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Camacho-Mondragón, M.A., M., Arellano Martínez, B.P., Ceballos Vázquez & B., Shirasago Germán (2011). Effect of a mild ENSO on the reproduction of the penshell Atrina maura (Sowerby,1835) (Bivalvia:Pinnidae) in Ensenada de La Paz, B.C.S., Mexico. 44th Western Society of Malacologists Annual Meeting and 12th National Biennial Meeting of Malacology and Conchology of The Sociedad Mexicana de Malacología, A.C.. La Paz, Baja California Sur, México, México, junio 27 - 30, 2011, 133.

Effect of a mild ENSO on the reproduction of the penshell Atrina maura (Sowerby,1835) (Bivalvia:Pinnidae) in Ensenada de La Paz, B.C.S., Mexico

Marian A. Camacho-Mondragón, Marcial Arellano Martínez, Bertha Patricia Ceballos Vázquez y Bernardo Shirasago Germán

The pen shell Atrina maura is an important fishery resource in Mexico. However, its stock has been depleted over the past decade because of over fishing and possibly by environmental variation. To investigate the influence of the ENSO on A. maura reproduction in Ensenada de La Paz, data collected during 2004-2005 and 2007-2008 were used. Only the comparable months corresponding to “El Niño”, “La Niña”, and “Normal” periods (according with the registry of the Oceanic “El Niño” Index) were considered. A total of 742 organ­isms was obtained (11-30 cm in height) and histologically processed. The general condition index was sig­nificantly higher in “El Niño” (36.5±1.6 SE) (P<0.001) compared with “La Niña” (29.3±1.3 SE), and “Normal” (29.9±1.1 SE) periods. In the same manner, during “El Niño” there were more ripe (55%) but lesser spawn­ing (40%) organisms, together with significantly (P<0.05) more females than males. Whereas, in “La Niña” there was a significantly (P<0.001) lower proportion of reabsorbing gonads (31.2±7.1 SE) compared with “El Niño” (79.7±5.3 SE) and “Normal” (62.1±10 SE), observed from September to November (greater tempera­ture anomalies). The size at first maturity was similar between periods (21 cm height shell). Therefore, in Ensenada de La Paz, lower temperatures (i.e. “La Niña” period) enhance the reproduction of A. maura, and on the contrary, higher temperatures (i.e. “El Niño” period) have negative effects, causing abnormal spawn­ing events and reabsorbing of gametes.

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