Copper and zinc concentrations of the cosmopolitan green seaweeds Enteromorpha intestinalis and Ulva lactuca were obtained for the first time from various sites within Otago Harbour, southern New Zealand. Spatial variation in the concentrations of both metals was found, with increasing levels at stations in the upper harbour basin. While temporal fluctuations were apparent, a significant seasonal trend was evident only for zinc in U. lactuca; concentrations varied from approximately 10 μg g⁻¹ dry weight in winter to 2 μg g⁻¹ in summer. Over four consecutive years of sampling there was little change in metal concentrations of either species. Concentrations of both metals were invariably higher in E. intestinalis than U. lactuca, at all sampling stations and at all sampling times. These results are compared with those from other studies employing the same two green seaweed genera and are discussed in the context of the value of seaweeds as biomonitors of trace metal pollution. The levels of copper and zinc recorded in both species indicate that Otago Harbour is relatively free of trace metal contamination. This conclusion concurs with that reached in previous studies of dissolved copper and zinc concentrations in the surface waters of the harbour.

Item Type:	Refereed Article
Keywords:	heavy metal pollution, copper, zinc, green seaweed, macroalgae, New Zealand, biomonitoring
Research Division:	Biological Sciences
Research Group:	Ecology
Research Field:	Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:	Environment
Objective Group:	Ecosystem Assessment and Management
Objective Field:	Ecosystem Assessment and Management of Coastal and Estuarine Environments
Author:	Hurd, CL (Associate Professor Catriona Hurd)
ID Code:	93153
Year Published:	1999
Web of Science® Times Cited:	36
Deposited By:	IMAS Research and Education Centre
Deposited On:	2014-07-14
Last Modified:	2014-08-04
Downloads:	0