New Zealand Journal of Marine and Freshwater Research abstracts

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Iron and zinc content of Hormosira banksii in New Zealand

R. R. M. Cooke
C. L. Hurd†
J. M. Lord

Department of Botany
University of Otago
P.O. Box 56
Dunedin, New Zealand
email: catriona.hurd@botany.otago.ac.nz

B. M. Peake

Department of Chemistry
University of Otago
P.O. Box 56
Dunedin, New Zealand

J. A. Raven

Division of Environmental and Applied Biology
School of Life Sciences
University of Dundee
Biological Sciences Institute
Dundee, DD1 4HN, Scotland

T. A. V. Rees

Leigh Marine Laboratory
University of Auckland
P.O. Box 349
Warkworth, New Zealand

†Author for correspondence.

Abstract  In the Northern Hemisphere, brown seaweeds in the Order Fucales have been used extensively as bio-monitors of heavy metal contamination in sea water, but in New Zealand there has been no assessment of the suitability of the Fucales in this role. We measured iron (Fe) and zinc (Zn) concentrations in the intertidal fucalean seaweed Hormosira banksiiat three sites in Otago, south-eastern New Zealand and two sites at Leigh, north-eastern New Zealand. There was no evidence of Zn or Fe contamination at any site studied. Zn levels for H. banksii from Otago Harbour followed a trend similar to an earlier study of Ulva sp. and the Fe content reflected patterns previously observed in sea water. Thus, as for Northern Hemisphere fucalean seaweeds, H. banksii is potentially useful as a bio-monitor for heavy metals in sea water. Levels of Fe and Zn were among the lowest of any brown seaweed worldwide, and the Fe content of H. banksii from Waterfall Reef, Goat Island Marine Reserve, Leigh, was 50% lower than samples from Otago. These low trace metal levels led us to examine if the growth of H. banksii in New Zealand is limited by Fe or Zn. The physiological requirements of Fe and Zn for growth were calculated and compared with measured values and we suggest that despite low Zn and Fe levels, these trace elements do not limit the growth of H. banksii.

Keywords  bio-monitor; Hormosira banksii; Fe; Zn; New Zealand; seaweed; trace metal

M03011; Online publication date 15 March 2004; Received 20 February 2003; accepted 24 December 2003
New Zealand Journal of Marine and Freshwater Research, 2004, Vol. 38: 73-85
0028-8330/04/3801-0073 © The Royal Society of New Zealand 2004

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