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  • 2020-2024  (26)
  • 2010-2014  (19)
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  • 1
  • 2
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (87 Blatt = 1 MB) , Illustrationen, Diagramme
    Language: Undetermined
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 3
    Publication Date: 2024-03-12
    Description: Zooplankton plays a notable role in ocean biogeochemical cycles. However, it is often simulated as one generic group and top closure term in ocean biogeochemical models. This study presents the description of three zooplankton functional types (zPFTs, micro‐, meso‐ and macrozooplankton) in the ocean biogeochemical model FESOM‐REcoM. In the presented model, microzooplankton is a fast‐growing herbivore group, mesozooplankton is another major consumer of phytoplankton, and macrozooplankton is a slow‐growing group with a low temperature optimum. Meso‐ and macrozooplankton produce fast‐sinking fecal pellets. With three zPFTs, the annual mean zooplankton biomass increases threefold to 210 Tg C. The new food web structure leads to a 25% increase in net primary production and a 10% decrease in export production globally. Consequently, the export ratio decreases from 17% to 12% in the model. The description of three zPFTs reduces model mismatches with observed dissolved inorganic nitrogen and chlorophyll concentrations in the South Pacific and the Arctic Ocean, respectively. Representation of three zPFTs also strongly affects phytoplankton phenology: Fast nutrient recycling by zooplankton sustains higher chlorophyll concentrations in summer and autumn. Additional zooplankton grazing delays the start of the phytoplankton bloom by 3 weeks and controls the magnitude of the bloom peak in the Southern Ocean. As a result, the system switches from a light‐controlled Sverdrup system to a dilution‐controlled Behrenfeld system. Overall, the results suggest that representation of multiple zPFTs is important to capture underlying processes that may shape the response of ecosystems and ecosystem services to on‐going and future environmental change in model projections.
    Description: Plain Language Summary: Zooplankton plays an important role in the ocean food web and biogeochemical cycles. However, it is often represented in very simple forms in mathematical models that are, for example, used to investigate how marine primary productivity will react to climate change. To understand how these models would change when more complicated formulations for zooplankton are used, we present here a new version of the model with three (instead of only one) zooplankton groups. We find that this more complicated representation leads to higher zooplankton biomass, which is closer to observations, and this stimulates growth of phytoplankton since zooplankton also returns nutrients into the system. In addition, zooplankton grazing controls the seasonal cycle of phytoplankton, as we show for one example in the Southern Ocean.
    Description: Key Points: Nutrient recycling by zooplankton stimulates net primary production in the biogeochemical model REcoM‐2. Modeling zooplankton functional types (zPFTs) leads to a switch from a light‐controlled Sverdrup system to a dilution‐controlled Behrenfeld system. Implementing multiple zPFTs improves the modeled zooplankton biomass and zooplankton‐mediated biogeochemical fluxes.
    Description: Helmholtz Young Investigator Group Marine Carbon and Ecosystem Feedbacks in the Earth System [MarESys]
    Description: https://doi.org/10.1594/PANGAEA.779970
    Description: https://doi.org/10.1594/PANGAEA.785501
    Description: https://doi.org/10.1594/PANGAEA.777398
    Description: https://www.nodc.noaa.gov/OC5/woa18/woa18data.html
    Description: http://sites.science.oregonstate.edu/ocean.productivity/index.php
    Description: https://doi.pangaea.de/10.1594/PANGAEA.942192
    Keywords: ddc:577.7 ; Southern Ocean ; zooplankton ; ocean food web ; biogeochemical cycles ; modeling
    Language: English
    Type: doc-type:article
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  • 4
    Publication Date: 2023-01-13
    Keywords: Abundance per volume; ANT-I/2; Date/Time of event; Depth, bottom/max; Depth, top/min; DEPTH, water; Event label; Latitude of event; Longitude of event; MULT; Multiple investigations; Polarstern; PS01; PS01/131; PS01/132; PS01/152; PS01/153; PS01/156; PS01/161; PS01/169; PS01/170; PS01/171; PS01/172; PS01/173; PS01/190; PS01/192; PS01/193; PS01/195; PS01/196; PS01/199; PS01/200; PS01/201; PS01/203; PS01/209; PS01/211; PS01/212; PS01/215; PS01/218; PS01/221; PS01/222; PS01/226; PS01/229; PS01/230; PS01/232; PS01/233; Taxon/taxa; Type; Uniform resource locator/link to reference; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 579 data points
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  • 5
    Publication Date: 2023-01-30
    Description: Copepod samples were taken during the Antarctic expedition PS 79 (ANT XXVIII/2) with RV Polarstern (Cape Town – Cape Town, 3 Dec 2011 – 5 Jan 2012). Copepods were collected at Station 53 (60° 3.22'S, 0° 2.14' E) in the Antarctic Weddell Gyre on 28 December 2011 by vertical bongo net hauls down to 300 m depth. Specimens of C. acutus (210 copepodids CV and 160 females) and of C. propinquus (125 females, no CV stages available) were gently sorted from the catch, maintained alive in filtered seawater at 0°C in a cooling container on board and transported to Germany at 0°C by airplane. Feeding carbon-labelled diatoms to these copepods during 9 days of feeding ,13C elucidated assimilation and turnover rates of copepod total lipids as well as specific fatty acids and alcohols. The 13C incorporation into these compounds was monitored by compound-specific stable isotope analysis (CSIA). The differences in lipid assimilation and turnover clearly show that the copepod species exhibit a high variability and plasticity to adapt their lipid production to their various life phases.
