Journal ArticleDOI
Applications of freshwater diatoms to geographical research
TLDR
A review of palaeo-ecological reconstructions that are based on freshwater diatoms is presented in this article, focusing on palaeoencology, hydrology, geomorphology, bio geography, and water quality assessment and monitoring.Abstract:
Diatoms (Bacillariophyceae) are a widely distributed group of microscopic, unicellular algae that are characterized by siliceous cell walls (frustules). The size, shape and sculpturing of diatom frustules are taxonomically diagnostic. Moreover, because of their siliceous composition, diatoms are often well preserved in stratigraphic deposits, where they can be used to infer (quantitatively or qualitatively) past environmental conditions. The sensitivity of diatoms to a wide variety of environmental variables provides geographers with a multitude of research opportunities. This review focuses on palaeoecological reconstructions that are based on freshwater diatoms. Geographical applications including studies of climatology, hydrology, geomorphology, bio geography, and water-quality assessment and monitoring are discussed.read more
Citations
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Diatoms as quantitative indicators of pH and water temperature in subarctic Fennoscandian lakes
TL;DR: Weighted averaging regression and calibration-based optima and tolerances of lakewater pH and temperature are presented for diatoms in ecologically sensitive, subarctic Fennoscandian lakes.
Journal ArticleDOI
The use and application of freshwater midges (Chironomidae: Insecta: Diptera) in geographical research
TL;DR: The potential of applying the analysis of freshwater midges (Chironomidae) for current questions in geographical research is examined and the current status of chironomid research in academic geography is discussed and suggestions of potential future research directions are made.
Journal ArticleDOI
Patterns in the distribution, composition and diversity of diatom assemblages in relation to ecoclimatic factors in Arctic Lapland
Jan Weckström,Atte Korhola +1 more
TL;DR: In this article, the relationship between diatom distribution, composition, species richness and environmental variables in lakes in Arctic Lapland were explored with particular attention to temperature and other climate-related factors in ecotonal waters.
Journal ArticleDOI
Holocene vegetational and limnological changes in the Fennoscandian tree-line area as documented by pollen and diatom records from Lake Tsuolbmajavri, Finland
Heikki Seppä,Jan Weckström +1 more
TL;DR: Holocene vegetational and limnological changes in the Fennoscandian tree-line area as documented by pollen and diatom records from Lake Tsuolbmajavri, Finland as discussed by the authors.
Journal ArticleDOI
Recent diatom assemblage changes in subarctic Lake Saanajärvi, NW Finnish Lapland, and their paleoenvironmental implications
Sanna Sorvari,Atte Korhola +1 more
TL;DR: In this paper, a 30-cm long sediment core obtained from remote subarctic Lake Saanaarvi (69°03′N, 20°52′E) was analyzed to trace possible changes in the lake.
References
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Climatic changes of the last 18,000 years: observations and model simulations
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Journal ArticleDOI
The Influence of Changing Orbital Parameters and Surface Boundary Conditions on Climate Simulations for the Past 18 000 Years
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Journal ArticleDOI
Diatoms and pH Reconstruction
TL;DR: Reconstruction of past lake-water pH from diatom data involves two steps; regression, where responses of modern diatom abundances to pH are modelled and calibration, where the modelled responses are used to infer pH fromdiatom assemblages preserved in lake sediments.
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