Mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in San Jorge Gulf, Argentina

Little is known about the base of the food web that could support the high productivity and marine biodiversity found in San Jorge Gulf, Patagonia, Argentina. Here we examine the key components of the microbial food web, including the standing stock and physiological state of the phytoplankton in th...

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Detalles Bibliográficos
Autores principales:	Latorre, Maite Pilmayquen, Schloss, Irene Ruth, Almandoz, Gastón Osvaldo, Lemarchand, Karine, Flores Melo, Elizabeth Ximena, Massé Beaulne, Valérie, Ferreyra, Gustavo Adolfo
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2018
Materias:	Ciencias Naturales Argentine Sea Phytoplankton Water column structure Nitrate San Jorge Gulf
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/101706 https://ri.conicet.gov.ar/11336/89753 https://tos.org/oceanography/article/mixing-processes-at-the-pycnocline-and-vertical-nitrate-supply-consequences
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-101706
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Naturales Argentine Sea Phytoplankton Water column structure Nitrate San Jorge Gulf
spellingShingle	Ciencias Naturales Argentine Sea Phytoplankton Water column structure Nitrate San Jorge Gulf Latorre, Maite Pilmayquen Schloss, Irene Ruth Almandoz, Gastón Osvaldo Lemarchand, Karine Flores Melo, Elizabeth Ximena Massé Beaulne, Valérie Ferreyra, Gustavo Adolfo Mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in San Jorge Gulf, Argentina
topic_facet	Ciencias Naturales Argentine Sea Phytoplankton Water column structure Nitrate San Jorge Gulf
description	Little is known about the base of the food web that could support the high productivity and marine biodiversity found in San Jorge Gulf, Patagonia, Argentina. Here we examine the key components of the microbial food web, including the standing stock and physiological state of the phytoplankton in the context of key oceanographic variables in the gulf. Water samples were collected at 16 stations for biological and chemical analyses, together with measurements of vertical structure and currents. The dynamics of the water column and its impact on nutrient availability for primary producers was evaluated. Our results show that, in spite of the observed low surface nutrient concentrations and low biomass, phytoplankton cells were in good physiological state. This is possible because nutrients are replenished at the pycnocline depth, as estimated by means of Richardson’s dynamic stability. Turbulence created by tides and the shear between overlapping water masses favors the disruption of the pycnocline. We suggest that, during summer, San Jorge Gulf maintains not only high primary productivity but also high phytoplankton biomass turnover rate, which is supported by a high C:N ratio, consistent with strong zooplankton grazing and export of organic carbon to deep waters.
format	Articulo Articulo
author	Latorre, Maite Pilmayquen Schloss, Irene Ruth Almandoz, Gastón Osvaldo Lemarchand, Karine Flores Melo, Elizabeth Ximena Massé Beaulne, Valérie Ferreyra, Gustavo Adolfo
author_facet	Latorre, Maite Pilmayquen Schloss, Irene Ruth Almandoz, Gastón Osvaldo Lemarchand, Karine Flores Melo, Elizabeth Ximena Massé Beaulne, Valérie Ferreyra, Gustavo Adolfo
author_sort	Latorre, Maite Pilmayquen
title	Mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in San Jorge Gulf, Argentina
title_short	Mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in San Jorge Gulf, Argentina
title_full	Mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in San Jorge Gulf, Argentina
title_fullStr	Mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in San Jorge Gulf, Argentina
title_full_unstemmed	Mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in San Jorge Gulf, Argentina
title_sort	mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in san jorge gulf, argentina
publishDate	2018
url	http://sedici.unlp.edu.ar/handle/10915/101706 https://ri.conicet.gov.ar/11336/89753 https://tos.org/oceanography/article/mixing-processes-at-the-pycnocline-and-vertical-nitrate-supply-consequences
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bdutipo_str	Repositorios
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Mixing processes at the pycnocline and vertical nitrate supply: consequences for the microbial food web in San Jorge Gulf, Argentina

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