Abstract
Toxicities recorded from 1944 to 1958 in blue mussels (Mytilus edulis) from Head Harbour, N.B., are examined in relation to some hydrographic and meteorological factors. Within-year variations in toxicity are correlated with summer rises in water temperature. Year-to-year variations are directly correlated with springtime insolation and salinity and inversely correlated with springtime river discharge and winter water temperature. The probable role of these factors in regulating the abundance of the causative organism, hence, levels of toxicity, is discussed.

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