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  • Data  (13)
  • 2020-2024  (13)
  • 2022  (13)
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  • 2020-2024  (13)
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  • 1
    Publication Date: 2024-03-09
    Description: Increasing upwelling intensity and shoaling of the oxygen minimum zone (OMZ) is projected for Eastern Boundary Upwelling Systems (EBUSs) under ocean warming which may have severe consequences for mesopelagic food webs, trophic transfer, and fish production also in the Humboldt Current Upwelling System (HUS). To improve our mechanistic understanding, from February 23, 2017 until April 14, 2017 we performed a 50 days mesocosm experiment in the northern HUS (off Callao Bay, Peru) and monitored the zooplankton development prior to and following a simulated upwelling event through the addition of deeper water of two different OMZ-influenced subsurface waters to four of in total eight mesocosms. To elucidate plankton dynamics and trophic relationships, we followed the temporal development of the mesozooplankton community in relation to that of phytoplankton, analyzed the fatty acid composition and gut fluorescence of dominant copepods, and determined the stable isotope (SI) and elemental composition (C:N) of dominant zooplankton taxa. Zooplankton samples were collected from the mesocosms over the entire experiment duration using an Apstein net (17 cm diameter, 100 µm mesh) to determine abundance and taxonomic composition of the zooplankton community, and to analyze fatty acid composition, gut fluorescence and elemental composition of dominant zooplankton. Furthermore, abundance and biomass of zooplankton groups was estimated from scanned ZooScan images.
    Keywords: Abundance; Biomass; Climate - Biogeochemistry Interactions in the Tropical Ocean; Coastal Upwelling System in a Changing Ocean; CUSCO; Gut fluorescence; Humboldt Current System; KOSMOS_2017; KOSMOS_2017_Peru; KOSMOS Peru; Lipid; MESO; mesocosm experiment; Mesocosm experiment; Oxygen Minimun zone; SFB754; Stable isotopes; Zooplankton
    Type: Dataset
    Format: application/zip, 5 datasets
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2024-03-09
    Description: A combined stable isotope and fatty acid trophic biomarker approach was adopted for key zooplankton taxa and higher trophic positions of the northern Humboldt Current System to elucidate the pelagic food-web structure and to better understand trophic interactions. Samples covered an extensive spatial range from 8.5°S to 16°S and a vertical range down to 1,000 m depth. Immediately after each haul, specimens were sorted alive in the lab and apparently live and healthy individuals were stored in vials and deep-frozen at -80°C until further lipid and stable isotope analyses. The comprehensive data set covered over 20 zooplankton taxa and indicated that three biomass-rich crustacean species usually dominated the zooplankton community, i.e., the copepods Calanus chilensis at the surface and Eucalanus inermis in the pronounced oxygen minimum zone and the krill Euphausia mucronata, resulting in an overall low number of major trophic pathways toward anchovies. In addition, the semi-pelagic squat lobster Pleuroncodes monodon appears to play a key role in the benthic-pelagic coupling. By partly feeding on benthic resources and by diel vertical migration, P. monodon provides a unique pathway for returning carbon and energy from the sea floor to the epipelagic layer, increasing the food supply for pelagic fish.
    Keywords: Coastal Upwelling System in a Changing Ocean; CUSCO
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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  • 3
    Publication Date: 2024-03-09
    Description: Abundance and community structure of calanoid copepods of one day (stn. 16; bottom depth 5,433 m) and one night station (stn. 15; bottom depth 5,462 m) were analyzed (Fig. 1). Stratified vertical hauls were carried out within 24 h with a HydroBios Multinet Maxi (0.5 m2 net opening, 9 nets, 150 µm mesh size) from 800 m depth to the surface (strata: 800-700-600-500-400-300-200-100-50-0 m). The filtered water volume was measured with a flowmeter attached to the net opening. After retrieval, samples were preserved in a 4% borax-buffered formaldehyde in seawater solution. Calanoid copepods were sorted according to their developmental stages (copepodids C1-3 and C4/5, adult females and males), counted and identified to genus or, if possible, to species level under a dissecting microscope (Leica MZ12). Rare species (〈100 individuals per sample) were counted from the entire sample. Total length (TL) of up to 100 calanoid individuals per taxonomic category (i.e. family/genus/species) and stage was measured (~6,600 specimens in total). Dry mass (DM) of calanoids was calculated based on the median TL of each taxonomic category. Individual respiration rates were calculated from individual DM and in situ temperatures, which were then converted to carbon units and used to calculate ingestion and egestion rates.
