Shifting individual habitat specialization of a successful predator living in anthropogenic landscapes

Marine ecology progress series

*, David Grémillet¹  , Willem Bouten²  , Francisco J. Ramirez²  , Isabel Afán²  Joan Navarro³ 

[1] Centre d’Ecologie Fonctionnelle et Evolutive, UMR 5175, CNRS - Université de Montpellier - Université Paul-Valéry Montpellier - EPHE, 34293 Montpellier, France;Estación Biológica de Doñana CSIC, Avda. Américo Vespucio s/n, Sevilla 41092, Spain;Estación Biológica de Doñana CSIC, Avda. Américo Vespucio s/n, Sevilla 41092, Spain. Centre d’Ecologie Fonctionnelle et Evolutive, UMR 5175, CNRS - Université de Montpellier - Université Paul-Valéry Montpellier - EPHE, 34293 Montpellier, France

关键词: Foraging strategies;    Gulls;    GPS;    Habitat use;    Individual specialization;    Movement ecology;    Opportunistic seabirds;    Seabird;    Spatial ecology;    Winning species;   

DOI  :  10.3354/meps12124

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

Population expansions of successful species have gained importance as a major conservation and management concern. The success of these ‘winners’ is widely attributed to their high adaptability and behavioural plasticity, which allow them to efficiently use opportunities provided by human-modified habitats. However, most of these studies consider conspecifics as ecological equivalents, without considering the individual components within populations. This is critical for a better understanding of the main ecological mechanisms related to the success of winning species. Here, we investigated the spatial ecology of the opportunistic yellow-legged gull Larus michahellis, a clear example of a winning species in southern Europe, to examine its degree of individual specialization in habitat use. To test for such individual strategies, we applied specialization metrics to spatial data obtained from 18 yellow-legged gulls that were GPS-tracked simultaneously during the breeding season. The results revealed that population-level generalism in habitat use in the yellow-legged gull arises through varying levels of individual specialization, and individual spatial segregation within each habitat. Importantly, we found that the combination of individual specialization and individual spatial segregation may reduce intra-specific competition, with these 2 important mechanisms driving the success of this winning species.

【 授权许可】

Unknown