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  • 2015-2019  (10)
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  • 1
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    Aquatische Optische Technologien in Deutschland (2015)
    IOW
    In:  Meereswissenschaftliche Berichte, 97 . IOW, Warnemünde, Germany, 92 pp.
    Details
    Publication Date: 2019-09-23
    Description: Optic technologies and methods/procedures are established across all areas and scales in limnic and marine research in Germany and develop further continuously. The working group “Aquatic Optic Technologies” (AOT) constitutes a common platform for knowledge transfer among scientists and users, provides a synergistic environment for the national developer community and will enhance the international visibility of the German activities in this field. This document summarizes the AOT-procedures and -techniques applied by national research institutions. We expect to initiate a trend towards harmonization across institutes. This will facilitate the establishment of open standards, provide better access to documentation, and render technical assistance for systems integration. The document consists of the parts: Platforms and carrier systems outlines the main application areas and the used technologies. Focus parameters specifies the parameters measured by means of optical methods/techniques and indicates to which extent these parameters have a socio-political dimension. Methods presents the individual optical sensors and their underlying physical methods. Similarities denominates the common space of AOT-techniques and applications. National developments lists projects and developer groups in Germany designing optical high-technologies for limnic and marine scientific purposes.
    Type: Report , NonPeerReviewed
    Format: text
    DOI: 10.12754/msr-2015-0097
    Location Call Number Limitation Availability
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    OceanRep: Report - other report
  • 2
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    Partial decoupling from the temperature size rule by North Sea copepods (2019)
    In:  EPIC3Marine Biology, 166(5), ISSN: 0025-3162
    Details
    Publication Date: 2019-05-06
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 3
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    A seasonal comparison of zooplankton communities in the Kara Sea – With special emphasis on overwintering traits (2016)
    In:  EPIC3Estuarine, Coastal and Shelf Science, 175, pp. 146-156, ISSN: 02727714
    Details
    Publication Date: 2017-01-16
    Description: Siberian marginal seas cover large parts of the marine Arctic and host unique zooplankton communities. Detailed knowledge of their community structure and life history traits is a prerequisite to predict their response to ongoing and future climate and anthropogenic changes although winter data is extremely rare. Here data are presented from winter samples (February and April) in four biogeographic regions of the Kara Sea. Comparison of community composition and zooplankton abundance/biomass with data collected during summer showed lower diversity in winter, mainly due to the absence of freshwater species. In contrast to many other northern regions, seasonal biomass differences were relatively small. Year-round high biomass is maintained through a large share of small copepod species and constantly high share of the chaetognath Parasagitta elegans. An advanced state of gonad maturation and reproduction was observed in winter in herbivorous, omnivorous, and carnivorous species, e.g. the copepods Calanus glacialis, Drepanopus bungei, Limnocalanus macrurus, Oithona similis, Pseudocalanus major, Pseudocalanus minutus/acuspes, Paraeuchaeta glacialis, Microcalanus pygmaeus, and euphausiids, hydromedusae, and pteropods. Meroplanktonic larvae of nudibranchia, polychaeta and bivalvia were also registered. Close to the Yenisei mouth, abundance of eggs and larvae of various taxa exceeded older stages. Our data show that the brackish-water zone of the Kara Sea hosts specific communities with omnivorous species efficiently exploiting local resources during the winter and utilizing them for winter reproduction.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 4
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    Aquatische Optische Technologien in Deutschland (2015)
    IOW Warnemünde
    In:  EPIC3Marine Science Reports - Meereswissenschaftliche Berichte, IOW Warnemünde, 97, pp. 1-83, ISSN: 2195-657X
    Details
    Publication Date: 2016-01-13
