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Habitat Fragmentation

Habitat Fragmentation

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.

Distribution and Dispersion

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...

Ecological Disturbance

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...

What are Populations and Communities?

What are Populations and Communities?

Populations are groups of individuals of the same species that inhabit a shared environment. Communities include multiple co-existing, interacting populations of different species. Metapopulations span multiple populations of the same species that occupy different areas. Metapopulations interact through immigration and emigration, providing genetic diversity that lends resilience to harsh environments. Population size and density can be estimated using quadrat and mark and recapture...

Conservation of Declining Populations

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Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

Conservation of Small Populations

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...

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Related Experiment Video

Updated: Jun 5, 2026

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Published on: October 29, 2016

Patch-occupancy dynamics in fragmented landscapes.

¹Ilkka Hanski is at the Dept of Zoology, University of Helsinki, PO Box 17 (P. Rautatiekatu 13), FIN-00014 Helsinki, Finland.

Trends in Ecology & Evolution

|January 18, 2011

Summary

This study introduces incidence-function models to predict species occupancy in fragmented habitats. These models offer a powerful tool for managing metapopulations and conservation in fragmented landscapes.

Area of Science:

Ecology
Conservation Biology
Mathematical Biology

Background:

Species in fragmented landscapes face challenges in maintaining viable populations.
Understanding habitat patch occupancy is crucial for ecological dynamics.
Previous research generated significant information on occupancy patterns.

Purpose of the Study:

To construct a family of incidence-function models for metapopulations.
To parameterize these models using field data on patch occupancy.
To enable quantitative predictions for metapopulation management.

Main Methods:

Building upon an elementary Markov chain model of patch occupancy.
Developing a family of incidence-function models.
Parameterizing models with empirical field data.

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Main Results:

Demonstrated the construction of incidence-function models from basic Markov chain principles.
Showcased the ability to parameterize these models with real-world patch occupancy data.
Validated the models' utility for making quantitative predictions.

Conclusions:

Incidence-function models offer a powerful quantitative tool for metapopulation dynamics.
This approach can significantly aid in the management of reserve networks.
Effective management strategies for species in fragmented landscapes can be developed.