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Temporal and geographical genetic variation in the amphipod Melita plumulosa (Crustacea: Melitidae): Link of a localized change in haplotype frequencies to a chemical spill |
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| Authors: | Chung Pann Pann Hyne Ross V Mann Reinier M Ballard J William O |
| Affiliation: | a School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney 2052, Australia b Ecotoxicology and Environmental Contaminants Section, Centre for Ecotoxicology, NSW Department of Environment, Climate Change and Water, Lidcombe, NSW 1825, Australia c Centre for Ecotoxicology, Department of Environmental Sciences, University of Technology-Sydney, Broadway, NSW 2007, Australia d Evolution & Ecology Research Centre, University of New South Wales, Sydney 2052, Australia |
| Abstract: | Anthropogenic effects such as contamination affect the genetic structure of populations. This study examined the temporal and geographical patterns of genetic diversity among populations of the benthic crustacean amphipod Melita plumulosa in the Parramatta River (Sydney, Australia), following an industrial chemical spill. The spill of an acrylate/methacrylate co-polymer in naphtha solvent occurred in July 2006. M. plumulosa were sampled temporally between December 2006 and November 2009 and spatially in November 2009. Genetic variation was examined at the mitochondrial cytochrome c oxidase subunit I locus. Notably, nucleotide diversity was low and Tajima’s D was significantly negative amongst amphipods collected immediately downstream from the spill for 10 months. We hypothesize that the spill had a significant localized effect on the genetic diversity of M. plumulosa. Alternate explanations include an alternate and unknown toxicant or a localized sampling bias. Future proposed studies will dissect these alternatives. |
| Keywords: | Benthic amphipod Genetic variation COI Aromatic hydrocarbons Naphtha |
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