Shell growth response of mussels (Mytilus edulis) exposed to toxic microalgae |
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Authors: | M V Nielsen T Strømgren |
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Institution: | (1) Trondheim Biological Station, N-7004 Trondheim, Norway;(2) University of Trondheim, The Museum, N-7004 Trondheim, Norway |
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Abstract: | Mussels (Mytilus edulis) were exposed to the algaeAlexandrium ostenfeldii, Chrysochromulina polylepis, Gyrodinium aureolum, Gymnodinium galatheanum andHeterosigma akashiwo for 24 h; significant reductions in growth rate, as compared to the control, were observed after exposure toA. ostenfeldii, C. polylepis, G. aureolum andG. galatheanum at initial concentrations of 4.5 × 106, 110 × 106, 9 × 106 and 120 × 106 cells l–1, respectively. Exposure to high initial concentrations of the non-toxic algaeTetraselmis suecica (174 × 106 cells l–1) andIsochrysis galbana (610 × 106 cells l–1) showed no adverse effect on growth rate. When mussels with reduced growth were transferred to clean seawater, they recovered to > 90% of control growth within 2 to 4 d. Exposure to algal filtrates of the toxic algal cultures produced no reduction in growth rate. |
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