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The effects of experimental bait collection and trampling on a Mytilus californianus mussel bed in southern California

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Abstract

Rocky shores in southern California are heavily visited by humans. At sites used by recreational fishers, the effects of foot traffic combined with the collection of mussels for bait may reduce mussel cover and create mussel-free gaps. To test this hypothesis, the effects of trampling and bait-removal on mussel populations were experimentally examined. Plots in a mussel bed were subjected to monthly combinations of trampling (0, 150, or 300 steps) and simulated bait-removal (0 or 2 removed mussels). Although the experiment was done during a period of high natural disturbance associated with the 1997–1998 ENSO, plots receiving treatments experienced significantly greater reductions in mussel cover, mass, and density than controls. These results indicate that visitor foot traffic and bait-removal by fishers can significantly reduce mussel cover, density, biomass, and sizes.

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Acknowledgements

We are grateful for the field assistance of several individuals, most notably Paul Denis, Teri Denis, Janine Kido, and Jill Moeller. We would also like to thank C. Eugene Jones and Roger Seapy for their constructive suggestions and edits, and Kelly Donovan for preparation of figures. We are grateful to the Monarch Bay Community and Beach Club (Monarch Bay) for facilitating access to the study site. This study was funded by the National Sea Grant College Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce under Grant NA 46 RG 0472. We are also grateful for funding provided by the Pacific Outer Continental Shelf Region, Minerals Management Service, U.S. Department of the Interior and the Coastal Marine Institute, University of California, Santa Barbara. Additional financial support was provided by the California State University, Fullerton (CSUF) Department of Biological Science and the CSUF Departmental Associated Council. J.R.S. is grateful to the University of Southern California Sea Grant Program for supporting his work as a Sea Grant trainee. The views expressed herein do not necessarily reflect the views of NOAA or MMS or any of its subagencies.

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Correspondence to Jayson R. Smith.

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Communicated by P.W. Sammarco, Chauvin

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Smith, J.R., Murray, S.N. The effects of experimental bait collection and trampling on a Mytilus californianus mussel bed in southern California. Marine Biology 147, 699–706 (2005). https://doi.org/10.1007/s00227-005-1619-4

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