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  • PANGAEA  (61)
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  • 1
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    Unknown
    PANGAEA
    In:  Supplement to: Nachtsheim, Dominik A; Jerosch, Kerstin; Hagen, Wilhelm; Plötz, Joachim; Bornemann, Horst (2016): Habitat modelling of crabeater seals (Lobodon carcinophaga) in the Weddell Sea using the multivariate approach Maxent. Polar Biology, 40(5), 961-976, https://doi.org/10.1007/s00300-016-2020-0
    Publication Date: 2023-05-12
    Description: The crabeater seal (Lobodon carcinophaga) is the most abundant Antarctic seal and inhabits the circumpolar pack ice zone of the Southern Ocean. Until now, information on important environmental factors affecting its distribution as well as on foraging behaviour is limited. In austral summer 1998, 12 crabeater seals of both sexes and different age classes were equipped with satellitelinked dive recorders at Drescher Inlet (72.85°S, 19.26°E), eastern Weddell Sea. To identify suitable habitat conditions within the Weddell Sea, a maximum entropy (Maxent) modelling approach was implemented. The model revealed that the eastern and southern Weddell Sea is especially suitable for crabeater seals. Distance to the continental shelf break and sea ice concentration were the two most important parameters in modelling species distribution throughout the study period. Model predictions demonstrated that crabeater seals showed a dynamic response to their seasonally changing environment emphasized by the favoured sea ice conditions. Crabeater seals utilized ice-free waters substantially, which is potentially explained by the comparatively low sea ice cover of the Weddell Sea during summer 1998. Diving behaviour was characterized by short (〉90 % = 0-4 min) and shallow (〉90 % = 0-51 m) dives. This pattern reflects the typical summer and autumn foraging behaviour of crabeater seals. Both the distribution and foraging behaviour corresponded well with the life history of the Antarctic krill (Euphausia superba), the preferred prey of crabeater seals. In general, predicted suitable habitat conditions were congruent with probable habitats of krill, which emphasizes the strong dependence on their primary prey.
    Keywords: Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 55 datasets
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2023-04-21
    Keywords: DrescherInlet; Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 277.8 kBytes
    Location Call Number Limitation Availability
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  • 3
    Publication Date: 2023-04-21
    Keywords: DrescherInlet; Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 8.3 MBytes
    Location Call Number Limitation Availability
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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
    Location Call Number Limitation Availability
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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
    Location Call Number Limitation Availability
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  • 6
    Publication Date: 2023-01-30
    Description: Males of the four crab species Percnon affine (H. Milne Edwards, 1853), Grapsus albolineatus (Latreille in Milbert, 1812), Orisarma intermedium (Schubart &Ng, 2020), and Geothelphusa albogilva (Shy, Ng & Yu, 1994), were collected in the southern part of Taiwan in May 2007. Individuals were starved for 12 days and midgut glands were dissected before and after the starvation period. Midgut glands were lyophilized and total lipids were extracted with dichloromethane:methanol (2:1 per volume) and an aqueous solution of 0.88% KCl. Extracted lipid mass was determined gravimetrically. Lipid classes were separated and quantified using Thin-Layer Chromatography with an integrated flame ionization detector (MK-5 TLC/FID analyzer, Iatron Laboratories). Lipids were converted to fatty acids methyl esters (FAME) by applying methanol containing 3% concentrated sulfuric acid. FAMEs were quantified by gas chromatography equipped with a DB-FFAP column, a programmable temperature vaporizer injector, and a flame ionization detector. Helium was used as carrier gas. Fatty acids were identified by retention times and by using fish oil standard (Marinol). Data are supplement to: Stumpp et al (2021) Dietary preferences of brachyuran crabs from Taiwan for marine or terrestrial food sources: evidence based on fatty acid trophic markers accepted for publication in Frontiers in Zoology
