Bradford & Chapman--<i>Nyctiphanes australis</i> in Cook Strait

New Zealand Journal of Marine and Freshwater Research abstracts

Nyctiphanes australis (Euphausiacea) and an upwelling plume in western Cook Strait, New Zealand

JANET M. BRADFORD BRUCE CHAPMAN

Division of Marine and Freshwater Science Department of Scientific and Industrial Research Private Bag, Kilbirnie, Wellington, New Zealand

Abstract Quantitative data are presented on the distribution of adult and larval stages of the euphausiid Nyctiphanes australis G. O. Sars, in western Cook Strait, New Zealand, an area influenced by an upwelling plume. The behaviour of N. australis in the Kahurangi Point region at different stages of its life history appears to ensure its maintenance, in general, over the continental shelf on an upwelling coast. Population structure at the source of the upwelling near Kahurangi Point differed from that in regions "down stream" from the plume. Nyctiphanes australis was most abundant at the "downstream" eastern end of the upwelling plume, and the evidence suggesting that the dense populations there may be resident is discussed. Possible reasons for low densities of furcilia II and III stages in the eastern plume region are considered.

Keywords Nyctiphanes australis; Euphausiacea; upwelling plume; Cook Strait; New Zealand Received 9 June 1987; accepted 24 September 1987

PDF file of entire paper: medium quality (860K); (scanned from paper original: notes about this process)

This year's abstracts | Journal home page | All abstracts | Publishing home page