Spatial Heterogeneity in the Effects of Climate and Density-dependence on Dispersal in a House Sparrow Metapopulation

Overview

Journal Proc Biol Sci

Specialty Biology

Date 2011 May 27

PMID 21613299

Citations 13

Authors

Henrik Parn

Thor Harald Ringsby

Henrik Jensen

Bernt-Erik Saether

Affiliations

Soon will be listed here.

Abstract

Dispersal plays a key role in the response of populations to climate change and habitat fragmentation. Here, we use data from a long-term metapopulation study of a non-migratory bird, the house sparrow (Passer domesticus), to examine the influence of increasing spring temperature and density-dependence on natal dispersal rates and how these relationships depend on spatial variation in habitat quality. The effects of spring temperature and population size on dispersal rate depended on the habitat quality. Dispersal rate increased with temperature and population size on poor-quality islands without farms, where house sparrows were more exposed to temporal fluctuations in weather conditions and food availability. By contrast, dispersal rate was independent of spring temperature and population size on high-quality islands with farms, where house sparrows had access to food and shelter all the year around. This illustrates large spatial heterogeneity within the metapopulation in how population density and environmental fluctuations affect the dispersal process.

Citing Articles

The interplay between abiotic and biotic factors in dispersal decisions in metacommunities.

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Study methodology impacts density-dependent dispersal observations: a systematic review.

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Dispersal without drivers: Intrinsic and extrinsic variables have no impact on movement distances in a terrestrial amphibian.

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Cold winters have morph-specific effects on natal dispersal distance in a wild raptor.

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Consistent scaling of inbreeding depression in space and time in a house sparrow metapopulation.

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