    Keywords: algae; Decapoda; fatty acids; lipids; midgut gland; triacylglycerols; trophic relationships; vascular plants
    Type: Dataset
    Format: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, 202.7 kBytes
    Location Call Number Limitation Availability
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  • 7
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    Unknown
    PANGAEA
    In:  Supplement to: Nachtsheim, Dominik A; Ryan, Svenja; Schröder, Michael; Jensen, Laura; Oosthuizen, W Christiaan; Bester, Marthán Nieuwoudt; Hagen, Wilhelm; Bornemann, Horst (2019): Foraging behaviour of Weddell seals (Leptonychotes weddellii) in connection to oceanographic conditions in the southern Weddell Sea. Progress in Oceanography, 173, 165-179, https://doi.org/10.1016/j.pocean.2019.02.013
    Publication Date: 2023-03-16
    Description: The region of the Filchner Outflow System (FOS) in the southeastern Weddell Sea is characterized by intensive and complex interactions of different water masses. Dense Ice Shelf Water (ISW) emerging from beneath the ice shelf cavities on the continental shelf, meets Modified Warm Deep Water (MWDW) originating from the Antarctic Circumpolar Current at the sill of the Filchner Trough. These hydrographic features convert the FOS into an oceanographic key region, which may also show enhanced biological productivity and corresponding aggregations of marine top predators. In this context, six adult Weddell seals (Leptonychotes weddellii) were instrumented with CTD-combined satellite relay data loggers in austral summer 2014. By means of these long-term data loggers we aimed at investigating the influence of environmental conditions on the seals' foraging behaviour throughout seasons, focussing on the local oceanographic features. Weddell seals performed pelagic and demersal dives, mainly on the continental shelf, where they presumably exploited the abundant bentho-pelagic fish fauna. Diurnal and seasonal variations in light availability affected foraging activities. MWDW was associated with increased foraging effort. However, we observed differences in movements and habitat use between two different groups of Weddell seals. Seals tagged in the pack ice of the FOS focussed their foraging activities to the western and, partly, eastern flank of the Filchner Trough, which coincides with inflow pathways of MWDW. In contrast, Weddell seals tagged on the coastal fast ice exhibited typical central-place foraging and utilized resources close to their colony. High foraging effort in MWDW and high utilization of areas associated with an inflow of MWDW raise questions on the underlying biological features. This emphasizes the importance of further interdisciplinary ecological investigations in the near future, as the FOS may soon be impacted by predicted climatic changes.
    Keywords: Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 24 datasets
    Location Call Number Limitation Availability
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  • 8
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    Unknown
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2023-03-16
    Keywords: ARK-VII/2; AWI_BioOce; Biological Oceanography @ AWI; Chlorophyll a; Date/Time of event; DEPTH, water; Elevation of event; Event label; Fluorometry; Greenland Sea; Latitude of event; Longitude of event; MULT; Multiple investigations; Polarstern; PS17; PS17/098; PS17/099; PS17/100; PS17/102; PS17/103; PS17/104; PS17/105; PS17/106; PS17/107; PS17/108; PS17/109; PS17/110; PS17/111; PS17/112; PS17/113; PS17/114; PS17/115; PS17/116; PS17/117; PS17/118; PS17/119; PS17/120; PS17/121; PS17/122; PS17/123; PS17/124; PS17/125; PS17/126; PS17/127; PS17/128; PS17/129; PS17/130; PS17/131; PS17/132; PS17/134; PS17/135; PS17/136; PS17/137; PS17/138; PS17/139; PS17/140; PS17/141; PS17/142; PS17/143; PS17/144; PS17/145; PS17/146; PS17/147; PS17/148; PS17/149; PS17/151; PS17/152; PS17/153; PS17/161; PS17/162; PS17/163; PS17/164; PS17/165; PS17/166; PS17/167; PS17/168; PS17/169; PS17/170; PS17/171; PS17/172; PS17/173; PS17/174; PS17/175; PS17/176; PS17/177; PS17/178; PS17/179; PS17/180; PS17/181; PS17/182; PS17/183; PS17/184; PS17/185; PS17/186; PS17/187; PS17/188; PS17/189; PS17/190; PS17/191; PS17/192; PS17/193; PS17/194; PS17/195; PS17/196; PS17/197; PS17/198; PS17/199; PS17/200; PS17/201; PS17/202; PS17/203; PS17/204; PS17/205; PS17/206; PS17/207; PS17/208; PS17/209; PS17/210; PS17/211; PS17/212; PS17/213; PS17/214; PS17/215; PS17/216; PS17/217; PS17/218; PS17/219