    Keywords: Antarctic; ANT-XXVIII/2; BONGO; Bongo net; carbon turnover; CSIA; lipids; Polarstern; PS79; PS79/053-5; South Atlantic Ocean; Zooplankton
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 5.4 MBytes
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  • 6
    Publication Date: 2023-08-23
    Keywords: 6,9,12-Hexadecatrienoic acid of total fatty acids; 9,12-Hexadecadienoic acid of total fatty acids; 9-Tetradecenoic acid of total fatty acids; 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-6,9,12,15-Octadecatetraenoic acid of total fatty acids; all-cis-7,10,13,16,19-Docosapentaenoic acid of total fatty acids; all-cis-9,12,15-Octadecatrienoic acid of total fatty acids; all-cis-9,12-Octadecadienoic acid of total fatty acids; Carbon, organic, total; Carbon, organic, total, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; cis-11-Icosenoic acid of total fatty acids; cis-11-Octadecenoic acid of total fatty acids (IUPAC: Octadec-11-enoic acid); cis-13-Octadecenoic acid of total fatty acids; cis-7-Hexadecenoic acid of total fatty acids; cis-9-Hexadecenoic acid of total fatty acids (IUPAC: (9Z)-hexadec-9-enoic acid); cis-9-Octadecenoic acid of total fatty acids (IUPAC: Octadec-9-enoic acid); Fatty acids, standard deviation; Hexadecanoic acid of total fatty acids; Monounsaturated fatty acids of total fatty acids; Nitrogen, organic; Nitrogen, organic, standard deviation; Octadecanoic acid of total fatty acids; Octadecatetraenoic acid 18:4(n-4) of total fatty acids; Pentadecanoic acid of total fatty acids; Polyunsaturated fatty acids of total fatty acids; Sample type; Saturated fatty acids of total fatty acids; Tetradecanoic acid of total fatty acids
    Type: Dataset
    Format: text/tab-separated-values, 189 data points
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  • 7
    Publication Date: 2023-08-23
    Keywords: 6,9,12,15-Hexadecatetraenoic acid of total fatty acids; 6,9,12-Hexadecatrienoic acid of total fatty acids; 9,12-Hexadecadienoic acid of total fatty acids; 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-6,9,12,15-Octadecatetraenoic acid of total fatty acids; all-cis-9,12,15-Octadecatrienoic acid of total fatty acids; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbon content per individual; cis-11-Icosenoic acid of total fatty acids; cis-11-Octadecenoic acid of total fatty acids (IUPAC: Octadec-11-enoic acid); cis-15-Tetracosenoic acid of total fatty acids; cis-9-Hexadecenoic acid of total fatty acids (IUPAC: (9Z)-hexadec-9-enoic acid); cis-9-Octadecenoic acid of total fatty acids (IUPAC: Octadec-9-enoic acid); Dry mass, standard deviation; Dry mass per individual; Experiment day; Fatty acids, standard deviation; Hexadecanoic acid of total fatty acids; Lipids, standard deviation; Lipids per individual; Monounsaturated fatty acids of total fatty acids; Nitrogen content per individual; Octadecanoic acid of total fatty acids; Octadecatetraenoic acid 18:4(n-4) of total fatty acids; Polyunsaturated fatty acids of total fatty acids; Saturated fatty acids of total fatty acids; Sex; Species; Standard deviation; Tetradecanoic acid of total fatty acids; Treatment: food
    Type: Dataset
    Format: text/tab-separated-values, 225 data points
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  • 8
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    Unknown
    PANGAEA
    In:  Supplement to: Kreibich, Tobias; Saborowski, Reinhard; Hagen, Wilhelm; Niehoff, Barbara (2011): Influence of short-term nutritional variations on digestive enzyme and fatty acid patterns of the calanoid copepod Temora longicornis. Journal of Experimental Marine Biology and Ecology, 407(2), 182-189, https://doi.org/10.1016/j.jembe.2011.06.013
    Publication Date: 2023-10-28
