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Effects of culling on mesopredator population dynamics
James C Beasley1, Zachary H Olson, William S Beatty
1Savannah River Ecology Laboratory, University of Georgia, Aiken, South Carolina, United States of America. beasley@srel.edu
Plos One
|March 26, 2013
Summary
Population control of mesopredators like raccoons in fragmented habitats is complex. Culling disrupts demography, with slow recovery driven by male dispersal, potentially hindering disease management.
Area of Science:
- Ecology
- Wildlife Management
- Conservation Biology
Background:
- Human-induced land-use changes and loss of apex predators increase mesopredator populations.
- Mesopredators, like raccoons (Procyon lotor), are controlled due to their ecological roles and disease reservoir potential.
- Limited research exists on how landscape factors affect mesopredator responses to population control.
Purpose of the Study:
- To investigate the impact of habitat isolation on raccoon population recovery after removal.
- To determine the role of range expansion versus dispersal in mesopredator recolonization of fragmented landscapes.
- To assess how landscape composition and configuration influence demographic and behavioral responses to population manipulation.
Main Methods:
- Conducted a large-scale removal of 382 raccoons from 30 forest patches in an agricultural ecosystem.
- Monitored recolonization and demographic changes using mark-recapture from 2008-2010.
- Compared recovery rates in experimental patches with 25 unmanipulated control patches.
Main Results:
- After 3 years, only 40% of removed raccoon populations returned to pre-removal densities.
- Population recovery was limited by low female colonization and subsequent recruitment.
- Dispersing young males were the primary colonizers, indicating dispersal over range expansion.
- Neither landscape connectivity nor local habitat attributes affected colonization rates.
Conclusions:
- Raccoon population control through culling causes significant demographic disruption, potentially counterproductive for disease management in fragmented areas.
- Slow repopulation rates suggest localized depopulation can reduce ecological impacts at limited scales.
- Dispersal, not range expansion, drives recovery, with males dominating recolonization.
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