BIOLOGIYA MORYA, 2023, Vol. 49, No. 6, pp. 367-374

Dynamics of Phytoplankton Species Structure in the Kurile Lake (Kamchatka Peninsula)

© 2023 V. V. Sukhanov^{1, 2}, E. V. Lepskaya³

¹Zhirmunsky National Scientific Centre of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia;
²Far Eastern Federal University, Vladivostok 690001, Russia;
³Kamchatka Branch of the Federal State Budgetary Scientific Institution “VNIRO” (KamchatNIRO), Petropavlovsk-Kamchatsky 68300, Russia

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The species structure of the dominant community of unicellular algae inhabiting the spawning and feeding salmon lake was studied in the Kurile Lake (southern Kamchatka peninsula). It has been shown that this structure is well described by the Motomura model. The geometric progression coefficient does not differ significantly from the value prescribed by the model, which is based on the stochastic remainder hypothesis. Several integral indicators characterizing the species structure have been calculated. The study has revealed some typical and unusual correlations between these integral indices. Inter-annual and intra-annual cyclical fluctuations in the value of indicators have been found.

Key words: preemption hypothesis, stochastic remainder hypothesis, computation of succession rate, spectral density.