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Combining endogenous and exogenous spatial variability in analytical population models.

Benjamin M Bolker1

  • 1Zoology Department, University of Florida, Box 118525, 318 Carr Hall, Gainesville, FL 32611-8525, USA. bolker@zoo.ufl.edu

Theoretical Population Biology
|October 3, 2003
PubMed
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Spatial heterogeneity in mortality, both from habitat and crowding, impacts population viability. Exogenous heterogeneity generally improves population viability by creating refuges, contrary to some fragmentation studies.

Area of Science:

  • Ecology
  • Population Dynamics
  • Spatial Modeling

Background:

  • Ecological models often simplify spatial heterogeneity, overlooking combined effects of endogenous and exogenous factors.
  • Understanding how spatial variations in mortality influence population persistence is crucial for conservation.

Purpose of the Study:

  • To analyze the combined effects of endogenous and exogenous spatial heterogeneity on population viability.
  • To investigate how landscape heterogeneity and local density influence mortality rates and population persistence.

Main Methods:

  • Utilized spatial moment equations and simulation models for analysis.
  • Developed a single-population model incorporating density-dependent and habitat-dependent mortality.
  • Partitioned heterogeneity effects into local crowding and habitat association.

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Main Results:

  • Exogenous heterogeneity in mortality increased population viability via habitat association.
  • Exogenous heterogeneity decreased viability through increased crowding.
  • The net effect of exogenous heterogeneity was generally to improve population viability.

Conclusions:

  • Spatial heterogeneity, particularly exogenous factors creating refuges, can enhance population viability.
  • Findings contrast with some literature focusing solely on negative fragmentation effects.
  • Highlights the importance of considering both habitat benefits and crowding costs in spatial models.