    Keywords: calanoid copepods; South Atlantic Ocean; subtropical area; Zooplankton
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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  • 4
    Publication Date: 2024-03-09
    Description: This dataset shows abundance of zooplankton taxa in individuals per liter as determined by ZooScan. Each data point is one sampling day (date) in one mesocosm (MK). For details on experimental treatments and sampling, refer to Bach et al. 2021 (https://doi.org/10.5194/bg-17-4831-2020) and Ayon et al. 2022 (https://doi.org/10.5194/bg-2022-157). Raw images are stored in https://ecotaxa.obs-vlfr.fr/prj/3784. All taxonomic categories are self-explanatory.
    Keywords: Abundance; Acartia spp.; Biomass; Bivalvia; Branchiostoma spp.; Calanoida; Ceratium spp.; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cnidaria; Coastal Upwelling System in a Changing Ocean; Copepoda; Copepoda, nauplii; Corycaeidae; Crustacea, larvae; CUSCO; Cyclopoida; DATE/TIME; Diatoms, centrales; Gastropoda; Gut fluorescence; Harpacticoida; Hemicyclops spp.; Humboldt Current System; KOSMOS_2017; KOSMOS_2017_Peru; KOSMOS Peru; Lipid; MESO; mesocosm experiment; Mesocosm experiment; Mesocosm label; Noctilucales; Oncaeidae; Oxygen Minimun zone; Paracalanus spp.; Polychaeta; Sample code/label; Sample volume; SFB754; Spionidae; Stable isotopes; Tintinnida; Zooplankton; ZOOSCAN
    Type: Dataset
    Format: text/tab-separated-values, 2430 data points
    Location Call Number Limitation Availability
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  • 5
    Publication Date: 2024-03-09
    Description: Zooplankton metabolic processes play an important role in carbon budgets and fluxes of pelagic ecosystems. Respiration rates of several copepod species were determined to reveal their energy requirements and assess their significance in the carbon cycle. Respiration rates were measured by optode respirometry and allometrically based on body dry mass (DM). For the on-board measurements, a 10-channel optode respirometer (PreSens Precision Sensing Oxy-10 Mini) was used and experiments were run in gas-tight glass bottles (13-14 ml) filled with filtered seawater to reduce bias by microbial respiration. In addition, respiration rates for all dominant copepod species during MSM80 including copepodite stages C4 to C6 were determined based on individual DM and respective ambient temperatures after Bode et al. (2018). For that, individual DM, if not available from frozen specimens, was determined from formalin/Steedman-preserved samples by weighing the dried samples on a microbalance. Losses in body DM due to formalin/Steedman preservation were considered after Schukat et al. (2021). Respiration rates were calculated separately for the copepod family Eucalanidae (a) as they are rather sluggish while all other copepods exhibited normal activity (b). (a) lnRTF = -2.180 + 0.787 ln(DM) + 0.131T and (b) lnRAC = -0.890 + 0.646 ln(DM) + 0.094T, where R (μl O2 ind-1 h-1) is the individual respiration rate for eucalanid (RTF) and active (RAC) copepods, DM represents dry mass in mg and T the average temperature (°C) of the sampling interval. Respiration rates of the medium- to larger-sized copepods (female prosome length (PL) of 1.2-6.0 mm) were compared to those of "small copepods" (all copepods with female PL 〈1.1 mm and young stages). Medium- to larger-sized species ingested on average 13-212 mg C m-2 d-1 in coastal regions while "small copepods" on average consumed 118-328 mg C m-2 d-1. The potential egestion varied on average from 5-64 mg C m-2 d-1 for medium to larger-sized copepods and 35-98 mg C m-2 d-1 for "small copepods". Data of energy demands, consumption and egestion rates of copepod species differing in size are essential to improve carbon budgets and food-web models in the Humboldt Current System.
