We examine the living and dead benthic foraminiferal assemblages from the topmost 10 cm (using 150 μm sieve fraction) of three sedimentological short records collected in the Kveithola Trough (northwest Barents Sea). Our aim is to reconstruct the environmental variations of the last decades, connected to the interaction among the North Atlantic and the Arctic water masses. Our samples are collected at water depths between 150 and 380 m during the Eurofleets2-BURSTER oceanographic cruise, on board of the R/V Polarstern (June 2016).

In the Cell Tracker Green (CTG) labelled living foraminiferal fauna, the main species are Pullenia bulloides, Globobulimina auriculata, and Nonionellina labradorica, while in the dead assemblages the main species are Cassidulina neoteretis, Cibicidoides lobatulus, and Cassidulina reniforme (outer, inner, and shelf stations, respectively). The dead foraminiferal assemblages show no significant traceable environmental changes in the Kveithola Trough area occurred during the last ca. 100 years. Conversely, the living foraminiferal fauna shows that this area is subject to variations related to circulation changes and organic matter burial in sediments, to which the biota adapts quickly. Moreover, the species that are only observed in the dead foraminiferal assemblages and not in the living CTG-labelled foraminiferal assemblages (e.g. C. reniforme) are typical of colder water and highlight the ongoing warming of the Arctic area. We find that the preservation of foraminiferal tests may bias the paleontological results. The agglutinated tests are often disintegrated, and the delicate calcareous ones are broken. The environmental conditions (style of sedimentation, bottom currents, interaction with other communities) can weaken the foraminiferal tests and make them prone to breakage or dissolution.

我们从 Kveithola 海槽（巴伦支海西北部）收集的三个沉积学短记录的最顶部 10 厘米（使用 150 微米筛分）检查活的和死的底栖有孔虫组合。我们的目标是重建过去几十年的环境变化，与北大西洋和北极水团之间的相互作用有关。我们的样本是在 Eurofleets2-BURSTER 海洋航行期间，在 R/V Polarstern 上（2016 年 6 月）在 150 到 380 m 之间的水深处收集的。

在Cell跟踪绿（CTG）标记的活有孔虫，主要品种是Pullenia bulloides，Globobulimina蕨，和Nonionellina labradorica，而在死组合的主要种类是Cassidulina neoteretis，Cibicidoides lobatulus和Cassidulina肾叶（分别为外部、内部和货架站）。死亡的有孔虫组合显示在最后一个大约 10 年期间，Kveithola 海槽地区没有发生显着的可追踪环境变化。100年。相反，活的有孔虫动物群表明该地区受到与循环变化和沉积物中有机物埋藏相关的变化的影响，生物群很快适应了这些变化。此外，仅在死的有孔虫组合中观察到的物种，而不是在活的 CTG 标记的有孔虫组合中观察到的物种（例如C. reniforme) 是冷水的典型代表，并突出了北极地区持续变暖。我们发现保留有孔虫试验可能会影响古生物学结果。凝集试片常崩解，细腻的钙质试片破碎。环境条件（沉积方式、底流、与其他群落的相互作用）会削弱有孔虫的测试并使其易于破裂或溶解。