Frelik Anna, Pakulnicka Joanna
Department of Ecology and Environment Protection, Faculty of Biology and Biotechnology, University of Warmia and Mazury, Olsztyn 10-727, Poland.
Environ Entomol. 2015 Oct;44(5):1348-57. doi: 10.1093/ee/nvv113. Epub 2015 Jul 21.
This paper investigates the relations between the diet structure of predaceous adult water beetles from the Dytiscidae family and the structure of macrofauna inhabiting the same environments. The field studies were carried out from April until September in 2012 and 2013 in 1-mo intervals. In total, >1,000 water beetles and 5,115 benthic macro-invertebrates were collected during the whole period of the study. Subsequently, 784 specimens of adult water beetles (70.6% out of the total sampled) with benthic macro-invertebrates found in their proventriculi, were subject to analysis. The predators were divided into three categories depending on their body size: small beetles (2.3-5.0 mm), medium-sized beetles (13-15 mm), and large beetles (27-37 mm). All adult Dytiscidae consumed primarily Ephemeroptera and Chironomidae larvae. Although Asellidae were numerically dominant inhabitants of the sites, the adult water beetles did not feed on them. The analysis of feeding relations between predators and their prey revealed that abundance of Ephemeroptera, Chironomidae, and larval Dytiscidae between the environment and the diet of adult Dytiscidae were strongly correlated.
本文研究了龙虱科成年捕食性水甲虫的饮食结构与栖息于相同环境中的大型动物区系结构之间的关系。2012年和2013年4月至9月期间，每隔1个月进行一次实地研究。在整个研究期间，共收集了1000多只水甲虫和5115只底栖大型无脊椎动物。随后，对784只成年水甲虫标本（占总采样数的70.6%）进行了分析，这些标本的前胃中发现有底栖大型无脊椎动物。根据体型大小，将捕食者分为三类：小型甲虫（2.3 - 5.0毫米）、中型甲虫（13 - 15毫米）和大型甲虫（27 - 37毫米）。所有成年龙虱科主要捕食蜉蝣目和摇蚊科幼虫。虽然阿塞尔科在这些地点的数量上占主导地位，但成年水甲虫并不以它们为食。对捕食者与其猎物之间的捕食关系分析表明，蜉蝣目、摇蚊科和龙虱科幼虫在环境与成年龙虱科饮食之间的丰度具有很强的相关性。
