Transactions of KarRC RAS :: Scientific publications
Transactions of KarRC RAS :: Scientific publications

Transactions of KarRC RAS :: Scientific publications
Karelian Research Centre of RAS
ISSN (print): 1997-3217
ISSN (online): 2312-4504
Transactions of KarRC RAS :: Scientific publications
Background Editorial committee Editorial Office For authors For reviewer Russian version
Transactions of KarRC RAS :: Scientific publications

Electronic Journal OJS



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Biogeography

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Precambrian Geology

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Limnology and Oceanology

Research in the Humanities (2010-2015)

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1999-2008


SCIENTIFIC PUBLICATIONS
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- Daphnia cristata Sars, 1862 Diaphanosoma brachyurum (Liévin, 1848) 2016 - 2020 . (. )
//  . No 9. . . . 2021. C. 102113
A.N. Chernyshev, A.B. Stepanova. Spatiotemporal variability of Daphnia cristata Sars, 1862 and Diaphanosoma brachyurum (Liévin, 1848) populations in lake Leschovoye in 20162020 // Transactions of Karelian Research Centre of Russian Academy of Science. No 9. Limnology and oceanology. 2021. P. 102113
Keywords: Valaam archipelago; small lakes; zooplankton; interspecific competition; effect of limnological parameters; human impact
The article presents results on the spatiotemporal variability of two zooplankton species Daphnia cristata and Diaphanosoma brachyurum, in Lake Leschovoye. Surveys were conducted from June to September in 20162020. According to monitoring data from this period, the abundance of these species varied widely over time. Specific surveys at six sites in JulyAugust 20192020 revealed also high spatial variation of the species abundances. Compared to the other species, D. cristata dominated in the lake with a 71 % share in Cladocera abundance. In 2020, however, D. brachyurum abundance was relatively high. In this period, its share in the cladoceran zooplankton reached 31 % and was twice that of D. cristata that year. A positive effect of water transparency on D. brachyurum abundance was observed. The study found no significant effect of other limnological parameters (gas conditions, pH, dissolved organic matter concentration, water color and turbidity) on the species. Another factor potentially influencing the species abundance is interspecific competition for food, as the range of particles consumed by the species is similar. Alongside competition, predation of plankton-feeding fishes and organic matter input with runoff from managed meadows can affect the abundance of the species. The effect of the runoff, nonetheless, can be dual. In some years, large amounts of allochthonous organic matter can lead to suppression of both species by clogging their filtration system. In other periods, runoff can lower water transparency thereby reducing the hunting efficiency of plankton-feeding fishes and leading to an increase in D. brachyurum abundance.
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  Last modified: September 30, 2021