    Description: Temora longicornis, a dominant calanoid copepod species in the North Sea, is characterised by low lipid reserves and high biomass turnover rates. To survive and reproduce successfully, this species needs continuous food supply and thus requires a highly flexible digestive system to exploit various food sources. Information on the capacity of digestive enzymes is scarce and therefore the aim of our study was to investigate the enzymatic capability to respond to quickly changing nutritional conditions. We conducted two feeding experiments with female T. longicornis from the southern North Sea off Helgoland. In the first experiment in 2005, we tested how digestive enzyme activities and enzyme patterns as revealed by substrate SDS-PAGE (sodium dodecylsulfate polyacrylamide gel electrophoresis) responded to changes in food composition. Females were incubated for three days fed ad libitum with either the heterotrophic dinoflagellate Oxyrrhis marina or the diatom Thalassiosira weissflogii. At the beginning and at the end of the experiment, copepods were deep-frozen for analyses. The lipolytic enzyme activity did not change over the course of the experiment but the enzyme patterns did, indicating a distinct diet-induced response. In a second experiment in 2008, we therefore focused on the enzyme patterns, testing how fast changes occur and whether feeding on the same algal species leads to similar patterns. In this experiment, we kept the females for 4 days at surplus food while changing the algal food species daily. At day 1, copepods were offered O. marina. On day 2, females received the cryptophycean Rhodomonas baltica followed by T. weissflogii on day 3. On day 4 copepods were again fed with O. marina. Each day, copepods were frozen for analysis by means of substrate SDS-PAGE. This showed that within 24 h new digestive enzymes appeared on the electrophoresis gels while others disappeared with the introduction of a new food species, and that the patterns were similar on day 1 and 4, when females were fed with O. marina. In addition, we monitored the fatty acid compositions of the copepods, and this indicated that specific algal fatty acids were quickly incorporated. With such short time lags between substrate availability and enzyme response, T. longicornis can successfully exploit short-term food sources and is thus well adapted to changes in food availability, as they often occur in its natural environment due seasonal variations in phyto- and microzooplankton distribution.
    Keywords: AWI; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 9
    Publication Date: 2024-02-02
    Keywords: Comment; Date/Time of event; Depth, bottom/max; Depth, top/min; DEPTH, water; Dry mass per individual; Elevation of event; Event label; experiment; Experiment; Individual respiration rate; Latitude of event; Life stage; Longitude of event; M153; M153_11-4; M153_12-4; M153_13-4; M153_14-4; M153_17-5; M153_18-15; M153_18-18; M153_18-5; M153_18-7; M153_24-6; M153_25-6; M153_31-3; M153_33-3; M153_34-6; M153_35-14; M153_35-6; M153_37-5; M153_38-5; M153_39-23; M153_40-6; M153_40-7; M153_43-4; M153_44-4; M153_45-4; M153_49-2; M153_7-16; M153_7-5; M153_8-4; M153_9-3; Meteor (1986); MSN; Multiple opening/closing net; Respiration rate, oxygen, per dry mass; Sample ID; Species; Station label; Temperature, water; TRAFFIC; Trophic Transfer Efficiency in the Benguela Current
    Type: Dataset
    Format: text/tab-separated-values, 1690 data points
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  • 10
    Publication Date: 2024-02-02
