SOURCES,ZHEJIANG PROVINCE

In order to understand the size diversities of the zooplankton community and response characteristics of the comprehensive water bodies by trophic level index (TLIc value), a seasonal investigation was conducted on zooplank-ton size diversities from two types of 16 drinking water sources (H1-H8 for rivers, K1-K8 for reservoirs) from January to October 2011 in Zhejiang Province. The results showed that seasonal variations in the biovolume density of zoo-plankton from high to low were January (0.681 mL/L), April (0.443 mL/L), October (0.252 mL/L), and July (0.229 mL/L). The first dominant species of January, April, July, and October wereSinocalanus dorrii,Asplanchna sp.,Thermocyc-lops dybowskii, andBosmina longirostris respectively. Zooplankton were mainly Rotifera (44.6%) and Cladocera (23.4%) in the rivers by their biological volume, while Calanoida (39.5%) and Rotifera (29.0%) in the reservoirs. There were significant relationships between lg 10 transformed zooplankton/phytoplankton biomass ratio lg (ZB:PB)] and size diversi-ties (P<0.01) or species diversities (P<0.05) of zooplankton in the drinking water sources during summer and autumn, and crustacean zooplankton size diversity index was significantly positive correlated with lg (ZB:PB) (R2=0.77) in the reservoirs. Crustaceans size diversity (P<0.01) were more reliable toTLIc value of the rivers than the species diversity during summer and autumn, supported by the useful information amplification from the numbers of crustaceans (ind./L) converting into biovolume density (mL/L).