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	Provedor de dados OMA (3) Boletín de Investigaciones (2) Autor Dehairs, F.A. (3) Goeyens, L. (3) Baeyens, W.F.J. (1) Bauman, E.M. (1) Baumann, M.E.M. (1) Cedeño-Posso,Cristina (1) Dorado-Roncancio,Edgar Fernando (1) Elskens, M. (1) Giraldo,Alan (1) Kopczynska, E.E. (1) Lancelot, C. (1) Mojica-Moncada,Diego F. (1) Ober, S. (1) Rivera-Gómez,Marisol (1) Semeneh, M. (1) Shopova, D. (1) Tréguer, P. (1) Veth, C. (1) Mais... Palavra-chave Antarctic Ocean (5) Algal blooms Ammonium compounds Ice cover Marginal seas Nitrogen cycle Phytoplankton Primary production PS (1) Austral summer. (1) Barium Biogeochemical cycle Carbon cycle Mixed layer Oxygen consumption Primary production PSW (1) Biogeochemical cycle Biomass Community composition Continental shelves Ice edge Nitrogen Pelagic environment Phytoplankton Size distribution Uptake PS (1) Dimophyes arctica (1) Diversity (1) Euphausiacea (1) Metridia gerlachei (1) Salinity (1) Southern Ocean PSE (1) Temperature (1) Zooplankton (1) Mais... Tipo do documento Info:eu-repo/semantics/article (5) Ano 2021 (2) 1998 (1) 1997 (1) 1995 (1) País Belgium (3) Colombia (2) Idioma Inglês (5)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Epipelagic euphausiids assemblage in the Gerlache Strait (Antarctic Peninsula) during January 2015 Boletín de Investigaciones Rivera-Gómez,Marisol; Giraldo,Alan; Mojica-Moncada,Diego F.. ABSTRACT The spatial distribution of the epipelagic Euphausiids was investigated during the first Colombian Scientific Expedition to Antarctica -Expedición Caldas- in the Gerlache Strait during the austral summer of 2015. Surface zooplankton was collected at 20 oceanographic stations with a simple conical net of 0.6 m in diameter mouth and 200 µm of mesh net. Four euphausiid species were collected in 70 % of the sampling stations: Euphausia crystallorophias Holt and Tattersall 1906, Euphausia superba Dana 1850, Thysanoessa sp. and Thysanoessa macrura Sars 1883. Euphausia crystallorophias was the most abundant species with maximum density of 818 ind 1000 m-3 associated with the entrance of the Wilhelmina Bay, in the central area of the Gerlache Strait. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Euphausiacea; Temperature; Salinity; Antarctic Ocean; Austral summer.. Ano: 2021 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300129 Copepods, hydromedusae and siphonophores: Diversity and distribution in the Gerlache Strait, Antarctic Peninsula Boletín de Investigaciones Dorado-Roncancio,Edgar Fernando; Cedeño-Posso,Cristina. ABSTRACT Project Biodiversity and oceanographic conditions of the strait of Gerlache “Biogerlache-Antarctica”, aims to carry out the characterization of the Antarctic fauna of the strait, generating new contributions to the biological inventories of Antarctica. Present work focuses on the biodiversity of the zooplanktonic community, specifically on copepods, hydromedusae and siphonophorae collected during the III Antarctic Expedition of Colombia “Admiral Padilla” (2016-2017). Sampling was carried out in seven oceanographic stations located along the Gerlache strait, with vertical trawls between the maximum depth of the station and the surface. 4100 organisms belonging to 38 species of the phylum Arthropoda (Orders Calanoid and Cyclopoid) and 10 species of... Tipo: Info:eu-repo/semantics/article Palavras-chave: Antarctic Ocean; Zooplankton; Diversity; Metridia gerlachei; Dimophyes arctica. Ano: 2021 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300169 The leading role of ammonium in the nitrogen uptake regime of Southern Ocean marginal ice zones OMA Goeyens, L.; Dehairs, F.A.; Tréguer, P.; Bauman, E.M.; Baeyens, W.F.J.. The nitrogen signature of marginal ice zones in the Southern Ocean often departs from the "classical" Antarctic nutrient profiles with high nitrate and low ammonium values in the surface layer. Weddell Sea marginal ice zones e.g. show enhanced nitrate depletions, amounting to similar to 500 mmol N m super(-2). Additionally, ammonium stocks in the upper layer can be up to 7% of the inorganic nitrogen pool. The corresponding nitrogen uptake regime suggests elevated nitrate assimilation during the early phase of the productive season and significantly reduced nitrate assimilation at a later stage. Absolute as well as specific nitrate uptake rates decrease by an order of magnitude when ammonium stocks exceed 1.7% of the total inorganic nitrogen. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Algal blooms Ammonium compounds Ice cover Marginal seas Nitrogen cycle Phytoplankton Primary production PS; Antarctic Ocean. Ano: 1995 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10188 Nitrogen uptake regime and phytoplankton community structure in the Atlantic and Indian sectors of the Southern Ocean OMA Semeneh, M.; Dehairs, F.A.; Elskens, M.; Baumann, M.E.M.; Kopczynska, E.E.; Lancelot, C.; Goeyens, L.. Phytoplankton nitrogen uptake is studied in relation to the biomass and structure of phytoplankton community in the Atlantic and Indian sectors of the Southern Ocean. Two scenarios of seasonal evolution of uptake regime and phytoplankton community structure are described. The first scenario includes the Marginal Ice Zone areas of the Weddell Sea and adjacent areas where a predominantly nitrate based, diatom dominated assemblage, thriving in a stable water column at the beginning of the season was transformed into a mainly ammonium based, flagellate dominated assemblage, towards the end of the season. The change in phytoplankton community structure was caused by selective grazing by large grazers and reduced stability of the water column and the shift in... Tipo: Info:eu-repo/semantics/article Palavras-chave: Biogeochemical cycle Biomass Community composition Continental shelves Ice edge Nitrogen Pelagic environment Phytoplankton Size distribution Uptake PS; Southern Ocean PSE; Antarctic Ocean. Ano: 1998 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10255 Particulate barium stocks and oxygen consumption in the Southern Ocean mesopelagic water column during spring and early summer OMA Dehairs, F.A.; Shopova, D.; Ober, S.; Veth, C.; Goeyens, L.. Particulate barium was analysed in the upper 600 m of the Southern Ocean water column during repeated transects along the 6 degree W meridian in October-November 1992. The transects extended between the northern edge of the Weddell Gyre (57 degree 30'S) in the south to 47 degree S within the Polar Front Zone (PFZ) in the north. From earlier studies, it is known that the largest fraction of Ba in oceanic suspended matter occurs as barite micro-crystals. In the PFZ, an increase in the particulate Ba content in surface waters and at mesopelagic depths can be significant over the investigation period (1 month) and follows the increase of primary production during bloom development. Using an inverse one-dimensional advection-diffusion-consumption model,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Barium Biogeochemical cycle Carbon cycle Mixed layer Oxygen consumption Primary production PSW; Antarctic Ocean. Ano: 1997 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10209 Registros recuperados: 5 Primeira ... 1 ... Última

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