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Trophic ecology of squids in the Benguela Upwelling System assessed through stomach content, fatty acid and stable isotopes analyses in austral spring 2021 - Stomach contents of squids
No full textSquids were collected during the research cruise SO285 on RV Sonne in the northern (nBUS) and southern (sBUS) Benguela Upwelling System between September 13 and October 8, 2021 in order to determine their trophic position and nutritional ecology. The cruise was part of the TRAFFIC (Trophic tRAnsfer eFFICiency in the Benguela Current) project. Samples were retrieved from rectangular midwater trawl (RMT) net hauls at 8 stations in the nBUS (sampling ranged from surface down to 230–600 m) and 5 stations in the sBUS (sampling ranged from surface down to 500–750 m). Furthermore, some squids were caught using hook and line in the upper two meters of the water column at 2 stations in the nBUS (ranging from 20 to 115 min per station, 4–5 rods) and 4 stations in the sBUS (ranging from 45 to 105 min per station, 4–6 rods). At 1 station in sBUS one squid was retrieved from a neuston catamaran haul (NCAT) used to sample the surface layer (0–20 cm sampling depth). Dorsal mantle length (DML) of each specimen was measured to the nearest mm below. Visual stomach content analyses of 53 stomachs from chosen epi- and mesopelagic squid species were performed using a stereo-microscope (7.5–50x magnification). Stomach content analyses showed that squid species preyed on a variety of organisms ranging from crustaceans to lanternfishes (Myctophidae) and flying squids (Ommastrephidae)
Multibeam bathymetry raw data (Kongsberg EM 122 entire dataset) of RV SONNE during cruise SO307
No full textRaw multibeam bathymetry data were collected aboard RV SONNE during cruise SO307 Madagaskar/Indico using a 12kHz Kongsberg EM 122 multibeam echosounder with 2x2 beam width. The expedition took place during 2024-09-12 – 2024-10-28 from Durban to Durban (South Africa) in the Indian Ocean. During the SONNE expedition SO307, scientific work was carried out for the geological main project (MADAGASCAR), a biological oceanography sub-project (INDICOM) and a biological sub-project (MADAGASCAR-BIO). The Madagascar Ridge (Southwest Indian Ocean) is ideal to explore the cause(s) of seafloor bathymetric anomalies, because it formed during the breakup of Gondwana, but the process behind its emplacement is controversial. Proposed origins include thinned continental crust, a hotspot-generated aseismic ridge or uplift due to buoyant, melt- depleted mantle. The overall aim of INDICOM is to investigate biological and biogeochemical processes that affect the turnover of organic matter in the deep Indian Ocean. The investigations of MADAGASCAR-Bio aim at: (1) Recording and describing the diversity of selected groups of the benthic communities of the Madagascar Ridge, (2) Uncovering cryptic species, (3) Testing the hypothesis about the function of oceanic ridges and their parallel running currents as corridors for the dispersal of benthic species, (4) Studying the availability of nutrients into the study area by sediment analyses ('total carbon', TC and 'total organic carbon', TOC). Data were recorded outside EEZs. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data and the cruise report for details. The data are unprocessed and can therefore contain incorrect depth measurements (artifacts) if not further processed. Note that refraction errors may occur when no proper SVP is applied. Data acquisition was done by GEOMAR Helmholtz Centre for Ocean Research, provision of the data is supported by the DAM Underway Project and published according to the FAIR principles
Time series measurements from a lab-on-chip nitrate sensor deployed in a glacier-fed fjord (Nuup Kangerlua, Greenland) between June and September 2019
No full textThis is a time-series record of nitrate + nitrite (∑NOx) concentrations measured using an in situ lab-on-chip sensor that was deployed in a glacier-fed fjord (Nuup Kangerlua) between 14th June to 13th September 2019. The sensor (along with a conductivity, temperature and depth (CTD) probe and a silicic acid sensor) was attached to a frame that was anchored to a cliff and submerged at an average depth of 5 m. The sensor was programmed to draw in ambient water (through 0.45 µm pore-size 13 mm diameter polyethersulfone inlet filters) and measure its nitrate + nitrite concentration every 12 hours. Each measurement was accompanied by the measurement of an onboard calibration standard and a blank solution (artificial seawater). During a three-month monitoring period ∑NOx varied between 0.05 and 10.07 µM (± 0.2 μM)
Temperature, salinity and depth measurements from a moored CTD deployed in a glacier-fed fjord (Nuup Kangerlua, Greenland) between June and September 2019
No full textThis is time-series temperature, salinity and depth data from a conductivity, temperature and depth (CTD) probe deployed in a glacier-fed fjord (Nuup Kangerlua) between 14th June and 13th September 2019. The instrument was anchored to a cliff via a wire and submerged at an average depth of 5 m. The instrument was recorded a measurement every 10 minutes. During a three-month monitoring period salinity varied between 14.19 and 30.81, temperature varied between 0.13 and 6.91 °C and depth varied between 2.27 and 7.87 m
Physical oceanography during RV HEINCKE cruise HE643
