Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

Torres, Américo Iadran; Paparazzo, Flavio Emiliano; Williams, Gabriela Noemí; Rivas, Andrés Luján; Solis, Miriam Edith; Esteves, José Luís

doi:10.5670/oceanog.2018.407

Cited by 14 publications

(7 citation statements)

References 36 publications

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“…A large variability of macronutrient concentrations was observed, similar to those described by Akselman (1996) and Torres et al (2018) for the entire SJG in the same season of the year. Torres et al (2018) suggested that the vertical distribution of macronutrients was associated with the stability of the water column, which depends on the physical variables that regulate it. Likewise, our results showed that in the stations with stratified water column, nutrient concentrations at the surface were lower than near the bottom.…”

Section: D��supporting

confidence: 87%

“…The pH values (7.70-8.19) were similar in magnitude to those presented by Torres et al (2018) in 2016 for the entire gulf (7.5-8.2) (Table 2), showing a characteristic pattern in which the values at the surface were spread more than near the bottom. This pattern could be explained since pH is closely related to the organisms that inhabit the environment through the carbon/carbonate balance, since the process of photosynthesis uses CO 2 as a reagent for its reaction (Chen and Durbin 1994).…”

Section: D��supporting

confidence: 76%

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Southern coastal system of the San Jorge Gulf during spring

2023

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A��. The San Jorge Gulf was declared an area of national economic, commercial, conservation and diversity interest. To contribute to its study, the southern coastal sector of the gulf was characterised in physical and chemical parameters in spring campaigns (November 2016 and 2017). Samples were taken on board the oceanographic vessel Puerto Deseado in three perpendicular to the coast transects and another one to the southeast of the gulf, which crosses a thermohaline front. The perpendicular to the coast transects showed a similar pa�ern of distribution of physical and chemical properties in the water column. At nearshore stations, the water column was homogeneous and the nutrient concentrations between the surface and bo�om layers were similar. At offshore stations, the water column was stratified and the nutrient concentrations were higher near the bo�om than at surface. In 2016, a wind induced upwelling front was observed in the southwest of the gulf. Both sides of the thermohaline front did not show significant chemical differences. Throughout the study area, silicic acid and nitrate limited primary production. Satellite chlorophyll-a data and fluorescence profiles showed that the southern sector of the gulf has a high biomass of phytoplankton during November. We conclude that the southern sector of the SJG has different features depending on the external forcing caused by the front. The presence of fronts stimulates the growth of phytoplankton biomass through the injection of nutrients from the homogeneous part to the stratified sector. This would affect phytoplankton community and, thus, the productivity of the system.

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Section: D��supporting

confidence: 87%

Section: D��supporting

confidence: 76%

Southern coastal system of the San Jorge Gulf during spring

2023

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“…Because the euphotic depth coincided with the pycnocline during our study, phytoplankton remained in well-illuminated conditions, so that light was not a limiting factor for growth. Thermal stratification was strong all over the inner gulf (Torres et al, 2018, in this issue). However, some physical processes, such as wind, eddy formation, and internal waves, can disrupt the pycnocline and allow nutrients to be supplied to surface waters (Dave and Lozier, 2013).…”

Section: The Role Of Lscw In Nitrate Supply To the Sjgmentioning

confidence: 77%

“…Only nitrate+nitrite data will be analyzed in this work (hereafter "nitrates"). See Torres et al (2018, in this issue) for a detailed analysis of nutrients in the SJG.…”

Section: Chemical Analysesmentioning

confidence: 99%

Mixing Processes at the Pycnocline and Vertical Nitrate Supply: Consequences for the Microbial Food Web in San Jorge Gulf, Argentina

Latorre¹,

Schloss²,

Almandoz³

et al. 2018

Oceanog

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“…According to studies carried out in this area, the influence of tidal fronts led to high chlorophyll-a (Chl-a) concentrations south of the gulf's mouth (Romero et al 2006). On the other hand, various authors (Tonini et al 2006;Torres et al 2018;Pisoni et al 2020) have observed that coastal upwelling events in the SW of the gulf generate changes in nutrient availability (especially nitrates), boosting primary productivity (Papparazzo et al 2021). In the NE sector of the gulf, there is a high biodiversity associated with the mesoscale circulation generated by the interaction of tidal currents with the islands and topographic features of the coastal zone (Gagliardini et al 2004).…”

Section: Physical Characteristics Of the Spawning And Nursery Areasmentioning

confidence: 99%

Reclutamiento de la merluza argentina, Merluccius hubbsi, del stock patagónico: una revisión de las principales características que afectan el potencial reproductivo y la supervivencia durante las primeras etapas de la vida

et al. 2023

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Comprender las causas que generan la variabilidad del reclutamiento en las poblaciones marinas constituye uno de los mayores desafíos de la ciencia pesquera. Nuestra capacidad predictiva para explicar estas variaciones es relativamente baja, debido a la interacción de factores exógenos y endógenos, que varían en el tiempo y el espacio dentro de las poblaciones. Con el fin de obtener información sobre las fluctuaciones en el reclutamiento de la merluza argentina (Merluccius hubbsi) del stock patagónico, revisamos los resultados obtenidos analizando la ecología reproductiva, la dinámica trófica y energética durante las diferentes etapas de desarrollo de esta especie y su relación con variables ambientales. Observamos que el potencial reproductivo está fuertemente influenciado por las características parentales, particularmente de las hembras, en cuanto a su tamaño, edad y condición. Esta característica, denominada “efecto materno”, sugiere que la biomasa de la población reproductora, comúnmente utilizada como índice de productividad en la evaluación de pesquerías, es un predictor deficiente del reclutamiento. También observamos que la supervivencia durante los primeros años de vida de la merluza se ve afectada por la coincidencia espacial con el Sistema Frontal Norpatagónico, caracterizado por una alta concentración de nutrientes, alta productividad y disponibilidad de alimento. Las condiciones físicas y la densidad larvaria en la zona de crianza afectaron el estado nutricional y la mortalidad de la merluza, principalmente por competencia por alimento o depredación. Se observó que la transición del hábitat pelágico al demersal en los juveniles se produce durante un período más extenso que el reconocido anteriormente para esta especie, lo que destaca la importancia de utilizar los registros acústicos para complementar la información de las redes de arrastre de fondo. Este es uno de los principales temas a desarrollar para estimar nuevos índices de reclutamiento de merluza argentina, junto con otras líneas de investigación propuestas para mejorar la evaluación del stock.

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Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

Cited by 14 publications

References 36 publications

Southern coastal system of the San Jorge Gulf during spring

Southern coastal system of the San Jorge Gulf during spring

Mixing Processes at the Pycnocline and Vertical Nitrate Supply: Consequences for the Microbial Food Web in San Jorge Gulf, Argentina

Reclutamiento de la merluza argentina, Merluccius hubbsi, del stock patagónico: una revisión de las principales características que afectan el potencial reproductivo y la supervivencia durante las primeras etapas de la vida

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