Biogeochemical features along the northern and central Patagonian shelf during a spring cruise: implications for biological productivity

•We report biogeochemical patterns across the Patagonian continental shelf.•Three macrozones were identified by nutrient concentration and hydrological gradients.•Highest nitrate uptake and new primary production occurred in northern oceanic waters.•Southern shelf waters were dominated by ammonium u...

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Vydáno v:	Progress in oceanography Ročník 236; s. 103511
Hlavní autoři:	Valdés-Castro, Valentina, Narváez, Diego A., Gutiérrez, Marcelo H., Pantoja-Gutiérrez, Silvio, Fernández, Camila
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Elsevier Ltd 01.08.2025 Elsevier
Témata:	ammonium anthropogenic activities biogeochemistry C and N biogeochemical cycles carbon Chile chlorophyll climate change continental shelf Environmental Sciences hydrology N assimilation nitrates oceanography organic matter oxygen Pacific Ocean Patagonian fjords Primary production primary productivity salinity silicic acid snowmelt spring temperature Chile Pacific Ocean N assimilation Patagonian fjords C and N biogeochemical cycles Primary production
ISSN:	0079-6611
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Abstract	•We report biogeochemical patterns across the Patagonian continental shelf.•Three macrozones were identified by nutrient concentration and hydrological gradients.•Highest nitrate uptake and new primary production occurred in northern oceanic waters.•Southern shelf waters were dominated by ammonium uptake and recycled production. The Patagonian fjords, channels, and glacial meltwater plays a key role in shaping the hydrography and biogeochemistry of the Southeastern Pacific Ocean, through substantial exchanges with open ocean waters. However, the continental shelf between 46°S and 48°S remains less explored, leaving critical gaps in our understanding of nutrient dynamics and productivity patterns. This study investigates latitudinal gradients in water column biogeochemistry and productivity in northern and central Chilean Patagonia during the austral spring of 2018. We identified three distinct zones: a northern area (41°S and 46°S) with higher temperature, salinity, dissolved oxygen, and chlorophyll-a concentrations; an exchange zone between Guafo entrance and Moraleda Channel, characterized by elevated inorganic nutrient concentrations; and a southern area (46°S and 48°S) with increased ammonium concentrations and the lowest silicic acid levels. Offshore stations in the northern area exhibited the highest integrated primary production rates (up to 6.3 g C m−2 d−1), primarily sustained by nitrate uptake (ƒ ratios up to 0.98). In contrast, the southern area showed a preference for ammonium assimilation, with lower ƒ ratios (0.1–0.3). These findings suggest that the northern area supports a high proportion of new primary production, which likely enhances organic matter export and the efficiency of the biological pump, whereas regenerated production in the southern area may limit carbon export potential. Our study provides the first large-scale description of the biogeochemical features of the Patagonian continental shelf, particularly around the Taitao Peninsula, offering a critical baseline for understanding biogeochemical processes in this region and its potential responses to climate change and anthropogenic pressure.
AbstractList	The Patagonian fjords, channels, and glacial meltwater plays a key role in shaping the hydrography and biogeochemistry of the Southeastern Pacific Ocean, through substantial exchanges with open ocean waters. However, the continental shelf between 46°S and 48°S remains less explored, leaving critical gaps in our understanding of nutrient dynamics and productivity patterns. This study investigates latitudinal gradients in water column biogeochemistry and productivity in northern and central Chilean Patagonia during the austral spring of 2018. We identified three distinct zones: a northern area (41°S and 46°S) with higher temperature, salinity, dissolved oxygen, and chlorophyll-a concentrations; an exchange zone between Guafo entrance and Moraleda Channel, characterized by elevated inorganic nutrient concentrations; and a southern area (46°S and 48°S) with increased ammonium concentrations and the lowest silicic acid levels. Offshore stations in the northern area exhibited the highest integrated primary production rates (up to 6.3 g C m⁻² d⁻¹), primarily sustained by nitrate uptake (ƒ ratios up to 0.98). In contrast, the southern area showed a preference for ammonium assimilation, with lower ƒ ratios (0.1–0.3). These findings suggest that the northern area supports a high proportion of new primary production, which likely enhances organic matter export and the efficiency of the biological pump, whereas regenerated production in the southern area may limit carbon export potential. Our study provides the first large-scale description of the biogeochemical features of the Patagonian continental shelf, particularly around the Taitao Peninsula, offering a critical baseline for understanding biogeochemical processes in this region and its potential responses to climate change and anthropogenic pressure. •We report biogeochemical patterns across the Patagonian continental shelf.•Three macrozones were identified by nutrient concentration and hydrological gradients.•Highest nitrate uptake and new primary production occurred in northern oceanic waters.•Southern shelf waters were dominated by ammonium uptake and recycled production. The Patagonian fjords, channels, and glacial meltwater plays a key role in shaping the hydrography and biogeochemistry of the Southeastern Pacific Ocean, through substantial exchanges with open ocean waters. However, the continental shelf between 46°S and 48°S remains less explored, leaving critical gaps in our understanding of nutrient dynamics and productivity patterns. This study investigates latitudinal gradients in water column biogeochemistry and productivity in northern and central Chilean Patagonia during the austral spring of 2018. We identified three distinct zones: a northern area (41°S and 46°S) with higher temperature, salinity, dissolved oxygen, and chlorophyll-a concentrations; an exchange zone between Guafo entrance and Moraleda Channel, characterized by elevated inorganic nutrient concentrations; and a southern area (46°S and 48°S) with increased ammonium concentrations and the lowest silicic acid levels. Offshore stations in the northern area exhibited the highest integrated primary production rates (up to 6.3 g C m−2 d−1), primarily sustained by nitrate uptake (ƒ ratios up to 0.98). In contrast, the southern area showed a preference for ammonium assimilation, with lower ƒ ratios (0.1–0.3). These findings suggest that the northern area supports a high proportion of new primary production, which likely enhances organic matter export and the efficiency of the biological pump, whereas regenerated production in the southern area may limit carbon export potential. Our study provides the first large-scale description of the biogeochemical features of the Patagonian continental shelf, particularly around the Taitao Peninsula, offering a critical baseline for understanding biogeochemical processes in this region and its potential responses to climate change and anthropogenic pressure.
