Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||The effect of parasitism by a blood-feeding isopod on the otolith chemistry of host fish|
|Citation:||Marine and Freshwater Research, 2013; 64(1):10-19|
|Publisher:||C S I R O Publishing|
|Elizabeth C. Heagney, Bronwyn M. Gillanders and Iain M. Suthers|
|Abstract:||Otolith chemistry is widely used to discriminate fish stocks or populations, although many of the factors that determine trace-element concentrations within the otolith remain poorly understood. We investigated the effect of a blood-feeding isopod ectoparasite, Ceratothoa sp., on the otolith chemistry of yellowtail scad, Trachurus novaezelandiae. We sampled 65 fish from three subpopulations of T. novaezelandiae from Jervis Bay in south-eastern Australia, and used laser ablation (LA)–inductivelycoupled plasma mass spectrometry (ICPMS) to measure otolith lithium (Li) calcium (Ca), magnesium (Mg) Ca, strontium (Sr) Ca and barium (Ba) Ca from four consecutive summer and winter growth bands. Otoliths of parasitised fish were characterised by significantly lower Li Ca and Mg Ca, and higher Sr Ca, than those of unparasitised individuals from the same subpopulation. The consistency of trends in otolith chemistry across ablation points and among subpopulations suggests that there is a consistent physiological mechanism through which Ceratothoa parasites affect the otolith chemistry of infected individuals. It is likely that a range of physical, metabolic, chemical and behavioural processes act in concert to influence the otolith chemistry of parasitised fish. Given the ubiquitous distribution of parasites in the marine environment, differential rates of parasitism among fish stocks, populations or migratory contingents may be an important but unappreciated factor driving stock- or population-based differences in otolith chemistry.|
|Keywords:||Carangidae; Cymothoidae; ectoparasite; tongue biter|
|Rights:||Journal compilation © CSIRO 2013|
|Appears in Collections:||Earth and Environmental Sciences publications|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.