    Description: Optic technologies and methods/procedures are established across all areas and scales in limnic and marine research in Germany and develop further continuously. The working group “Aquatic Optic Technologies” (AOT) constitutes a common platform for knowledge transfer among scientists and users, provides a synergistic environment for the national developer community and will enhance the international visibility of the German activities in this field. This document summarizes the AOT-procedures and -techniques applied by national research institutions. We expect to initiate a trend towards harmonization across institutes. This will facilitate the establishment of open standards, provide better access to documentation, and render technical assistance for systems integration. The document consists of the parts: Platforms and carrier systems outlines the main application areas and the used technologies. Focus parameters specifies the parameters measured by means of optical methods/techniques and indicates to which extent these parameters have a socio-political dimension. Methods presents the individual optical sensors and their underlying physical methods. Similarities denominates the common space of AOT-techniques and applications. National developments lists projects and developer groups in Germany designing optical hightechnologies for limnic and marine scientific purposes.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 5
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    Near-bottom zooplankton aggregations in Kongsfjorden: implications for pelago-benthic coupling (2016)
    SPRINGER
    In:  EPIC3Polar Biology, SPRINGER, 39(10), pp. 1897-1912, ISSN: 0722-4060
    Details
    Publication Date: 2017-06-07
    Description: Near-bottom zooplankton communities have rarely been studied despite numerous reports of high zooplankton concentrations, probably due to methodological constraints. In Kongsfjorden, Svalbard, the near-bottom layer was studied for the first time by combining daytime deployments of a remotely operated vehicle (ROV), the optical zooplankton sensor moored on-sight key species investigation (MOKI), and Tucker trawl sampling. ROV data from the fjord entrance and the inner fjord showed high near-bottom abundances of euphausiids with a mean concentration of 17.3 ± 3.5 n x 100 m^-3. With the MOKI system, we observed varying numbers of euphausiids, amphipods, chaetognaths, and copepods on the seafloor at six stations. Light-induced zooplankton swarms reached densities in the order of 90,000 (euphausiids), 120,000 (amphipods), and 470,000 ind m^-3 (chaetognaths), whereas older copepodids of Calanus hyperboreus and C. glacialis did not respond to light. They were abundant at the seafloor and 5 and 15 m above and showed maximum abundance of 65,000 ind m^-3. Tucker trawl data provided an overview of the seasonal vertical distribution of euphausiids. The most abundant species Thysanoessa inermis reached near-bottom concentrations of 270 ind m^-3. Regional distribution was neither related to depth nor to location in the fjord. The taxa observed were all part of the pelagic community. Our observations suggest the presence of near-bottom macrozooplankton also in other regions and challenge the current view of bentho–pelagic coupling. Neglecting this community may cause severe underestimates of the stock of pelagic zooplankton, especially predatory species, which link secondary production with higher trophic levels.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 6
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    Station list and links to master tracks in different resolutions of POLARSTERN cruise ARK-IX/3, Tromsø - Tromsø, 1993-06-25 - 1993-08-05 (2015)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-03-16
    Keywords: ARK-IX/3; Calculated; Course; CT; DATE/TIME; LATITUDE; LONGITUDE; Polarstern; PS26/3-track; PS26 NEW; Speed; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 12092 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Prosome length frequencies of five calanoid copepod species from Helgoland Roads, North Sea, between 2000 and 2005 (2018)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-07-06
    Keywords: File content; File format; File name; File size; German Bight, North Sea; HelgolandRoads_copepod; Kabeltonne; MON; Monitoring; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Monthly means of female prosome lengths of six calanoid copepod species from Helgoland Roads, North Sea (2018)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-07-06
    Keywords: Acartia clausi, female, prosome length; Acartia clausi, female, prosome length, standard deviation; Centropages hamatus, female, prosome length; Centropages hamatus, female, prosome length, standard deviation; Centropages typicus, female, prosome length; Centropages typicus, female, prosome length, standard deviation; DATE/TIME; DEPTH, water; German Bight, North Sea; HelgolandRoads_copepod; Kabeltonne; MON; Monitoring; Number of specimens; Paracalanus parvus, female, prosome length; Paracalanus parvus, female, prosome length, standard deviation; Pseudocalanus spp., female, prosome length; Pseudocalanus spp., female, prosome length, standard deviation; Temora longicornis, female, prosome length; Temora longicornis, female, prosome length, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 2391 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Female prosome lengths of six calanoid copepod species from Helgoland Roads, North Sea (2018)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven | Supplement to: Hirche, Hans-Juergen; Boersma, Maarten; Wiltshire, Karen Helen (2019): Partial decoupling from the temperature size rule by North Sea copepods. Marine Biology, 166(5), https://doi.org/10.1007/s00227-019-3503-7
