Photoautotrophic picoplankton of the Kara Sea in the middle of summer: Effect of first-year ice retreat on carbon and chlorophyll biomass and primary production

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research Pub Date : 2024-10-23 DOI:10.1016/j.marenvres.2024.106809

Tatiana A. Belevich , Andrey B. Demidov , Olga V. Vorob'eva , Alexandr A. Polukhin , Sergey A. Shchuka , Elena V. Eremeeva , Michail V. Flint

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引用次数: 0

Abstract

The Arctic warming leads to a decline in sea-ice extent and thickness, rapid warming and freshening of the sea surface which impact the distribution of phytoplankton size composition. Picophytoplankton is an ecologically important component of Arctic pelagic marine ecosystems, and its role may be altered by global warming. In this study, the abundance and biomass, the chlorophyll a (Chl-a) and primary production (PP) of picophytoplankton, and its spatial and temporal distribution were investigated in the Kara Sea during the ice-melt season in July 2019. Picophytoplankton played a major role in the surface PP in the southern and western areas of the Kara Sea. In the surface layer, the contribution of picophytoplankton to total Chl-a increased insignificantly, and the contribution of picophytoplankton to total PP decreased significantly with the time of sea ice retreat. In the euphotic zone, the Chl-a concentration of picophytoplankton and its contribution to total Chl-a decreased with the time of sea ice retreat. The average picophytoplankton biomass determined in the present study (2.72 ± 5.10 mg C m⁻³) corresponded to the biomass estimates in the Arctic. The picophytoplankton community was strongly dominated by eukaryotes, cyanobacteria were only detected at 3 out of 11 stations, with maximum abundances (0.07 × 10⁹ cells m⁻³) observed at depths below 15 m. The obtained results contribute significantly to the study of the picophytoplankton dynamics during the ice-melting season in the hard-to-reach Kara Sea.

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盛夏喀拉海的光自养微浮游生物：第一年冰退对碳和叶绿素生物量及初级生产的影响。

北极变暖导致海冰范围和厚度下降、海面迅速变暖和清新，从而影响了浮游植物的大小分布。浮游植物是北极水层海洋生态系统的重要生态组成部分，其作用可能因全球变暖而改变。本研究调查了2019年7月融冰季节喀拉海浮游微藻的丰度和生物量、叶绿素a（Chl-a）和初级产量（PP）及其时空分布。浮游微藻在喀拉海南部和西部地区的表层初级生产力中发挥了主要作用。在表层，浮游微藻对总 Chl-a 的贡献率增加不明显，而浮游微藻对总 PP 的贡献率随着海冰消退时间的推移显著下降。在透光层，微微浮游植物的 Chl-a 浓度及其对总 Chl-a 的贡献率随着海冰消退时间的推移而下降。本研究测定的浮游微藻平均生物量（2.72 ± 5.10 mg C m-3）与北极地区的生物量估计值相符。微浮游生物群落主要以真核生物为主，11 个站位中只有 3 个站位检测到蓝藻，最大丰度（0.07 × 109 cells m-3）观测深度低于 15 米。

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来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.