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Evaluating predation pressure on green treefrog larvae across a habitat gradient
Margaret S Gunzburger1, Joseph Travis
1Department of Biological Science, Florida State University, Tallahassee, FL 32306-1100, USA. gunz@bio.fsu.edu
Oecologia
|June 5, 2004
Summary
Predation on green treefrog (Hyla cinerea) tadpoles is higher in temporary ponds due to predator communities. Tadpoles gain refuge from predators as they grow larger.
Area of Science:
- Ecology
- Amphibian Biology
- Predator-Prey Dynamics
Background:
- Predator effects on prey abundance are influenced by predator numbers and hunting success.
- Understanding predator communities and their impact on prey is crucial for ecological studies.
Purpose of the Study:
- To assess predator communities of green treefrog (Hyla cinerea) tadpoles across different habitats.
- To evaluate the effectiveness of individual predators on H. cinerea tadpoles.
- To determine how predation pressure varies between permanent and temporary aquatic habitats.
Main Methods:
- Community structure analysis using correspondence and cluster analyses across 23 aquatic habitats.
- Experimental assessment of predator effectiveness on H. cinerea tadpoles of varying sizes.
- Integration of predator abundance and effectiveness data to quantify predation pressure.
Main Results:
- Predator communities differed significantly between permanent and temporary aquatic habitats.
- Smaller H. cinerea tadpoles experienced lower survival rates with effective predators, indicating size-dependent refuge.
- Predation pressure on H. cinerea tadpoles was found to be higher in temporary ponds.
Conclusions:
- Hyla cinerea tadpoles achieve a size-related refuge from predation.
- Higher predation pressure in temporary ponds may explain the species' preference for permanent breeding habitats.
- Predation gradients from temporary to permanent habitats are species-specific and require empirical demonstration.
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