    Type: Dataset
    Format: text/tab-separated-values, 1303 data points
    Location Call Number Limitation Availability
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  • 9
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    Unknown
    PANGAEA
    In:  University of Bremen, Marine Zoology | Supplement to: Bode, Maya; Koppelmann, Rolf; Teuber, Lena; Hagen, Wilhelm; Auel, Holger (2018): Carbon Budgets of Mesozooplankton Copepod Communities in the Eastern Atlantic Ocean-Regional and Vertical Patterns Between 24°N and 21°S. Global Biogeochemical Cycles, 32(5), 840-857, https://doi.org/10.1029/2017GB005807
    Publication Date: 2023-08-05
    Description: The copepods' impact on vertical carbon flux was assessed for stratified depth layers down to 2000 m at six stations along a transect between 24°N and 21°S in the eastern Atlantic Ocean in October/November 2012. Total copepod community consumption ranged from 202-604 mg C m⁻² day⁻¹, with highest ingestion rates in the tropical North Atlantic. Calanoids consumed 75-90% of the particulate organic carbon (POC) ingested by copepods, although the relative contribution of cyclopoids (mostly Oncaeidae) increased with depth. Net ingestion (=consumption - fecal pellet egestion) of POC varied from 106-379 mg C m⁻² day⁻¹ for calanoids and 37-51 mg C m⁻² day⁻¹ for cyclopoids, corresponding to 16-58% and 5-9%, respectively, of primary production (PP). In total, 9-33% and 2-5% of PP were respired as inorganic carbon by calanoids and cyclopoids, respectively. Copepod ingestion was highly variable between stations and depth layers, especially in the epi- and upper mesopelagic zone. Diel vertical migrants such as Pleuromamma enhanced the vertical flux to deeper layers, particularly in the region influenced by the Benguela Current. The impact of copepod communities on POC flux decreased below 1000 m and POC resources reaching the bathypelagic zone were far from being fully exploited by copepods. As key components, copepods are important mediators of carbon fluxes in the ocean. Their biomass, community composition and interactions strongly affect the magnitude of organic carbon recycled or exported to deeper layers. High variability, even at smaller vertical scales, emphasizes the complex dynamics of the biological carbon pump.
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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  • 10
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Jungblut, Simon; Beermann, Jan; Boos, Karin; Saborowski, Reinhard; Hagen, Wilhelm (2017): Population development of the invasive crab Hemigrapsus sanguineus (De Haan, 1853) and its potential native competitor Carcinus maenas (Linnaeus, 1758) at Helgoland (North Sea) between 2009 and 2014. Aquatic Invasions, 12(1), 85-96, https://doi.org/10.3391/ai.2017.12.1.09
    Publication Date: 2023-11-14
    Description: The Asian shore crab Hemigrapsus sanguineus (De Haan, 1853) has recently established populations in the North Sea and now occurs within the native ranges of the green crab Carcinus maenas (Linnaeus, 1758). To determine potential competitive effects and to assess the progress of the invasion, species-specific population characteristics (numerical abundances, biomasses, and size distributions) of the two species around the island of Helgoland (German Bight, southern North Sea) were compared for surveys conducted in 2009 and 2014. Sampling sites were chosen based on accessibility and differed in their topography and wave exposure, which allowed testing for the influence of these factors on the establishment success of H. sanguineus. The numerical abundance and biomass of H. sanguineus increased markedly and approached those of C. maenas in 2014. At a sheltered site, H. sanguineus even outnumbered C. maenas, whereas the converse was observed at a site exposed to strong winds and waves. Although such contrasting abundance patterns between the native and the introduced shore crab may be the result of direct interference, the dominance of H. sanguineus at the sheltered site may also be explained by enhanced larval settling rates caused by odors of conspecifics. The results suggest that the invasion of H. sanguineus has not yet reached its equilibrium, and population abundances in the North Sea are expected to further increase in the future.
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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