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Influence of habitat quality, patch size and connectivity on colonization and extinction dynamics of collared pikas Ochotona collaris
Author(s) -
FRANKEN RENEE J.,
HIK DAVID S.
Publication year - 2004
Publication title -
journal of animal ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.134
H-Index - 157
eISSN - 1365-2656
pISSN - 0021-8790
DOI - 10.1111/j.0021-8790.2004.00865.x
Subject(s) - pika , metapopulation , extinction (optical mineralogy) , habitat , ecology , local extinction , population , colonization , geography , biology , biological dispersal , demography , national park , paleontology , sociology
Summary1 The effects of habitat quality, patch size and connectivity between patches on patterns of local extinction and colonization of collared pikas were studied over 7 years in alpine meadows in the south‐west Yukon. 2 Although adult population size independently had a significant influence on patch extinction, its influence was minimal when other variables were included in generalized linear models. Instead, an index of habitat quality and the connectivity of a patch were found to be the best predictors of pika extinction. 3 Similarly, patch connectivity only partly explained the recolonization of talus patches by pikas. Other patch characteristics, including aspect, amount of vegetation within the patch and an index of habitat quality based on survival probability of pikas also had a significant influence on recolonization. 4 These results suggest that the influence of patch quality on local extinction and recolonization need to be more fully incorporated into metapopulation models.