Phytoplankton and ice-algal communities in the seasonal ice zone during January (Southern Ocean, Indian sector)

被引:0
作者
Keigo D. Takahashi
Ryosuke Makabe
Shintaro Takao
Haruhiko Kashiwase
Masato Moteki
机构
[1] The Graduate University for Advanced Studies,
[2] SOKENDAI,undefined
[3] National Institute of Polar Research,undefined
[4] Tokyo University of Marine Science and Technology,undefined
[5] National Institute for Environmental Studies,undefined
[6] National Institute of Technology,undefined
[7] Tomakomai College,undefined
来源
Journal of Oceanography | 2022年 / 78卷
关键词
Polar oceans; Phytoplankton; Ice algae; Seeding; Sea ice; Southern Ocean;
D O I
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中图分类号
学科分类号
摘要
In the seasonal ice zone (SIZ), sea-ice algae have been hypothesized to influence phytoplankton species composition in seawater after melting from sea ice. However, information on ice-algal species composition during summer (December–February) was small particularly in the Indian sector of the Southern Ocean. We investigated sea-ice macronutrient concentrations and relationships between phytoplankton and ice-algal species composition in this region during January of 2018–2020. The species composition of ice algae each year (after weighted-averaged by sample volume for each sea ice) was dominated by the diatom Fragilariopsis cylindrus (78–89% of total cells). This result differed from ice-algal compositions in spring but consistent with those in summer, indicating seasonal changes in species composition of ice algae at East Antarctic SIZ. Using all years’ sea-ice data, we found nitrate + nitrite: phosphate ratio declined significantly with increased algal concentrations. Diatoms’ uptake ratio of macronutrients and remineralization of phosphorus from their products (e.g., dissolved organic matter) may result in this relationship, which indicates algal accumulation especially of diatoms in sea ice. At the ice-sampling stations, phytoplankton was dominated by F. cylindrus, while at the northern stations, higher proportions of F. kerguelensis, Pseudo-nitzschia prolongatoides/subcurvata, and Gymnodiniales were observed. The similarity index of sea-ice and phytoplankton composition was negatively correlated with days elapsed since sea-ice retreat and surface seawater temperature at each sampled station. This suggests that phytoplankton species composition might be influenced by release of ice algae where the influence of sea ice is strong during summer.
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页码:409 / 424
页数:15
相关论文
共 206 条
[1]  
Alderkamp AC(2019)Effects of iron and light availability on phytoplankton photosynthetic properties in the Ross Sea Mar Ecol Prog Ser 621 33-50
[2]  
van Dijken GL(2008)Distribution and ecology of Polar Biol 31 429-442
[3]  
Lowry KE(2020) species (Bacillariophyceae) in surface waters of the Weddell Sea (Antarctica) J Exp Mar Biol Ecol 532 1-20
[4]  
Almandoz GO(2006)Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity Polar Biosci 20 746-756
[5]  
Ferreyra GA(1992)Frontal positions and mixed layer evolution in the Seasonal Ice Zone along 140°E in 2001/02 J Phycol 28 255-268
[6]  
Schloss IR(1995)The influence of salinity and temperature covariation on the photophysiological characteristics of Antarctic sea ice microalgae Mar Ecol Prog Ser 127 365-367
[7]  
Antoni JS(1999)High resolution study of the platelet ice ecosystem in McMurdo Sound, Antarctica: biomass, nutrient, and production profiles within a dense microalgal bloom Science 283 3316-252
[8]  
Almandoz GO(2003)Phytoplankton community structure and the drawdown of nutrients and CO J Geophys Res: Oceans 108 C08004-431
[9]  
Ferrario ME(2008) in the Southern Ocean J Geophys Res: Oceans 113 235-2613
[10]  
Aoki S(2014)Physical control of chlorophyll Elem Sci Anth 2 421-426