    Keywords: Analytical method; calanoid copepods; carbon budgets; Coastal Upwelling System in a Changing Ocean; consumption rates; Copepoda, mass; CUSCO; CUSCO-1; Date/Time of event; Depth, bottom/max; Depth, top/min; Egestion rate of carbon per day per individual; Event label; Ingestion rate of carbon per day per individual; Latitude of event; Life stage; Longitude of event; Maria S. Merian; MSM80; MSM80_102-4; MSM80_10-4; MSM80_104-6; MSM80_13-4; MSM80_14-4; MSM80_15-5; MSM80_1-6; MSM80_16-4; MSM80_18-4; MSM80_20-4; MSM80_22-4; MSM80_25-4; MSM80_28-4; MSM80_30-4; MSM80_38-5; MSM80_40-5; MSM80_43-5; MSM80_45-5; MSM80_4-6; MSM80_46-6; MSM80_53-4; MSM80_56-5; MSM80_58-4; MSM80_60-4; MSM80_66-4; MSM80_67-4; MSM80_68-5; MSM80_70-3; MSM80_7-4; MSM80_74-4; MSM80_78-4; MSM80_80-6; MSM80_89-4; MSM80_90-4; MSM80_94-5; MSM80_95-4; MSM80_96-4; MSM80_99-6; MSN; Multiple opening/closing net; Respiration rate, carbon, per individual; Respiration rate, oxygen, per dry mass; Respiration rate, oxygen, per individual; Sample ID; Species; Station label; Temperature, technical; Upwelling
    Type: Dataset
    Format: text/tab-separated-values, 10108 data points
    Location Call Number Limitation Availability
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  • 6
    Publication Date: 2024-03-09
    Keywords: ANT-XXIX/1; calanoid copepods; Life stage; MSN; Multiple opening/closing net; Number of specimens; Polarstern; Prosome, length; Prosome length, standard deviation; PS81; PS81/015-2; PS81/016-4; South Atlantic Ocean; Species; subtropical area; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 1071 data points
    Location Call Number Limitation Availability
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  • 7
    Publication Date: 2024-03-09
    Keywords: Acartia spp., c1-c3; Acartia spp., c4-c5; Acartia spp., female; Acartia spp., male; Aetidaeidae, c1-c3; Aetidaeidae, c4-c5; Aetidaeidae, female; Aetidaeidae, male; Aetidaeus arcuatus, c1-c3; Aetidaeus arcuatus, c4-c5; Aetidaeus arcuatus, female; Aetidaeus arcuatus, male; Aetidaeus armatus, c1-c3; Aetidaeus armatus, c4-c5; Aetidaeus armatus, female; Aetidaeus armatus, male; Aetidaeus australis, c1-c3; Aetidaeus australis, c4-c5; Aetidaeus australis, female; Aetidaeus australis, male; Aetidaeus giesbrechti, c1-c3; Aetidaeus giesbrechti, c4-c5; Aetidaeus giesbrechti, female; Aetidaeus giesbrechti, male; Aetidaeus spp., c1-c3; Aetidaeus spp., c4-c5; Aetidaeus spp., female; Aetidaeus spp., male; Aetideopsis carinata, c1-c3; Aetideopsis carinata, c4-c5; Aetideopsis carinata, female; Aetideopsis carinata, male; Aetideopsis spp., c1-c3; Aetideopsis spp., c4-c5; Aetideopsis spp., female; Aetideopsis spp., male; Amallothrix spp., c1-c3; Amallothrix spp., c4-c5; Amallothrix spp., female; Amallothrix spp., male; ANT-XXIX/1; Augaptilidae, c1-c3; Augaptilidae, c4-c5; Augaptilidae, female; Augaptilidae, male; Augaptilus