A Strong Link Between Oceanographic Conditions and Zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N Values in the San Jorge Gulf, Argentina
Maps of (baseline) δ<sup>13</sup>C and δ<sup>15</sup>N values of primary producers or consumers near the base of food webs provide crucial information for interpreting patterns in the isotopic composition of consumers that occupy higher trophic levels. In marine systems, unde...
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2024-11-01
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| author | David Edgardo Galván Manuela Funes Flavio Emiliano Paparazzo Virginia Alonso Roldán Carla Derisio Juan Pablo Pisoni Brenda Temperoni Daniela Alejandra del Valle Valeria Segura Seth D. Newsome |
| author_facet | David Edgardo Galván Manuela Funes Flavio Emiliano Paparazzo Virginia Alonso Roldán Carla Derisio Juan Pablo Pisoni Brenda Temperoni Daniela Alejandra del Valle Valeria Segura Seth D. Newsome |
| author_sort | David Edgardo Galván |
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| description | Maps of (baseline) δ<sup>13</sup>C and δ<sup>15</sup>N values of primary producers or consumers near the base of food webs provide crucial information for interpreting patterns in the isotopic composition of consumers that occupy higher trophic levels. In marine systems, understanding how oceanographic variables influence these values enables the creation of dynamic isoscapes across time and space, providing insights into how ecosystems function. The San Jorge Gulf (SJG) in the southwest Atlantic Ocean (45° S–47° S) is an area of particular importance, as it is located on one of the most productive continental shelves in the world, supporting large fisheries and marine mammal and seabird populations. We reconstructed spatial variation in zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N values across SJG and investigated their relationship with physical and chemical oceanographic conditions. During cruises in the austral spring of 2016 and 2017, we collected medium-sized copepods whose isotopic composition integrate short-term (days to weeks) variation in oceanographic conditions recorded by phytoplankton at the base of the food web. We also collected data on water column depth, surface and bottom temperatures, water column stability, and macronutrient (nitrate, phosphate, and silicic acid) concentrations. The results revealed significant variation in both δ<sup>13</sup>C and δ<sup>15</sup>N values of up to 7-8‰ over a relatively small spatial scale (200–300 km). Copepod δ<sup>13</sup>C values were lower at the center of the SJG, showing an inverse correlation with water column stability, surface nitrate concentration, and water column depth. δ<sup>15</sup>N values showed a strong and negative relationship with surface nitrate concentration and water column stability, increasing from south to north in the SJG. δ<sup>15</sup>N values also showed a positive relationship with surface silicic acid concentration. These spatial patterns in nutrient dynamics and copepod carbon and nitrogen isotope values are interpreted in the context of the dominant northward current and temporal development of the frontal systems in the SJG. |
| format | Article |
| id | doaj-art-61317fb30d40422e86ef37501b54b8cd |
| institution | Kabale University |
| issn | 2079-7737 |
| language | English |
| publishDate | 2024-11-01 |
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| spelling | doaj-art-61317fb30d40422e86ef37501b54b8cd2024-12-27T14:11:56ZengMDPI AGBiology2079-77372024-11-01131299010.3390/biology13120990A Strong Link Between Oceanographic Conditions and Zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N Values in the San Jorge Gulf, ArgentinaDavid Edgardo Galván0Manuela Funes1Flavio Emiliano Paparazzo2Virginia Alonso Roldán3Carla Derisio4Juan Pablo Pisoni5Brenda Temperoni6Daniela Alejandra del Valle7Valeria Segura8Seth D. Newsome9Centro para el Estudio de Sistemas Marinos (CESIMAR-CONICET), Boulevard Brown 2915, Puerto Madryn U9120ACD, ArgentinaInstituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP-CONICET), Juan B. Justo 2550, Mar del Plata B7608FBY, ArgentinaCentro para el Estudio de Sistemas Marinos (CESIMAR-CONICET), Boulevard Brown 2915, Puerto Madryn U9120ACD, ArgentinaGrupo de Investigación en Gestión Desarrollo Territorial y Ambiente (GesDTA-UTNFRCH), Facultad Regional Chubut, Universidad Tecnológica Nacional, Av. del Trabajo 1536, Puerto Madryn U9120QGQ, ArgentinaInstituto Nacional de Investigación