| 来源类型 | Monograph (IIASA Interim Report) |
| 规范类型 | 报告 |
| A generalized functional response for predators that switch between multiple prey species. | |
| van Leeuwen E; Brannstrom Å; Jansen VAA; Dieckmann U; Rossberg AG | |
| 发表日期 | 2013 |
| 出版者 | IIASA, Laxenburg, Austria: IR-13-072 |
| 出版年 | 2013 |
| 语种 | 英语 |
| 摘要 | We develop a theory for the food intake of a predator that can switch between multiple prey species. The theory addresses empirical observations of prey switching and is based on the behavioral assumption that a predator tends to continue feeding on prey that are similar to the prey it has consumed last, in terms of, e.g., their morphology, defenses, location, habitat choice, or behavior. From a predator's dietary history and the assumed similarity relationship among prey species, we derive a general closed-form multi-species functional response for describing predators switching between multiple prey species. Our theory includes the Holling type II functional response as a special case and makes consistent predictions when populations of equivalent prey are aggregated or split. An analysis of the derived functional response enables us to highlight the following five main findings. (1) Prey switching leads to an approximate power-law relationship between ratios of prey abundance and prey intake, consistent with experimental data. (2) In agreement with empirical observations, the theory predicts an upper limit of 2 for the exponent of such power laws. (3) Our theory predicts deviations from power-law switching at very low and very high prey-abundance ratios. (4) The theory can predict the diet composition of a predator feeding on multiple prey species from diet observations for pedators feeding only on pairs of prey species. (5) Predators foraging on more prey species wil show less pronounced prey switching than predators foraging on fewer prey species, thus providing a natural explanation for the known difficulties of observing prey switching in the field. |
| 主题 | Evolution and Ecology (EEP) |
| 关键词 | prey similarity functional response frequency-dependent selection apostatic selection predator behavior foraging alternative prey adaptive foraging search image |
| URL | http://pure.iiasa.ac.at/id/eprint/10695/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/125921 |
| 推荐引用方式 GB/T 7714 | van Leeuwen E,Brannstrom Å,Jansen VAA,et al. A generalized functional response for predators that switch between multiple prey species.. 2013. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| IR-13-072.pdf（581KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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