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Marine Ecology Progress Series

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MEPS 642:55-65 (2020)  -  DOI:

Impacts of meltwater discharge from marine–terminating glaciers on the protist community in Inglefield Bredning, northwestern Greenland

Kohei Matsuno1,2,*, Naoya Kanna2, Shin Sugiyama2,3, Atsushi Yamaguchi1,2, Eun Jin Yang4

1Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido 041-8611, Japan
2Arctic Research Centre, Hokkaido University, Kita-21 Nishi-11 Kita-ku, Sapporo, Hokkaido 001-0021, Japan
3Institute of Low Temperature Science, Hokkaido University, Kita-19 Nishi-8 Kita-ku, Sapporo, Hokkaido 060-0819, Japan
4Division of Polar Ocean Science, Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 21990, Republic of South Korea
*Corresponding author:

ABSTRACT: To evaluate the effects of meltwater discharge from marine-terminating glaciers on a fjord protist community in northwestern Greenland during summer, we investigated the distribution, abundance and biomass of the protist community and their relationships with hydrographic parameters. In the standing stock of protists, dinoflagellates (46.4%) and oligotrich ciliates (39.5%) were dominant throughout the study region. With respect to vertical distribution, oligotrich ciliates were abundant in the surface layer, mainly due to suitable food conditions (abundance of diatom and nanoflagellates). Near glaciers, relatively high chlorophyll a (chl a) concentrations were found in the subsurface layers associated with the low-temperature, high-turbidity and slightly high nutrient levels, indicating that the nutrient inputs from the upwelling glacial meltwater plume increased primary production. Large-sized Protoperidium spp. were found only at stations near glaciers where nutrients were abundant, and heterotrophic dinoflagellates showed strong relationships with nanoflagellates. These findings suggest that the upwelling associated with subglacial meltwater discharge can stimulate nanoflagellate production, resulting in increases in ciliate and heterotrophic dinoflagellate production.

KEY WORDS: Protist community · Meltwater discharge · Marine-terminating glacier · Ciliates · Dinoflagellates

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Cite this article as: Matsuno K, Kanna N, Sugiyama S, Yamaguchi A, Yang EJ (2020) Impacts of meltwater discharge from marine–terminating glaciers on the protist community in Inglefield Bredning, northwestern Greenland. Mar Ecol Prog Ser 642:55-65.

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