The composition and abundance of phytoplankton after spring bloom in the Arctic Svalbard fjords SCIE SCOPUS

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Title
The composition and abundance of phytoplankton after spring bloom in the Arctic Svalbard fjords
Author(s)
Bae, Seongjun; Kim, Haryun; Nam, Seung-Il; Choi, Keun-Hyung; Kim, Tae-Wook; Yun, Sung Tae; Kim, Hye Seon; Kim, Tae-Hoon; Han, Dukki; Ko, Young Ho; Kim, Ju-Hyoung; Lim, Young Kyun; Park, Joo Myun
KIOST Author(s)
KIM, Ha Ryun(김하련)Lim, Young Kyun(임영균)
Alternative Author(s)
김하련; 임영균; 박주면
Publication Year
2022-09
Abstract
Glacial melting and massive spring blooms caused by global warming have significantly altered the environmental conditions in the Svalbard fjords of the European Arctic. These changes included reduced salinity (the gradient of salinity from inner to outer fjords, ranging from 23 to 34 PSU), stratification of the water column, increased turbidity (>135 FTU), low nutrient conditions (0.06–1.13 μM PO4−, 1.19–3.54 μM NO3−, 1.19–3.54 μM NH4+, and −2.1 to 0.9 N*), reduced light penetration, and release of organic matter, resulting in changes in the structure and composition of the phytoplankton. Our study, conducted in Isfjorden, van Mijenfjorden/Bellsund, and Hornsund of Svalbard in early August 2019, observed the dominance of cryptophytes in the phytoplankton composition after the spring bloom. Our results show a different phenomenon from the previous diatom/dinoflagellate dominance in the late 1970s and the early 2020s. Changes in phytoplankton composition can be explained as follows. (1) The excessive consumption of nutrients during spring bloom and the reduction of nutrient mixing in the water column stratification due to glacier melting has formed nutrient-depleted conditions, providing favorable conditions for the small-sized phytoplankton that easily find nutrients. (2) A wide range of salinities has created beneficial conditions for cryptophytes, capable of controlling osmotic stress against various salinities, of surviving compared to diatoms and dinoflagellates. (3) Finally, the influx of organic matter into fjords due to glacier melting can increase turbidity and decrease light availability; therefore, cryptophytes with mixotrophic metabolisms could be more viable than diatoms with only autotrophic metabolisms. In summary, the dynamic environmental conditions after enhanced spring bloom and glacier melting will further alter phytoplankton compositions and, in turn, influence food webs at higher tropical levels in European Arctic fjord ecosystems. © 2022 Elsevier Ltd
ISSN
0272-7714
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43115
DOI
10.1016/j.ecss.2022.107970
Bibliographic Citation
Estuarine, Coastal and Shelf Science, v.275, 2022
Publisher
Academic Press
Keywords
Cryptophyceae; Diatom; Dinophyceae; Glacier melting; Phytoplankton; Svalbard fjords
Type
Article
Language
English
Document Type
Article
Publisher
Academic Press
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