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Habitat Fragmentation

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Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.

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Related Experiment Video

Updated: Sep 19, 2025

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Published on: October 29, 2016

Local negative frequency-dependence can decrease global coexistence in fragmented populations.

Anush Devadhasan^1,2, Oana Carja¹

¹Computational Biology Department, School of Computer Science, Carnegie Mellon University, Pittsburgh, PA, USA.

Biorxiv : the Preprint Server for Biology

|June 6, 2025

Summary

This summary is machine-generated.

Negative frequency-dependent (NFD) selection promotes biodiversity locally. However, in fragmented landscapes, NFD selection can paradoxically reduce coexistence and diversity, challenging its general role in maintaining biodiversity.

Keywords:

biodiversity coexistence complex spatial structure fragmented populations frequency dependent selection niche theory population structure

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Area of Science:

Ecology
Evolutionary Biology
Theoretical Biology

Background:

Negative frequency-dependent (NFD) selection is a key mechanism for maintaining biodiversity by favoring rare variants.
While NFD selection is confirmed at local scales, its role in maintaining biodiversity across larger, fragmented landscapes is unclear.

Purpose of the Study:

To investigate whether local NFD selection is sufficient to maintain biodiversity in fragmented populations.
To explore the impact of landscape fragmentation on the dynamics of NFD selection and species coexistence.

Main Methods:

Developed a theoretical model using the classic island framework to simulate NFD selection in fragmented populations.
Extended the model to a multispecies framework and incorporated spatial variation in carrying capacity.
Developed and applied a statistical test to empirical data of avian species in the Ryukyu Islands.

Main Results:

In fragmented populations, NFD selection paradoxically reduced coexistence and shortened fixation times compared to neutral processes.
Fragmentation led to a non-monotonic relationship between fixation time and population size, with lowest diversity at intermediate scales.
Empirical analysis of avian species data provided evidence that NFD selection suppresses coexistence in fragmented systems.

Conclusions:

Fragmentation can undermine the biodiversity-promoting effects of NFD selection.
The stabilizing role of NFD selection may be limited in heterogeneous and fragmented landscapes.
NFD selection's generality as a mechanism for maintaining biodiversity requires re-evaluation in light of landscape structure.