Abstract：
How microzooplanktonic ciliate adaptative strategies differ across diatom bloom and non-diatom bloom areas in the Arctic Ocean remains poorly documented. To address this gap, two different situations were categorized in the Arctic Ocean at summer 2023: diatom bloom stations (DBS) (genus Thalassiosira, chain-like) and non-diatom bloom stations (nDBS). Total abundance of ciliate at 3 m and 25 m in DBS was 2.8 and 1.8 folds higher than in nDBS, respectively. Aloricate ciliates were singled out in both DBS and nDBS, whilst their average abundance and biomass of large size-fraction (>50 μm) in former were 4.5-5.6 folds higher than in latter. Regarding tintinnids, high abundance of Ptychocylis acuta (Bering Strait species) mainly occurred at DBS, coupled with distribution of co-occurring Pacific-origin species Salpingella sp.1, collectively suggested a strong intrusion of Pacific Inflow during summer 2023. Additionally, presence of high abundance of Acanthostomella norvegica and genus Parafavella in nDBS might indicate the trajectory of the Transpolar Drift. Alternatively, tintinnids can serve as credible bioindicators for either monitoring currents or evaluating microzooplankton Borealization. Average abundance of total ciliate within 15-135 μm body-size spectrum in DBS was higher than nDBS. Moreover, spearman\'s rank correlation between biotic and abiotic analysis revealed that temperature and dissolved oxygen at DBS determined tintinnid species richness and ciliate total abundance, respectively. The results clearly demonstrate that remarkable divergences in large size-fraction of ciliate abundance between DBS and nDBS validate their irreplaceable role in controlling phytoplankton outbreak and associated biological processes in polar seas.
摘要：
在北冰洋的硅藻开花和非硅藻开花地区，微浮游纤毛虫适应策略的差异仍然很少。为了解决这个差距，2023年夏季，在北冰洋对两种不同的情况进行了分类：硅藻开花站（DBS）（Thalassiosira属，链状)和非硅藻开花站(nDBS)。DBS中3m和25m处的纤毛虫总丰度比nDBS高2.8和1.8倍，分别。在DBS和nDBS中都挑出了Aloricate纤毛虫，前者的平均丰度和大尺寸分数（>50μm）的生物量比后者高4.5-5.6倍。关于tintinnids，大量的Ptychocylisacuta（白令海峡物种）主要发生在DBS，再加上同时发生的太平洋起源物种沙门氏菌sp.1的分布，共同表明了2023年夏季太平洋流入的强烈入侵。此外,nDBS中norvegica和Parafavella属的大量存在可能表明了跨极漂移的轨迹。或者，tintinnids可以作为可靠的生物指标，用于监测海流或评估微浮游动物越化。DBS中15-135μm体型光谱内总纤毛虫的平均丰度高于nDBS。此外，生物和非生物分析之间的spearman等级相关性表明，DBS的温度和溶解氧决定了丁丁尼德物种的丰富度和纤毛虫的总丰度，分别。结果清楚地表明，DBS和nDBS之间纤毛虫丰度的大尺寸部分的显着差异证实了它们在控制极地海洋中浮游植物爆发和相关生物过程中的不可替代作用。