No full textConductivity-temperature-depth profiles were measured using a Seabird SBE 911plus CTD during RV HEINCKE cruise HE643. The CTD was equipped with duplicate sensors for temperature (SBE3plus), conductivity (SBE4) and oxygen (SBE43). Additional sensors such as a WET Labs C-Star transmissometer, a WET Labs ECO-AFL fluorometer and an altimeter (PSA-916 Teledyne (Benthos)) were mounted to the CTD. Temperature, conductivity and oxygen sensors are calibrated by the manufacturer once a year before being mounted in January. They are used throughout the year and no post-cruise or in-situ calibration is applied. All other sensors are calibrated irregularly. Data were connected to the station book of the specific cruise as available in the DSHIP database. Processing of the data including removal of obvious outliers followed the procedures described in CTD Processing Logbook of RV HEINCKE (hdl:10013/epic.47427). The processing report for this dataset is linked below
Physical oceanography during RV HEINCKE cruise HE642
No full textConductivity-temperature-depth profiles were measured using a Seabird SBE 911plus CTD during RV HEINCKE cruise HE642. The CTD was equipped with duplicate sensors for temperature (SBE3plus), conductivity (SBE4) and oxygen (SBE43). Additional sensors such as a WET Labs C-Star transmissometer, a WET Labs ECO-AFL fluorometer and an altimeter (PSA-916 Teledyne (Benthos)) were mounted to the CTD. Temperature, conductivity and oxygen sensors are calibrated by the manufacturer once a year before being mounted in January. They are used throughout the year and no post-cruise or in-situ calibration is applied. All other sensors are calibrated irregularly. Data were connected to the station book of the specific cruise as available in the DSHIP database. Processing of the data including removal of obvious outliers followed the procedures described in CTD Processing Logbook of RV HEINCKE (hdl:10013/epic.47427). The processing report for this dataset is linked below
Physical oceanography during RV HEINCKE cruise HE648
No full textConductivity-temperature-depth profiles were measured using a Seabird SBE 911plus CTD during RV HEINCKE cruise HE648. The CTD was equipped with duplicate sensors for temperature (SBE3plus), conductivity (SBE4) and oxygen (SBE43). Additional sensors such as a WET Labs C-Star transmissometer, a WET Labs ECO-AFL fluorometer and an altimeter (PSA-916 Teledyne (Benthos)) were mounted to the CTD. Temperature, conductivity and oxygen sensors are calibrated by the manufacturer once a year before being mounted in January. They are used throughout the year and no post-cruise or in-situ calibration is applied. All other sensors are calibrated irregularly. Data were connected to the station book of the specific cruise as available in the DSHIP database. Processing of the data including removal of obvious outliers followed the procedures described in CTD Processing Logbook of RV HEINCKE (hdl:10013/epic.47427). The processing report for this dataset is linked below
Total bacteria and archaea number with different nematodes and substrates conditions
No full textData contain the quantitative polymerase chain reaction (qPCR) numbers of total bacterial and archaeal 16S ribosomal RNA (16S rRNA) genes from 3 different nematode treatments and two different substrates conditions in the natural soil. In first treatment condition there was no addition of nematode, in second treatment bacterivorous nematode (Acrobeloides buetschlii) was added and in third treatment there was the addition of fungivorous nematode (Aphelenchoides saprophilus). Meanwhile, two different substrate conditions were: with and without maize litter. The natural soil for these experiments were collected from Dikopshof agricultural site (50°48′21″ N, 6°59′9″ E), Bonn, Germany. These qPCR numbers were collected in June and July, 2023 to look at the effect of nematode grazing in the bacterial and archaeal populations. The qPCR was performed using primer set of 1389F (5′-TGYACACACCGCCCGT-3′) and 1492R (5′-GGYTACCTTGTTACGACTT-3′) with 20 µl reactions on a qTOWER3G (Analytik-Jena, Jena, Germany)
Seawater carbonate chemistry and growth and physiology of strain CCMP 1334 of the marine cyanobacterium Synechococcus (Cyanophyceae)
No full textThe marine cyanobacterium Synecococcus sp. (CCMP 1334) was grown in a continuous culture system on a 12:12 h light:dark cycle at all combinations of low and high pCO2 (400 and 1000 ppmv, respectively), nutrient availability (nitrate-limited and nutrient-replete conditions), and temperatures of 21, 24, 28, 32, and 35°C.
This dataset is included in the OA-ICC data compilation maintained in the framework of the IAEA Ocean Acidification International Coordination Centre (see https://oa-icc.ipsl.fr). Original data were extracted from tables in the related paper (see Related to) by the OA-ICC data curator. In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2024) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2024-12-23
ANT 2005/06: AWI airborne Radio-Echo Sounding data over the Ekström Isen and Shireas Glacier Basin, Eastern DML (ANTSYO project)
No full textThis dataset contains airborne radar data acquired using the AWI EMR system during the Antarctic season of 2005/06. The profiles extend across the Dronning Maud Land over the Ekström Isen and over the Shireas Glacier Basin. The data are available as netCDF files (including waveforms and metadata), KML files of the profile line locations, and quicklook images of the radargrams