RESEARCH ARTICLE Spatial and Temporal Examination of Bivalve Communities in Several Estuaries of Southern California and Northern Baja California, MX Anai Novoa1☯*, Theresa S. Talley2☯, Drew M. Talley1☯, Jeffrey A. Crooks3‡, Nathalie B. Reyns1‡ 1 Department of Environmental and Ocean Sciences, University of San Diego, San Diego, California, United States of America, 2 Department of California Sea Grant Extension Program, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, United States of America, 3 Department of Tijuana River National Estuarine Research Reserve, Imperial Beach, California, United States of America ☯ These authors contributed equally to this work. ‡ These authors also contributed equally to this work. *
[email protected] OPEN ACCESS Abstract Citation: Novoa A, Talley TS, Talley DM, Crooks JA, Reyns NB (2016) Spatial and Temporal Examination A combination of historical bivalve surveys spanning 30–50 years and contemporary sam- of Bivalve Communities in Several Estuaries of Southern California and Northern Baja California, MX. pling were used to document the changes in bivalve community structure over time at four PLoS ONE 11(2): e0148220. doi:10.1371/journal. southern California and one northern Baja California estuaries. While there are limitations to pone.0148220 the interpretation of historic data, we observed generally similar trends of reduced total Editor: Erik V. Thuesen, The Evergreen State bivalve species richness, losses of relatively large and/or deeper-dwelling natives, and College, UNITED STATES gains of relatively small, surface dwelling introduced species across the southern California Received: June 24, 2015 estuaries, despite fairly distinct bivalve communities. A nearly 50-year absence of bivalves Accepted: January 14, 2016 from two wetlands surveyed in a Baja California estuary continued.