Effects of fish predation and habitat type on stream benthic communities
Effects of fish predation and habitat type on stream benthic communities
复制标题
鱼类捕食和生境类型对溪流底栖群落的影响
作者：
J. Dahl;L. Greenberg
在瑞典南部的一条小溪中，在9个野外围栏（8 ×3 m）中研究了栖息地对鱼类捕食者（褐鳟鱼萨尔莫trutta）和底栖无脊椎动物群落之间相互作用的影响。三个栖息地的治疗进行了测试，浅桑迪栖息地，深栖息地包含的大，小鹅卵石的混合物和一个中等深度的栖息地与大鹅卵石。为期一个月的实验表明，这些生境之间的底栖大型无脊椎动物区系的丰度和生物量没有重大差异，因为无脊椎动物没有功能群，只有少数类群在处理之间存在差异。无脊椎动物漂移率随时间的推移而下降，这可能与无脊椎动物生命周期的季节性变化或捕食的影响独立的栖息地类型，因为没有治疗之间的差异。
The influence of habitat on interactions between a fish predator (brown trout Salmo trutta) and a benthic invertebrate community was studied in nine field enclosures (8 ×3 m) in a creek in southern Sweden. Three habitat treatments were tested, a shallow sandy habitat, a deep habitat containing a mixture of large and small cobbles and a moderately deep habitat with large cobbles. The one month-long experiment showed that there were no major differences in the abundance and biomass of the benthic macroinvertebrate fauna among these habitats as no functional groups of invertebrates and only a few taxa differed between treatments. Invertebrate drift rates decreased over time, which was probably related to seasonal changes in invertebrate life cycles or to effects of predation independent of habitat type, as there was no difference between treatments.