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Comparing edge and fragmentation effects within seagrass communities: A meta-analysis
Amy H Yarnall1, James E Byers2, Lauren A Yeager3
1Institute of Marine Sciences, University of North Carolina at Chapel Hill, Morehead City, North Carolina, USA.
Ecology
|December 13, 2021
Summary
Habitat fragmentation and edge effects impact seagrass ecosystems. While both reduce seagrass density, fauna responses vary, and fragmentation effects are more variable than edge effects.
Area of Science:
- Marine Ecology
- Conservation Biology
- Ecosystem Dynamics
Background:
- Habitat configuration across scales influences ecosystem function.
- Patch-scale edge effects are hypothesized to drive landscape-scale fragmentation impacts.
- Fragmented habitats typically exhibit a higher edge-to-interior ratio compared to continuous habitats.
Purpose of the Study:
- To critically assess if patch-scale edge effects consistently scale up to patterns observed in fragmented landscapes.
- To synthesize evidence on edge and fragmentation effects in seagrass ecosystems.
- To analyze impacts on shoot density, faunal densities, and predation rates.
Main Methods:
- Conducted a meta-analysis on community relationships in seagrass ecosystems.
- Quantified edge effects using log response ratios (edge vs. interior).
- Quantified fragmentation effects using log response ratios (fragmented vs. continuous landscapes).
Main Results:
- Both edge and fragmentation effects reduced seagrass shoot densities; edge effects were stronger.
- Fauna densities were often higher in patch edges; fragmentation responses varied by taxa.
- Prey survival trended lower in both patch edges and fragmented landscapes.
- Variability in fragmentation effects was double that of edge effects for most metrics.
Conclusions:
- Edge effects show similarities to community dynamics in fragmented seagrass.
- Caution is advised against unilaterally scaling up edge effects to explain fragmentation.
- Fragmentation encompasses additional factors beyond edge effects that influence community dynamics.
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