Warm season chloride concentrations in stream habitats of freshwater mussel species at risk

Todd, Aaron K.; Kaltenecker, M Georgina

Warm season chloride concentrations in stream habitats of freshwater mussel species at risk

2012

Todd, Aaron K. | Kaltenecker, M Georgina

Warm season (May–October) chloride concentrations were assessed in stream habitats of freshwater mussel species at risk in southern Ontario, Canada. Significant increases in concentrations were observed at 96% of 24 long-term (1975–2009) monitoring sites. Concentrations were described as a function of road density indicating an anthropogenic source of chloride. Linear regression showed that 36% of the variation of concentrations was explained by road salt use by the provincial transportation ministry. Results suggest that long-term road salt use and retention is contributing to a gradual increase in baseline chloride concentrations in at risk mussel habitats. Exposure of sensitive mussel larvae (glochidia) to increasing chloride concentrations may affect recruitment to at risk mussel populations.

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