Evaluating environmental drivers of Holocene changes in water chemistry and aquatic biota composition at Lake Loitsana, NE Finland

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Shala, ShyhreteStockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK) (author)

Evaluating environmental drivers of Holocene changes in water chemistry and aquatic biota composition at Lake Loitsana, NE Finland

Article/chapterEnglish2014

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2014-11-07
Springer Science and Business Media LLC,2014
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LIBRIS-ID:oai:DiVA.org:su-147281
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-147281URI
https://doi.org/10.1007/s10933-014-9795-1DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

This study presents a detailed analysis of geochemical and biotic proxies in a lake sediment profile to assess the effects of local and regional environmental drivers on the Holocene development of Lake Loitsana, situated in the northern boreal forest of NE Finland. Multi-proxy studies, in particular those that include a detailed plant macrofossil record, from the part of the northern boreal zone of Fennoscandia which has not been affected by treeline fluctuations, are scarce and few of these records date back to the earliest part of the Holocene. A 9-m sediment sequence of gyttja overlying silts representing the last c. 10,700 cal year, allowed for a high-resolution study with emphasis on the early to mid-Holocene lake history. The lacustrine sediments were studied using lithology, loss-on-ignition and C/N ratios, micro- and macro-fossils of aquatic and wetland taxa, diatoms, chironomids and accelerator mass spectrometry C-14 dating on terrestrial plant macrofossils. Our study shows that the local development at Loitsana was complex and included a distinct glacial lake phase and subsequent drainage, a history of fluvial input affected by nearby wetland expansion, and lake infilling in an eventual esker-fed shallow lake. Enhanced trophic conditions, due to morphometric eutrophication, are recorded as Glacial Lake Sokli drained and open water conditions became restricted to a relatively small Lake Loitsana depression. pH appears to have been stable throughout the Holocene with a well-buffered lake due to the local carbonatite bedrock (Sokli Carbonatite Massif). The fossil assemblage changes are best explained by a complex mixture of drivers, including water-body conditions (i.e. depth, turbidity and turbulence), rate of sediment input, and the general infilling of the lake, highlighting the need to carefully evaluate the possible influence of such local factors as palaeoenvironmental conditions are reconstructed based on aquatic proxies.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
Aquatic macrophytes
Chironomidae
Diatoms
Pollen
Sediment geochemistry
Local lake development
Holocene
Northern boreal zone
NE Finland

Added entries (persons, corporate bodies, meetings, titles ...)

Helmens, Karin F.Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)(Swepub:su)khelm (author)
Luoto, Tomi P. (author)
Väliranta, Minna (author)
Weckström, Jan (author)
Salonen, J. Sakari (author)
Kuhry, PeterStockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)(Swepub:su)pkuhr (author)
Stockholms universitetInstitutionen för naturgeografi och kvartärgeologi (INK) (creator_code:org_t)

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In:Journal of Paleolimnology: Springer Science and Business Media LLC52:4, s. 311-3290921-27281573-0417

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...

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