Physical and biological variability in the Antarctic Polar Frontal Zone : report on research cruise 103 of the MV SA Agulhas

Froneman, P.W. and Ansorge, I.J. and Vumazonke, Lukhanyiso Unam. and Gulekana, A. and Bernard, K.S. and Webb, A.M. and Leukes, W. and Risien, C.M. and Thomalla, S. and Hermes, J. and Knott, M. and Anderson, D. and Hargey, N. and Jennings, M.E. and Veitch, J. and Lutjeharms, J.R.E. and McQuaid, C.D. (2002) Physical and biological variability in the Antarctic Polar Frontal Zone : report on research cruise 103 of the MV SA Agulhas. South African Journal of Science, 98 (11&12). pp. 534-536. ISSN 0038-2353

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Abstract

A detailed hydrographic and biological survey was carried out in the region of the South-west Indian Ridge during April 2002. Hydrographic data revealed that the Andrew Bain Fracture Zone, centred at 30oE, 50oS, functions as an important choke point to the flow of the Antarctic Circumpolar Current, resulting in the convergence of the Antarctic Polar Front (APF) and the southern branch of the Sub-Antarctic Front (SSAF). Total chlorophyll-a concentration and zooplankton biomass were highest at stations occupied in the vicinity of two frontal features represented by the APF and SSAF. These data suggest that the region of the South-west Indian Ridge is an area of elevated biological activity and probably acts as an important offshore feeding area for the top predators on the Prince Edward Islands.

Item Type:Article
Additional Information:News & Views
Uncontrolled Keywords:biological survey; biomass; chlorophyll-a; hydrographic survey; polar front; zooplankton; South-west Indian Ridge; Indian Ocean; Antarctic Polar Frontal Zone; Andrew Bain Fracture Zone; Antarctic Circumpolar Current; Prince Edward Islands; predators; MV SA Agulhas
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Pharmacy
Faculty > Faculty of Science > Biochemistry, Microbiology & Biotechnology
Faculty > Faculty of Science > Zoology & Entomology
Research Institutes and Units > South African Institute for Aquatic Biodiversity (SAIAB)
Research Institutes and Units > Southern Ocean Group
ID Code:341
Deposited By: Mrs Eileen Shepherd
Deposited On:11 Oct 2006
Last Modified:01 Aug 2012 13:11
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