ArticleNumber	103511
Author	Fernández, Camila Valdés-Castro, Valentina Pantoja-Gutiérrez, Silvio Narváez, Diego A. Gutiérrez, Marcelo H.
Author_xml	– sequence: 1 givenname: Valentina surname: Valdés-Castro fullname: Valdés-Castro, Valentina email: valentinavaldes@oceanografia.udec.cl organization: Departamento de Oceanografía and Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile – sequence: 2 givenname: Diego A. surname: Narváez fullname: Narváez, Diego A. organization: Departamento de Oceanografía and Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile – sequence: 3 givenname: Marcelo H. surname: Gutiérrez fullname: Gutiérrez, Marcelo H. organization: Departamento de Oceanografía and Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile – sequence: 4 givenname: Silvio surname: Pantoja-Gutiérrez fullname: Pantoja-Gutiérrez, Silvio organization: Departamento de Oceanografía and Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile – sequence: 5 givenname: Camila surname: Fernández fullname: Fernández, Camila organization: Departamento de Oceanografía and Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile
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Cites_doi	10.1016/j.pocean.2014.09.008 10.1016/j.pocean.2007.08.013 10.1016/j.dsr.2004.07.016 10.1016/j.ecss.2017.09.027 10.1016/j.ecss.2007.05.015 10.1139/f99-128 10.3354/meps099239 10.3389/fmars.2018.00360 10.1146/annurev-marine-010213-135126 10.4319/lo.1986.31.4.0673 10.3390/rs16091482 10.1016/j.pocean.2019.02.012 10.1016/j.dsr2.2008.12.013 10.3389/fmicb.2021.772900 10.1111/raq.12337 10.1146/annurev-marine-120308-081019 10.3389/fmars.2021.612386 10.1016/j.pocean.2014.08.003 10.1016/j.aquaculture.2017.12.048 10.1080/15230430.2018.1525186 10.1016/j.pocean.2018.10.014 10.5194/bg-16-3777-2019 10.3354/aei00212 10.1007/s10661-012-2925-1 10.1016/j.pocean.2014.10.004 10.1016/j.csr.2008.09.012 10.3389/fmars.2022.800325 10.3389/fmars.2021.613265 10.1016/j.pocean.2019.01.004 10.1515/popore-2017-0013 10.3354/meps07357 10.1016/j.ecss.2008.12.009 10.1029/97GB00077 10.1016/j.dsr2.2006.07.009 10.3354/meps08360 10.3389/fmars.2020.602002 10.1029/2022GB007688 10.1093/plankt/17.6.1307 10.1016/j.csr.2010.10.013 10.1016/j.scitotenv.2018.11.445 10.1002/2017JG003907 10.1002/9783527613984 10.1016/j.pocean.2013.06.003 10.1016/j.csr.2010.08.010 10.1038/282677a0 10.1016/j.pocean.2009.07.010 10.1002/2014GB004904 10.1016/j.jmarsys.2024.103993 10.1016/j.scitotenv.2021.149241 10.1016/S0304-4203(99)00038-9 10.1016/S0921-8181(00)00052-7 10.1016/j.earscirev.2020.103145 10.1038/nature05392 10.4319/lo.1967.12.2.0196 10.3354/meps09683 10.3389/fmars.2020.00332 10.3354/meps105203 10.4319/lo.1982.27.4.0639 10.1016/j.dsr2.2004.05.001 10.1016/j.csr.2010.08.008
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Keywords	N assimilation Patagonian fjords C and N biogeochemical cycles Primary production
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Snippet	•We report biogeochemical patterns across the Patagonian continental shelf.•Three macrozones were identified by nutrient concentration and hydrological... The Patagonian fjords, channels, and glacial meltwater plays a key role in shaping the hydrography and biogeochemistry of the Southeastern Pacific Ocean,...
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SubjectTerms	ammonium anthropogenic activities biogeochemistry C and N biogeochemical cycles carbon Chile chlorophyll climate change continental shelf Environmental Sciences hydrology N assimilation nitrates oceanography organic matter oxygen Pacific Ocean Patagonian fjords Primary production primary productivity salinity silicic acid snowmelt spring temperature
Title	Biogeochemical features along the northern and central Patagonian shelf during a spring cruise: implications for biological productivity
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