    Details
    Publication Date: 2023-07-06
    Description: In temperate seas, multi-voltine copepods show a pronounced seasonal variability in body size, which affects both their reproductive capacity and their accessibility to size -selective predators. Here, we studied seasonal changes of female prosome length from six common copepods, Acartia clausi, Centropages hamatus, Centropages typicus, Paracalanus parvus, Pseudocalanus elongatus, and Temora longicornis between 2000 and 2005 at the time series station Helgoland Roads, southern North Sea. We observed no significant effect of food (measured as phytoplankton carbon content) with size of adult females. Moreover, in none of the species investigated was prosome length significantly correlated with temperature when considering the whole year. Instead, all species had a period of temperature-related size, but for the size distribution during the rest of the year we distinguished two groups of species. Group 1 (Acartia clausi, Centropages hamatus, and Pseudocalanus elongatus ) had a resting phase with females of the same size persisting for 〉 half a year, while in group 2 the time after the temperature-related phase was characterized by irregular size distributions. A female resting phase of Acartia clausi, Centropages hamatus, and Pseudocalanus elongatus has been hitherto unknown. Size distribution control after the temperature-related phase in group 2 is as yet not understood, but the awakening/hatching of resting eggs and/or copepodids may be found to be involved.
    Keywords: German Bight, North Sea; HelgolandRoads_copepod; Kabeltonne; MON; Monitoring
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Near-bottom zooplankton aggregations in Kongsfjorden with link to images from the optical zooplankton sensor MOKI (2015)
    PANGAEA
    In:  Supplement to: Hirche, Hans-Juergen; Laudien, Jürgen; Buchholz, Friedrich (2015): Near-bottom zooplankton aggregations in Kongsfjorden: implications for pelago-benthic coupling. Polar Biology, https://doi.org/10.1007/s00300-015-1799-4
    Details
    Publication Date: 2024-03-01
    Description: Near-bottom zooplankton communities have rarely been studied despite numerous reports of high zooplankton concentrations, probably due to methodological constraints. In Kongsfjorden, Svalbard, the near-bottom layer was studied for the first time by combining daytime deployments of a remotely operated vehicle (ROV), the optical zooplankton sensor moored on-sight key species investigation (MOKI), and Tucker trawl sampling. ROV data from the fjord entrance and the inner fjord showed high near-bottom abundances of euphausiids with a mean concentration of 17.3 ± 3.5 n/100 m**3. With the MOKI system, we observed varying numbers of euphausiids, amphipods, chaetognaths, and copepods on the seafloor at six stations. Light-induced zooplankton swarms reached densities in the order of 90,000 (euphausiids), 120,000 (amphipods), and 470,000 ind/m**3 (chaetognaths), whereas older copepodids of Calanus hyperboreus and C. glacialis did not respond to light. They were abundant at the seafloor and 5 m above and showed maximum abundance of 65,000 ind/m**3. Tucker trawl data provided an overview of the seasonal vertical distribution of euphausiids. The most abundant species Thysanoessa inermis reached near-bottom concentrations of 270 ind/m**3. Regional distribution was neither related to depth nor to location in the fjord. The taxa observed were all part of the pelagic community. Our observations suggest the presence of near-bottom macrozooplankton also in other regions and challenge the current view of bentho-pelagic coupling. Neglecting this community may cause severe underestimates of the stock of elagic zooplankton, especially predatory species, which link secondary production with higher trophic levels.
    Keywords: AWI_BPP; Bentho-Pelagic Processes @ AWI; DATE/TIME; DEPTH, water; File name; File size; Kongsfjorden, Spitsbergen, Arctic; Latitude of event; Longitude of event; M1; M1_NearBlomstrand; M2; M2_NearKongsbreen; M3; M3_Kongsfjordneset; M4; M4_CrossNyAlesund; M5; M5_Juttaholmen; M6; M6_Midtholmen; MOKI; Moored onsight keyspecies investigation; Moored onsight keyspecies investigation (MOKI); Optional event label; Uniform resource locator/link to image
    Type: Dataset
    Format: text/tab-separated-values, 666 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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