y Desarrollo Pesquero, Paseo Victoria Ocampo Nº1, Mar del Plata B7602HSA, ArgentinaCentro para el Estudio de Sistemas Marinos (CESIMAR-CONICET), Boulevard Brown 2915, Puerto Madryn U9120ACD, ArgentinaInstituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP-CONICET), Juan B. Justo 2550, Mar del Plata B7608FBY, ArgentinaInstituto Nacional de Investigación y Desarrollo Pesquero, Paseo Victoria Ocampo Nº1, Mar del Plata B7602HSA, ArgentinaInstituto Nacional de Investigación y Desarrollo Pesquero, Paseo Victoria Ocampo Nº1, Mar del Plata B7602HSA, ArgentinaBiology Department, University of New Mexico, Albuquerque, NM 87131-0001, USAMaps of (baseline) δ<sup>13</sup>C and δ<sup>15</sup>N values of primary producers or consumers near the base of food webs provide crucial information for interpreting patterns in the isotopic composition of consumers that occupy higher trophic levels. In marine systems, understanding how oceanographic variables influence these values enables the creation of dynamic isoscapes across time and space, providing insights into how ecosystems function. The San Jorge Gulf (SJG) in the southwest Atlantic Ocean (45° S–47° S) is an area of particular importance, as it is located on one of the most productive continental shelves in the world, supporting large fisheries and marine mammal and seabird populations. We reconstructed spatial variation in zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N values across SJG and investigated their relationship with physical and chemical oceanographic conditions. During cruises in the austral spring of 2016 and 2017, we collected medium-sized copepods whose isotopic composition integrate short-term (days to weeks) variation in oceanographic conditions recorded by phytoplankton at the base of the food web. We also collected data on water column depth, surface and bottom temperatures, water column stability, and macronutrient (nitrate, phosphate, and silicic acid) concentrations. The results revealed significant variation in both δ<sup>13</sup>C and δ<sup>15</sup>N values of up to 7-8‰ over a relatively small spatial scale (200–300 km). Copepod δ<sup>13</sup>C values were lower at the center of the SJG, showing an inverse correlation with water column stability, surface nitrate concentration, and water column depth. δ<sup>15</sup>N values showed a strong and negative relationship with surface nitrate concentration and water column stability, increasing from south to north in the SJG. δ<sup>15</sup>N values also showed a positive relationship with surface silicic acid concentration. These spatial patterns in nutrient dynamics and copepod carbon and nitrogen isotope values are interpreted in the context of the dominant northward current and temporal development of the frontal systems in the SJG.https://www.mdpi.com/2079-7737/13/12/990isoscapesstable isotopesfrontal systemssouthwest Atlantic OceanPatagonia |
| spellingShingle | David Edgardo Galván Manuela Funes Flavio Emiliano Paparazzo Virginia Alonso Roldán Carla Derisio Juan Pablo Pisoni Brenda Temperoni Daniela Alejandra del Valle Valeria Segura Seth D. Newsome A Strong Link Between Oceanographic Conditions and Zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N Values in the San Jorge Gulf, Argentina Biology isoscapes stable isotopes frontal systems southwest Atlantic Ocean Patagonia |
| title | A Strong Link Between Oceanographic Conditions and Zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N Values in the San Jorge Gulf, Argentina |
| title_full | A Strong Link Between Oceanographic Conditions and Zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N Values in the San Jorge Gulf, Argentina |
| title_fullStr | A Strong Link Between Oceanographic Conditions and Zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N Values in the San Jorge Gulf, Argentina |
| title_full_unstemmed | A Strong Link Between Oceanographic Conditions and Zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N Values in the San Jorge Gulf, Argentina |
| title_short | A Strong Link Between Oceanographic Conditions and Zooplankton δ<sup>13</sup>C and δ<sup>15</sup>N Values in the San Jorge Gulf, Argentina |
| title_sort | strong link between oceanographic conditions and zooplankton δ sup 13 sup c and δ sup 15 sup n values in the san jorge gulf argentina |
| topic | isoscapes stable isotopes frontal systems southwest Atlantic Ocean Patagonia |
| url | https://www.mdpi.com/2079-7737/13/12/990 |
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