The interannual variability of size at maturity of the brown crab Callinectes bellicosus Stimpson, 1859 (Brachyura, Portunidae) in the Gulf of California
In: Crustaceana2Posgrado en Ciencias Biológico Agropecuarias, Universidad Autónoma de Nayarit, Carretera Tepic-Compostela km 9, Xalisco, Nayarit 63780, Mexico
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This study examines how the size at maturity (CW50%) of Callinectes bellicosus Stimpson, 1859 is affected by environmental variability and by the source of the data. The samples were obtained from a coastal lagoon in the eastern Gulf of California between 2000 and 2003, and in 2011. To explore for interannual variation in environmental conditions, an extended negative power-law model was used, with SSTa as the annual sum of monthly sea surface temperature anomalies and Chl-a as the monthly chlorophyll a mean in a year. The interannual variability in the CW50% of C. bellicosus was also calculated. We found that the percent of mature female drives inter-annual variability in CW50% and that the addition of Chl-a to the model does not contribute further to the explanation of this phenomenon. The hypothesis that environmental variations affect the reproductive dynamics of the stocks needs to be tested in this species in another area.
La presente investigación analiza la influencia de la variabilidad ambiental y la fuente de datos sobre la talla de madurez (AC50%) de Callinectes bellicosus Stimpson, 1859. Las muestras provienen de la laguna costera Santa María La Reforma en la costa oriental del golfo de California. Datos del ancho del cefalotórax (AC) fueron recolectados mensualmente de la pesquería y de las capturas comerciales del 2000 al 2003 y en 2011. Otra fuente de datos fueron los obtenidos dentro y en la boca de la laguna. La proporción de hembras maduras (PHM) del total de la muestra se estimó por año y fuente de datos y se utilizó como un índice de segregación de las hembras en etapa de madurez. Para explorar la variación inter-anual de las condiciones ambientales, un modelo potencial negativo extendido fue utilizado con las temperaturas mensuales superficiales del mar (TSMa) como suma anual de anomalías de TSMa, y Chl-a como clorofila mensual promedio en un año. Se describió la variabilidad interanual de los valores ambientales más importantes (TSMa y Chl-a) y de la AC50% de C. bellicosus; sin embargo, no se encontró una correlación entre ellos. La PHM induce la variabilidad interanual en AC50% y la adición de Chl-a no aporta explicación de este fenómeno. Las hipótesis de que las variaciones ambientales afectan la dinámica reproductiva de las poblaciones de esta especie necesita ser comprobada en otra área.
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The interannual variability of size at maturity of the brown crab Callinectes bellicosus Stimpson, 1859 (Brachyura, Portunidae) in the Gulf of California
In: Crustaceana2Posgrado en Ciencias Biológico Agropecuarias, Universidad Autónoma de Nayarit, Carretera Tepic-Compostela km 9, Xalisco, Nayarit 63780, Mexico
Search for other papers by Guillermo Rodríguez-Domínguez in
Current site
Google Scholar
PubMed
Search for other papers by Sergio G. Castillo-Vargasmachuca in
Current site
Google Scholar
PubMed
Search for other papers by Raúl Pérez-González in
Current site
Google Scholar
PubMed
Search for other papers by E. Alberto Aragón-Noriega in
Current site
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PubMed
This study examines how the size at maturity (CW50%) of Callinectes bellicosus Stimpson, 1859 is affected by environmental variability and by the source of the data. The samples were obtained from a coastal lagoon in the eastern Gulf of California between 2000 and 2003, and in 2011. To explore for interannual variation in environmental conditions, an extended negative power-law model was used, with SSTa as the annual sum of monthly sea surface temperature anomalies and Chl-a as the monthly chlorophyll a mean in a year. The interannual variability in the CW50% of C. bellicosus was also calculated. We found that the percent of mature female drives inter-annual variability in CW50% and that the addition of Chl-a to the model does not contribute further to the explanation of this phenomenon. The hypothesis that environmental variations affect the reproductive dynamics of the stocks needs to be tested in this species in another area.
| All Time | Past Year | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 216 | 39 | 9 |
| Full Text Views | 142 | 1 | 0 |
| PDF Views & Downloads | 17 | 2 | 0 |