Abundance patterns of early stages of the Pacific sardine (Sardinops sagax) during a cooling period in a coastal lagoon south of the California Current

摘要: Abundance patterns of eggs and larvae the Pacific sardine, Sardinops sagax (Jenyns, 1842), in Bahia Magdalena, Baja California Sur, were analysed during a cooling period south Current from 2005 to 2009. The thermohaline characteristics zooplankton abundance good descriptors potential spawning habitat. Individual quotient analyses showed predominance within SST range 16 18°C, at low salinities (33.9-34.1) density gradient variability (0.009-0.029), associated with deeper waters (25-40 m) near main entrance, where transparency was intermediate (6-8 relatively high ( > 316 ml/1000 m 3 ). Increments different class intervals meant that neither dissolved inorganic nitrogen (DIN), phosphates nor chlorophyll predominated. large interannual fluctuations sardine activity preferential temperatures observed historical recent data suggest two stocks spawn Magdalena: one stock spawned 1981-1989 1997-2009. influence warming periods as additional components regional environmental framework is discussed.