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Mongabay.com is considered a leading source of information on tropical forests by some of the world's top ecologists and conservationists. TROPICAL RAINFORESTS: Disappearing Opportunities

Presence Does Not Always Signify Survivability in Degraded Forest



The presence of certain species in an area of degraded forest can be misleading in trying to interpet their resiliency to forest disturbance. In some cases disturbed forest may provide enough resources for a species to exist but not maintain a positive population growth rate. Their presence in the forest patch (known as a population sink) is only maintained by continued migration from an adjacent source population in an area of undisturbed or higher quality forest (known an a population source). Though the behavior and population densities of the two areas may be similar, the population of the degraded habitat can not be sustained without the source population.

If the high quality habitat is disturbed and there are no other adjacent habitats of suitable quality, both populations will be lost and the species will become extinct in the area. This is an important consideration for wildlife conservation through sustainable development schemes. For some species to persist, there must be corridors connecting intact habitats with secondary forests.


Continued: Extinction


Other pages in this section:

Consequences of Deforestation
Erosion
Loss of Renewable Resources
Atmospheric Role
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References
References
References
References
References
Local Climate Regulation
Loss of Species, Disease
Climactic Role
Extinction
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Kids version of this section
- Why are rainforests important?
- Climate
- Home to wildlife
- Water cycle
- Erosion control
- Extinction


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Copyright Rhett Butler 1994-2015

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