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RESEARCH ARTICLE
Contents Vol 56(1)

The partitioning of zinc, manganese, cadmium and selenium within copepods in oceanic waters east of New Zealand

Douglas S. Mackie A B and Keith A. Hunter A
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- Author Affiliations

A Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand.

B Corresponding author. Email: dmackie@alkali.otago.ac.nz

Marine and Freshwater Research 56(1) 95-100 https://doi.org/10.1071/MF04194
Submitted: 15 July 2004  Accepted: 15 December 2004   Published: 4 February 2005

Abstract

The partitioning of Zn, Mn, Cd and Se within mesozooplankton, mainly calanoid copepods, is reported for two geographically close but biogeochemically distinct water masses (subtropical (ST) and subantarctic (SA) waters) during a transect east of New Zealand in austral spring 1997. Particular attention was paid to avoiding sample contamination during collection, handling and chemical analysis by using trace metal clean techniques. Mesozooplankton underwent a sequential chemical leaching scheme to determine the degree and type of elemental associations within labile and refractory tissues. All four elements showed a positive correlation with the phosphorus content of each fraction indicating a consistent relationship to the amount of tissue dissolved in each fraction. Ratios of Cd : P and Zn : P in samples from SA waters were over twice those in ST waters. However, no significant differences were found between Mn : P and Se : P ratios for samples from the two water masses.

Extra keywords: subtropical convergence, trace elements, trophodynamics, zooplankton.


Acknowledgments

D. Mackie received financial support from the New Zealand Vice Chancellors Committee and the Department of Chemistry, University of Otago. The National Institute of Water and Atmospheric Research (NIWA) generously provided facilities for D. Mackie aboard the RV Tangaroa. J. Bradford-Grieve identified the copepods. The manuscript was greatly improved through the observations and comments of D. Hutchins.


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