Benthic Communities and the Invasion of an Exotic Mussel in Mission Bay, San Diego: A Long-Term History
Dexter, Deborah M.
Crooks, Jeffrey A.
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A twenty-year dataset on the subtidal benthic macrofauna within Mis- <br /><br />sion Bay, San Diego, reveals distinct differences in community structure along a <br /><br />back-bay/front-bay gradient. Assemblages in the extreme back bay are character- <br /><br />ized by low diversities and abundances, and are dominated by an exotic mussel, <br /><br />Musculista senhousia. Species richness increases toward the mouth, and because <br /><br />of the very high densities of M. senhousia at a station intermediate in the spatial <br /><br />gradient, total abundance and biomass show sharp peaks in this region. Despite <br /><br />the dramatically increased dominance M. senhousia has achieved in the bay, few <br /><br />negative effects of this invasion on subtidal macrofauna are evident.