Global patterns in predator-prey size relationships reveal size dependency of trophic transfer efficiency
Global patterns in predator-prey size relationships reveal size dependency of trophic transfer efficiency
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DOI：
10.1890/08-2061.1
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发表时间：
2010-01-01
期刊：
影响因子：
4.8
通讯作者：
Jennings, Simon
中科院分区：
文献类型：
--
作者：
Barnes, Carolyn;Maxwell, David;Jennings, Simon
捕食者-猎物个体大小关系影响食物链长度、营养结构、转移效率、相互作用强度和污染物的生物积累。需要改进对这些关系及其对环境的响应的量化，以将食物网模型参数化，并描述食物网的结构和功能。编制了一个包含29 582个个体猎物记录的数据集，这些个体猎物在21个地点被个体捕食者吃掉，这些个体捕食者的质量跨越10个数量级，生活在从极地到热带的海洋环境中，用来研究捕食者大小和环境对捕食者和猎物大小关系的影响。线性混合效应模型表明，捕食者-猎物质量比(PPMR)随捕食者质量增加而增大。增加的数量因地点、捕食者种类和个体而异，但不受温度的显着影响。纬度、深度或初级产品。随着捕食者质量的增加，PPMR的增加意味着原木质量与营养水平之间的非线性关系，转移效率随着个体大小的增加而降低。结果表明，非常一般的规则决定了不同海洋生态系统中PPMR的主导趋势，导致基于大小的营养结构无处不在，以及个体相对丰度与其身体大小之间观察到的关系的一致性。
Predator-prey body size relationships influence food chain length, trophic structure, transfer efficiency, interaction strength, and the bioaccumulation of contaminants. Improved quantification of these relationships and their response to the environment is needed to parameterize food web models and describe food web structure and function. A compiled data set comprising 29 582 records of individual prey eaten at 21 locations by individual predators that spanned 10 orders of magnitude in mass and lived in marine environments ranging from the poles to the tropics was used to investigate the influence of predator size and environment on predator and prey size relationships. Linear mixed effects models demonstrated that predator prey mass ratios (PPMR) increased with predator mass. The amount of the increase varied among locations and predator species and individuals but was not significantly influenced by temperature. latitude, depth, or primary production. Increases in PPMR with predator mass implied nonlinear relationships between log body mass and trophic level and reductions in transfer efficiency with increasing body size. The results suggest that very general rules determine dominant trends in PPMR in diverse marine ecosystems, leading to the ubiquity of size-based trophic Structuring and the consistency of observed relationships between the relative abundance of individuals and their body size.