Scaling up the functional response for spatially heterogeneous systems
Scaling up the functional response for spatially heterogeneous systems
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DOI：
10.1111/j.1461-0248.2008.01159.x
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发表时间：
2008-05-01
期刊：
影响因子：
8.8
通讯作者：
Leonardsson, Kjell
中科院分区：
文献类型：
--
作者：
Englund, Goran;Leonardsson, Kjell
尺度转换理论是一个从局部过程函数和空间异质性估计来预测区域人口动态的框架。使用这个框架，我们估计区域尺度的功能反应，在波罗的海的底栖捕食系统。功能反应是基于实验室实验或胃内容物的实地观察，以及在当地规模（0.1米（2））或区域规模（300公里（2））测量的猎物密度。实验室数据高估了消费在高猎物密度，而预测的基础上，当地规模的数据吻合密切观察到的消费在区域范围内。预测的区域功能反应是不同的增加和减少猎物密度，反映捕食者和猎物密度，以及它们之间的协方差，表现出振荡动力学。我们的结论是，重要的是要验证实验室数据与小规模的现场观测和规模的过渡是一个强大的工具，在异构系统中按比例放大的过程功能。
Scale transition theory is a framework for predicting regional population dynamics from local process functions and estimates of spatial heterogeneity. Using this framework, we estimated regional scale functional responses for a benthic predator-prey system in the Baltic Sea. Functional responses were based on laboratory experiments or field observations of stomach contents, and prey densities measured at a local scale (0.1 m(2)) or a regional scale (300 km(2)). Laboratory data overestimated consumption at high prey densities, whereas predictions based on local scale data tallied closely with consumption observed at the regional scale. The predicted regional functional response was different for increasing and decreasing prey densities, reflecting that predator and prey densities, as well as the covariance between them, exhibit oscillatory dynamics. We conclude that it is important to validate laboratory data with small-scale field observations and that scale transition is a powerful tool for scaling-up process functions in heterogeneous systems.