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  • 2015-2019  (20)
  • 2019  (3)
  • 2015  (17)
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  • 2015-2019  (20)
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  • 1
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    Crabeater seals (Lobodon carcinophaga) in the Weddell Sea during DRE1998 campaign, with link to shapefiles of filtered and unfiltered seal locations for ArcGIS visualisation (2015)
    PANGAEA
    Details
    Publication Date: 2023-04-21
    Keywords: DrescherInlet; Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 277.8 kBytes
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  • 2
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    Crabeater seals (Lobodon carcinophaga) in the Weddell Sea during DRE1998 campaign, with link to files of gridded seal locations and environmental parameters for Maxent analyses (2015)
    PANGAEA
    Details
    Publication Date: 2023-04-21
    Keywords: DrescherInlet; Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 8.3 MBytes
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    DATA PANGAEA
  • 3
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    Fatty acid and stable isotope composition of calanoid copepods in the open eastern Atlantic Ocean during POLARSTERN cruise ANT-XXIX/1 (2015)
    PANGAEA
    In:  Supplement to: Bode, Maya; Hagen, Wilhelm; Schukat, Anna; Teuber, Lena; Fonseca-Batista, Debany; Dehairs, Frank; Auel, Holger (2015): Feeding strategies of tropical and subtropical calanoid copepods throughout the eastern Atlantic Ocean – Latitudinal and bathymetric aspects. Progress in Oceanography, 138, 268-282, https://doi.org/10.1016/j.pocean.2015.10.002
    Details
    Publication Date: 2024-03-09
    Description: The majority of global ocean production and total export production is attributed to oligotrophic oceanic regions due to their vast regional expanse. However, energy transfers, food-web structures and trophic relationships in these areas remain largely unknown. Regional and vertical inter- and intra-specific differences in trophic interactions and dietary preferences of calanoid copepods were investigated in four different regions in the open eastern Atlantic Ocean (38°N to 21°S) in October/November 2012 using a combination of fatty acid (FA) and stable isotope (SI) analyses. Mean carnivory indices (CI) based on FA trophic markers generally agreed with trophic positions (TP) derived from d15N analysis. Most copepods were classified as omnivorous (CI ~0.5, TP 1.8 to ~2.5) or carnivorous (CI 〉=0.7, TP 〉=2.9). Herbivorous copepods showed typical CIs of 〈=0.3. Geographical differences in d15N values of epi- (200-0 m) to mesopelagic (1000-200 m) copepods reflected corresponding spatial differences in baseline d15N of particulate organic matter from the upper 100 m. In contrast, species restricted to lower meso- and bathypelagic (2000-1000 m) layers did not show this regional trend. FA compositions were species-specific without distinct intra-specific vertical or spatial variations. Differences were only observed in the southernmost region influenced by the highly productive Benguela Current. Apparently, food availability and dietary composition were widely homogeneous throughout the oligotrophic oceanic regions of the tropical and subtropical Atlantic. Four major species clusters were identified by principal component analysis based on FA compositions. Vertically migrating species clustered with epi- to mesopelagic, non-migrating species, of which only Neocalanus gracilis was moderately enriched in lipids with 16% of dry mass (DM) and stored wax esters (WE) with 37% of total lipid (TL). All other species of this cluster had low lipid contents (〈 10% DM) without WE. Of these, the tropical epipelagic Undinula vulgaris showed highest portions of bacterial markers. Rhincalanus cornutus, R. nasutus and Calanoides carinatus formed three separate clusters with species-specific lipid profiles, high lipid contents (〉=41% DM), mainly accumulated as WE (〉=79% TL). C. carinatus and R. nasutus were primarily herbivorous with almost no bacterial input. Despite deviating feeding strategies, R. nasutus clustered with deep-dwelling, carnivorous species, which had high amounts of lipids (〉=37% DM) and WE (〉=54% TL). Tropical and subtropical calanoid copepods exhibited a wide variety of life strategies, characterized by specialized feeding. This allows them, together with vertical habitat partitioning, to maintain high abundance and diversity in tropical oligotrophic open oceans, where they play an essential role in the energy flux and carbon cycling.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    Stable isotope composition of calanoid copepods in the open eastern Atlantic Ocean during POLARSTERN cruise ANT-XXIX/1 (2015)
