Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity
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Redalyc · Ciencias Marinas
Spatial and temporal variability in reproductive parameters was studied in combination with population demography to estimate sardine (Sardina pilchardus) population annual fecundity, as an indicator of its reproductive potential. Samples collected from commercial landings were used to determine the...
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Autónoma de Baja California
2011
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| _version_ | 1878325299810140160 |
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| author | C Nunes |
| author_facet | C Nunes |
| collection | Ciencias Marinas |
| container_title | Ciencias Marinas |
| contents | Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity C Nunes A Silva V Marques K Ganias Ciencias de la Tierra Iberian waters batch fecundity Atlantic sardine spawning fraction annual population fecundity Spatial and temporal variability in reproductive parameters was studied in combination with population demography to estimate sardine (Sardina pilchardus) population annual fecundity, as an indicator of its reproductive potential. Samples collected from commercial landings were used to determine the monthly proportion of active females and the duration of the spawning season, while data obtained during the 2002, 2005, and 2008 Daily Egg Production Method surveys were used to analyze the relationship between reproductive parameters (batch fecundity, spawning fraction) and individual biological characteristics (length, gutted weight, condition) for the west and south coasts of Portugal by generalized linear models. Population abundances and biological characteristics obtained per length class during acoustic surveys were subsequently used to integrate individual egg production to population demography. At the individual level, results indicated that the duration of the reproductive season was size-dependent, being shorter for smaller sardines. Batch fecundity was positively related to body size and differed significantly between the years and areas studied, with higher values on the west coast and an increasing trend towards the 2007/2008 spawning season. Mean values of spawning fraction varied significantly with space and time but the poor explanatory relationship obtained by the modelling of the spawning fraction against the individual biological characteristics did not allow the clarification of the factors affecting sardine spawning activity. At the population level, the differences obtained in egg production were found to be related to changes in population abundances as well as to the demographic structure, as larger females contributed proportionally more to the population annual fecundity. These results are in accordance with numerous recent studies indicating that the population reproductive potential may not always be proportional to the spawning biomass. 2011 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48021256005 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4B Vol.37 |
| ctrlnum | oai:cienciasmarinas.com.mx:article/1779 10.7773/cm.v37i4B.1779 |
| description | Spatial and temporal variability in reproductive parameters was studied in combination with population demography to estimate sardine (Sardina pilchardus) population annual fecundity, as an indicator of its reproductive potential. Samples collected from commercial landings were used to determine the monthly proportion of active females and the duration of the spawning season, while data obtained during the 2002, 2005, and 2008 Daily Egg Production Method surveys were used to analyze the relationship between reproductive parameters (batch fecundity, spawning fraction) and individual biological characteristics (length, gutted weight, condition) for the west and south coasts of Portugal by generalized linear models. Population abundances and biological characteristics obtained per length class during acoustic surveys were subsequently used to integrate individual egg production to population demography. At the individual level, results indicated that the duration of the reproductive season was size-dependent, being shorter for smaller sardines. Batch fecundity was positively related to body size and differed significantly between the years and areas studied, with higher values on the west coast and an increasing trend towards the 2007/2008 spawning season. Mean values of spawning fraction varied significantly with space and time but the poor explanatory relationship obtained by the modelling of the spawning fraction against the individual biological characteristics did not allow the clarification of the factors affecting sardine spawning activity. At the population level, the differences obtained in egg production were found to be related to changes in population abundances as well as to the demographic structure, as larger females contributed proportionally more to the population annual fecundity. These results are in accordance with numerous recent studies indicating that the population reproductive potential may not always be proportional to the spawning biomass.
