Abstract
Sampling was conducted along the quasi meridional transect at 130° E from the Lena River estuary to northern deep-sea regions of the Laptev Sea in September 2015. The latitudinal zonality and the impact of river runoff are manifested in the temperature and salinity distribution, concentration of particulate organic matter, and the structure of plankton communities. The differences in the chl a concentration and primary production along the transect are insignificant. The feeding rate of mesozooplankton herbivores was assessed by a fluorescence technique. The total consumption of phytoplankton biomass and primary production are estimated based on the feeding rate, abundance of zooplankton species, and their diel migrations. The daily grazing impact of zooplankton on phytoplankton biomass increases from 2% on the inner shelf to 3% on the mid-shelf, 5% on the outer shelf, and 10% in the deep-sea part of the basin. The consumption of primary production also increases: 1, 4.5, 5.7, and 13.9%, respectively. In the fall, the consumption of phytoplankton does not compensate the energy demands for respiration. The latitudinal zonality of the Laptev Sea appears not only in the hydrophysical water parameters and the structure of plankton communities, but also in their functional characteristics.
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Original Russian Text © E.G. Arashkevich, A.V. Drits, A.F. Pasternak, M.V. Flint, A.B. Demidov, A.B. Amelina, M.D. Kravchishina, I.N. Sukhanova, S.A. Shchuka, 2018, published in Okeanologiya, 2018, Vol. 58, No. 3, pp. 404–419.
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Arashkevich, E.G., Drits, A.V., Pasternak, A.F. et al. Distribution and Feeding of Herbivorous Zooplankton in the Laptev Sea. Oceanology 58, 381–395 (2018). https://doi.org/10.1134/S0001437018030013
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DOI: https://doi.org/10.1134/S0001437018030013