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  • 1
    Online Resource
    Online Resource
    Biologische Untersuchungen zur Cephalopoden-Fauna vor Grönland (2007)
    Kiel
    Details Availability
    Keywords: Hochschulschrift ; Grönland ; Kopffüßer
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (116 Seiten = 21 MB) , Illustrationen, Graphen, Karten
    Edition: 2021
    URL: https://oceanrep.geomar.de/7386/
    Language: German
    Note: Zusammenfassung in deutscher und englischer Sprache
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    GEOMAR CATALOGUE
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    get availability status
  • 2
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    Eastern Baltic cod recruitment revisited—dynamics and impacting factors (2017)
    ICES
    In:  ICES Journal of Marine Science, 74 (1). pp. 3-19.
    Details
    Publication Date: 2020-02-06
    Description: The Eastern Baltic cod abundance started rapidly to increase in the mid-2000s as evidenced by analytical stock assessments, due to increased recruitment and declining fishing mortality. Since 2014, the analytical stock assessment is not available, leaving the present stock status unclear and casting doubts about the magnitude of the recent increase in recruitment. Earlier studies identified main factors impacting on cod reproductive success to be related to the loss of two out of three spawning areas in the 1980s caused by lack of major Baltic inflows with a concurrent reduction in salinity and oxygen. Other important factors include prey availability for first-feeding larvae, egg predation by sprat and herring and cannibalism on juveniles, all in one way or the other related to the prevailing hydrographic conditions. These factors cannot explain increased reproductive success in the last decade, as the period was characterized by an absence of large-scale Baltic inflows since 2003 and persistent anoxic conditions in the bottom water of the deep Baltic basins. This questions the perception of the increased recruitment in later years and challenges our present understanding of cod recruitment dynamics in the Baltic Sea. In this contribution, we review evidence from the recent literature supplemented by information from latest research cruises to elucidate whether cod reproductive success indeed has increased during the last decade, and we suggest the key processes responsible for the recent dynamics in cod recruitment and outline directions for future research.
    Type: Article , PeerReviewed
    Format: text
    Format: archive
    Format: image
    Format: image
    Format: text
    DOI: 10.1093/icesjms/fsw172
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Quantifying predation on Baltic cod early life stages (2017)
    NRC
    In:  Canadian Journal of Fisheries and Aquatic Sciences, 74 (6). pp. 833-842.
    Details
    Publication Date: 2020-02-06
    Description: Predation on cod eggs by sprat and herring is known to be one of the processes influencing reproductive success of the Eastern Baltic cod, and has been reported to have contributed to lack of recovery of the stock in the 1990s. This study quantifies the predation on cod eggs in the Bornholm Basin, the major spawning area of cod in the central Baltic Sea, in the 1990’s in comparison to the second half of the 2000s. The analyses involve estimating daily consumption rates of predator populations, which are then compared with corresponding daily egg production rates. As a methodological advancement compared to earlier studies, spatially resolved information on predator distribution and abundance is utilized in quantifying predator stock size. This resulted in more realistic consumption estimates in relation to overall egg production, compared to earlier studies that consistently overestimated predation pressure by clupeids. Our results suggest a generally lower predation pressure on cod eggs in the mid- to late-2000s, due to a combination of reduced predator abundance and lower daily rations by individual predators.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1139/cjfas-2016-0215
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Spatio-temporal overlap of the alien invasive ctenophore Mnemiopsis leidyi and ichthyoplankton in the Bornholm Basin (Baltic Sea) (2011)
    Springer
    In:  Biological Invasions, 13 (12). pp. 2647-2660.
    Details
    Publication Date: 2019-01-21
    Description: In 2007 the alien invasive ctenophore Mnemiopsis leidyi A. Agassiz 1865 was recorded for the first time in the Bornholm Basin, an area which serves as important spawning ground for Baltic fish stocks. Since M. leidyi is capable of preying upon early life stages of fish and further might act as food competitor for fish larvae, it is of major concern to investigate the potential threat that this non-indigenous species poses to the pelagic ecosystem of the Baltic Sea. The present study investigates the temporal and spatial overlap of M. leidyi with eggs and larvae of Baltic cod (Gadus morhua L.) and sprat (Sprattus sprattus L.) in order to assess the potential impact of this new invader on two of the most important Baltic fish stocks. Results show variable inter-seasonal distribution and overlap dynamics and thus different seasonal threat-scenarios for the early life stages of cod and sprat. The spatial overlap between M. leidyi and ichthyoplankton was low for most of the period observed, and we conclude that M. leidyi presently does not have a strong impact. However, we detected situations with high overlaps, e.g. for sprat larvae and cod eggs in spring. As the population dynamics of M. leidyi in the central Baltic are not yet fully understood, a future population explosion of the alien ctenophore with possible effects on fish recruitment cannot be ruled out. Furthermore, a possible shift in peak spawning of cod to the early season, when ctenophore abundances were relatively high, might increase the impact of M. leidyi on cod.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10530-011-9936-7
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Processes controlling recruitment in Baltic cod (2015)
    In:  [Talk] In: ICES Annual Science Conference 2015, 21.-25.09.2015, Copenhagen, Denmark .
    Details
    Publication Date: 2016-02-26
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 6
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    Baltic cod recruitment – the impact of changing environmental conditions (2016)
    In:  [Talk] In: 7. World Fisheries Congress, 23.-27.05.2016, Busan, Korea .
    Details
    Publication Date: 2016-06-14
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 7
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    Biologische Untersuchungen zur Cephalopoden-Fauna von Grönland (2007)
    In:  (Diploma thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 115 pp
    Details
    Publication Date: 2021-11-23
    Description: Between the years 2003 - 2006, a total of 247 cephalopod specimens were collected by means of bottom trawling from depths between O and 600 m in the waters around East-, South- and West Greenland. In addition to the known resident Arctic cephalopods Teuthowenia mega/ops, Cirroteuthis mulleri, the sepiolids Rossia moelleri, Rossia palpebrosa, Rossia megaptera, the boreoatlantic armhook squid Gonatus fabricii, the spoonarm octopus Bathypolypus bairdii, Bathypolypus arcticus and Bathypolypus pugniger, three species were reported in this area for the first time: Mastigoteuthis agassizi were encountered east, Todarodes sagittatus and Brachioteuthis riisei west of Greenland. The most abundant species was Rossia moelleri, followed by Gonatus fabricii and Bathypolypus bairdii. New information was gathered about horizontal and vertical distribution of the most common cephalopods, as well as data on their population structure and reproductive biology. Further, this study provides new relationships of beak size to mantle length and body mass for the most common species. Additional hydrographical measurements of ambient temperature and salinity above the bottom were sampled in these areas in order to discuss distributional characteristics of the newly found cephalopod species. This document also provides a maturity scale for the cephalopods Rossia and Bathypolypus, which are common in this area.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
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