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Tiny grazers play key role in marine ecosystem health
Date:4/2/2013

but they also help clean our water and buffer our coastal communities by providing shoreline protection from storms," Grace said. "These tiny animals, by going about their daily business of grazing, are integral to keeping healthy seagrass beds healthy."

In fact, the authors wrote, if not for the algal munching of these grazers, algae could blanket the seagrasses, blocking out sunlight and preventing them from photosynthesizing, which would ultimately kill the seagrasses. Seagrass declines in some areas are attributed partly to excessive nutrients in water bodies stimulating excessive algal growth on seagrasses.

"Coastal managers have been concerned for years about excess fertilizer and sediment loads that hurt seagrasses," said J. Emmett Duffy of Virginia Institute of Marine Science and coauthor of the study. "Our results provide convincing field evidence that grazing by small animals can be just as important as good water quality in preventing nuisance algae blooms and keeping seagrass beds healthy."

The USGS scientists involved in this study serve as members of a worldwide consortium of researchers examining the health of seagrasses. This research by Virginia Institute of Marine Science and USGS researchers is the first in a series of studies worldwide on seagrass ecosystems.


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Contact: Gabrielle Bodin
boding@usgs.gov
337-266-8655
United States Geological Survey
Source:Eurekalert

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