Stuart Jacqui, Robinson Natalie, Stewart Craig, Smith Kirsty F, Pearman John K, Halfter Svenja, Leonard Greg, Ryan Ken G
Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand.
Cawthron Institute, Private Bag 2, Nelson 7042, New Zealand.
iScience. 2025 Apr 15;28(5):112417. doi: 10.1016/j.isci.2025.112417. eCollection 2025 May 16.
This study investigates the impact of unseasonable storm events in McMurdo Sound, Antarctica, in 2022 on eukaryotic microalgal communities (EMCs). We assessed EMCs from the fast-ice and sub-ice platelet layer (SIPL) associated with fast-ice formed during March (historical timing) and September (five months later). We compared three ice conditions: March-ice (fast ice with SIPL, frozen in March), September-ice (fast ice with SIPL, frozen in September), and September-no-SIPL (fast-ice without SIPL, frozen in September). Using metabarcoding and light microscopy, results showed higher diversity in March-ice EMCs compared to September-no-SIPL. Community structure was significantly influenced by ice condition and ice type. March-ice had the most unique ASVs, of all ice conditions. Biomass peaked in March-ice SIPLs at 25-50 cm, while September-ice SIPLs peaked at 0-25 cm. These findings demonstrate delayed ice formation alters EMC structure, diversity, and biomass, potentially impacting primary productivity, nutrient cycling, and Antarctic sea ice ecosystems.
本研究调查了2022年南极麦克默多湾不合时令的风暴事件对真核微藻群落（EMCs）的影响。我们评估了与3月（历史时间）和9月（五个月后）形成的固定冰相关的固定冰和冰下血小板层（SIPL）中的EMCs。我们比较了三种冰况：3月冰（带有SIPL的固定冰，3月冻结）、9月冰（带有SIPL的固定冰，9月冻结）和9月无SIPL（无SIPL的固定冰，9月冻结）。使用宏条形码和光学显微镜，结果显示，与9月无SIPL相比，3月冰中的EMCs多样性更高。群落结构受冰况和冰类型的显著影响。在所有冰况中，3月冰具有最独特的扩增子序列变异（ASVs）。生物量在3月冰的SIPL中25 - 50厘米处达到峰值，而9月冰的SIPL在0 - 25厘米处达到峰值。这些发现表明，冰形成的延迟会改变EMC的结构、多样性和生物量，可能影响初级生产力、营养物质循环和南极海冰生态系统。
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