    PANGAEA
    Details
    Publication Date: 2024-03-09
    Keywords: ANT-XXIX/1; Canarias Sea; Carbon, total; Carbon/Nitrogen ratio; Date/Time of event; Depth, bottom/max; Depth, top/min; Dry mass per individual; Elevation of event; Event label; Latitude of event; Lipid corrected d13C/12C for crustaceans; Longitude of event; MSN; Multiple opening/closing net; Nitrogen, total; Number of individuals; Polarstern; PS81; PS81/001-3; PS81/002-3; PS81/004-4; PS81/005-6; PS81/007-2; PS81/008-6; PS81/009-4; PS81/010-3; PS81/011-4; PS81/012-4; PS81/013-6; PS81/014-4; PS81/015-2; PS81/016-4; PS81/017-7; South Atlantic Ocean; Species; Stage; Station label; δ13C/12C ratio; δ15N/14N ratio
    Type: Dataset
    Format: text/tab-separated-values, 4432 data points
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  • 5
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    Electron transport system (ETS) activity and respiration rates of pelagic decapods from the Benguela upwelling system during D356 and MSM17/3 (2015)
    PANGAEA
    Details
    Publication Date: 2024-03-13
    Keywords: Benguela Upwelling; D356; D356-11_5; D356-15_2; D356-21_2_1; D356-23_2; D356-32_5; D356-8_1; Date/Time of event; Depth, bottom/max; Depth, top/min; DEPTH, water; Discovery (1962); Double MOCNESS 333; Dry mass per individual; Duration; Electron transport system activity of oyxgen; Electron transport system activity of oyxgen per individual; Event label; GENUS; Geochemistry and ecology of the Namibian upwelling system; Latitude of event; Life stage; Longitude of event; Maria S. Merian; MOC-D-333; MOC-S-2000; MSM17/3; MSM17/3_246-8; MSM17/3_292-9; MSM17/3_298-12; MSM17/3_301-2; MSM17/3_310-3; MSM17/3_315-5; Respiration rate, oxygen; Respiration rate, oxygen, per individual; Ring trawl; RTR; Sample ID; Singel MOCNESS 2000; Species; T1-1; T1-3a; T5-1a; T5-2; T8-1d; Temperature, technical; Wet mass per individual; WKT-2b
    Type: Dataset
    Format: text/tab-separated-values, 637 data points
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  • 6
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    Abundance of pelagic decapods in the northern Benguela upwelling system during AFR258, D356 and MSM17/3 (2015)
    PANGAEA
    Details
    Publication Date: 2024-03-13
    Keywords: Abundance per area; Abundance per volume; AFR258; AFR258_30254_7; AFR258_30257_7; AFR258_30259_6; AFR258_30260_7; AFR258_30261_6; AFR258_30263_6; Africana (1982); Benguela Upwelling; D356; D356-15_3; D356-16_3; D356-23_2; D356-25_1; D356-28_6; D356-8_1; D356-8_2_6_2; Date/Time of event; Depth, bottom/max; Depth, top/min; DEPTH, water; Discovery (1962); Double MOCNESS 333; Event label; GENUS; Geochemistry and ecology of the Namibian upwelling system; Latitude of event; Life stage; Longitude of event; Maria S. Merian; MOC-D-333; MOC-S-2000; MSM17/3; MSM17/3_241-13; MSM17/3_242-13; MSM17/3_242-9; MSM17/3_243-1; MSM17/3_243-12; MSM17/3_250-7; MSM17/3_292-9; MSM17/3_295-12; MSM17/3_295-6; MSM17/3_298-12; MSM17/3_298-8; MSM17/3_306-13; MSM17/3_307-11; MSM17/3_307-2; MSM17/3_309-11; MSM17/3_309-2; MSM17/3_310-3; MSM17/3_310-7; PHY-NET; Phytoplankton net, Apstein-type; Singel MOCNESS 2000; Species; T1-1; T1-2; T-1-2_6; T1-3a; T1-4a; T-2-2_7; T5-1; T-5-1_7; T5-1a; T-5-1a_7; T5-2; T8-1; T8-1a; T-8-1a_6; T8-1b; T8-1c; T-8-3_6
    Type: Dataset
    Format: text/tab-separated-values, 1626 data points
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  • 7
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    Abundance, Electron transport System (ETS) activity and respiration rates of pelagic decapods from the Benguela upwelling system during AFR258, D356 and MSM17/3 (2015)
    PANGAEA
    In:  Supplement to: Schukat, Anna; Bode, Maya; Auel, Holger; Carballo, Rodrigo; Martin, Bettina; Koppelmann, Rolf; Hagen, Wilhelm (2013): Pelagic decapods in the northern Benguela upwelling system: Distribution, ecophysiology and contribution to active carbon flux. Deep Sea Research Part I: Oceanographic Research Papers, 75, 146-156, https://doi.org/10.1016/j.dsr.2013.02.003
    Details
    Publication Date: 2024-03-13
