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Kilgour, B.W. and M.A. Baker, 1994. Effects of Season, Stock, and Laboratory Protocols on Survival of Zebra Mussels (Dreissena polymorpha) in Bioassays, Mackie & Associates Water Systems Analysts Inc. Reprinted from Archives of Environmental Contamination and Toxicology (1994) 27(1): 29-35 with kind permission from Springer Science and Business Media Effects of Season, Stock, and Laboratory Protocols on Survival of Zebra Mussels (Dreissena polymorpha) in BioassaysA series of experiments were conducted to determine the effects of
maintenance method (fed or starved), stock location, season, mussel size, and
rate of acclimation to temperature on the responses (mortality) of zebra mussels
in bioassays. Mussels maintained on a diet of crushed Chlorella are more
tolerant to Bayer 73® and more sensitive to sodium hypochlorite than
starved mussels. Variability in LC50s of zebra mussels is high during the first
Contact: B.W. Kilgour, Mackie & Associates Water Systems Analysts Inc., 23 Avra
Court, Guelph, Ontario N1H 7B2, Canada |
60
days in the laboratory, after which the resistance of mussels to both
hypochlorite and Bayer 73® declines with reductions in body
condition. Zebra mussels collected during the early summer and late fall are
more tolerant to both hypochlorite and Bayer 73®. There is
significant variation in tolerances to biocides depending on the stock, such
that stocks from locations with more degraded water quality have increased
tolerances. Acclimating mussels from 4 to 20°C at rates of 2 and 10°C d–1
does not significantly affect tolerance to biocides. In general, LC50s of
mussels vary by only 2–3×, suggesting that mussels from any location, any
season, and maintained under any maintenance protocol can be used in
range-finding
tests. Comparisons of results among studies requires knowledge of mussel stock,
collection season, and laboratory maintenance protocols.