Inter-specific variations in distribution, abundance and possible life-cycle patterns of Themisto spp. (Amphipoda) in the Barents Sea

摘要: Amphipods from the central and northern areas of Barents Sea were studied by a series MOCNESS profiles between 1990 1997. Themisto abyssorum, though dominant in warmer Atlantic water, was also present Arctic water. In contrast, T. libellula typical species penetrated very little into water masses. compressa seldom found area. Linear regression analysis showed statistically significant negative relationship abundance variability inflow. The this seems to be, large extent, determined amount Sea. sub-Arctic species, only has 1-year life-cycle, with peak release young (2–3 mm) occurring May June. A few individuals may survive be older. libellula, earlier length-frequency distributions seem indicate 2-year life-span. spring phytoplankton, which usually blooms during April Sea, followed high Calanus spp. krill are regarded as important factors that influence amphipods' young.