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6 - Habitat quality, niche breadth, temporal stochasticity, and the persistence of populations in heterogeneous landscapes

Published online by Cambridge University Press:  05 July 2011

By
Scott M. Pearson  and
Jennifer M. Fraterrigo
Edited by
Jianguo Liu ,
Vanessa Hull ,
Anita T. Morzillo  and
John A. Wiens
Scott M. Pearson
Affiliation:
Mars Hill College, NC
Jennifer M. Fraterrigo
Affiliation:
University of Illinois
Jianguo Liu
Affiliation:
Michigan State University
Vanessa Hull
Affiliation:
Michigan State University
Anita T. Morzillo
Affiliation:
Oregon State University
John A. Wiens
Affiliation:
PRBO Conservation Science
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Summary

Spatial heterogeneity in habitat quality creates variation in demographic performance among subpopulations and results in source–sink dynamics. We extend this idea to explore the effects of within-patch heterogeneity on population persistence in a simulation model. Spatial heterogeneity, niche breadth, and temporal stochasticity in the environment are widely recognized as important drivers of population structure, yet few studies have examined the combined influence of these factors. Simulated populations had life-history traits resembling perennial forest herbaceous plants, and simulated landscapes were based on forests of the southern Appalachian Mountains. Habitat quality varied continuously within and between habitat patches using realistic patterns based on topographic gradients. Temporal stochasticity in survival was implemented to simulate interannual climatic variation, and levels of stochasticity were varied to reflect different frequencies of extreme events. The effects of habitat fragmentation, spatial variation in habitat quality, and niche breadth resulted in differential demographic performance among habitat patches of similar size and shape. These effects overshadowed the influences of temporal stochasticity on population persistence. The results suggest that populations of forest perennials may be more sensitive to habitat fragmentation and variation in habitat quality than to temporal stochasticity due to climate. Specialist species will be more sensitive than generalists to such changes.

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Information
Sources, Sinks and Sustainability , pp. 115 - 138
Publisher: Cambridge University Press
Print publication year: 2011

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