Decreasing seagrass density negatively influences associated fauna
Rosemary M McCloskey1, Richard K F Unsworth1
1Seagrass Ecosystem Research Group, College of Science, Swansea University , UK.
Peerj
|July 3, 2015
Summary
Small-scale disturbances reduce seagrass cover, significantly impacting motile fauna abundance and distribution. High seagrass density supports greater species diversity and richness, highlighting its crucial role as nursery habitat.
Area of Science:
- Marine Biology
- Ecology
- Habitat Restoration
Background:
- Seagrass meadows face global decline due to physical disturbances.
- Habitat loss impacts fragmentation, shoot density, canopy height, and coverage.
- Limited knowledge exists on how small-scale changes affect motile fauna distribution and abundance.
Purpose of the Study:
- Investigate fish and macrofaunal community responses to seagrass habitat variables.
- Determine species-specific habitat preferences in disturbed intertidal seagrass.
- Assess the effects of varying seagrass cover on fauna.
Main Methods:
- Multivariate analysis of faunal communities and habitat variables.
- Comparison of fauna in disturbed seagrass with sandy control plots.
- Quantification of species richness and Shannon Wiener Diversity (H') across different seagrass densities.
Main Results:
- Seagrass cover significantly influenced faunal abundance and distribution.
- Faunal composition varied with seagrass cover, with low cover resembling sandy areas.
- Higher seagrass cover correlated with significantly greater Shannon Wiener Diversity (H') and species richness.
Conclusions:
- Small-scale disturbances (e.g., anchor damage, vehicle use) negatively impact seagrass-associated fauna.
- Reduced seagrass density and cover diminish habitat value and biodiversity.
- Conservation of seagrass meadows is vital for maintaining ecosystem services, including nursery habitats.
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