Biotic interactions can structure ecological communities and influence ecosystem functioning. As ecosystem engineers and filter feeders, bivalves often have disproportionately large effects on ecosystem functioning. They also utilize numerous morphological and behavioral responses to reduce predation, which can include changes in their filtration rates. To test the response of Crassostrea virginica filtration rates to the presence of predators, juvenile and adult oysters were separately exposed to varying types of predation risk from Callinectes sapidus and Panopeus herbstii in outdoor mesocosms. Water column chlorophyll a concentrations and crab behavior were measured over the duration of the experiment. Predation risk had no effect on oyster reef drawdown of chlorophyll a, which suggests that this important ecosystem function of oyster reefs is not mediated by behaviorally induced predator effects. Therefore, efforts to model how oyster predators influence filtration rates and associated ecosystem services should focus primarily on the factors that influence oyster mortality rather than predator effects on oyster behavior.
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We thank our reviewer and editors for their helpful comments that improved the manuscript. Funding for this experiment was provided by National Science Foundation grant nos. OCE-1203859 (JHG) and OCE-0961929 (MFP).
Communicated by Alf Norkko
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Dodd, L.F., Caracappa, J.C., Fegley, S.R. et al. Threat of Predation Does Not Affect Crassostrea virginica Filtration. Estuaries and Coasts 41, 293–298 (2018). https://doi.org/10.1007/s12237-017-0269-3
- Crassostrea virginica
- Non-consumptive effects