anceps, c1-c3; Augaptilus anceps, c4-c5; Augaptilus anceps, female; Augaptilus anceps, male; Augaptilus longicaudatus, c1-c3; Augaptilus longicaudatus, c4-c5; Augaptilus longicaudatus, female; Augaptilus longicaudatus, male; Augaptilus megalurus, c1-c3; Augaptilus megalurus, c4-c5; Augaptilus megalurus, female; Augaptilus megalurus, male; Augaptilus spinifrons, c1-c3; Augaptilus spinifrons, c4-c5; Augaptilus spinifrons, female; Augaptilus spinifrons, male; Augaptilus spp., c1-c3; Augaptilus spp., c4-c5; Augaptilus spp., female; Augaptilus spp., male; Calanidae, c1-c3; Calanidae, c4-c5; Calanidae, female; Calanidae, male; Calanoides natalis, c1-c3; Calanoides natalis, c4-c5; Calanoides natalis, female; Calanoides natalis, male; Calocalanus spp., c1-c3; Calocalanus spp., c4-c5; Calocalanus spp., female; Calocalanus spp., male; Candacia bipinnata, c1-c3; Candacia bipinnata, c4-c5; Candacia bipinnata, female; Candacia bipinnata, male; Candacia curta, c1-c3; Candacia curta, c4-c5; Candacia curta, female; Candacia curta, male; Candacia elongata, c1-c3; Candacia elongata, c4-c5; Candacia elongata, female; Candacia elongata, male; Candacia ethiopica, c1-c3; Candacia ethiopica, c4-c5; Candacia ethiopica, female; Candacia ethiopica, male; Candacia longimana, c1-c3; Candacia longimana, c4-c5; Candacia longimana, female; Candacia longimana, male; Candacia spp., c1-c3; Candacia spp., c4-c5; Candacia spp., female; Candacia spp., male; Centropages bradyi, c1-c3; Centropages bradyi, c4-c5; Centropages bradyi, female; Centropages bradyi, male; Cephalophanes spp., c1-c3; Cephalophanes spp., c4-c5; Cephalophanes spp., female; Cephalophanes spp., male; Clausocalanus spp., c1-c3; Clausocalanus spp., c4-c5; Clausocalanus spp., female; Clausocalanus spp., male; Comment; Copepoda; Ctenocalanus spp., c1-c3; Ctenocalanus spp., c4-c5; Ctenocalanus spp., female; Ctenocalanus spp., male; Delibus spp., c1-c3; Delibus spp., c4-c5; Delibus spp., female; Delibus spp., male; Depth, bottom/max; Depth, top/min; DEPTH, water; Disco spp., c1-c3; Disco spp., c4-c5; Disco spp., female; Disco spp., male; Euaugaptilus spp., c1-c3; Euaugaptilus spp., c4-c5; Euaugaptilus spp., female; Euaugaptilus spp., male; Eucalanus hyalinus, c1-c3; Eucalanus hyalinus, c4-c5; Eucalanus hyalinus, female; Eucalanus hyalinus, male; Euchaeta marina, c1-c3; Euchaeta marina, c4-c5; Euchaeta marina, female; Euchaeta marina, male; Euchaeta spp., c1-c3; Euchaeta spp., c4-c5; Euchaeta spp., female; Euchaeta spp., male; Euchaetidae, c1-c3; Euchaetidae, c4-c5; Euchaetidae, female; Euchaetidae, male; Euchirella pulchra, c1-c3; Euchirella pulchra, c4-c5; Euchirella pulchra, female; Euchirella pulchra, male; Euchirella splendes, c1-c3; Euchirella splendes, c4-c5; Euchirella splendes, female; Euchirella splendes, male; Euchirella spp., c1-c3; Euchirella