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  • 1
    Book
    Book
    Zur Besiedlungsgeschichte des antarktischen Schelfes am Beispiel der Isopoda (Crustacea, Malacostraca) : = Colonization of the Antarctic shelf by the iopoda (crustacea, malacostraca) (1991)
    Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung
    Details Availability
    Keywords: Hochschulschrift ; Antarktis ; Asseln ; Biogeografie
    Type of Medium: Book
    Pages: IV, 240 S. , graph. Darst., Kt.
    Series Statement: Berichte zur Polarforschung 98
    URL: http://www.gbv.de/dms/bs/toc/018455662.pdf
    URL: http://www.gbv.de/dms/bs/toc/018455662.pdf
    Language: German
    Note: Enth. Zsfassung in dt. und engl. Sprache , Zugl.: Oldenburg, Univ., Diss., 1991
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  • 2
    Electronic Resource
    Electronic Resource
    Redescription of Zonophryxus quinquedens Barnard, 1913 (Crustacea, Isopoda, Dajidae) from the Weddell Sea, Antarctica, with notes on its biology and zoogeography (1994)
    Springer
    Polar biology 14 (1994), S. 343-350 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Until now the dajid isopod species Zonophryxus quinquedens Barnard, 1913 was only described from off Cape Point, South Africa. By collecting one male and three female specimens from the Weddell Sea, Antarctica, the known range of the species and genus has to be extended to 69°58.9′S 05°08.5′E. One female specimen was found attached to the dorsal carapace of the benthopelagic decapod shrimp Nematocarcinus longirostris Bate, 1888, which served as a host for the ectoparasitic isopod. The mouthparts of the isopod penetrated directly into the heart of the shrimp. Based on the new Antarctic specimens and the type specimens of Barnard from the South African Museum, we present a redescription of Zonophryxus quinquedens. Possible conclusions from the disjunct distribution for the ecology of the species are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238450
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Composition, abundance, and diversity of peracarid crustaceans on a transect of the Kolbeinsey Ridge, north of Iceland (1993)
    Springer
    Polar biology 13 (1993), S. 565-576 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Composition, abundance, and diversity of Crustacea Peracarida were investigated on a transect across the Kolbeinsey Ridge, north of Iceland in summer 1992 during the M21/5 expedition with RV Meteor. This ridge is influenced by both the cold East Greenland Current as well as the warmer East Iceland Current, mixing with warmer Atlantic water. Sampling has been performed using an epibenthic sledge modified after Rothlishberg & Pearcy (1977). Being one of the most important components of the macrobenthic epi- and suprafauna, composition, abundance, and diversity of peracarids was significantly different on western and eastern sides of the slope. Isopoda and Amphipoda were most frequent at all stations, followed by Cumacea and Tanaidacea. Mysidacea have only been sampled on the eastern slope. Abundance and diversity were highest on the two eastern stations in depths of 830–940 meters, values decreased on the deepest eastern station in 1100 meter depth and were also low on both western stations in 830 and 860 meters depth. These differences are probably due to sediment composition and to quality and quantity of organic carbon reaching the seafloor, rather than to differences in salinity or in hydrographic regimes. The high abundance of peracarid crustaceans, especially of epibenthic species, capable of burrowing within the first centimeters of sediment, indicate their high potential of bioturbation and also their importance for benthic carbon cycling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236399
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    New results of the “EPOS” leg 3 cruise to antarctica: Horizontal and vertical distribution of isopods (Crustacea) in the eastern Weddell Sea (1992)
    Springer
    Polar biology 12 (1992), S. 121-128 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A comparison of the “EPOS” leg 3 material of Weddell Sea Isopoda with the known literature data revealed some new results for the horizontal and vertical distribution of isopods in the eastern Weddell Sea. The number of isopod species known for the Weddell Sea almost doubled to 118 species. New results on the vertical distribution of 11 isopod genera are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239972
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Origin of Antarctic Isopoda (Crustacea, Malacostraca) (1992)
    Springer
    Marine biology 113 (1992), S. 415-423 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An analysis of the horizontal and the vertical zonation of the Antarctic Isopoda, combined with knowledge of the geological history of Antarctica and isopod phylogeny, revealed that the isopod family Serolidae and subfamily Arcturinae are likely to have evolved from ancestors that inhabited a cold-temperate Gondwanian province. Antarctic species of other families, such as the Munnopsidae, Nannoniscidae, Desmosomatidae and Ischnomesidae, are likely to have evolved from deep-sea ancestors. It is deduced that emigration of South Patagonian species into the Southern Ocean, although possible, probably did not occur very often. Evolutionary phenomena such as continental-drift vicariance, radiation of species on the continental shelf of Antarctica, and active migration, including submergence and emergence mechanisms are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349167
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    Paper (German National Licenses)
    Fulltext
  • 6
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    Zur Besiedlungsgeschichte des antarktischen Schelfes am Beispiel der Isopoda (Crustacea, Malacostraca) = Colonization of the Antarctic shelf by the lopoda (Crustacea, Malacostraca) (1991)
    In:  (PhD/ Doctoral thesis), Universität Oldenburg, Oldenburg, Germany, 98 pp . Berichte zur Polarforschung, 98 .
