Abstract
1) Heart rates and midgut gland wet weight dry weight ( WW DW ) ratios of rock crabs ( Hemigrapsus edwardsi) were measured in individuals collected along a contaminant gradient in Otago Harbour, New Zealand. 2) Median heart rates decreased by 15–20% while midgut gland WW DW ratios increased by 25–30% with increasing contamination of field sites. 3) Intra- and inter-individual variability in heart rate increased markedly at the most severely contaminated sites, as did inter-individual variability in midgut gland WW DW ratio. 4) The findings are discussed in the context of the use of the biomarker approach to address ecotoxicological problems.
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