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  • 2020-2024  (26)
  • 2020-2023  (7)
  • 2010-2014  (19)
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Year
  • 1
    Online Resource
    Online Resource
    Stress response of native and invasive populations of intertidal invertebrates from the North Atlantic : an intraspecific comparison (2011)
    Bremen
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (87 Blatt = 1 MB) , Illustrationen, Diagramme
    URL: https://oceanrep.geomar.de/12090/
    Language: Undetermined
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 2
    Online Resource
    Online Resource
    WTZ Südliches Afrika SPACES II: TRAFFIC – Trophische Transfereffizienz im Benguelastrom : Teilprojekt 3: Pelagische Nahrungsnetzstrukturen, trophische Wechselwirkungen und die Rolle des Zooplanktons für die trophische Transfereffizienz im nördlichen und südlichen Benguela-Auftriebssystem : BMBF-Verbundprojekt TRAFFIC : Sachbericht für die Projektlaufzeit 01.07.2018 bis 31.07.2022 (2022)
    Bremen : Universität Bremen (FB 02)
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (22 Seiten, 2,54 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb23/1876990775.pdf
    URL: https://doi.org/10.2314/KXP:1876990775
    DOI: 10.2314/KXP:1876990775
    Language: German
    Note: Förderkennzeichen BMBF 03F0797B , Verbundnummer 01183047
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  • 3
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    The Role of Zooplankton Grazing and Nutrient Recycling for Global Ocean Biogeochemistry and Phytoplankton Phenology (2022)
    Details
    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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    CITATION GEO-LEO
  • 4
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    Abundance of pteropods in the ice-covered Weddell Sea, Antarctica from 6 February 1983 to 9 March 1983 (2013)
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 5
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    Assimilation rates, compound-specific stable isotope analysis and fatty acid data of dominant Antarctic copepods (2020)
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 6
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    Lipid, carbon and nitrogen content and fatty acid composition of Temora longicornis females and different food species during the experiment (2011)
    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
    Details
    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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    DATA PANGAEA
  • 7
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    Response of zooplankton community succession and trophic links to simulated upwelling conditions during a mesocosm experiment in the coastal upwelling off Callao Bay (Peru) in austral summer 2017 (KOSMOS 2017 Peru mesocosm study) (2022)
    PANGAEA
    Details
    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
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    DATA PANGAEA
  • 8
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    Size measurements of calanoid copepods in the subtropical South Atlantic Ocean during POLARSTERN cruise PS81 (ANT-XXIX/1) (2022)
    PANGAEA
    Details
    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
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    DATA PANGAEA
  • 9
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    KOSMOS 2017 Peru mesocosm study: Biomass of zooplankton taxa determined by ZooScan (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-09
    Description: Biomass of zooplankton taxa in µg DM per liter as determined by ZooScan, using published area to dry weight relationships (Lehette & Hernandez-Leon 2009). 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-expanatory.
    Keywords: Abundance; Acartia spp., biomass, dry mass; Biomass; Bivalvia, biomass, dry mass; Branchiostoma spp., biomass, dry mass; Calanoida, biomass, dry mass; Ceratium spp., biomass, dry mass; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cnidaria, biomass, dry mass; Coastal Upwelling System in a Changing Ocean; Copepoda, biomass, dry mass; Copepoda, nauplii, biomass, dry mass; Corycaeidae, biomass, dry mass; Crustacea, larvae, biomass, dry mass; CUSCO; Cyclopoida, biomass, dry mass; DATE/TIME; Diatoms, centrales, biomass, dry mass; Gastropoda, biomass, dry mass; Gut fluorescence; Harpacticoida, biomass, dry mass; Hemicyclops spp., biomass, dry mass; Humboldt Current System; KOSMOS_2017; KOSMOS_2017_Peru; KOSMOS Peru; Lipid; MESO; mesocosm experiment; Mesocosm experiment; Mesocosm label; Noctilucales, biomass, dry mass; Oncaeidae, biomass, dry mass; Oxygen Minimun zone; Paracalanus spp., biomass, dry mass; Polychaeta, biomass, dry mass; Sample code/label; Sample volume; SFB754; Spionidae, biomass, dry mass; Stable isotopes; Tintinnida, biomass, dry mass; Zooplankton; Zooplankton, biomass, dry mass
    Type: Dataset
    Format: text/tab-separated-values, 2430 data points
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    DATA PANGAEA
  • 10
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    KOSMOS 2017 Peru mesocosm study: Zooplankton species/groups abundance (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-09
    Description: Zooplankton species/groups abundance table per mesocosm and sampling day. Abundances are given as individual per m-3 and individuals per liter.
    Keywords: Abundance; Abundance per volume; Biomass; Class; Climate - Biogeochemistry Interactions in the Tropical Ocean; Coastal Upwelling System in a Changing Ocean; CUSCO; DATE/TIME; Day of experiment; Gut fluorescence; Humboldt Current System; KOSMOS_2017; KOSMOS_2017_Peru; KOSMOS Peru; Life stage; Lipid; MESO; mesocosm experiment; Mesocosm experiment; Mesocosm label; Order; Oxygen Minimun zone; SFB754; Species; Stable isotopes; Treatment; Zooplankton
    Type: Dataset
    Format: text/tab-separated-values, 15477 data points
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    DATA PANGAEA
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