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1. First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic)

Author

Nicolas Dubosq, Sabine Schmidt, Joël Sudre, Sylvain Rigaud, Bastien Lamarque, Martin Danilo, Antoine Grémare, and Bruno Deflandre

Subjects
deoxygenation, continental shelf, seasonal evolution, stratification, Bay of Biscay, dissolved oxygen, Science, General. Including nature conservation, geographical distribution, QH1-199.5
Abstract

Although not systematically considered as oxygen minimum zones, River-dominated Ocean Margins are sensitive to oxygen depletions. For example, the continental shelf off the Gironde, which flows into the Bay of Biscay, had not yet been studied from this perspective although recent simulations suggested that this area should already have experienced deoxygenations in recent decades. To fill this gap, profiles of temperature, salinity and dissolved oxygen were performed in the water column of the continental shelf off the Gironde during seven cruises distributed over the different seasons between 2016 and 2021. Turbidity, chlorophyll-a and pH were also measured during some of these cruises. In winter, the water column was slightly stratified due to high river flows. Then, a seasonal thermal stratification was present from spring to autumn. Similarly, dissolved oxygen showed a seasonal dynamic with: a well-oxygenated water column in winter, an oxygen oversaturation in the first 20 meters during the spring bloom, and then a progressive oxygen depletion in bottom waters until reaching an oxygen saturation minimum down to 45% in autumn. These deoxygenations are explained by the seasonal stratification that isolates the bottom waters from spring to autumn, and are likely enhanced by the advection of deoxygenated waters from the north of the Bay of Biscay and the settling of the organic matter produced in surface waters. A better understanding of these processes in the context of global warming undoubtedly requires better documentation of dissolved oxygen variability through the implementation of a long-term and continuous in situ monitoring.

Published
2022
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2. Spatial Distributions of Surface Sedimentary Organics and Sediment Profile Image Characteristics in a High-Energy Temperate Marine RiOMar: The West Gironde Mud Patch

Author

Bastien Lamarque, Bruno Deflandre, Adriana Galindo Dalto, Sabine Schmidt, Alicia Romero-Ramirez, Frédéric Garabetian, Nicolas Dubosq, Mélanie Diaz, Florent Grasso, Aldo Sottolichio, Guillaume Bernard, Hervé Gillet, Marie-Ange Cordier, Dominique Poirier, Pascal Lebleu, Hervé Derriennic, Martin Danilo, Márcio Murilo Barboza Tenório, and Antoine Grémare

Subjects
RiOMar, surface sediment, spatial distribution, sedimentary organics, bioturbation, Naval architecture. Shipbuilding. Marine engineering, VM1-989, Oceanography, GC1-1581
Abstract

The spatial distributions of (1) surface sediment characteristics (D0.5, Sediment Surface Area (SSA), Particulate Organic Carbon (POC), Chlorophyll-a (Chl-a), Phaeophytin-a (Phaeo-a), Total and Enzymatically Hydrolyzable Amino Acids (THAA, EHAA), δ13C) and (2) sediment profile image (apparent Redox Potential Discontinuity (aRPD), numbers and depths of biological traces) characteristics were quantified based on the sampling of 32 stations located within the West Gironde Mud Patch (Bay of Biscay, NE Atlantic) in view of (1) assessing the spatial structuration of a temperate river-dominated ocean margin located in a high-energy area, (2) disentangling the impacts of hydrodynamics and bottom trawling on this structuration, and (3) comparing the West Gironde Mud Patch with the Rhône River Prodelta (located in a low-energy area). Results support the subdivision of the West Gironde Mud Patch in a proximal and a distal part and show (1) the existence of depth gradients in surface sedimentary organics characteristics and bioturbation within the distal part; (2) no evidence for a significant effect of bottom trawling, as opposed to Bottom Shear Stress, on the West Gironde Mud Patch spatial structuration; and (3) major discrepancies between spatial structuration in the West Gironde Mud Patch and the Rhône River Prodelta, which were attributed to differences in tidal regimes, sedimentation processes, and local hydrodynamics, which is in agreement with current river-dominated ocean margin typologies.

Published
2021
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4. Sospecha de sarcopenia, estado nutricional y resultado clínico en pacientes cardíacos hospitalizados

Author

Higuchi, Carolina Kiyomi Shiraisi, Stuchi, Janaina do Amaral, Ribeiro, Rita de Cássia Helú Mendonça, Silva, Thiago Prado Perez da, Martin, Danilo Fernando, Machado, Maurício de Nassau, and Albertini , Sílvia Maria

Subjects
Resultados, Sarcopenia, Nutritional status, Outcome, Coronary care units, Unidades de Cuidados Coronarianos, Unidades de Cuidados Coronarios, Estado Nutricional, Desfecho
Abstract

