Diel and density-related changes in food consumption and prey selection by brook charr in a New Hampshire stream
Diel and density-related changes in food consumption and prey selection by brook charr in a New Hampshire stream
复制标题
新罕布什尔州一条溪流中溪鲑的食物消耗和猎物选择与昼夜和密度相关的变化
DOI：
10.1007/bf00005131
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发表时间：
1994
影响因子：
1.4
通讯作者：
W. McCarthy
中科院分区：
文献类型：
--
作者：
G. Forrester;Jeffrey G. Chace;W. McCarthy
概要我们报告了一项实地研究的结果，测试了密度和昼夜周期变化对溪红点鲑食物消耗和猎物选择的影响。将新罕布什尔州河流中重复的35 m长的部分中的木炭密度调整为中等或高水平（相对于自然密度）。然后每四小时对charr的饮食和漂流猎物的可用性进行采样，持续24小时。有没有显着的昼夜变化，每四小时消耗的猎物的重量，虽然有一些迹象表明，减少在夜间进食。沙里有选择性地喂养不同的猎物类群，表现出最偏爱的情况下石蛾幼虫。有几种蜉蝣和石蝇在白天比在晚上被更强烈地选择。Charr在白天选择性地进食较大的猎物，但在晚上没有大小选择。木炭的密度没有显着的影响，无论是他们的食物消耗率或选择不同类群或大小的猎物。
SynopsisWe report the results of a field study testing influences of both density and changes over the diel cycle on food consumption and prey selection by brook charr,Salvelinus fontinalis. Charr density in replicate 35 m long sections of a New Hampshire stream was adjusted to either medium or high levels (relative to natural densities). Diets of charr and the availability of drifting prey were then sampled every four hours for 24 hours. There were no significant diel changes in the weight of prey consumed by charr per four hours, though there was some indication of reduced feeding at night. Chary fed selectively on different prey taxa, showing most preference for cased caddis larvae. Several species of mayflies and stoneflies were selected more strongly during the day than at night. Charr fed selectively on larger prey during the daytime but showed no size-selection at night. The density of charr had no significant effects on either their rate of food consumption or on selection for prey of different taxa or sizes.