文章基本信息

标题：The effect of turbidity and prey fish density on consumption rates of piscivorous Eurasian perch Perca fluviatilis
本地全文：下载
作者：Lene Jacobsen ; Søren Berg ; Henrik Baktoft 等
期刊名称：Journal of limnology
印刷版ISSN：1129-5767
电子版ISSN：1723-8633
出版年度：2014
卷号：73
期号：1
DOI：10.4081/jlimnol.2014.837
出版社：Istituto italiano di idrobiologia
摘要：Predator-prey interaction strengths in variable environments constitute a fundamental link to the understanding of aquatic ecosystem responses to environmental change.The present study investigates the effects of visibility conditions and prey fish density on predation rates of visually oriented piscivorous Eurasian perch Perca fluviatili s L.This was done in outdoor mesocosm (16 m2) experiments with clear water and two levels of turbidity (25 and 105 NTU) and two prey fish densities [3.1 and 12.5 roach Rutilus rutilus (L.) individuals m–2].Perch consumption rates were affected by visibility less than expected, while they were highly affected by increased prey fish density.Perch responded to high prey density in all visibility conditions, indicating that prey density is more crucial for consumption than visibility in turbid lakes.
关键词：visibility; roach prey; mesocosm; piscivory; hunting mode.