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

Westover, Karlyn S.; Fritz, Sherilyn C.; Blyakharchuk, Tatyana A; Wright, H. E.

doi:10.1007/s10933-005-3241-3

Cited by 40 publications

(15 citation statements)

References 52 publications

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“…Temperature was previously found to affect Arctic diatom communities (Hobbs et al 2010;Laing et al 1999). A few studies report slight shifts in the distribution of diatoms with changes in climate over different time scales, but also reveal the continuous presence of Staurosira and Staurosirella over long periods (Biskaborn et al 2012;Westover et al 2006). The distribution of Staurosira and Staurosirella haplotypes in our study might be driven by some of these environmental factors, but further investigations into these factors are needed, as is broader geographic sampling, to address this question.…”

Section: Usability Of Sedimentary Dna For Diatom Identification In Pamentioning

confidence: 64%

A combined paleolimnological/genetic analysis of diatoms reveals divergent evolutionary lineages of Staurosira and Staurosirella (Bacillariophyta) in Siberian lake sediments along a latitudinal transect

et al. 2014

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Diatom diversity in lakes of northwest Yakutia (Siberia) was investigated by microscopic and genetic analysis of surface and cored lake sediments, to evaluate the use of sedimentary DNA for paleolimnological diatom studies and to identify obscure genetic diversity that cannot be detected by microscopic methods. Two short (76 and 73 bp) and one longer (577 bp) fragments of the ribulose 1,5-bisphosphate carboxylase/oxygenase (rbcL) gene, encoding the large subunit of the rbcL, were used as genetic markers. Diverse morphological assemblages of diatoms, dominated by small benthic fragilarioid taxa, were retrieved from the sediments of each lake. These minute fragilarioid taxa were examined by scanning electron microscopy, revealing diverse morphotypes in Staurosira and Staurosirella from the different lakes. Genetic analyses indicated a dominance of haplotypes that were assigned to fragilarioid taxa and less genetic diversity in other diatom taxa. The long rbcL_577 amplicon identified considerable diversification among haplotypes clustering within the Staurosira/Staurosirella genera, revealing 19 different haplotypes whose spatial distribution appears to be primarily related to the latitude of the lakes, which corresponds to a vegetation and climate gradient. Our rbcL markers are valuable tools Electronic supplementary material The online version of this article

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Section: Usability Of Sedimentary Dna For Diatom Identification In Pamentioning

confidence: 64%

A combined paleolimnological/genetic analysis of diatoms reveals divergent evolutionary lineages of Staurosira and Staurosirella (Bacillariophyta) in Siberian lake sediments along a latitudinal transect

et al. 2014

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“…6f) show the humidity/ precipitation pattern, which makes it similar to the ER before 6 kyr BP and to the WR after that. Ilyashuk and Ilyashuk (2007), using chironomid and lithology records and results of the diatom analysis (Westover et al, 2006), suggested that the Pacific monsoon brought precipitation to the Russian Altai in the early Holocene, whereas cyclones associated with the Atlantic westerlies were likely responsible for the moisture transport during the second half of the Holocene. The reconstructed mid-Holocene phase of relatively dry climatic conditions falls in an interval when a major transformation of the atmospheric circulation occurred in Eurasia.…”

mentioning

confidence: 99%

Holocene environments and climate in the Mongolian Altai reconstructed from the Hoton-Nur pollen and diatom records: a step towards better understanding climate dynamics in Central Asia

