文章基本信息

标题：Predation by Larval Damselflies on Cladocerans
本地全文：下载
作者：Rebecca J. Hunt ; Michael Swift
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：2010
卷号：25
期号：3
页码：345-351
DOI：10.1080/02705060.2010.9664377
出版社：Taylor & Francis
摘要：We quantified the strike and capture efficiency, handling time, and functional response of Enallagma hageni and Ishnura verticalis larvae feeding on several sizes of the cladocerans Polyphemus pediculus, Daphnia pulex, and Holopedium gibberum. Both species were most efficient at capturing and ingesting P. pediculus, the smallest and most vulnerable prey, followed by D. pulex, a larger, faster prey. H. gibberum was rarely eaten due to a protective gelatinous sheath. The handling time was shortest for P. pediculus and longest for D. pulex due to a combination of size and carapace protection. Both damselfly species exhibited a Type II functional response with a maximum of 20-30 prey eaten per hour. Both E. hageni and I. verticalis larvae are efficient predators that selectively capture P. pediculus and small D. pulex; they avoid H. gibberum. Due to this differential predation, these larvae may substantially alter zooplankton community composition.