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1 May 2017 The Effect of Climate Variability on the Abundance of the Sandy Beach Clam (Mesodesma mactroides) in the Southwestern Atlantic
Gastón Manta, Marcelo Barreiro, Leonardo Ortega, Omar Defeo
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Abstract

Manta, G.; Barreiro, M.; Ortega, L., and Defeo, O., 2017. The effect of climate variability on the abundance of the sandy beach clam (Mesodesma mactroides) in the southwestern Atlantic.

The yellow clam Mesodesma mactroides is a fast-growing, short-lived species that inhabits sandy beaches of the southwestern Atlantic Ocean (SAO). The purpose of this study was to relate interannual fluctuations of the yellow clam population in Uruguay to climate circulation anomalies in the SAO. Twenty-three years of clam abundance, as well as sea-surface temperature anomalies (SSTA), salinity, and wind stress anomalies (WSA) from oceanic reanalyses were used. Composites and linear regressions showed that the best scenario for high abundance of M. mactroides is characterized by cold and salty waters and onshore WSA on the Uruguayan Atlantic coast. These local WSA are part of a cyclonic configuration of WSA in the SAO that forces negative SSTA in the region. High and low M. mactroides abundance tended to occur along with La Niña and El Niño events in the equatorial Pacific Ocean, respectively. These results suggest that interannual fluctuations in M. mactroides abundance are not only locally but also remotely controlled by regional- and global-scale climate variability modes.

©Coastal Education and Research Foundation, Inc. 2017
Gastón Manta, Marcelo Barreiro, Leonardo Ortega, and Omar Defeo "The Effect of Climate Variability on the Abundance of the Sandy Beach Clam (Mesodesma mactroides) in the Southwestern Atlantic," Journal of Coastal Research 33(3), 531-536, (1 May 2017). https://doi.org/10.2112/JCOASTRES-D-16-00054.1
Received: 1 April 2016; Accepted: 4 June 2016; Published: 1 May 2017
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