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Type: Journal article
Title: Osmoregulation in populations of an endangered hardyhead (Atherinidae: Craterocephalus fluviatilis McCulloch, 1912) from different salinity regimes
Author: Wedderburn, S.
Walker, K.
Citation: Ecology of Freshwater Fish, 2008; 17(4):653-658
Publisher: Munksgaard Int Publ Ltd
Issue Date: 2008
ISSN: 0906-6691
Statement of
S. D. Wedderburn and K. F. Walker
Abstract: Fragmented populations of freshwater fish may develop genotypic and phenotypic differences as adaptations to local habitat conditions. These differences contribute significantly to biological diversity and may lead to speciation. In the Murray–Darling Basin, Australia, the Murray hardyhead Craterocephalus fluviatilis, listed as 'endangered' by the World Conservation Union, has a wide but fragmented distribution that is apparently related to salinity. To determine whether this pattern has a physiological basis, we compared osmoregulation in fish from two isolated populations in different salinity regimes (Wyndgate: 0.4–1.5‰; Disher Creek: c. 1.0–45‰). In laboratory trials, fish from both populations remained healthy at high salinities (5–65‰). The Disher Creek population maintained a significantly lower blood osmotic concentration than the Wyndgate population at salinities ≤1‰, suggesting that there is a physiological difference between them. The findings have implications for the conservation of C. fluviatilis and other fish populations whose distributions are fragmented by salinity.
Keywords: fragmentation
Craterocephalus fluviatilis
Murray–Darling Basin
DOI: 10.1111/j.1600-0633.2008.00316.x
Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications
Environment Institute publications

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