Rudaya

Tarasov

Dorofeyuk

et al. 2009

Quaternary Science Reviews

222

148

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a b s t r a c tThis study presents the results of the palynological and diatom analyses of the sediment core recovered in Hoton-Nur Lake (48 37 0 18 00 N, 88 20 0 45 00 E, 2083 m) in 2004. Quantitative reconstruction of the Holocene vegetation and climate dynamics in the semiarid Mongolian Altai suggests that boreal woodland replaced the primarily open landscape of northwestern Mongolia at about 10 kyr BP (1 kyr ¼ 1000 cal yr) in response to a noticeable increase in precipitation from 200-250 mm/yr to 450-550 mm/yr. A decline of the forest vegetation and a return to a predominance of open vegetation types occurred after 5 kyr BP when precipitation sums decreased to 250-300 mm/yr. Prior to 11.5 kyr PB diatom concentrations are relatively low and the lake is dominated by planktonic Cyclotella and small Fragilariaceae, suggesting the existence of a relatively deep and oligotrophic/mesotrophic lake. The great abundance of Staurosirella pinnata from the beginning of the record until 10.7 kyr BP might imply intensified erosion processes in the catchment and this is fully consistent with the presence of scarce and dry vegetation and the generally arid climate during this period. From about 10.7 kyr BP, more planktonic diatom taxa appeared and increased in abundance, indicating that the lake became more productive as diatom concentration increased. This change correlates well with the development of boreal woodland in the catchment. Decrease in precipitation and changes in the vegetation towards steppe are reflected by the rapid increase in Aulacoseira distans from about 5 kyr BP. The Holocene pollen and diatom records do not indicate soil and vegetation cover disturbances by the anthropogenic activities, implying that the main transformations of the regional vegetation occurred as a result of the natural climate change. Our reconstruction is in agreement with the paleomonsoon records from China, demonstrating an abrupt strengthening of the summer monsoon at 12 kyr BP and an associated increase in precipitation and in lake levels between 11 and 8 kyr BP, followed by the stepwise attenuation of the monsoon circulation and climate aridization towards the modern level. The records from the neighboring areas of Kazakhstan and Russia, situated west and north of Hoton-Nur, demonstrate spatially and temporally different Holocene vegetation and climate histories, indicating that the Altai Mountains as a climate boundary are of pivotal importance for the Holocene environmental and, possibly, habitation history of Central Asia.

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“…North of the Mongolian Altai, a cold and dry climate in the Early Holocene was reconstructed for the Russian Altai and Tuva (Blyakharchuk et al, 2004(Blyakharchuk et al, , 2007(Blyakharchuk et al, , 2008Westover et al, 2006;Ilyashuk B., Ilyashuk E., 2007). In the southeastern portion of the Mongolian Altai and in Tuva, alpine meadow area coverage decreased, while wormwood steppe with ephedra in combination with yernik tundra expanded.…”

Section: Discussionmentioning

confidence: 99%

“…Several publications are focused on the Late Pleistocene and Holocene environmental changes in Northern and Central Kazakhstan (Tarasov, Jolly, Kaplan, 1997;Kremenetski, Tarasov, Cherkinsky, 1997), and in the Russian Altai and Tuva (Blyakharchuk et al, 2004(Blyakharchuk et al, , 2007(Blyakharchuk et al, , 2008Schlütz, Lehmkuhl, 2007). These works are supplemented by results of analysis of diatom (Westover et al, 2006) and chironomid remains (Ilyashuk B., Ilyashuk E., 2007) from the Altai and Tuva.…”

Section: Based On Palynological and Diatom Analyses Of The Sediment Cmentioning

confidence: 99%

Environmental Changes in the Mongolian Altai During the Holocene

Rudaya

Tarasov

Dorofeyuk

et al. 2008

Archaeology, Ethnology and Anthropology of Eurasia

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

Abstract: Westover, Karlyn S.; Fritz, Sherilyn C.; Blyakharchuk, Tatyana A.; and Wright, Herbert E., "Diatom paleolimnological record of Holocene climatic and environmental change in the Altai Mountains, Siberia" (2006).

Cited by 40 publications

References 52 publications

A combined paleolimnological/genetic analysis of diatoms reveals divergent evolutionary lineages of Staurosira and Staurosirella (Bacillariophyta) in Siberian lake sediments along a latitudinal transect

A combined paleolimnological/genetic analysis of diatoms reveals divergent evolutionary lineages of Staurosira and Staurosirella (Bacillariophyta) in Siberian lake sediments along a latitudinal transect

Holocene environments and climate in the Mongolian Altai reconstructed from the Hoton-Nur pollen and diatom records: a step towards better understanding climate dynamics in Central Asia

Environmental Changes in the Mongolian Altai During the Holocene

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