Modelling Landscape-Level Numerical Responses of Predators to Prey: The Case of Cats and Rabbits

作者: Jennyffer Cruz , Alistair S. Glen , Roger P. Pech

DOI: 10.1371/JOURNAL.PONE.0073544

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摘要: Predator-prey systems can extend over large geographical areas but empirical modelling of predator-prey dynamics has been largely limited to localised scales. This is due partly difficulties in estimating predator and prey abundances areas. Collection data at suitably scales a major problem previous studies European rabbits (Oryctolagus cuniculus) their predators. applies Western Europe, where conserving predators such as Iberian lynx (Lynx pardinus) important, other parts the world are an invasive species supporting populations introduced, sometimes native, In pastoral regions New Zealand, primary feral cats (Felis catus) that threaten native fauna. We estimate seasonal numerical response fluctuations rabbit numbers grassland–shrubland habitat across Otago Mackenzie South Island Zealand. use spotlight counts 1645 km transects cat with novel approach accounts simultaneously for environmental stochasticity, density dependence varying detection probability. Our model suggests abundance related consistently spring summer, possibly through increased improving fecundity juvenile survival cats. Maintaining low should therefore suppress numbers, relieving predation pressure on prey. provided estimates area. was made possible by repeated sampling within each season, which allows estimation probabilities. A similar could be applied elsewhere, adapted any method direct observation there no double-counting individuals. Reliable responses essential managing both threatened

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