TY  - JOUR
A1  - Frolova, Larisa
A1  - Nazarova, Larisa B.
A1  - Pestryakova, Luidmila Agafyevna
A1  - Herzschuh, Ulrike
T1  - Subfossil Cladocera from surface sediment in thermokarst lakes in northeastern Siberia, Russia, in relation to limnological and climatic variables
JF  - Journal of paleolimnolog
N2  - Subfossil Cladocera were sampled and examined from the surface sediments of 35 thermokarst lakes along a temperature gradient crossing the tree line in the Anabar-river basin in northwestern Yakutia, northeastern Siberia. The lakes were distributed through three environmental zones: typical tundra, southern tundra and forest tundra. All lakes were situated within the continuous permafrost zone. Our investigation showed that the cladoceran communities in the lakes of the Anabar region are diverse and abundant, as reflected by taxonomic richness, and high diversity and evenness indices (H = 1.89 +/- A 0.51; I = 0.8 +/- A 0.18). CONISS cluster analysis indicated that the cladoceran communities in the three ecological zones (typical tundra, southern tundra and forest-tundra) differed in their taxonomic composition and structure. Differences in the cladoceran assemblages were related to limnological features and geographical position, vegetation type, climate and water chemistry. The constrained redundancy analysis indicated that T-July, water depth and both sulphate (SO4 (2-)) and silica (Si4+) concentrations significantly (p a parts per thousand currency sign 0.05) explained variance in the cladoceran assemblage. T-July featured the highest percentage (17.4 %) of explained variance in the distribution of subfossil Cladocera. One of the most significant changes in the structure of the cladoceran communities in the investigated transect was the replacement of closely related species along the latitudinal and vegetation gradient. The results demonstrate the potential for a regional cladoceran-based temperature model for the Arctic regions of Russia, and for and Yakutia in particular.
KW  - Cladocera
KW  - Russian Arctic
KW  - Temperature
KW  - Water depth
KW  - Palaeolimnology
Y1  - 2014
U6  - https://doi.org/10.1007/s10933-014-9781-7
SN  - 0921-2728
SN  - 1573-0417
VL  - 52
IS  - 1-2
SP  - 107
EP  - 119
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Frolova, Larissa A.
A1  - Ibragimova, A. G.
A1  - Subetto, D. A.
A1  - Nazarova, Larisa B.
A1  - Syrykh, Lydmila S.
T1  - Paleoecological and paleoclimatic reconstructions for the Karelian Isthmus based on the study of subfossil cladocerans from Lake Medvedevskoe (Northwest Russia)
JF  - Učënye Zapiski Kazanskogo Universiteta. Seriâ Estestvennye Nauki
JF  - Proceedings of Kazan University. Natural Sciences Series
N2  - The purpose of our study is to reconstruct the climatic and environmental changes that took place over the Holocene in Northwest Russia. The results of the palaeobiological analysis of cladoceran community of Lake Medvedevskoe (Karelian Isthmus, located between the Gulf of Finland of the Baltic Sea and Lake Ladoga, Northwest Russia) have been discussed. In the sediments of Lake Medvedevskoe, we have identified 38 cladoceran taxa that belong to 7 families: Bosminidae, Holopedidae, Chydoridae, Daphnidae, Polyphemidae, Macrotricidae, and Sididae. It has been revealed that Bosmina (Eubosmina) longispina and Alonella nana are the most common for subfossil Cladocera community of the lake. Palearctic and Holarctic species are dominant. Both pelagic and littoral taxa are well represented in the lake. The down-core changes in cladoceran community allowed to identify five statistically significant zones. It has been discovered that the taxonomic richness of biological communities is low at the bottom of the core with the dominance of typical northern species and increases towards the sediment surface alongside with the rise of organic content in sediments. Based on the shifts in the taxonomic composition of cladoceran community, we have concluded upon the trophic status of the lake and climate changes. The obtained data have been compared with the results of the chironomid analysis that was performed earlier.
KW  - paleoclimatic reconstructions
KW  - subfossil Cladocera
KW  - Lake Medvedevskoe
KW  - Karelian Isthmus
Y1  - 2017
SN  - 2542-064X
SN  - 2500-218X
VL  - 160
IS  - 1
SP  - 93
EP  - 110
PB  - Kazan Federal University
CY  - Kazan
ER  -