Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818)
In this study we analyze growth, mortality and estimated biomass trend of purple clam, Amiantis purpurata, population placed in Playa Villarino, (Northern San Matias gulf, Argentina) in the southern most boundary of its geographical distribution. Previously, the population structure was described composed by three consecutive cohorts settled among 1978-1980, and the individual growth rate showed high spatial variability. The hypothesis to test in this study is that growth rate is regulated by local biomass. We choice four sites with different densities, to assess growth rate, natural mortality and retrospective estimated biomass trend. During February 2003, densities and growth rate (using external growth bands measurements) were analyzed matching with a historical time series of available data. Von Bertalanffy growth model (estimated) for each site and parameters differences between cohorts and sites were tested by likelihood ratio test. Natural mortality rate was estimated by decreasing trend of density between 1982-2003. Recruitment failure during 25 years allowed to retrocalculate historical trend of biomass in each site combining density, growth rate and mortality. Growth curves showed density-dependent effect: individuals that live in low-density sites grew faster than individuals in high density sites. Differences were significant between sites and light (or absent) between cohorts. Natural mortality rate was estimated at M= 0,126. Abundance decreased along time but biomass was almost constant. The population showed a compensatory effect between losses due to mortality with “catching-up” in growth rate, and therefore an increment of local biomass.
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| Format: | Journal Contribution biblioteca |
| Language: | Spanish / Castilian |
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Universidad Nacional del Comahue. Instituto de Biología Marina y Pesquera Almirante Storni
2005
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| Subjects: | Growth, Biomass, Growth rate, Clam fisheries, Mortality, Growth curves, Density dependence, |
| Online Access: | http://hdl.handle.net/1834/4385 |
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Growth Biomass Growth rate Clam fisheries Mortality Growth curves Density dependence Biomass Growth Biomass Growth rate Clam fisheries Mortality Growth curves Density dependence Biomass |
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Growth Biomass Growth rate Clam fisheries Mortality Growth curves Density dependence Biomass Growth Biomass Growth rate Clam fisheries Mortality Growth curves Density dependence Biomass Pappalardo, M.P. Morsan, E.M. Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818) |
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In this study we analyze growth, mortality and estimated biomass trend of purple clam, Amiantis purpurata, population placed in Playa Villarino, (Northern San Matias gulf, Argentina) in the southern most boundary of its geographical distribution. Previously, the population structure was described composed by three consecutive cohorts settled among 1978-1980, and the individual growth rate showed high spatial variability. The hypothesis to test in this study is that growth rate is regulated by local biomass. We choice four sites with different densities, to assess growth rate, natural mortality and retrospective estimated biomass trend. During February 2003, densities and growth rate (using external growth bands measurements) were analyzed matching with a historical time series of available data. Von Bertalanffy growth model (estimated) for each site and parameters differences between cohorts and sites were tested by likelihood ratio test. Natural mortality rate was estimated by decreasing trend of density between 1982-2003. Recruitment failure during 25 years allowed to retrocalculate historical trend of biomass in each site combining density, growth rate and mortality. Growth curves showed density-dependent effect: individuals that live in low-density sites grew faster than individuals in high density sites. Differences were significant between sites and light (or absent)
between cohorts. Natural mortality rate was estimated at M= 0,126. Abundance decreased along time but biomass was almost constant. The population showed a compensatory effect between losses due to mortality with “catching-up” in growth rate, and therefore an increment of local biomass. |
| format |
Journal Contribution |
| topic_facet |
Growth Biomass Growth rate Clam fisheries Mortality Growth curves Density dependence Biomass |
| author |
Pappalardo, M.P. Morsan, E.M. |
| author_facet |
Pappalardo, M.P. Morsan, E.M. |
| author_sort |
Pappalardo, M.P. |
| title |
Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818) |
| title_short |
Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818) |
| title_full |
Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818) |
| title_fullStr |
Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818) |
| title_full_unstemmed |
Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818) |
| title_sort |
