Comparing long-term changes in cladoceran and diatom assemblages from a lake impacted by road salt seepage to a nearby reference lake near Toronto (Ontario, Canada)

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
R. E. Valleau, K. G. Murray, A. M. Paterson, J. P. Smol
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Abstract

Urban and peri-urban lakes experience a wider array of environmental stressors, and often at a higher intensity, than their rural counterparts, including road salt runoff. A paleolimnological approach was used to determine pre-disturbance limnological conditions and to evaluate the impact of environmental stressors (nutrient inputs, climate change, and winter de-icing salt) on the long-term (~ 150 years) water quality of a small urban kettle lake in the Oak Ridges Moraine near Toronto, Ontario, Canada. Specifically, we examined Cladocera and diatom subfossils in 210Pb-dated sediment cores from a lake with elevated measured chloride concentrations, Haynes Lake (Cl = 201 mg/l), and a nearby reference lake located in a conservation area (Swan Lake, Cl = 28 mg/l). In Haynes Lake, Cladocera compositional change is consistent with increasing Cl concentrations, showing a shift from a Bosmina spp.-dominated cladoceran assemblage to a Daphnia spp.-dominated assemblage. Concurrently, we recorded increases in the relative abundances of the diatom taxon Achnanthidium minutissimum and benthic fragilarioid taxa. These biological changes coincided closely with the onset of road salting in the region (ca. 1940s). The reference site (Swan Lake), located ~ 1 km from our salt-impacted site, displayed only minimal changes in both Cladocera and diatom assemblages, suggesting road development and salting within the Haynes Lake watershed had a larger impact than regional stressors (i.e., climate).

Abstract Image

比较多伦多(加拿大安大略省)附近一个受路面盐渗漏影响的湖泊与附近一个参照湖泊中底栖动物和硅藻群的长期变化
与农村湖泊相比,城市和城郊湖泊面临的环境压力更多,强度也更高,其中包括路面盐径流。我们采用古生态学方法来确定干扰前的湖泊状况,并评估环境压力因素(营养物质输入、气候变化和冬季除冰盐)对加拿大安大略省多伦多市附近橡树岭碛的一个小型城市水壶湖长期(约 150 年)水质的影响。具体而言,我们研究了来自一个测量氯化物浓度较高的湖泊--海恩斯湖(Cl- = 201 mg/l)和附近一个位于保护区的参考湖泊(天鹅湖,Cl- = 28 mg/l)的 210Pb 日期沉积物岩心中的桡足类和硅藻亚化石。在海恩斯湖,桡足类组成的变化与 Cl- 浓度的增加一致,显示出从以 Bosmina spp.为主的桡足类组合向以 Daphnia spp.为主的组合转变。与此同时,我们还记录到硅藻类群 Achnanthidium minutissimum 和底栖纤毛虫类群的相对丰度增加。这些生物变化与该地区开始撒盐(约 20 世纪 40 年代)密切相关。参考地点(天鹅湖)距离我们受盐影响的地点约 1 公里,其 Cladocera 和硅藻群的变化都很小,这表明海恩斯湖流域的道路开发和撒盐比区域压力因素(即气候)的影响更大。
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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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