    Description: Decapods were sampled with a 1 m**2 MOCNESS (mainly upper 1000 m) in the northern Benguela Current during three cruises in December 2009, September/October 2010 and February 2011. Although pelagic decapods are abundant members of the micronekton community, information about their ecophysiology is very limited. Species-specific regional distribution limits were detected for various decapod species (e.g. Plesionika carinata, Sergestes arcticus, Pasiphaea semispinosa). Significant diel vertical migration patterns were determined for three caridean and three penaeiodean species. Biomass was variable and ranged from 23 to 2770 mg dry mass m**-2 with highest values for P. semispinosa. Fatty acid and stable isotope analyses revealed that the examined decapod species are omnivorous tocarnivorous except for the herbivorous to omnivorous species P. carinata. Calanid copepods such as Calanoides carinatus were identified as an important prey item especially for caridean species. Community consumption rates of pelagic decapods derived from respiration rates ranged from 7 mg C m**-2 d**-1 (231S) to 420 mg C m**-2 d**-1 (191S, 171S). A potential active respiratory carbon flux was calculated for migrating pelagic decapods with 4.4 mg C m**- d**-1 for the upper 200 m and with 2.6 mg C m**-2 d**-1 from the base of the euphotic zone to a depth of 600 m. Overall, pelagic decapods apparently play a more prominent role in the northern Benguela Current ecosystem than previously assumed and may exert a substantial predation impact on calanid copepods (up to 13% d**-1 of standing stock).
    Keywords: GENUS; Geochemistry and ecology of the Namibian upwelling system
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    Fatty acid composition of calanoid copepods in the open eastern Atlantic Ocean during POLARSTERN cruise ANT-XXIX/1 (2015)
    PANGAEA
    Details
    Publication Date: 2024-04-24
    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; 9-Tetradecenoic acid of total fatty acids; all-cis-11,14,17-Eicosatrienoic acid of total fatty acids; all-cis-11,14-Eicosadienoic acid of total fatty acids; all-cis-11,14-Octadecadienoic acid of total fatty acids; all-cis-13,16-Docosadienoic 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-5,8,11,14-Eicosatetraenoic acid of total fatty acids; all-cis-6,9,12,15-Octadecatetraenoic acid of total fatty acids; all-cis-6,9,12-Octadecatrienoic acid of total fatty acids; all-cis-7,10,13,16,19-Docosapentaenoic acid of total fatty acids; all-cis-8,11,14,17-Eicosatetraenoic acid of total fatty acids; all-cis-8,11,14-Eicosatrienoic acid of total fatty acids; all-cis-8,11,14-Octadecatrienoic 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; ANT-XXIX/1; Canarias Sea; cis-11-Docosenoic acid of total fatty acids; cis-11-Hexadecenoic acid of total fatty acids (IUPAC: (11Z)-hexadec-11-enoic acid); cis-11-Icosenoic acid of total fatty acids; cis-11-Octadecenoic acid of total fatty acids (IUPAC: Octadec-11-enoic acid); cis-13-Docosenoic acid of total fatty acids; cis-13-Icosenoic acid of total fatty acids; cis-13-Octadecenoic acid of total fatty acids; cis-15-Docosenoic acid of total fatty acids; cis-15-Tetracosenoic 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-Hexadecenol of total fatty alcohols; cis-9-Icosanoic acid of total fatty acids; cis-9-Octadecenoic acid of total fatty acids (IUPAC: Octadec-9-enoic acid); Date/Time of event; Depth, bottom/max; Depth, top/min; Docosanoic acid of total fatty acids; Docosatetraenoic acid 22:4(n-3) of total fatty acids; Dry mass; Elevation of event; Event label; Fatty alcohols; Heptadecanoic acid of total fatty acids; Hexadecanoic acid of total fatty acids; Hexadecanol of total fatty alcohols; Icosanoic acid of total fatty acids; iso-Heptadecanoic acid of total fatty acids (IUPAC: 15-methylhexadecanoic acid); iso-Pentadecanoic acid of total fatty acids (IUPAC: 13-methyltetradecanoic acid); Latitude of event; Lipids; Longitude of event; MSN; Multiple opening/closing net; Number of individuals; Octadecanoic acid of total fatty acids; Octadecanol of total fatty alcohols; Octadecenol of total fatty alcohols; Pentadecanoic acid of total fatty acids; Phytanic acid of total fatty acids; Polarstern; PS81; PS81/005-6; PS81/007-2; PS81/008-6; PS81/009-4; PS81/010-3; PS81/011-4; PS81/012-4; PS81/013-6; PS81/014-4; PS81/015-2; PS81/016-4; PS81/017-7; Sample ID; South Atlantic Ocean; Species; Stage; Station label; Tetracosenoic acid 24:1(n-11) of total fatty acids; Tetradecanoic acid of total fatty acids; Tetradecanol of total alcohols; Wax esters
    Type: Dataset
    Format: text/tab-separated-values, 10265 data points
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  • 9
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    Predatory zooplankton on the move: Themisto amphipods in high-latitude marine pelagic food webs (2019)
    Elsevier
    In:  EPIC3Advances in Marine Biology Vol. 82, Advances in Marine Biology, Elsevier, 42 p., pp. 51-92, ISBN: 978-0-08-102914-5
    Details
    Publication Date: 2020-02-01