Se estudió la variabilidad temporal y espacial de los parámetros reproductivos junto con la demografía poblacional para estimar la fecundidad anual de la población de sardina (Sardina pilchardus), como un indicador de su potencial reproductivo. Muestras de desembarques comerciales fueron utilizadas para determinar la proporción mensual de hembras activas y la duración del periodo de desove. Con los datos obtenidos durante las campañas del Método de la Producción Diaria de Huevos en 2002, 2005 y 2008, se analizó la relación entre los parámetros reproductivos (fecundidad parcial, fracción de desove) y las características biológicas individuales (talla, peso eviscerado, condición) para las costas oeste y sur de Portugal mediante modelos lineales generalizados. Las abundancias poblacionales y características biológicas obtenidas por clase de talla durante muestreos acústicos fueron utilizadas para extrapolar la producción individual de huevos a la demografía poblacional. A nivel individual, los resultados indicaron que la duración de la época reproductiva es dependiente de la talla, siendo más corta para sardinas más pequeñas. La fecundidad parcial está positivamente relacionada con la talla y difiere significativamente entre años y áreas, con valores superiores en la costa oeste y en la temporada de desove de 2007/2008. Los valores medios de la fracción de desove difirieron significativamente en tiempo y espacio, pero la escasa relación explicativa obtenida al modelar la fracción de desove contra las características biológicas individuales no permitió determinar los factores que afectan la actividad de desove de la sardina. A nivel poblacional, las diferencias obtenidas en la producción de huevos estuvieron relacionadas con los cambios en abundancias poblacionales y con la estructura demográfica, ya que las hembras de mayor tamaño contribuyeron proporcionalmente más a la fecundidad anual poblacional. Estos resultados concuerdan con estudios recientes que sugieren que el potencial reproductivo poblacional no es necesariamente proporcional a la biomasa desovante. |
| format | Artículo científico |
| id | redalyc_48021256005 |
| institution | Redalyc Ciencias Marinas |
| language | en |
| publishDate | 2011 |
| publisher | Universidad Autónoma de Baja California |
| spelling | Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity Integración de la talla, condición y demografía poblacional en la estimación de la fecundidad anual de la sardina iberoatlántica Nunes, C Silva, A Marques, V Ganias, K Spatial and temporal variability in reproductive parameters was studied in combination with population demography to estimate sardine (Sardina pilchardus) population annual fecundity, as an indicator of its reproductive potential. Samples collected from commercial landings were used to determine the monthly proportion of active females and the duration of the spawning season, while data obtained during the 2002, 2005, and 2008 Daily Egg Production Method surveys were used to analyze the relationship between reproductive parameters (batch fecundity, spawning fraction) and individual biological characteristics (length, gutted weight, condition) for the west and south coasts of Portugal by generalized linear models. Population abundances and biological characteristics obtained per length class during acoustic surveys were subsequently used to integrate individual egg production to population demography. At the individual level, results indicated that the duration of the reproductive season was size-dependent, being shorter for smaller sardines. Batch fecundity was positively related to body size and differed significantly between the years and areas studied, with higher values on the west coast and an increasing trend towards the 2007/2008 spawning season. Mean values of spawning fraction varied significantly with space and time but the poor explanatory relationship obtained by the modelling of the spawning fraction against the individual biological characteristics did not allow the clarification of the factors affecting sardine spawning activity. At the population level, the differences obtained in egg production were found to be related to changes in population abundances as well as to the demographic structure, as larger females contributed proportionally more to the population annual fecundity. These results are in accordance with numerous recent studies indicating that the population reproductive potential may not always be proportional to the spawning biomass. Se estudió la variabilidad temporal y espacial de los parámetros reproductivos junto con la demografía poblacional para estimar la fecundidad anual de la población de sardina (Sardina pilchardus), como un indicador de su potencial reproductivo. Muestras de desembarques comerciales fueron utilizadas para determinar la proporción mensual de hembras activas y la duración del periodo de desove. Con los datos obtenidos durante las campañas del Método de la Producción Diaria de Huevos en 2002, 2005 y 2008, se analizó la relación entre los parámetros reproductivos (fecundidad parcial, fracción de desove) y las características biológicas individuales (talla, peso eviscerado, condición) para las costas oeste y sur de Portugal mediante modelos lineales generalizados. Las abundancias poblacionales y características biológicas obtenidas por clase de talla durante muestreos acústicos fueron utilizadas para extrapolar la producción individual de huevos a la demografía poblacional. A nivel individual, los resultados indicaron que la duración de la época reproductiva es dependiente de la talla, siendo más corta para sardinas más pequeñas. La fecundidad parcial está positivamente relacionada con la talla y difiere significativamente entre años y áreas, con valores superiores en la costa oeste y en la temporada de desove de 2007/2008. Los valores medios de la fracción de desove difirieron significativamente en tiempo y espacio, pero la escasa relación explicativa obtenida al modelar la fracción de desove contra las características biológicas individuales no permitió determinar los factores que afectan la actividad de desove de la sardina. A nivel poblacional, las diferencias obtenidas en la producción de huevos estuvieron relacionadas con los cambios en abundancias poblacionales y con la estructura demográfica, ya que las hembras de mayor tamaño contribuyeron proporcionalmente más a la fecundidad anual poblacional. Estos resultados concuerdan con estudios recientes que sugieren que el potencial reproductivo poblacional no es necesariamente proporcional a la biomasa desovante. Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas 2010-10-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/1779 10.7773/cm.v37i4B.1779 Ciencias Marinas; Vol. 37 No. 4B (2011); 565-584 Ciencias Marinas; Vol. 37 Núm. 4B (2011); 565-584 2395-9053 0185-3880 eng https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/1779/1693 ['Redalyc'] redalyc_48021256005 Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity ['Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity', 'C Nunes', 'Ciencias de la Tierra', 'Iberian waters', 'batch fecundity', 'Atlantic sardine', 'spawning fraction', 'annual population fecundity', 'Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity C Nunes A Silva V Marques K Ganias Ciencias de la Tierra Iberian waters batch fecundity Atlantic sardine spawning fraction annual population fecundity Spatial and temporal variability in reproductive parameters was studied in combination with population demography to estimate sardine (Sardina pilchardus) population annual fecundity, as an indicator of its reproductive potential. Samples collected from commercial landings were used to determine the monthly proportion of active females and the duration of the spawning season, while data obtained during the 2002, 2005, and 2008 Daily Egg Production Method surveys were used to analyze the relationship between reproductive parameters (batch fecundity, spawning fraction) and individual biological characteristics (length, gutted weight, condition) for the west and south coasts of Portugal by generalized linear models. Population abundances and biological characteristics obtained per length class during acoustic surveys were subsequently used to integrate individual egg production to population demography. At the individual level, results indicated that the duration of the reproductive season was size-dependent, being shorter for smaller sardines. Batch fecundity was positively related to body size and differed significantly between the years and areas studied, with higher values on the west coast and an increasing trend towards the 2007/2008 spawning season. Mean values of spawning fraction varied significantly with space and time but the poor explanatory relationship obtained by the modelling of the spawning fraction against the individual biological characteristics did not allow the clarification of the factors affecting sardine spawning activity. At the population level, the differences obtained in egg production were found to be related to changes in population abundances as well as to the demographic structure, as larger females contributed proportionally more to the population annual fecundity. These results are in accordance with numerous recent studies indicating that the population reproductive potential may not always be proportional to the spawning biomass. 2011 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48021256005 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4B Vol.37'] ['C Nunes'] ['C Nunes'] ['Artículo científico'] ['2011'] ['Universidad Autónoma de Baja California'] ['en'] ['Ciencias de la Tierra', 'Iberian waters', 'batch fecundity', 'Atlantic sardine', 'spawning fraction', 'annual population fecundity'] ['https://www.redalyc.org/articulo.oa?id=48021256005'] ['Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity C Nunes A Silva V Marques K Ganias Ciencias de la Tierra Iberian waters batch fecundity Atlantic sardine spawning fraction annual population fecundity Spatial and temporal variability in reproductive parameters was studied in combination with population demography to estimate sardine (Sardina pilchardus) population annual fecundity, as an indicator of its reproductive potential. Samples collected from commercial landings were used to determine the monthly proportion of active females and the duration of the spawning season, while data obtained during the 2002, 2005, and 2008 Daily Egg Production Method surveys were used to analyze the relationship between reproductive parameters (batch fecundity, spawning fraction) and individual biological characteristics (length, gutted weight, condition) for the west and south coasts of Portugal by generalized linear models. Population abundances and biological characteristics obtained per length class during acoustic surveys were subsequently used to integrate individual egg production to population demography. At the individual level, results indicated that the duration of the reproductive season was size-dependent, being shorter for smaller sardines. Batch fecundity was positively related to body size and differed significantly between the years and areas studied, with higher values on the west coast and an increasing trend towards the 2007/2008 spawning season. Mean values of spawning fraction varied significantly with space and time but the poor explanatory relationship obtained by the modelling of the spawning fraction against the individual biological characteristics did not allow the clarification of the factors affecting sardine spawning activity. At the population level, the differences obtained in egg production were found to be related to changes in population abundances as well as to the demographic structure, as larger females contributed proportionally more to the population annual fecundity. These results are in accordance with numerous recent studies indicating that the population reproductive potential may not always be proportional to the spawning biomass. 2011 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48021256005 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4B Vol.37'] |
| spellingShingle | Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity C Nunes Ciencias de la Tierra Iberian waters batch fecundity Atlantic sardine spawning fraction annual population fecundity Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity C Nunes A Silva V Marques K Ganias Ciencias de la Tierra Iberian waters batch fecundity Atlantic sardine spawning fraction annual population fecundity Spatial and temporal variability in reproductive parameters was studied in combination with population demography to estimate sardine (Sardina pilchardus) population annual fecundity, as an indicator of its reproductive potential. Samples collected from commercial landings were used to determine the monthly proportion of active females and the duration of the spawning season, while data obtained during the 2002, 2005, and 2008 Daily Egg Production Method surveys were used to analyze the relationship between reproductive parameters (batch fecundity, spawning fraction) and individual biological characteristics (length, gutted weight, condition) for the west and south coasts of Portugal by generalized linear models. Population abundances and biological characteristics obtained per length class during acoustic surveys were subsequently used to integrate individual egg production to population demography. At the individual level, results indicated that the duration of the reproductive season was size-dependent, being shorter for smaller sardines. Batch fecundity was positively related to body size and differed significantly between the years and areas studied, with higher values on the west coast and an increasing trend towards the 2007/2008 spawning season. Mean values of spawning fraction varied significantly with space and time but the poor explanatory relationship obtained by the modelling of the spawning fraction against the individual biological characteristics did not allow the clarification of the factors affecting sardine spawning activity. At the population level, the differences obtained in egg production were found to be related to changes in population abundances as well as to the demographic structure, as larger females contributed proportionally more to the population annual fecundity. These results are in accordance with numerous recent studies indicating that the population reproductive potential may not always be proportional to the spawning biomass. 2011 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48021256005 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4B Vol.37 |
| title | Integrating fish size, condition, and population demography in the estimation of Atlantic sardine annual fecundity |
| title_alt | Integración de la talla, condición y demografía poblacional en la estimación de la fecundidad anual de la sardina iberoatlántica |
| topic | Ciencias de la Tierra Iberian waters batch fecundity Atlantic sardine spawning fraction annual population fecundity |
| url | https://www.redalyc.org/articulo.oa?id=48021256005 https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/1779 |