Journal article
Is salt the solution? Interactions between trace-metal uptake and salinity in the freshwater crab Potamonautes warreni Calman, 1918 (Decapoda: Brachyura: Potamonautidae)
Journal of Crustacean Biology, Vol.43(1), pp.1-9
2023
Abstract
Crustaceans inhabiting freshwater are more vulnerable to increased loading with dissolved trace metals than those from more saline conditions for both physicochemical and physiological reasons. Potamonautes warreni () is a true freshwater crab inhabiting rivers in proximity to mining activities in South Africa. In order to assess whether the uptake of zinc (Zn2+) and cadmium (Cd2+) were associated with Na+- and Ca2+-uptake routes, individuals of P. warreni were acclimated to different Na+ or Ca2+ concentrations before measuring trace-metal uptake into the haemolymph and tissues in an intermediate freshwater. Cd2+ uptake into the haemolymph was elevated following acclimation to 'Na+ replete' conditions, when compared with 'Na+ deplete' conditions, indicating that a physiological response to the acclimation salinity had influenced Cd2+ uptake. Zn2+ uptake by the whole body was elevated in P. warreni individuals from the 'Na+ replete' group when compared with crabs acclimated to Na+ free water. A general change in permeability may have occurred and indeed, the apparent water permeability (water efflux) of P. warreni was increased in elevated Na+ and Ca2+ concentrations compared with that in softer water. A comparison of the osmoregulatory ability between P. warreni and the catadromous crab Eriocheir sinensis highlighted the greater permeability of the latter. Lower Zn2+ and Cd2+ uptake rates were measured in P. warreni in comparison to those measured in E. sinensis by other authors, indicating that the more well adapted a species is to life in freshwater, the less susceptible they will be to metal uptake. Future investigations to understand further the mechanisms influencing Zn2+ and Cd2+ uptake are required to understand the role that salinity can play in protecting a species from trace-metals released into the environment.
Details
- Title
- Is salt the solution? Interactions between trace-metal uptake and salinity in the freshwater crab Potamonautes warreni Calman, 1918 (Decapoda: Brachyura: Potamonautidae)
- Authors
- Susan K. Glendinning (Corresponding Author) - University of BristolAndre Vosloo (Author) - North-West University
- Publication details
- Journal of Crustacean Biology, Vol.43(1), pp.1-9
- Publisher
- Oxford University Press
- DOI
- 10.1093/jcbiol/ruad010
- ISSN
- 1937-240X
- Organisation Unit
- Centre for Bioinnovation; School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99718256302621
- Output Type
- Journal article
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- Marine & Freshwater Biology
- Zoology
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