    Description: Hyperiid amphipods are predatory pelagic crustaceans that are particularly prevalent in high-latitude oceans. Many species are likely to have co-evolved with soft-bodied zooplankton groups such as salps and medusae, using them as substrate, for food, shelter or reproduction. Compared to other pelagic groups, such as fish, euphausiids and soft-bodied zooplankton, hyperiid amphipods are poorly studied especially in terms of their distribution and ecology. Hyperiids of the genus Themisto, comprising seven distinct species, are key players in temperate and cold-water pelagic ecosystems where they reach enormous levels of biomass. In these areas, they are important components of marine food webs, and they are major prey for many commercially important fish and squid stocks. In northern parts of the Southern Ocean, Themisto are so prevalent that they are considered to take on the role that Antarctic krill play further south. Nevertheless, although they are around the same size as krill, and may also occur in swarms, their feeding behaviour and mode of reproduction are completely different, hence their respective impacts on ecosystem structure differ. Themisto are major predators of meso- and macrozooplankton in several major oceanic regions covering shelves to open ocean from the polar regions to the subtropics. Based on a combination of published and unpublished occurrence data, we plot out the distributions of the seven species of Themisto. Further, we consider the different predators that rely on Themisto for a large fraction of their diet, demonstrating their major importance for higher trophic levels such as fish, seabirds and mammals. For instance, T. gaudichaudii in the Southern Ocean comprises a major part of the diets of around 80 different species of squid, fish, seabirds and marine mammals, while T. libellula in the Bering Sea and Greenland waters is a main prey item for commercially exploited fish species. We also consider the ongoing and predicted range expansions of Themisto species in light of environmental changes. In northern high latitudes, sub-Arctic Themisto species are replacing truly Arctic, ice-bound, species. In the Southern Ocean, a range expansion of T. gaudichaudii is expected as water masses warm, impacting higher trophic levels and biogeochemical cycles. We identify the many knowlegde gaps that must be filled in order to evaluate, monitor and predict the ecological shifts that will result from the changing patterns of distribution and abundance of this important pelagic group.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
    Format: application/pdf
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  • 10
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    Seasonal lipid dynamics of the shrimps Crangon crangon and Pandalus montagui in the German Bight (North Sea) (2019)
    INTER-RESEARCH
    In:  EPIC3Marine Ecology-Progress Series, INTER-RESEARCH, 625, pp. 41-52, ISSN: 0171-8630
    Details
    Publication Date: 2019-10-09
    Description: Environmental fluctuations can impose energetic constraints on organisms in terms of food shortage or compensation for metabolic stress. To better understand the biochemical strategies that support adaptive physiological processes in variable environments, we studied the lipid dynamics of the brown shrimp Crangon crangon and the pink shrimp Pandalus montagui by analysing their midgut glands during an annual cycle. Both species have an overlapping distribu- tion range in the southern North Sea, but differ in their habitat preferences, reproductive strate- gies, and life-history traits. C. crangon showed minor total lipid accumulation in their midgut glands, ranging between 14 and 17% of dry mass (DM), dominated by phospholipids. In contrast, P. montagui stored significantly larger amounts of total lipid (47−70% DM, mainly triacylglycer- ols) and showed a distinct seasonal cycle in lipid accumulation with a maximum in summer. Fatty acid trophic markers indicated a wide food spectrum for both species, with higher preferences of P. montagui for microalgae. In C. crangon, feeding preferences were less distinct due the low total lipid levels in the midgut gland. PCA based on fatty acid compositions of both species suggested that C. crangon has a broader dietary spectrum than P. montagui. C. crangon seems to have the capacity to use sufficient energy directly from ingested food to fuel all metabolic requirements, including multiple spawnings, without building up large lipid reserves in the midgut gland. P. montagui, in contrast, relies more on the energy storage function of the midgut gland to over- come food scarcity and to allocate lipids for reproduction.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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