We examined reproduction of the pinnid bivalve Atrina seminuda (Lamarck, 1819) in tropical waters off northeastern Venezuela and compare it with reproduction of the same species in temperate waters of Argentina, as reported elsewhere (Soria et al., 2002). In Venezuela, a proportion
of individuals was reproducing throughout the year, although there was increased spawning activity in certain periods (May–July 2004, September–November 2004, and February 2005). Stepwise multi-regression analyses correlating the frequency of the different gametogenic stages with
various environmental factors suggested that reproduction was likely controlled primarily by temperature and secondarily by food abundance (as measured by chlorophyll a). During the first part of the year gamete production appeared to be supported by food resources obtained from the
environment (indicating an opportunistic reproductive strategy), whereas gamete production during a period of relatively low phytoplanktonic food availability (June–September) suggested that it was supported by tissue reserves (a conservative reproductive strategy). The above reproductive
pattern contrasts with A. seminuda in Argentina where gametogenesis is highly synchronized among individuals and follows an annual cycle. Also, A. seminuda in Argentina displays only the conservative reproductive strategy, with gamete production occurring during the period of
food scarcity in the autumn and probably supported by reserves from the adductor muscle (Soria et al., 2002). Together, these data provide the first comparison of reproduction of the same species in both tropical and temperate waters (separated by 50° in latitude).
The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.