期刊
FRESHWATER SCIENCE
卷 39, 期 4, 页码 824-836出版社
UNIV CHICAGO PRESS
DOI: 10.1086/711666
关键词
chloride; paleolimnology; salinity; sediments; Boreal Shield
资金
- Natural Sciences and Engineering Research Council (NSERC)
- Ontario Graduate Scholarship
Road-salt application is an integral part of winter road maintenance and safety in many cold regions. However, chloride (Cl-) runoff from salting activities may have adverse ecological effects. Lakes affected by road salt, particularly in urban areas, may have Cl(-)concentrations up to 300% higher than natural conditions. Zooplankton are sensitive to changes in water chemistry; however, little research has been conducted thus far into the biological effects of elevated Cl(-)concentrations from road-salt runoff. Using paleolimnological analyses, we studied the long-term effects of Cl(-)from road salt runoff on shallow, soft-water lakes within the southern Canadian Shield. Specifically, we examined Cladocera subfossils in dated sediment cores from 6 lakes within the Muskoka River Watershed of south-central Ontario, Canada. We compared long-term changes in cladoceran assemblages in the 5 lakes with the highest regional Cl(-)concentrations (32.8-90.9 mg/L) with a reference lake (0.91 mg/L). Prior to salting (ca. 1950), all of the lakes were dominated byBosminaspp., and cladoceran assemblages showed little variation over time. After salting began, species assemblages in the 5 impacted lakes showed distinct taxonomic shifts, including increases in relative abundances ofChydorus brevilabris(Frey,1980),Eurycercusspp., and theDaphnia pulexcomplex, and decreases in the relative abundance ofBosminaspp. andAlonaspp. In 2 of the lakes, these changes were distinct and coincided with the onset of salting activities. In contrast to the species changes observed in the affected lakes, we recorded minimal directional changes in cladoceran assemblages in the nearby reference site. Overall, biological changes in the impacted lakes were best explained by changing Cl(-)concentrations associated with road-salt application. Among lakes, the severity of impact may have been indirectly mediated by differences in food quantity through its effect on Cl(-)toxicity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据