Southern coastal system of the San Jorge Gulf during spring
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 o...
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| Format: | Article |
| Language: | English |
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Asociación Argentina de Ecología
2023-04-01
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| Series: | Ecología Austral |
| Subjects: | |
| Online Access: | https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1994 |
| _version_ | 1797632864078004224 |
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| author | Regina Pierattini Martínez Juan P. Pisoni Flavio E. Paparazzo |
| author_facet | Regina Pierattini Martínez Juan P. Pisoni Flavio E. Paparazzo |
| author_sort | Regina Pierattini Martínez |
| collection | DOAJ |
| description |
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 pattern 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 bottom layers were similar. At offshore stations, the water column was stratified and the nutrient concentrations were higher near the bottom 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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| first_indexed | 2024-03-11T11:43:54Z |
| format | Article |
| id | doaj.art-a8d7469fd2134c2fa70a25510e0bf162 |
| institution | Directory Open Access Journal |
| issn | 0327-5477 1667-782X |
| language | English |
| last_indexed | 2024-03-11T11:43:54Z |
| publishDate | 2023-04-01 |
| publisher | Asociación Argentina de Ecología |
| record_format | Article |
| series | Ecología Austral |
| spelling | doaj.art-a8d7469fd2134c2fa70a25510e0bf1622023-11-09T21:15:42ZengAsociación Argentina de EcologíaEcología Austral0327-54771667-782X2023-04-0133210.25260/EA.23.33.2.0.19941672Southern coastal system of the San Jorge Gulf during springRegina Pierattini Martínez0Juan P. Pisoni1Flavio E. Paparazzo2Centro para el Estudio de Sistemas Marinos, CESIMAR-CONICET. Instituto Patagónico del Mar, IPaM-UNPSJBCentro para el Estudio de Sistemas Marinos, CESIMAR-CONICET. Instituto Patagónico del Mar, IPaM-UNPSJBCentro para el Estudio de Sistemas Marinos, CESIMAR-CONICET. Instituto Patagónico del Mar, IPaM-UNPSJB 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 pattern 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 bottom layers were similar. At offshore stations, the water column was stratified and the nutrient concentrations were higher near the bottom 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. https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1994frontsmacronutrientsbiological productionupwellingSan Jorge Gulf |
| spellingShingle | Regina Pierattini Martínez Juan P. Pisoni Flavio E. Paparazzo Southern coastal system of the San Jorge Gulf during spring Ecología Austral fronts macronutrients biological production upwelling San Jorge Gulf |
| title | Southern coastal system of the San Jorge Gulf during spring |
| title_full | Southern coastal system of the San Jorge Gulf during spring |
| title_fullStr | Southern coastal system of the San Jorge Gulf during spring |
| title_full_unstemmed | Southern coastal system of the San Jorge Gulf during spring |
| title_short | Southern coastal system of the San Jorge Gulf during spring |
| title_sort | southern coastal system of the san jorge gulf during spring |
| topic | fronts macronutrients biological production upwelling San Jorge Gulf |
| url | https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1994 |
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