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JOURNAL OF PLANKTON RESEARCH | VOLUME 11 | NUMBER 4 | PAGES 711-728 | 1989
© Oxford University Press

research-article

The distribution of hyperiid amphipods (Crustacea:Peracarida) in relation to warm-core eddy J in the Tasman Sea

J.W. Young

CSIRO Division of Fisheries GPO Box 1538, Hobart 7001, Tasmania

Received on August 1, 1988; accepted on February 24, 1989 Hyperiid amphipods were sampled in and around warm-core eddy J in the Tasman Sea off eastern Australia in August, September and October 1979. Samples were taken at night to a depth of 400 m with a midwater trawl (RMT-8). In all, 22 798 hyperiids representing 38 species and 10 families were collected. Seven species, individually found in numbers >4% of the total amphipod population, together contributed 87.1% to the total. Of these, Scina crassicornis, Phronima sedensataria, P.atlantica, Phrosina semilunata, Primno johnsoni and Brachyscelus crusculum were usually found in highest numbers outside the eddy. Streetsia challengeri was the only abundant species with significantly higher numbers inside the eddy. Outside the eddy, samples were characterized by large numbers of few species, whereas abundances were more evenly distributed between species inside the eddy. The size distributions of two abundant species (B.crusculum and S.challengeri) were not significantly different between the inside and outside of eddy J. Hyperiid faunal patterns were associated with depth and temperature (August), position with respect to the eddy (September, October) and the presence of gelatinous zooplankton (September, October).


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