Assessment of important environmental factors in formation of spatial structure of phytoplankton in large subarctic rivers (Eastern Siberia)

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Abstract

On the basis of data-array analysis (2000–2011) of phytoplankton in large subarctic rivers; the rivers’ hydrochemical, hydrological, and morphological parameters; and climatic properties of the catchment-basin areas and by using stepwise discriminant analysis and clustering, it was determined that formation of phytoplankton spatial structure is mostly affected by climate rather than by physical-chemical properties of the river waters in northeastern Siberia. Floristic structure of phytoplankton is mostly connected to abiotic factors among phytoplankton-development indicators. The duration of vegetation-growth period is another important environmental factor.

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About the authors

V. A. Gabyshev

Institute for Biological Problems of Cryolithozone, Siberian Branch, Russian Academy of Sciences

Author for correspondence.
Email: v.a.gabyshev@ibpc.ysn.ru
Russian Federation, Yakutsk

O. I. Gabysheva

Institute for Biological Problems of Cryolithozone, Siberian Branch, Russian Academy of Sciences

Email: v.a.gabyshev@ibpc.ysn.ru
Russian Federation, Yakutsk

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Supplementary files

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2. Fig. 1. Map of the area of ​​work and observation points, classified by environmental indicators: 1 - 1st, 2 - 2nd, 3 - 3rd clusters. Rivers: 1 - Anabar, 2 - Olenek, 3 - Lena, 4 - Yana, 5 - Indigirka, 6 - Kolyma, 7 - Vilyuy, 8 - Vitim, 9 - Chara, 10 - Olekma, 11 - Amga, 12 - Aldan.

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3. Fig. 2. The average standardized characteristic values ​​for clusters, selected according to environmental indicators.

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4. Fig. 3. Scattering diagram of observations of the gradation “OS clusters” in two discriminant axes.

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5. Fig. 4. The scattering diagram of observations of the gradation “geographical confinement” in two discriminant axes: 1 - ZPB, 2 - PreimZPB, 3 - TsentrSib, 4 - YuzhSib, 5 - Shirotn, 6 - KrTrans.  

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