Spatio–temporal variability of diatom assemblages in surface sediments of Lake Peipsi

Puusepp, Liisa; Punning, J-M

doi:10.1016/j.jglr.2010.11.018

Cited by 9 publications

(8 citation statements)

References 31 publications

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“…The mineralogical composition of 32 freeze-dried and milled samples was analysed by standard X-ray diffractometry (XRD) using a Philips PW1820 goniometer at AWI Bremerhaven applying cobalt-potassium alpha (CoKα) radiation (40 kV, 40 mA) as outlined in Petschick et al (1996). The intensity of diffracted radiation was calculated as counts of peak areas using XRD processing software MacDiff 4.0.7 (freeware developed by Rainer Petschick in 1999).…”

Section: X-ray Fluorescence and X-ray Diffractometrymentioning

confidence: 99%

“…These are primarily dependent on slope steepness (Hakanson, 1977) or, in shallow areas, wind-induced bottom shear stress (Bennion et al, 2010;Yang et al, 2009). Nevertheless, it already has been proven for other lake sites that within-lake bioindicator distributions are laterally non-uniform, contradicting the assumption that mixing processes cause homoge-nous microfossil assemblages before deposition (Anderson, 1990;Wolfe, 1996;Anderson et al, 1994;Earle et al, 1988;Kingston et al, 1983;Puusepp and Punning, 2011;Stewart and Lamoureux, 2012;Yang et al, 2009). However, many palaeolimnological studies employ single-site approaches using only one sediment core and hence do not encompass the full spatial extent and natural variability of the entire lake sediment archive.…”

Section: Introductionmentioning

confidence: 99%

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Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia

et al. 2019

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Abstract. Rapidly changing climate in the Northern Hemisphere and associated socio-economic impacts require reliable understanding of lake systems as important freshwater resources and sensitive sentinels of environmental change. To better understand time-series data in lake sediment cores, it is necessary to gain information on within-lake spatial variabilities of environmental indicator data. Therefore, we retrieved a set of 38 samples from the sediment surface along spatial habitat gradients in the boreal, deep, and yet pristine Lake Bolshoe Toko in southern Yakutia, Russia. Our methods comprise laboratory analyses of the sediments for multiple proxy parameters, including diatom and chironomid taxonomy, oxygen isotopes from diatom silica, grain-size distributions, elemental compositions (XRF), organic carbon content, and mineralogy (XRD). We analysed the lake water for cations, anions, and isotopes. Our results show that the diatom assemblages are strongly influenced by water depth and dominated by planktonic species, i.e. Pliocaenicus bolshetokoensis. Species richness and diversity are higher in the northern part of the lake basin, associated with the availability of benthic, i.e. periphytic, niches in shallower waters. δ18Odiatom values are higher in the deeper south-western part of the lake, probably related to water temperature differences. The highest amount of the chironomid taxa underrepresented in the training set used for palaeoclimate inference was found close to the Utuk River and at southern littoral and profundal sites. Abiotic sediment components are not symmetrically distributed in the lake basin, but vary along restricted areas of differential environmental forcing. Grain size and organic matter are mainly controlled by both river input and water depth. Mineral (XRD) data distributions are influenced by the methamorphic lithology of the Stanovoy mountain range, while elements (XRF) are intermingled due to catchment and diagenetic differences. We conclude that the lake represents a valuable archive for multiproxy environmental reconstruction based on diatoms (including oxygen isotopes), chironomids, and sediment–geochemical parameters. Our analyses suggest multiple coring locations preferably at intermediate depth in the northern basin and the deep part in the central basin, to account for representative bioindicator distributions and higher temporal resolution, respectively.

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Section: X-ray Fluorescence and X-ray Diffractometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia

et al. 2019

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“…6d, e) supports the proposal that the planktonic/benthic diatom ratio could be used as an indicator for historical water depth (Gasse et al 1989;Stoermer and Smol 1999). Limnological studies also show that diatom assemblages may vary sequentially from the littoral to the profundal zone along a gradient of water depth (Cantonati et al 2009;Puusepp and Punning 2011;Smol and Stoermer 2010;Stone and Fritz 2004).…”

Section: Discussionmentioning

confidence: 99%

Spatial distributions and environmental implications of diatom assemblages in surface sediments of Hulun Lake, China

Wang

Liu

et al. 2015

Environ Earth Sci

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“…In Table 1 the radiocarbon dates obtained by the AMS method are also given in calibrated years (cal. yr BP) revised by Puusepp (2011), calculated with IntCal09 (Reimer et al 2009) in OxCal v4.1.3 (Bronk Ramsey 2009). Hereafter all dates are given in conventional 14 C years before present (BP) for better comparison with previously published data.…”

Section: Chronology Cartographic Analysis and Palaeoreconstructionsmentioning

confidence: 99%

Lake basin development in the Holocene and its impact on the sedimentation dynamics in a small lake (southern Estonia)

Terasmaa¹

2011

Estonian J. Earth Sci.

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Small lakes and their sediments are widely used for palaeolimnological reconstructions. Often only one core from the deepest part of the lake is used for reconstructing the lake catchment development, water-level changes and climate. To interpret palaeoinformation correctly, it is necessary to understand the spatio-temporal dynamics and the essence of lake basin evolution (topography, sedimentation zones, etc.) during the selected time period. The current study focuses on reconstructing the development of Lake Väike Juusa (southern Estonia) during the Holocene with the help of 3D digital elevation models compiled for the palaeolake stages at 9000 BP, 8000 BP, 4000 BP, 2000 BP and the present. The results suggest that we have to consider lake stages as completely different lakes with different sedimentation patterns – the hypsocraphic curve of Lake Väike Juusa was convex at the beginning of the Holocene and is concave nowadays. The proportion of the accumulation areas varied from 6% to 60% at the beginning of the Holocene and is around 30% nowadays. In order to understand lake basin development and water-level changes, the sampling sites should be selected close to the transitional zone and more than one core from a lake is needed. Commonly the sites located spatially rather close to each other have significantly different sedimentation patterns. Three-dimensional digital elevation models of palaeolake basins are useful tools for visualizing data and for hypothesizing about possible effects of lake-level fluctuations on the lake and its sedimentation regime

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Spatio–temporal variability of diatom assemblages in surface sediments of Lake Peipsi

Cited by 9 publications

References 31 publications

Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia

Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia

Spatial distributions and environmental implications of diatom assemblages in surface sediments of Hulun Lake, China

Lake basin development in the Holocene and its impact on the sedimentation dynamics in a small lake (southern Estonia)

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