Dominant pelagic amphipods collected as swimmers from a mooring time-series at AWI HAUSGARTEN ...

• Main Authors: Kraft, Angelina, Bauerfeind, Eduard, Nöthig, Eva-Maria, Bathmann, Ulrich
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Fram Strait; North Atlantic; Subarctic; Themisto abyssorum; Themisto libellula
• Online Access: https://dx.doi.org/10.1594/pangaea.809084; https://doi.pangaea.de/10.1594/PANGAEA.809084

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 Themisto libellula with a total body length of up to 56.7 mm and juveniles starting from 4.0 mm. The length of Themisto abyssorum ranged from 4.2 to 25.6 mm, whereas it varied for Themisto compressa from 8.8 to 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. ... : Supplement to: Kraft, Angelina; Bauerfeind, Eduard; Nöthig, Eva-Maria; Bathmann, Ulrich (2012): Size structure and life cycle patterns of dominant pelagic amphipods collected as swimmers in sediment traps in the eastern Fram Strait. Journal of Marine Systems, 95, 1-15 ...