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Coral gardens are considered to be hotspots of biodiversity and ecosystem functioning, due to the important structural and biogeochemical role of cold-water coral (CWC) species. Despite an increase in studies on deep reef-forming species, information on cold-water octocoral species is still very scarce. The present study focused on the feeding biology of two habitat-forming octocoral species typically encountered in seamounts in the Azores between 200 and 600m of depth: Dentomuricea aff. meteor and Viminella flagellum. We used an experimental approach aiming at determining the ability of the species to utilize different food sources including live phytoplankton (the diatom Chaetoceros calcitrans), Dissolved Organic Carbon (DOC) and live zooplankton (the rotifer Branchionus plicatilis). Food sources were isotopically enriched with tracers (13C, 15N) which allowed to trace the ingested food in different physiological processes, such as tissue incorporation, Dissolved Inorganic Carbon (DIC) respiration and excretion of Particulate Organic Carbon (POC) and Particulate Organic Nitrogen (PON).

Comext Download of groups of HS-8 codes for tuna; tuna loins, other prepared/preserved, frozen whole. From Cabo Verde, Ghana, Senegal and Cote d'Ivoire to EU for the period 2015 to 2019. Value in EUR and quantity in 100 kgs.

Marine enviromental data from Biogeochemical models in paper "Can we project changes in fish abundance and distribution in response to climate?" at Global Change Biology journal

Stable isotope analysis (SIA) has emerged as a valuable tool for understanding the trophic structure of the marine food web and gaining insights into trophic levels and niche. Researchers are increasingly utilizing SIA in studies focused on feeding ecology, particularly in estimating the long-term diets of meso- and bathypelagic fish. To facilitate this research, a global database of published data on stable isotopes, specifically δ13C and δ15N, of meso- and bathypelagic fish was created. The database was constructed by conducting a thorough search on Google Scholar and reviewing the references cited in the retrieved papers. The search primarily involved using popular terms such as stable isotope analysis or feeding ecology in combination with mesopelagic or bathypelagic fish. The resulting SIA database contains δ13C and δ15N values for 95 different species of meso- and bathypelagic fish, belonging to 27 families, with specimens collected between 2004 and 2015. Each entry in the database includes information on the sampling location, month and year of sample collection, taxonomic classifications (phylum, class, order, family), number of samples analyzed, as well as the reference and DOI of the original data source. This global SIA database holds significant potential as a valuable tool and data source for conducting large-scale meta-analyses.

Samples were collected during the “Acoustics along the BRAzilian COaSt (ABRACOS)” oceanographic campaigns, carried out in Austral spring (30 August - 20 September of 2015 - ABRAÇOS1; Bertrand, 2015) and fall (9 April - 9 May of 2017 - ABRAÇOS 2; Bertrand, 2017) on board the French R/V ANTEA. Spring 2015 and fall 2017 are representative of canonical spring and fall conditions in terms of thermohaline structure and currents dynamics (Assunção et al., 2020; Dossa et al., 2021). Water sampling for pigments was carried out using a rosette at four depths defined by CTD profiles: Surface, Mixed Layer, Deep Chlorophyll Maximum (DCM) (which showed a mean depth of 100 m in spring and 80 m in fall) and at 200 m. In shelf shallow stations (< 50 m depth), where no peak of fluorescence was observed, the DCM and 200 m samplings were replaced by a sampling depth at ~10 m above the bottom. For each station and sampled depth, 500 mL of water were filtered in Whatman GF/F glass fiber for the estimation of pigment concentrations of the total phytoplankton community. Size fractionation of water samples was done using 20 μm filter meshes to distinguish the pico- and nanophytoplankton from total phytoplankton pigments. Microphytoplankton fraction (> 20 μm), was estimated by the difference between total and < 20 μm fractions. Filters were stored at 80 ◦C for subsequent HPLC pigment analysis. Chemotaxonomic analysis was carried out on an Agilent Technology 1200 series HPLC following the LOV Method described in Hooker et al. (2000), to assess phytoplankton biomass and diversity. Pigments were extracted in 100% methanol in the dark for 5 min at 4◦C. Samples were then sonicated and filtered on cellulose acetate filters to remove cell debris. A 600 μl aliquot was diluted with 150 μl Milli-Q water. For the analysis, 125 μl of this solution was taken and diluted in an injection loop with 125 μl of a 28 mM solution of Tetrabutyl ammonium acetate. The pigments were then separated on a ZORBAXEclipse XDB-C8 column from Agilent Technology, with 3 mm in diameter,150 mm in length and 3.5 μm in porosity. The column temperature was maintained at 60 ◦C and the flow rate at 0.55 ml min 1. The separation was based on a linear gradient between a solution of methanol/Tetrabutyl ammonium acetate 28 mM, 70:30 (v/v), and a 100% solution of methanol. Chlorophyll-a + Divinyl Chlorophyll-a were used to determine total phytoplankton biomass (TChl-a), while all other pigment markers allowed identifying major algal groups (Table 1). The HPLC system was calibrated with external standards (DHI Water and Environment, Horsholm, Denmark).

Deep-sea sponge grounds are hotspots of benthic biomass and diversity. To date, very limited data exists on the range of environmental conditions in areas containing deep-sea sponge grounds and which factors are driving their distribution and sustenance. We investigated oceanographic conditions at a deep-sea sponge ground located on an Arctic Mid-Ocean Ridge seamount. Hydrodynamic measurements were performed along CTD transects and a lander was deployed within the sponge ground that recorded near-bottom physical properties as well as vertical fluxes of organic matter over an annual cycle. The data demonstrate that the sponge ground is found at water temperatures of -0.5 to 1 °C and is situated at the interface between two water masses at only 0.7° equatorward of the turning point latitude of semidiurnal lunar internal tides. Internal waves supported by vertical density stratification interact with the seamount topography and produce turbulent mixing as well as resuspension of organic matter with temporarily very high current speeds up to 0.72 m s-1. The vertical movement of the water column delivers food and nutrients from water layers above and below towards the sponge ground. Highest organic carbon flux was observed during the summer phytoplankton bloom period, providing fresh organic matter from the surface. The flux of fresh organic matter is unlikely to sustain the carbon demand of this ecosystem. Therefore, the availability of bacteria, nutrients and dissolved and particulate matter, delivered by tidally-forced internal wave turbulence and transport by horizontal mean flows, likely plays an important role in meeting ecosystem-level food requirements.

This dataset contain hydrodynamic and biogeochemical variables extracted from the CMEMS service (https://marine.copernicus.eu/) covering the NW region of the African coast and the period 1993 to 2019. The environmental dataset include: water temperature, water salinity, u-velocity and v-velocity.