Objectives: To identify patients with suspected sarcopenia and to assess its association with nutritional status and clinical outcome. Patients and methods: Prospective study with cardiac patients admitted to the Coronary Unit. Subjective Global Assessment (SGA), nutritional assessment by body mass index (BMI), calf circumference (CC) measurement and screening for suspected sarcopenia by SARC-CalF were performed. Results: Forty patients (27H/13M;60.2±10 years) were studied, with an average length of stay (LS) of 13.4±7.6 days, and a 7.5% prevalence of deaths. Of the 37 patients screened by SARC-CalF, 09 (24.3%) were suspected of sarcopenia. By SGA, 29 (72.5%) patients were well nourished and 11 (27.5%) malnourished/nutritional risk. According to the BMI, 25 (62.5%) were overweight, 12 (30.0%) were eutrophic and 03(7.5%) lean. SGA was more sensitive to identify well-nourished (P=0.0003) and malnourished (P=0.0367) patients. Lower mean BMI (P=0.0049) and CC (P=0.0004) were observed in those suspected of sarcopenia. The group with suspected sarcopenia had more eutrophic patients (P=0.0106), and the group without suspected higher prevalence of overweight (P=0.0006). The death outcome was more present in those at nutritional risk/malnourished by SGA (P=0.0036). There was no difference between the groups regarding LS, presence of infection, readmission and death (P>0.05). Conclusion: There was an association of suspected sarcopenia with lower means of BMI and CC. Nutritional risk or malnutrition by SGA was associated with the occurrence of deaths, but there was no association of suspected sarcopenia with the clinical outcome. Objetivos: Identificar pacientes con sospecha de sarcopenia y evaluar su asociación con el estado nutricional y el resultado clínico. Metodología: Estudio prospectivo con pacientes cardíacos ingresados en la Unidad Coronaria. Se realizó una Evaluación Global Subjetiva (SGA), una evaluación nutricional por índice de masa corporal (IMC), una medición de la circunferencia de la pantorrilla (LC) y un cribado de sospecha de sarcopenia mediante SARC-CalF. Resultados: Se estudiaron 40 pacientes (27H/13M;60,2±10 años), con tiempo de estancia (TI) 13,4±7,6 días y una prevalencia de defunciones del 7,5%. De los 37 pacientes examinados por SARC-CalF, 09 (24,3%) eran sospechosos de tener sarcopenia. Según la ASG, 29 (72,5%) pacientes estaban bien alimentados y 11 (27,5%) estaban desnutridos / riesgo nutricional. Por IMC, 25 (62,5%) tenían sobrepeso (EP), 12 (30,0%) eran eutróficos y 03 (7,5%) eran delgados. ASG fue más sensible para identificar pacientes bien nutridos (P=0,0003) y desnutridos (P=0,0367). Se observaron medias más bajas de IMC (P=0,0049) y CP (P=0,0004) en los sospechosos de sarcopenia. El grupo con sospecha de sarcopenia tenía más pacientes eutróficos (P=0,0106) y el grupo sin sospecha tenía una mayor prevalencia de EP (P=0,0006). El resultado muerte estuvo más presente en aquellos con riesgo nutricional/desnutrición según el ASG (P=0,0036). No hubo diferencias entre los grupos con respecto a la IT, la presencia de infección, el reingreso y la muerte (P>0,05). Conclusión: Hubo una asociación de sospecha de sarcopenia con menores medias de IMC y CC. La presencia de riesgo nutricional/desnutrición por SGA se asoció con la ocurrencia de muertes, pero no hubo asociación de sospecha de sarcopenia con el resultado clínico. Objetivos: Identificar pacientes com suspeita de sarcopenia e avaliar sua associação com estado nutricional e desfecho clínico. Metodologia: Estudo prospectivo com cardiopatas admitidos em Unidade Coronária. Realizou-se Avaliação Subjetiva Global (ASG), avaliação nutricional pelo índice de massa corporal (IMC), medida de circunferência de panturrilha (CP) e triagem de suspeita de sarcopenia por SARC-CalF. Resultados: Estudou-se 40 pacientes (27H/13M;60,2±10 anos), com tempo de internação (TI) 13,4±7,6 dias, e 7,5% de prevalência de óbitos. Dos 37 pacientes triados pelo SARC-CalF, 09 (24,3%) tinham suspeita de sarcopenia. Pela ASG, 29 (72,5%) pacientes eram bem nutridos e 11 (27,5%) desnutridos/risco nutricional. Pelo IMC, 25 (62,5%) tinham excesso de peso (EP), 12 (30,0%) eram eutróficos e 03 (7,5%) magros. ASG foi mais sensível para identificar pacientes bem nutridos (P=0,0003) e desnutridos (P=0,0367). Observou-se menores médias de IMC (P=0,0049) e CP (P=0,0004) naqueles suspeitos de sarcopenia. O grupo com suspeita de sarcopenia apresentou mais pacientes eutróficos (P=0,0106), e o grupo sem suspeita maior prevalência de EP (P=0,0006). O desfecho óbito foi mais presente naqueles com risco nutricional/desnutrição pela ASG (P=0,0036). Não houve diferença entre os grupos em relação ao TI, presença de infecção, reinternação e óbito (P>0,05). Conclusão: Houve associação de suspeita de sarcopenia com menores médias de IMC e CP. A presença de risco nutricional/desnutrição pela ASG associou-se à ocorrência de óbitos, porém não houve associação da suspeita de sarcopenia com o desfecho clínico.

Published
2022

6. Spatiotemporal dynamics of surface sediment characteristics and benthic macrofauna compositions in a temperate high-energy River-dominated Ocean Margin

Author

Bastien Lamarque, Bruno Deflandre, Sabine Schmidt, Guillaume Bernard, Nicolas Dubosq, Mélanie Diaz, Nicolas Lavesque, Frédéric Garabetian, Florent Grasso, Aldo Sottolichio, Sylvain Rigaud, Alicia Romero-Ramirez, Marie-Ange Cordier, Dominique Poirier, Martin Danilo, and Antoine Grémare

Subjects
Geology, Aquatic Science, Oceanography
Published
2022

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