Diatom responses to 20th century climate-related environmental changes in high-elevation mountain lakes of the northern Canadian Cordillera

Karst-Riddoch, Tammy L.; Pisaric, Michael F. J.; Smol, John P.

doi:10.1007/s10933-004-5334-9

Cited by 82 publications

(49 citation statements)

References 66 publications

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“…These fi ndings are especially important for lake management strategies because of the individualistic responses and differing sensitivities of Arctic and alpine lakes to climatic and environmental change (Anderson et al 2004, Karst-Riddoch et al 2005b. Therefore, Icelandic lakes that are limnologically and ecologically similar (with the same ecological TYPE category) are more likely to respond in a comparable way to climate change.…”

Section: Discussionmentioning

confidence: 99%

Relationships between freshwater sedimentary diatoms and environmental variables in Subarctic Icelandic lakes

Karst-Riddoch¹,

Malmquist²,

Smol³

2009

fal

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Abstract:The distribution patterns of surface sediment diatom assemblages from 49 lakes were used to explore the relationship between limnological variables and diatom assemblages as well as to assess an ecological classifi cation system as a tool for the management and conservation of Icelandic freshwaters. Lakes were limnologically diverse ranging from deep, oligotrophic, ionically dilute lakes, to shallow lakes with a wide range of nutrient and ionic contents. Physical conditions (depth, surface area, surface water temperature) and nutrient and ion concentrations differed signifi cantly among ecological lake categories (i.e., plateau, spring-fed, direct-runoff, valley, glacial, and coastal lakes) (ANOVA, p < 0.05). Diatom assemblages were taxonomically diverse (329 taxa) with strong representation of planktonic, benthic and periphytic forms. Small benthic Fragilaria sensu lato (19 species and varieties) were the most abundant with combined abundances > 20 % in all but 4 of the lakes, most likely due to the generally cold lake water conditions in this subarctic region. Variation in diatom distributions was best explained by the combination of mean depth (infl uencing littoral versus planktonic habitats), surface water temperature, specifi c conductivity, alkalinity, total organic carbon, total nitrogen and SiO 2 in a canonical correspondence analysis (CCA). However, these variables did not explain distribution patterns amongst small benthic Fragilaria taxa, although some weak relationships between some taxa and these variables were evident. Distinct diatom assemblages and limnological properties among ecological lake categories support the classifi cation of Icelandic freshwaters based on major topographic, geological and hydrological characteristics. More detailed inclusion of lake depth along with lake basin form, as well as more refi ned categories of lake water origin and topographical positioning to better approximate regional climatic conditions, may improve the ecological classifi cation of Icelandic freshwaters for conservation and management practices.

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Section: Discussionmentioning

confidence: 99%

Relationships between freshwater sedimentary diatoms and environmental variables in Subarctic Icelandic lakes

Karst-Riddoch¹,

Malmquist²,

Smol³

2009

fal

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“…Throughout their histories, all three lakes have lacked a significant planktonic community and have been dominated by small benthic alkaliphilic species of the Fragilariaceae family commonly found in alpine (Lotter et al 1997;Karst-Riddoch et al 2005) and arctic lakes (Douglas and Smol 1999;Laing and Smol 2000).…”

Section: Discussionmentioning

confidence: 99%

Diatom Paleolimnological Record of Holocene Climatic and Environmental Change in the Altai Mountains, Siberia

et al. 2006

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“…Many lakes and rivers have increased concentrations of sulphates, base cations and silica, and greater alkalinity and conductivity related to increased weathering of silicates, calcium and magnesium sulphates, or carbonates, in their catchment. In contrast, when warmer temperatures enhanced vegetative growth and soil development in some high-alpine ecosystems, alkalinity decreased because of increased organic acid inputs (Karst-Riddoch et al, 2005). Glacial melting increased the input of organochlorines (which had been atmospherically transported to and stored in the glacier) to a sub-alpine lake in Canada (Blais et al, 2001).…”

Section: Chemistrymentioning

confidence: 99%

Resistance and Resilience of A Stream Salamander To Supraseasonal Drought

2012

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Diatom responses to 20th century climate-related environmental changes in high-elevation mountain lakes of the northern Canadian Cordillera

Cited by 82 publications

References 66 publications

Relationships between freshwater sedimentary diatoms and environmental variables in Subarctic Icelandic lakes

Relationships between freshwater sedimentary diatoms and environmental variables in Subarctic Icelandic lakes

Diatom Paleolimnological Record of Holocene Climatic and Environmental Change in the Altai Mountains, Siberia

Resistance and Resilience of A Stream Salamander To Supraseasonal Drought

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