Comparing test systems to measure the salinity tolerance of freshwater invertebrates

Kefford, B, Palmer, C, Pakhomova, L and Nugegoda, D 2004, 'Comparing test systems to measure the salinity tolerance of freshwater invertebrates', Water SA, vol. 30, pp. 499-505.

Document type: Journal Article
Collection: Journal Articles

Title Comparing test systems to measure the salinity tolerance of freshwater invertebrates
Author(s) Kefford, B
Palmer, C
Pakhomova, L
Nugegoda, D
Year 2004
Journal name Water SA
Volume number 30
Start page 499
End page 505
Total pages 7
Publisher Water Research Commission
Abstract There have recently been several studies into acute salinity tolerance of freshwater invertebrates using different methods, making comparisons between studies difficult. The alternatives focus on experimental flow regimes and ionic proportions. In this study non-rheophilic riverine taxa collected in South Africa and south-east Australia were variously exposed to solutions of sodium chloride (NaCl) and the artificial sea salt, Ocean Nature, in flowing and still water. South African species: Euthraulus elegans (Ephemeroptera: Leptophlebiidae), Micronecta piccanina (Hempitera: Corixidae), Burnupia stenochorias (Gastropoda: Anyclidae), Micronecta annae (Gastropoda: Physidae). The main findings were: the slinity tolerances of a tange of taxa were not affected by flow regimes; taxa were less sensitive to the artificial sea salt than NaCl; there was, however, a direct relationship between the LC50 values from both salts. This relationship was used to compare the LC50 values from studies testing (artificial or natural) sea-water or NaCl; the comparison indicated variation in the mean LC50 between studies that is probably, at least in part, due to the range of taxonomic groups and rarities of species tested. When comparing the acute salinity tolerance of non-rheophilic invertebrates, the salt source and criteria affect the results, but the flow environment probably does not.
Subject Environmental Science and Management not elsewhere classified
Keyword(s) Stream invertebrates
acute salinity tolerance
test system
Copyright notice © 2004 Water Resource Commission
ISSN 0378-4738
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