Impact of municipal effluents and hydrological regime on myxozoan parasite communities of fish

Impact of municipal effluents and hydrological regime on myxozoan parasite communities of fishIncreased productivity from sewage effluents can enhance species richness locally. Results from a study of Spottail shiners (Notropis hudsonius) in 1999 showed that prevalence and the mean number of myxozoan parasite species per host were higher downstream of the wastewater outflow from the Island of Montreal than upstream in the St. Lawrence River, Quebec, Canada. This was attributed to organic enrichment of the sediments which presumably lead to increased densities of oligochaetes, the alternate hosts, downstream of Montreal. Spottail shiners subsequently were collected every August\/early September in 2001–2004 to examine the stability and repeatability of these patterns. Results suggest that on a local scale, variations in prevalence and diversity among localities are influenced by municipal effluents, but that at a landscape scale annual variations across sites are affected by the hydrological regime and climate. In effect, water level fluctuation had a landscape-wide impact that was superimposed over pollution-induced local variations.

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Scientific Publication - Impact of municipal effluents and hydrological regime on myxozoan parasite communities of fish
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