Vertebrate and invertebrate predation intensity on freshwater zooplankton communities
Vertebrate and invertebrate predation intensity on freshwater zooplankton communities
复制标题
淡水浮游动物群落的脊椎动物和无脊椎动物捕食强度
作者：
P. Lane
捕食活动广泛存在于湖泊的中上层，脊椎动物和无脊椎动物的捕食者数量丰富，食性多样。脊椎动物捕食者通常具有尺寸选择性，几乎可以消除较大的猎物项目1 -3。这些由鱼类捕食引起的巨大影响使一些工作者得出结论，脊椎动物在淡水浮游动物的总捕食强度中所占比例最大。然而，特定的无脊椎动物捕食者也被证明可以收割其猎物种群的相当大比例4 -6。我在这里报告的一项研究表明，无脊椎动物的捕食是更激烈的比脊椎动物的捕食在密歇根州的海鸥湖的水层区，与第一次在现场评估两种类型的捕食一个单一的浮游动物猎物组合。识别湖泊中主要捕食途径的重要性是许多当代讨论营养和能量流以及考虑群落结构和稳定性的基础。
PREDATION is widespread in the pelagic zone of lakes and both vertebrate and invertebrate predators are abundant and diverse in their feeding habits. Vertebrate predators are often size-selective and can virtually eliminate larger prey items1–3. These dramatic effects resulting from fish predation have led several workers to conclude that vertebrates contribute the largest percentage of the total predation intensity on freshwater zooplankton. Particular invertebrate predators, however, have also been shown to crop a substantial proportion of their prey populations4–6. I report here a study showing that invertebrate predation is more intense than vertebrate predation in the pelagic zone of Gull Lake, Michigan, with the first in situ evaluation of both types of predation on a single zooplankton prey assemblage. The significance of identifying major predation pathways in lakes is basic to many contemporary discussions of nutrient and energy flow as well as considerations of community structure and stability.