Abstract Surface sediments from 18 boxcores across the Canadian Arctic provide the first assessment of modern non-pollen, non-dinocyst palynomorph regional distribution patterns. Palynomorphs are abundant and well-preserved (~400–21,900 ind./g; average 5730 ind./g), comprising acritarchs, zoomorphs (invertebrate eggs, egg capsules, mouthparts), foraminiferal linings, tintinnid loricae, ciliate cysts, and freshwater algae. Acritarch P and Halodinium minor were the most abundant and widely distributed acritarchs (avg. ~410 and ~340 ind./g, respectively). Invertebrate eggs (avg. ~570 ind./g) and foraminiferal linings (avg. ~1600 ind./g) were prominent. Six tintinnid forms were identified, cf. Parafavella parumdentata (avg. ~40 ind./g; 10 stations) showing the widest distribution. Ciliate cysts included Strombidium? cyst A, a spherical, flask-shaped cell with short spines and a rounded base (avg. ~120 ind./g; 16 stations). Pediastrum sp. (avg. ~140 ind./g) and Botryococcus sp. (avg. ~1040 ind./g) were especially abundant in the west, likely delivered via rivers. Out of 14 environmental parameters only sedimentary biogenic silica (%Si(opal)) was significant in explaining palynomorph variation. At group level, tinitinnids showed the strongest positive correlation to %Si(opal). Individually, the tintinnid Acanthostomella? sp. 1, ciliate cyst Fusopsis? cyst A, and the acritarch Palaeostomocystis fritilla were almost solely and positively explained by %Si(opal). This suggests that %Si(opal) strongly determines palynomorph variability, particularly for microzooplankton, implying that siliceous organisms (diatoms) play an important role in shaping palynomorph content in the sedimentary record. Our data suggest that palynomorphs represent a valuable addition to organic-walled microfossils (dinocysts) routinely used in this region, offering a unique multiproxy glimpse into the ecosystem.

中文翻译：

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来自西北航道-巴芬湾地区的勘察横断面中现代海洋沉积物的水生孢粉形物

摘要 来自加拿大北极地区 18 个箱形岩心的表层沉积物首次评估了现代非花粉、非双胞胎孢粉型区域分布模式。孢粉虫种类丰富且保存完好（约 400–21,900 ind./g；平均 5730 ind./g），包括acritarchs、zoomorphs（无脊椎动物卵、卵囊、口器）、有孔虫内壁、tintinnid loricae、纤毛虫囊肿和淡水藻类。Acritarch P 和 Halodinium minor 是最丰富和分布最广的 acritarchs（平均分别为 ~410 和 ~340 ind./g）。无脊椎动物卵（平均约 570 ind./g）和有孔虫内衬（平均约 1600 ind./g）很突出。鉴定了六种tintinnid形式，参见。Parafavella parumdentata（平均~40 ind./g；10站）显示最广泛的分布。纤毛虫囊肿包括Strombidium？囊肿 A，球形，具有短刺和圆形基部的烧瓶形细胞（平均约 120 指数/克；16 个站）。Pediastrum sp. （平均~140 指数/克）和葡萄球菌属。（平均约 1040 ind./g）在西部特别丰富，可能通过河流输送。在 14 个环境参数中，只有沉积生物二氧化硅 (%Si(opal)) 在解释孢粉变化方面具有重要意义。在组级别，tinitinnids 与 %Si(opal) 显示出最强的正相关。单独地，tintinnid Acanthostomella？sp. 1、纤毛虫囊肿 Fusopsis？囊肿 A 和 acritarch Palaeostomocystis fritilla 几乎完全由 %Si(opal) 进行了正面解释。这表明 %Si(opal) 强烈决定了孢粉体的变异性，特别是对于微型浮游动物，这意味着硅质生物（硅藻）在形成沉积记录中的孢粉体含量方面发挥着重要作用。我们的数据表明，孢粉体是该地区常规使用的有机壁微化石（双胞胎）的宝贵补充，提供了对生态系统的独特多代理一瞥。