spp., c4-c5; Euchirella spp., female; Euchirella spp., male; Event label; Farrania frigida, c1-c3; Farrania frigida, c4-c5; Farrania frigida, female; Farrania frigida, male; Gaetanus brevicornis, c1-c3; Gaetanus brevicornis, c4-c5; Gaetanus brevicornis, female; Gaetanus brevicornis, male; Gaetanus cf. pileatus, c1-c3; Gaetanus cf. pileatus, c4-c5; Gaetanus cf. pileatus, female; Gaetanus cf. pileatus, male; Gaetanus kruppii, c1-c3; Gaetanus kruppii, c4-c5; Gaetanus kruppii, female; Gaetanus kruppii, male; Gaetanus spp., c1-c3; Gaetanus spp., c4-c5; Gaetanus spp., female; Gaetanus spp., male; Haloptilus cf. longicirrus, c1-c3; Haloptilus cf. longicirrus, c4-c5; Haloptilus cf. longicirrus, female; Haloptilus cf. longicirrus, male; Haloptilus cf. oxycephalus, c1-c3; Haloptilus cf. oxycephalus, c4-c5; Haloptilus cf. oxycephalus, female; Haloptilus cf. oxycephalus, male; Haloptilus spp., c1-c3; Haloptilus spp., c4-c5; Haloptilus spp., female; Haloptilus spp., male; Heterorhabdidae, c1-c3; Heterorhabdidae, c4-c5; Heterorhabdidae, female; Heterorhabdidae, male; Heterorhabdus cf. lobatus, c1-c3; Heterorhabdus cf. lobatus, c4-c5; Heterorhabdus cf. lobatus, female; Heterorhabdus cf. lobatus, male; Heterorhabdus spp., c1-c3; Heterorhabdus spp., c4-c5; Heterorhabdus spp., female; Heterorhabdus spp., male; Lophothrix humilifrons, c1-c3; Lophothrix humilifrons, c4-c5; Lophothrix humilifrons, female; Lophothrix humilifrons, male; Lophothrix spp., c1-c3; Lophothrix spp., c4-c5; Lophothrix spp., female; Lophothrix spp., male; Lucicutia gaussae, c1-c3; Lucicutia gaussae, c4-c5; Lucicutia gaussae, female; Lucicutia gaussae, male; Lucicutia longicornis, c1-c3; Lucicutia longicornis, c4-c5; Lucicutia longicornis, female; Lucicutia longicornis, male; Lucicutia ovalis, c1-c3; Lucicutia ovalis, c4-c5; Lucicutia ovalis, female; Lucicutia ovalis, male; Lucicutia spp., c1-c3; Lucicutia spp., c4-c5; Lucicutia spp., female; Lucicutia spp., male; Mecynocera clausi, c1-c3; Mecynocera clausi, c4-c5; Mecynocera clausi, female; Mecynocera clausi, male; Megacalanus princeps, c1-c3; Megacalanus princeps, c4-c5; Megacalanus princeps, female; Megacalanus princeps, male; Mesocalanus tenuicornis, c1-c3; Mesocalanus tenuicornis, c4-c5; Mesocalanus tenuicornis, female; Mesocalanus tenuicornis, male; Metridia brevicauda, c1-c3; Metridia brevicauda, c4-c5; Metridia brevicauda, female; Metridia brevicauda, male; Metridia discreta, c1-c3; Metridia discreta, c4-c5; Metridia discreta, female; Metridia discreta, male; Metridia effusa, c1-c3; Metridia effusa, c4-c5; Metridia effusa, female; Metridia effusa, male; Metridia lucens, c1-c3; Metridia lucens, c4-c5; Metridia lucens, female; Metridia lucens, male; Metridia princeps, c1-c3; Metridia princeps, c4-c5; Metridia princeps, female; Metridia princeps, male; Metridia spp., c1-c3; Metridia spp., c4-c5; Metridia spp., female; Metridia