regulación denso-dependiente del crecimiento individual de la almeja púrpura (amiantis purpurata, lamarck 1818) |
| publisher |
Universidad Nacional del Comahue. Instituto de Biología Marina y Pesquera Almirante Storni |
| publishDate |
2005 |
| url |
http://hdl.handle.net/1834/4385 |
| work_keys_str_mv |
AT pappalardomp regulaciondensodependientedelcrecimientoindividualdelaalmejapurpuraamiantispurpuratalamarck1818 AT morsanem regulaciondensodependientedelcrecimientoindividualdelaalmejapurpuraamiantispurpuratalamarck1818 AT pappalardomp densitydependentregulationofindividualgrowthinpurpleclamamiantispurpuratalamarck1818 AT morsanem densitydependentregulationofindividualgrowthinpurpleclamamiantispurpuratalamarck1818 |
| _version_ |
1756075392475594752 |
| spelling |
dig-aquadocs-1834-43852021-05-19T06:22:44Z Regulación denso-dependiente del crecimiento individual de la almeja púrpura (Amiantis purpurata, Lamarck 1818) Density-dependent regulation of individual growth in purple clam (Amiantis purpurata Lamarck, 1818) Pappalardo, M.P. Morsan, E.M. Growth Biomass Growth rate Clam fisheries Mortality Growth curves Density dependence Biomass In this study we analyze growth, mortality and estimated biomass trend of purple clam, Amiantis purpurata, population placed in Playa Villarino, (Northern San Matias gulf, Argentina) in the southern most boundary of its geographical distribution. Previously, the population structure was described composed by three consecutive cohorts settled among 1978-1980, and the individual growth rate showed high spatial variability. The hypothesis to test in this study is that growth rate is regulated by local biomass. We choice four sites with different densities, to assess growth rate, natural mortality and retrospective estimated biomass trend. During February 2003, densities and growth rate (using external growth bands measurements) were analyzed matching with a historical time series of available data. Von Bertalanffy growth model (estimated) for each site and parameters differences between cohorts and sites were tested by likelihood ratio test. Natural mortality rate was estimated by decreasing trend of density between 1982-2003. Recruitment failure during 25 years allowed to retrocalculate historical trend of biomass in each site combining density, growth rate and mortality. Growth curves showed density-dependent effect: individuals that live in low-density sites grew faster than individuals in high density sites. Differences were significant between sites and light (or absent) between cohorts. Natural mortality rate was estimated at M= 0,126. Abundance decreased along time but biomass was almost constant. The population showed a compensatory effect between losses due to mortality with “catching-up” in growth rate, and therefore an increment of local biomass. En este trabajo se estudió la población más austral de Amiantis purpurata, que forma un extenso banco en Playa Villarino, al norte del Golfo San Matías (Argentina). La estructura poblacional fue previamente descrita como compuesta por tres clases anuales asentadas entre 1978 y 1980, y con una tasa de crecimiento con alta variabilidad espacial. Se plantea como hipótesis que la tasa de crecimiento de A. purpurata en esta población está regulada por la biomasa local. Para ello se evaluaron crecimiento, mortalidad natural y la tendencia de la biomasa estimada en forma retrospectiva. Se seleccionaron cuatro sitios del banco de diferente densidad, que fueron muestreados en febrero de 2003. Los datos obtenidos (densidad y tasa de crecimiento a partir de la interpretación y medición de anillos externos) fueron analizados en conjunto con una serie histórica disponible. Se estimaron los parámetros de crecimiento en cada sitio para el modelo de crecimiento de von Bertalanffy, y se utilizó el test del cociente de verosimilitud para hacer comparaciones entre cohortes y entre sitios. La mortalidad natural fue estimada a través de la disminución de la densidad entre 1982 y 2003. La tendencia histórica retrospectiva de la biomasa en cada sitio fue calculada combinando densidad, tasa de crecimiento y mortalidad, dado que no hubo reclutamientos exitosos en casi 25 años. Las curvas de crecimiento se muestran afectadas por la densidad: el crecimiento es mayor en los sitios menos densos. Se encontraron diferencias significativas entre sitios y no entre cohortes. La mortalidad natural calculada fue M= 0,126. Se encontró que la abundancia disminuyó en el tiempo pero la biomasa total se mantuvo relativamente constante, aún en una gran escala de tiempo. La población compensa las pérdidas por mortalidad con una recuperación de la tasa de crecimiento, y por lo tanto con un aumento en la biomasa local. Published Amiantis purpurata, almeja púrpura, tasa de crecimiento, pesquería de almejas, mortalidad, curvas de crecimiento, biomasa 2012-09-10T14:34:37Z 2012-09-10T14:34:37Z 2005 Journal Contribution Refereed Article IBMP serie publicaciones, (4). p. 3-20 1666-4019 http://hdl.handle.net/1834/4385 es Atlántico Sudoccidental Argentina Río Negro Golfo San Matías Patagonia Universidad Nacional del Comahue. Instituto de Biología Marina y Pesquera Almirante Storni |