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引用本文:张钰,谷孝鸿,何俊.太湖长刺溞对浮游植物摄食的生态学研究.湖泊科学,2008,20(1):100-104. DOI:10.18307/2008.0115
ZHANG Yu,GU Xiaohong,HE Jun.Feeding ecology of Daphnia longispina grazing on phytoplankton in Lake Taihu. J. Lake Sci.2008,20(1):100-104. DOI:10.18307/2008.0115
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太湖长刺溞对浮游植物摄食的生态学研究
张钰1,2, 谷孝鸿1, 何俊1,2
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;2.中国科学院研究生院, 北京 100049
摘要:
实验用食物浓度差减法研究了太湖长刺潘(Daphnia longispina)对浮游植物的摄食率及影响因素.在食物为原位湖水中的浮游植物,温度为20℃,光照为2.98×103lux(光暗比12:12)条件下,测得长刺潘对水柱中浮游植物的摄食率为0.0011-0.0245μg/(ind·h).长刺溞摄食率随其种群密度增大而先增后降,呈良好抛物线分布(R2为0.8836).长刺溞摄食率随食物浓度的增加而增大,呈良好的线性关系(R2=0.8586).长刺溞在黑暗条件下的摄食率高于光照条件下(P<0.05,t检验).长刺溞可有选择性地摄食栅列藻和小环藻等,选择指数分别为0.5425、0.5079,而对丝藻的选择指数为-0.7039.
关键词:  太湖  长刺溞  浮游植物  摄食率
DOI:10.18307/2008.0115
分类号:
基金项目:江苏省自然科学基金项目(BK2002148)资助
Feeding ecology of Daphnia longispina grazing on phytoplankton in Lake Taihu
ZHANG Yu1,2, GU Xiaohong1, HE Jun1,2
1.Stale Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Graduate School of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
Present/absence method(observed chlorophyll-a content of nature lake phytoplankton with and without addition of Daphnia)wereused to estimate grazing capacity of Daphnia longispina grazing on phytoplankton in Lake Taihu in April, 2006. The results showed thatthe ingesting rate was 0.0011-0.0245μg/(ind·h). There was very nice regression connection between density of D. longispina andingesting rate(R2=0.8836). It was parabola which had maximum value. The ingesting rate of D. longispina and food concentration had alinearity connection(R2=0.8586). The ingesting rate of D. longispina in the present experiments was higher in the dark groups than that ofthe light groups(P<0.05, test).D. longispina grazed most effectively on phytoplankton such as Scenedesmus and Cyclotella, the selectivefeeding indices were 0.5425 and 0.5079. However, D. longispina did not like to eat Ulothrix, the selective feeding index was -0.7039.
Key words:  Lake Taihu  Daphnia longispina  phytoplankton  ingesting rate
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