spp., male; Metridia venusta, c1-c3; Metridia venusta, c4-c5; Metridia venusta, female; Metridia venusta, male; Metridinidae, c1-c3; Metridinidae, c4-c5; Metridinidae, female; Metridinidae, male; Microcalanus spp., c1-c3; Microcalanus spp., c4-c5; Microcalanus spp., female; Microcalanus spp., male; Mimocalanus spp., c1-c3; Mimocalanus spp., c4-c5; Mimocalanus spp., female; Mimocalanus spp., male; Monacilla spp., c1-c3; Monacilla spp., c4-c5; Monacilla spp., female; Monacilla spp., male; Monacilla typica, c1-c3; Monacilla typica, c4-c5; Monacilla typica, female; Monacilla typica, male; MSN; Multiple opening/closing net; Nannocalanus minor, c1-c3; Nannocalanus minor, c4-c5; Nannocalanus minor, female; Nannocalanus minor, male; Neocalanus gracilis, c1-c3; Neocalanus gracilis, c4-c5; Neocalanus gracilis, female; Neocalanus gracilis, male; Neocalanus robustior, c1-c3; Neocalanus robustior, c4-c5; Neocalanus robustior, female; Neocalanus robustior, male; Nullosetigera impar, c1-c3; Nullosetigera impar, c4-c5; Nullosetigera impar, female; Nullosetigera impar, male; Nullosetigera spp., c1-c3; Nullosetigera spp., c4-c5; Nullosetigera spp., female;
    Type: Dataset
    Format: text/tab-separated-values, 9342 data points
    Location Call Number Limitation Availability
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  • 8
    Publication Date: 2024-04-24
    Description: Fatty acids were analyzed by gas chromatography using a DB-FFAP column of 30 m length and 0.25 mm inner diameter and a programmable temperature vaporizer injector. Following the trophic biomarker concept, the fatty acids 16:0, 20:5(n-3) and 22:6(n-3) were classified as typical components of biomembranes. High levels of 16:1(n−7) as well as 16:4(n−1) and 18:1(n−7) were used as diatom markers and 18:4(n−3) as fatty acid marker for dinoflagellates. The fatty acid 18:1(n-9) indicates carnivorous feeding. A carnivory index was applied based on the fatty acid ratio 18:1(n−9) / [16:1(n−7) + 16:4(n−1) + 18:1(n−7) + 18:4(n−3) + 18:1(n−9)] to reflect the proportion of carnivorous compared to herbivorous feeding in an organism. Fatty acid compositions of zooplankton and fish were taxon-specific and did not depend on sampling area or depth. Most species showed a dominance of typical membrane fatty acids, e.g., 16:0, 20:5(n-3) and 22:6(n-3). The dominant copepod Calanus chilensis had a low carnivory index and elevated amounts of diatom fatty acid markers which point to a predominantly herbivorous feeding. Among the krill species, Euphausia mucronata had the lowest carnivory index compared to the other euphausiids indicating a more herbivorous feeding. The squat lobster Pleuroncodes monodon had a significantly lower carnivory ratio compared to the deep-sea decapods Gennadas sp. and Acanthephyra sp. emphasizing its different trophic role compared to other decapods.
