Increasing isolation reduces predator:prey species richness ratios in aquatic food webs
Increasing isolation reduces predator:prey species richness ratios in aquatic food webs
复制标题
增加隔离会降低水生食物网中捕食者：猎物物种的丰富度比率
DOI：
10.1111/j.0030-1299.2007.14690.x
复制
发表时间：
2007
期刊：
影响因子：
3.4
通讯作者：
Jonathan M. Chase
中科院分区：
文献类型：
--
作者：
RACHEL S. Shulman;Jonathan M. Chase
生活在一个栖息地的物种数量通常会随着栖息地变得更加孤立而下降。然而，栖息地隔离对食物网结构模式的影响，特别是捕食者与猎物物种丰富度的比例，还不太清楚。我们把水生围隔在不同的距离作为潜在的殖民者的来源池塘，然后我们研究了隔离如何影响捕食者的比例：猎物物种丰富度的社区组装。在最后的采样中，共有21种（12个猎物和9个捕食者）的昆虫，甲壳类动物和两栖动物的中生态系统殖民。我们发现，总的物种丰富度，以及丰富的捕食者和猎物，减少与隔离。然而，捕食者丰富度下降的速度比猎物丰富度增加隔离，这导致捕食者：猎物比下降。这一结果与以前的示威不变的捕食者：猎物在淡水社区的比例冲突。
The number of species that live in a habitat typically declines as that habitat becomes more isolated. However, the influence of habitat isolation on patterns of food web structure, in particular the ratio of predator to prey species richness, is less well understood. We placed aquatic mesocosms at varying distances from ponds that acted as sources of potential colonists; then we examined how isolation affected the ratio of predator:prey species richness in the communities that assembled. In the final sampling, a total of 21 species (12 prey and 9 predators) of insects, crustaceans, and amphibians had colonized the mesocosms. We found that total species richness, as well as the richness of predators and prey, declined with increasing isolation. However, predator richness declined more rapidly than prey richness with increasing isolation, which lead to decreasing predator:prey ratios. This result conflicts with prior demonstrations of invariant predator:prey ratios in freshwater communities.