    Details
    Publication Date: 2015-06-11
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 7
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    Sea-ice habitat minimizes grazing impact and predation risk for larval Antarctic krill (2021)
    In:  EPIC3Polar Biology, ISSN: 0722-4060
    Details
    Publication Date: 2021-05-19
    Description: Survival of larval Antarctic krill (Euphausia superba) during winter is largely dependent upon the presence of sea ice as it provides an important source of food and shelter. We hypothesized that sea ice provides additional benefits because it hosts fewer competitors and provides reduced predation risk for krill larvae than the water column. To test our hypothesis, zooplankton were sampled in the Weddell-Scotia Confluence Zone at the ice-water interface (0–2 m) and in the water column (0–500 m) during August–October 2013. Grazing by mesozooplankton, expressed as a percentage of the phytoplankton standing stock, was higher in the water column (1.97 ± 1.84%) than at the ice-water interface (0.08 ± 0.09%), due to a high abundance of pelagic copepods. Predation risk by carnivorous macrozooplankton, expressed as a percentage of the mesozooplankton standing stock, was significantly lower at the ice-water interface (0.83 ± 0.57%; main predators amphipods, siphonophores and ctenophores) than in the water column (4.72 ± 5.85%; main predators chaetognaths and medusae). These results emphasize the important role of sea ice as a suitable winter habitat for larval krill with fewer competitors and lower predation risk. These benefits should be taken into account when considering the response of Antarctic krill to projected declines in sea ice. Whether reduced sea-ice algal production may be compensated for by increased water column production remains unclear, but the shelter provided by sea ice would be significantly reduced or disappear, thus increasing the predation risk on krill larvae.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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  • 8
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    Systematic identification of microplastics in abyssal and hadal sediments of the Kuril Kamchatka trench (2021)
    In:  EPIC3Environmental Pollution, 269, pp. 116095, ISSN: 02697491
    Details
    Publication Date: 2021-04-08
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 9
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    Abundance and Distributional Patterns of Benthic Peracarid Crustaceans From the Atlantic Sector of the Southern Ocean and Weddell Sea (2020)
    In:  EPIC3Frontiers in Marine Science, 7, ISSN: 2296-7745
    Details
    Publication Date: 2021-01-04
    Description: Climate change is influencing some environmental variables in the Southern Ocean (SO) and this will have an effect on the marine biodiversity. Peracarid crustaceans are one of the dominant and most species-rich groups of the SO benthos. To date, our knowledge on the influence of environmental variables in shaping abundance and species composition in the SO’s peracarid assemblages is limited, and with regard to ice coverage it is unknown. The aim of our study was to assess the influence of sea ice coverage, chlorophyll-a, and phytoplankton concentrations on abundance, distribution and assemblage structure of peracarids. In addition, the influence of other physical parameters on peracarid abundance was assessed, including depth, temperature, salinity, sediment type, current velocity, oxygen, iron, nitrate, silicate and phosphate. Peracarids were sampled with an epibenthic sledge (EBS) in different areas of the Atlantic sector of the SO and in the Weddell Sea. Sampling areas were characterized by different regimes of ice coverage (the ice free South Orkney Islands, the seasonally ice-covered Filchner Trough and the Eastern Antarctic Peninsula including the Prince Gustav Channel which was formerly covered by a perennial ice shelf). In total 64766 individuals of peracarids were collected and identified to order level including five orders: Amphipoda, Cumacea, Isopoda, Mysidacea, and Tanaidacea. Amphipoda was the most abundant taxon, representing 32% of the overall abundances, followed by Cumacea (31%), Isopoda (29%), Mysidacea (4%), and Tanaidacea (4%). The Filchner Trough had the highest abundance of peracarids, while the South Orkney Islands showed the lowest abundance compared to other areas. Ice coverage was the main environmental driver shaping the abundance pattern and assemblage structure of peracarids and the latter were positively correlated with ice coverage and chlorophyll-a concentration. We propose that the positive correlation between sea ice and peracarid abundances is likely due to phytoplankton blooms triggered by seasonal sea ice melting, which might increase the food availability for benthos. Variations in ice coverage extent and seasonality due to climate change would strongly influence the abundance and assemblage structure of benthic peracarids.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
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    Systematic identification of microplastics in abyssal and hadal sediments of the Kuril Kamchatka trench (2021)
    ELSEVIER SCI LTD
    In:  EPIC3Environmental Pollution, ELSEVIER SCI LTD, 269(116095), ISSN: 0269-7491
    Details
    Publication Date: 2021-03-22
    Description: The occurrence of microplastics throughout marine environments worldwide, from pelagic to benthic habitats, has become serious cause for concern. Hadal zones were recently described as the “trash bins of the oceans” and ultimate sink for marine plastic debris. The Kuril region covers a substantial area of the North Pacific Ocean and is characterised by high biological productivity, intense marine traffic through the Kuril straits, and anthropogenic activity. Moreover, strong tidal currents and eddy activity, as well as the influence of Pacific currents, have the potential for long distance transport and retention of microplastics in this area. To verify the hypothesis that the underlying Kuril Kamchatka Trench might accumulate microplastics from the surrounding environments and act as the final sink for high quantities of microplastics, we analysed eight sediment samples collected in the Kuril Kamchatka Trench at a depth range of 5143–8250 m during the Kuril Kamchatka Biodiversity Studies II (KuramBio II) expedition in summer 2016. Microplastics were characterised via Micro Fourier Transform Infrared spectroscopy. All samples were analysed in their entirety to avoid inaccuracies due to extrapolations of microplastic concentrations and polymer diversities, which would otherwise be based on commonly applied representative aliquots. The number of microplastic particles detected ranged from 14 to 209 kg−1 sediment (dry weight) with a total of 15 different plastic polymers detected. Polypropylene accounted for the largest proportion (33.2%), followed by acrylates/polyurethane/varnish (19%) and oxidized polypropylene (17.4%). By comparing extrapolated sample aliquots with in toto results, it was shown that aliquot-based extrapolations lead to severe under- or overestimations of microplastic concentrations, and an underestimation of polymer diversity.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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