    Keywords: 6,9,12,15-Hexadecatetraenoic acid of total fatty acids; ACS; all-cis-4,7,10,13,16,19-Docosahexaenoic acid of total fatty acids; all-cis-5,8,11,14,17-Eicosapentaenoic acid of total fatty acids; all-cis-5,8,11,14-Eicosatetraenoic acid of total fatty acids; all-cis-8,11,14-Octadecatrienoic acid of total fatty acids; all-cis-9,12-Octadecadienoic acid of total fatty acids; cis-11-Docosenoic acid of total fatty acids; cis-11-Icosenoic acid of total fatty acids; cis-11-Octadecenoic acid of total fatty acids (IUPAC: Octadec-11-enoic acid); cis-11-Octadecenol of total fatty alcohols; cis-15-Tetracosenoic acid of total fatty acids; cis-9-Hexadecenoic acid of total fatty acids (IUPAC: (9Z)-hexadec-9-enoic acid); cis-9-Hexadecenol of total fatty alcohols; cis-9-Octadecenoic acid of total fatty acids (IUPAC: Octadec-9-enoic acid); cis-9-Octadecenol of total fatty alcohols; Coastal Upwelling System in a Changing Ocean; CUSCO; CUSCO-1; Date/Time of event; Depth, bottom/max; Depth, top/min; Docosenol of total fatty alcohols; Eicosenol of total fatty alcohols; Event label; Gas chromatography; Hexadecanoic acid of total fatty acids; Hexadecanol of total fatty alcohols; IKMT; Individual dry mass; Isaac-Kid-Midwater Trawl; Latitude of event; Life stage; Lipids; Longitude of event; Maria S. Merian; Microstructure Profiler; MSM80; MSM80_102-4; MSM80_13-4; MSM80_15-5; MSM80_1-6; MSM80_16-4; MSM80_18-4; MSM80_18-7; MSM80_1-9; MSM80_20-4; MSM80_30-4; MSM80_31-4; MSM80_31-7; MSM80_34-4; MSM80_40-5; MSM80_4-6; MSM80_46-15; MSM80_46-20; MSM80_46-23; MSM80_49-6; MSM80_56-5; MSM80_58-4; MSM80_67-4; MSM80_68-5; MSM80_68-6; MSM80_7-4; MSM80_74-4; MSM80_7-8; MSM80_85-3; MSM80_94-5; MSM80_95-4; MSN; MSSP; Multiple opening/closing net; Octadecanoic acid of total fatty acids; Octadecanol of total fatty alcohols; Optical Profiler, ACS; Order; Phytanic acid of total fatty acids; Sample ID; Species; Station label; Tetradecanoic acid of total fatty acids; Tetradecanol of total alcohols; Wax esters
    Type: Dataset
    Format: text/tab-separated-values, 4235 data points
    Location Call Number Limitation Availability
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  • 9
    Publication Date: 2024-05-17
    Description: Small copepod genera play an important role in marine food webs and biogeochemical fluxes but have been neglected in many studies. Abundance, biomass and carbon consumption rates of small- (〈1 mm prosome length (PL)), medium- (1-1.5 mm PL) and large-sized (〉2 mm PL) copepods along a cross-shelf transect in the southern Benguela upwelling system were determined using rather high taxonomic resolution. Zooplankton samples were collected with a Multinet (Hydrobios Multinet midi, 5 nets with 200 µm meshsize) during the Meteor cruise M153 in February/March 2019. Calanoids contributed on average 55 ± 19% to total copepod abundance and 82 ± 13% to total copepod biomass. Small-sized Oithona spp. (119/114 mg C m-2 d-1) and Clauso-/Paracalanidae (87/263 mg C m-2 d-1) as well as large-sized Calanoides natalis (47/193 mg C m-2 d-1) were the dominant consumers at the most inshore stations. Small and medium-sized copepodite stages of Metridia lucens were also important, especially towards the continental slope. At offshore stations, Para-/Clausocalanidae (17-27 mg C m-2 d-1), Oithona spp. (9-16 mg C m-2 d-1), Pleuromamma spp. (0-16 mg C m-2 d-1), Calanus agulhensis (0-15 mg C m-2 d-1), Acartia spp. (0-12 mg C m-2 d-1), C. natalis (0-10 mg C m-2 d-1) and M. lucens (2-6 mg C m-2 d-1) were dominant consumers. Hence, usually small- and medium-sized copepods dominated total copepod ingestion, emphasizing that inadequate representation of small copepods will lead to significant underestimations and misinterpretations of the functioning of zooplankton communities, and finally to inadequate biogeochemical models.
    Keywords: TRAFFIC; Trophic Transfer Efficiency in the Benguela Current
    Type: Dataset
    Format: application/zip, 4 datasets
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    Publication Date: 2024-05-17
    Keywords: Prosome, length; Prosome length, standard deviation; Species; TRAFFIC; Trophic Transfer Efficiency in the Benguela Current
    Type: Dataset
    Format: text/tab-separated-values, 561 data points
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