期刊
EUROPEAN JOURNAL OF ENTOMOLOGY
卷 105, 期 3, 页码 405-409出版社
CZECH ACAD SCI, INST ENTOMOLOGY
DOI: 10.14411/eje.2008.051
关键词
balanced dispersal; Coccinella septempunctata; habitat choice; ideal free distribution; matching principle
类别
资金
- GA AV [IAA 10007060 1]
- Institute of Entomology [Z50070508]
This article Studies coccinellid dispersal in heterogeneous environments using some hypotheses oil dispersal rates that correspond to empirical observations. It is assumed that emigration rates increase with decreasing patch payoff that is measured either as the number of aphids per a lady beetle, or as the number of aphids only. Three scenarios for immigration are considered: individuals choose patches unconditionally, immigration is proportional to patch quality, and immigration is proportional to patch payoff. Coccinellid spatial distributions corresponding to these assumptions are given by a power law. Using some data from the literature oil distribution of Coccinella septempunctata it is shown that the model with emigration proportional to the ratio of the number of conspecifics to aphid density and unconditional immigration rates provides the best fit when compared with the other models. This model predicts undermatching where better patches get lower consumer density when compared with the ideal free distribution.
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