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Habitat fragmentation promotes spatial scale separation under resource competition.
James Austin Orgeron1, Malbor Asllani1
1Department of Mathematics, Florida State University, 1017 Academic Way, Tallahassee, FL 32306, United States of America.
Journal of Theoretical Biology
|January 1, 2026
Summary
Habitat fragmentation drives species segregation. Stronger competitors occupy central patches, while weaker ones move to the periphery, potentially leading to speciation and increased biodiversity.
Area of Science:
- Ecology
- Theoretical Ecology
- Population Dynamics
Background:
- Human activities cause habitat fragmentation, altering ecological connectivity and species interactions.
- Fragmented habitats can be modeled as networks, with species dispersing across interconnected patches.
Purpose of the Study:
- To investigate how intraspecific competition and dispersal dynamics shape species distribution in fragmented landscapes.
- To analyze the interplay between competition, dispersal, and spatial heterogeneity in driving species segregation.
Main Methods:
- Modeling intraspecific competition with nonlinear random walk dispersal on habitat networks.
- Employing analytical insights and numerical simulations to study population distribution patterns.
- Examining the effects of network size and structure on species segregation.
Main Results:
- Asymmetric competition and dispersal lead to nonuniform species distribution.
- Individuals with stronger competitive traits accumulate in central (hub) patches.
- Weaker competitors are displaced to peripheral patches, resulting in spatial segregation.
Conclusions:
- Competition and spatial structure jointly influence species segregation in fragmented habitats.
- Extreme segregation occurs in large networks, with dominant individuals absent from peripheral patches and subordinate ones from central regions.
- This spatial segregation may promote speciation and biodiversity by reinforcing divergence and enabling coexistence.
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