    Keywords: Acartia, c1-c3, ingestion rate of carbon; Acartia, c4-c5, ingestion rate of carbon; Acartia, female, ingestion rate of carbon; Acartia, male, ingestion rate of carbon; Aetideidae, c1-c3, ingestion rate of carbon; Aetideidae, c4-c5, ingestion rate of carbon; Aetideopsis, c4-c5, ingestion rate of carbon; Aetideus, c4-c5, ingestion rate of carbon; Aetideus, male, ingestion rate of carbon; Aetideus armatus, female, ingestion rate of carbon; Aetideus giesbrechti, female, ingestion rate of carbon; Amallothrix, female, ingestion rate of carbon; Augaptilidae, c1-c3, ingestion rate of carbon; Calanidae, c1-c3, ingestion rate of carbon; Calanoida, biomass as dry weight; Calanoida, ingestion rate of carbon; Calanoida, total; Calanoides natalis, c4-c5, ingestion rate of carbon; Calanoides natalis, female, ingestion rate of carbon; Calanoides natalis, male, ingestion rate of carbon; Calanus agulhensis, c4-c5, ingestion rate of carbon; Calanus agulhensis, female, ingestion rate of carbon; Calanus agulhensis, male, ingestion rate of carbon; Calculated; Candacia, c1-c3, ingestion rate of carbon; Candacia, c4c5, ingestion rate of carbon; Candacia bipinnata, female , ingestion rate of carbon; Candacia curta, female, ingestion rate of carbon; Candacia curta, male, ingestion rate of carbon; Candacia sp., female, ingestion rate of carbon; Centropages brachiatus, c1-c3, ingestion rate of carbon; Centropages brachiatus, c4-c5, ingestion rate of carbon; Centropages brachiatus, female, ingestion rate of carbon; Centropages brachiatus, male, ingestion rate of carbon; Centropages bradyi, c1-c3, ingestion rate of carbon; Centropages bradyi, c4-c5, ingestion rate of carbon; Chiridius gracilis, c4-c5, ingestion rate of carbon; Chiridius gracilis, female, ingestion rate of carbon; Clausocalanidae, ingestion rate of carbon; Comment; Cyclopoida, biomass as dry weight; Cyclopoida, ingestion rate of carbon; Cyclopoida, total; Date/Time of event; Depth, bottom/max; Depth, top/min; DEPTH, water; Elevation of event; Euaugaptilus palumboi, c4-c5, ingestion rate of carbon; Euaugaptilus palumboi, female, ingestion rate of carbon; Eucalanus hyalinus, female, ingestion rate of carbon; Eucalanus hyalinus, male, ingestion rate of carbon; Euchaeta, c1-c3, ingestion rate of carbon; Euchaeta, c4-c5, ingestion rate of carbon; Euchaeta acuta, female, ingestion rate of carbon; Euchaeta acuta, male, ingestion rate of carbon; Euchaeta marina, female, ingestion rate of carbon; Euchaeta media, female, ingestion rate of carbon; Euchaeta sp., male, ingestion rate of carbon; Euchirella rostrata, c4-c5, ingestion rate of carbon; Euchirella sp., c1-c3, ingestion rate of carbon; Euchirella sp., c4-c5, ingestion rate of carbon; Event label; Gaetanus brevispinus, male, ingestion rate of carbon; Gaetanus cf. minor, c1-c3, ingestion rate of carbon; Gaetanus cf. minor, c4-c5, ingestion rate of carbon; Gaetanus sp., c4-c5, ingestion rate of carbon; Gaetanus spp., c1-c3, ingestion rate of carbon; Haloptilus longicornis, c1-c3, ingestion rate of carbon; Haloptilus longicornis, c4-c5, ingestion rate of carbon; Haloptilus longicornis, female, ingestion rate of carbon; Haloptilus oxycephalus, female, ingestion rate of carbon; Heterorhabdus spp., c1-c3, ingestion rate of carbon; Heterorhabdus spp., c4-c5, ingestion rate of carbon; Heterorhabdus spp., female, ingestion rate of carbon; Heterorhabdus spp., male, ingestion rate of carbon; Labidocera acuta, female, ingestion rate of carbon; Latitude of event; Longitude of event; Lophothrix frontalis, c4-c5, ingestion rate of carbon; Lophothrix latipes, female, ingestion rate of carbon; Lucicutia, maleagna, female, ingestion rate of carbon; Lucicutia clausii, c4-c5, ingestion rate of carbon; Lucicutia clausii, female, ingestion rate of carbon; Lucicutia clausii, male, ingestion rate of carbon; Lucicutia gaussae, female, ingestion rate of carbon; Lucicutia ovalis, male, ingestion rate of carbon; Lucicutia spp., c1-c3, ingestion rate of carbon; Lucicutia spp., c4-c5, ingestion rate of carbon; Lucicutia spp., female, ingestion rate of carbon; Lucicutia spp., male, ingestion rate of carbon; M153; M153_11-4; M153_12-4; M153_18-15; M153_6-4; M153_7-5; M153_8-4; M153_9-3; Mesocalanus tenuicornis, c1-c3, ingestion