Bio-optical properties of algal communities in Antarctic pack ice during spring

IF 2.7 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Marine Systems Pub Date : 2023-05-01 DOI:10.1016/j.jmarsys.2023.103890

Laura A. Dalman , Christina Schallenberg , Alexander D. Fraser , Sophie Bestley , Eun Jin Yang , Lesley Clementson , Klaus M. Meiners

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引用次数: 0

Abstract

Microalgae use Antarctic sea ice as habitat and accumulate in spring, leading to significant early-season production in Southern Ocean ecosystems. As key contributors to the marine food web and carbon fixation within the Antarctic pack-ice zone, ice algae depend on the light environment and their adaptability to irradiance extremes. This study examines spectral ice algal and non-algal particulate absorption coefficients, pigments, and community composition in pack-ice cores sampled off East Antarctica and in the Weddell Sea during the winter-spring transitions in 2012 and 2013, respectively. Our results show that ice algae dominated particulate absorption in pack ice in both regions. From high- to low-light exposure in both East Antarctica and Weddell Sea, biomass-specific absorption decreased, suggesting strong pigment packaging with depth towards the ice-water interface. Ice algae also showed increased production of photoprotective pigments in the surface in comparison to the bottom of the sea ice, with flagellates being more dominant in the surface ice sections. Our results indicate species-specific light-acclimation and photoprotection through the ice profiles, and highlight the role of light conditions in influencing pigment production and shifts in community composition.

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春季南极浮冰中藻类群落的生物光学特性

微藻利用南极海冰作为栖息地，并在春季积累，导致南大洋生态系统在早季产生大量微藻。作为南极浮冰区海洋食物网和碳固定的关键贡献者，冰藻依赖于光环境及其对极端辐照度的适应性。这项研究分别考察了2012年和2013年冬春过渡期间在南极洲东部和威德尔海采样的浮冰芯中的光谱冰藻和非藻颗粒吸收系数、色素和群落组成。我们的研究结果表明，在这两个地区，冰藻主导了浮冰中的颗粒吸收。在南极洲东部和威德尔海，从高光到低光暴露，生物量比吸收降低，表明随着深度向冰水界面的增加，色素包装强烈。与海冰底部相比，冰藻表面的光保护色素产量也有所增加，鞭毛虫在表面冰段更占主导地位。我们的研究结果表明，通过冰剖面，物种特异性的光适应和光保护，并强调了光照条件在影响色素产生和群落组成变化中的作用。

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来源期刊

Journal of Marine Systems 地学-地球科学综合

CiteScore

6.20

自引率

3.60%

发文量

审稿时长

6 months

期刊介绍： The Journal of Marine Systems provides a medium for interdisciplinary exchange between physical, chemical and biological oceanographers and marine geologists. The journal welcomes original research papers and review articles. Preference will be given to interdisciplinary approaches to marine systems.