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  • 1
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    Size structure and life cycle patterns of dominant pelagic amphipods collected as swimmers in sediment traps in the eastern Fram Strait (2012)
    Elsevier B.V.
    In:  EPIC3Journal of Marine Systems., Elsevier B.V., 95, pp. 1-15
    Details
    Publication Date: 2014-10-07
    Description: Time series length-frequency data are presented for Themisto amphipods collected as swimmers by moored sediment traps since 2000 at the AWI deep-sea observatory HAUSGARTEN (79°N/4°E) in the eastern Fram Strait. Amphipod occurrences increased significantly from 2000 to 2009 at 200-300 m depth, and the North Atlantic species Themisto compressa was continuously present in the samples starting in 2004. We present year-round records of large adult Themisto amphipods, including the appearance of T. libellula with a total body length of up to 56.7 mm and juveniles starting from 4.0 mm. The length of T. abyssorum ranged from 4.2-25.6 mm, whereas it varied for T. compressa from 8.8-24.4 mm. Length-frequency analysis indicated a life span of 2 years for T. abyssorum and at least 3 years for T. libellula. The absence of juveniles for T. compressa suggested its reproduction in southern subarctic areas and its occasional northward migration with warmer Atlantic water into the eastern Fram Strait. The seasonal and long-term size structure of the three pelagic species was consistent over the course of the study, indicating no changes occurred in cohort development due to increasing abundances or warming water temperatures.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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  • 2
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    First evidence of reproductive success in a southern invader indicates possible community shifts among Arctic zooplankton (2013)
    INTER-RESEARCH
    In:  EPIC3Marine Ecology-Progress Series, INTER-RESEARCH, 493, pp. 291-296, ISSN: 0171-8630
    Details
    Publication Date: 2014-09-17
    Description: Pelagic zooplankton were monitored from 2000 to 2012 at a permanent location near the Svalbard archipelago, at the boundary between the central Arctic Ocean and the Greenland Sea in the eastern Fram Strait. The temporal results reveal the first evidence of successful reproduc- tion in Arctic waters by an Atlantic pelagic crustacean from temperate waters. The Atlantic hyperid amphipod Themisto compressa is shown to have expanded its range from more southerly and warmer waters from 2004 onwards. Successful reproductive activity by T. compressa in Arctic waters was confirmed in 2011, indicated by the presence of a complete temporal series of develop- mental stages including ovigerous females and recently hatched juveniles. The Arctic amphipod community is currently in transition and a continuing northward spread of southern invaders could cause a biodiversity shift from large Arctic to smaller Atlantic species.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Location Call Number Limitation Availability
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    PAPER (OA)
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