rate of carbon; Mesocalanus tenuicornis, c4-c5, ingestion rate of carbon; Mesocalanus tenuicornis, female, ingestion rate of carbon; Mesocalanus tenuicornis, male, ingestion rate of carbon; Meteor (1986); Metridia brevicauda, c4-c5, ingestion rate of carbon; Metridia brevicauda, female, ingestion rate of carbon; Metridia brevicauda, male, ingestion rate of carbon; Metridia effusa, c4-c5, ingestion rate of carbon; Metridia effusa, female, ingestion rate of carbon; Metridia effusa, male, ingestion rate of carbon; Metridia lucens, c4-c5, ingestion rate of carbon; Metridia lucens, female, ingestion rate of carbon; Metridia lucens, male, ingestion rate of carbon; Metridia venusta, c4-c5, ingestion rate of carbon; Metridia venusta, female, ingestion rate of carbon; Metridia venusta, male, ingestion rate of carbon; Metridinidae, c1-c3, ingestion rate of carbon; Monacilla sp., male, ingestion rate of carbon; MSN; Multiple opening/closing net; Nannocalanus, minor, c4-c5, ingestion rate of carbon; Nannocalanus, minor, female, ingestion rate of carbon; Nannocalanus, minor, male, ingestion rate of carbon; Neocalanus gracilis, c1-c3, ingestion rate of carbon; Neocalanus gracilis, c4-c5, ingestion rate of carbon; Neocalanus gracilis, female, ingestion rate of carbon; Neocalanus gracilis, male, ingestion rate of carbon; Nullosetigera helgae, female, ingestion rate of carbon; Nullosetigera impar, female, ingestion rate of carbon; Nullosetigera spp., c4-c5, ingestion rate of carbon; Oithona, ingestion rate of carbon; Oncaeidae, ingestion rate of carbon; Pareucalanus sp., c1-c3, ingestion rate of carbon; Pareucalanus sp., c4-c5, ingestion rate of carbon; Pleuromamma abdominalis, c1-c3, ingestion rate of carbon; Pleuromamma abdominalis, c4-c5, ingestion rate of carbon; Pleuromamma abdominalis, female, ingestion rate of carbon; Pleuromamma abdominalis, male, ingestion rate of carbon; Pleuromamma quadrungulata, c1-c3, ingestion rate of carbon; Pleuromamma quadrungulata, c4-c5, ingestion rate of carbon; Pleuromamma quadrungulata, female, ingestion rate of carbon; Pleuromamma quadrungulata, male, ingestion rate of carbon; Pleuromamma robusta, c4-c5, ingestion rate of carbon; Pleuromamma robusta, male, ingestion rate of carbon; Pleuromamma spp. small, c4-c5, ingestion rate of carbon; Pleuromamma spp. small, female, ingestion rate of carbon; Pleuromamma spp. small, male, ingestion rate of carbon; Pleuromamma xiphias, c4-c5, ingestion rate of carbon; Pleuromamma xiphias, female, ingestion rate of carbon; Pleuromamma xiphias, male, ingestion rate of carbon; Pseudoamallothrix sp., c4-c5, ingestion rate of carbon; Pseudoamallothrix sp., female, ingestion rate of carbon; Pseudochirella sp., c4-c5, ingestion rate of carbon; Rhincalanus cornutus, c4-c5, ingestion rate of carbon; Rhincalanus cornutus, female, ingestion rate of carbon; Rhincalanus nasutus, c1-c3, ingestion rate of carbon; Rhincalanus nasutus, c4-c5, ingestion rate of carbon; Rhincalanus nasutus, female, ingestion rate of carbon; Rhincalanus nasutus, male, ingestion rate of carbon; Scaphocalanus curtus, female, ingestion rate of carbon; Scaphocalanus spp., c1-c3, ingestion rate of carbon; Scaphocalanus spp., c4-c5, ingestion rate of carbon; Scaphocalanus spp., female, ingestion rate of carbon; Scaphocalanus spp., male, ingestion rate of carbon; Scolecithricella spp., c1-c3, ingestion rate of carbon; Scolecithricella spp., c4-c5, ingestion rate of carbon; Scolecithricella spp., female, ingestion rate of carbon; Scolecithricella spp., male, ingestion rate of carbon; Scolecithrix bradyi, c4-c5, ingestion rate of carbon; Scolecithrix bradyi, female, ingestion rate of carbon; Scolecithrix bradyi, male, ingestion rate of carbon; Scolecithrix
    Type: Dataset
    Format: text/tab-separated-values, 4725 data points
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