Biochemical investigation of multicorer sediment profile MSM29_453-1@en

To detect and track the impact of large-scale environmental changes in a the transition zone between the northern North Atlantic and the central Arctic Ocean, and to determine experimentally the factors controlling deep-sea biodiversity, the Alfred- Wegener-Institute for Polar and Marine Research (AWI) established the deep-sea long-term observatory HAUSGARTEN, which constitutes the first, and until now only open-ocean long-term station in a polar region. Virtually undisturbed sediment samples have been taken using a video-guided multiple corer (MUC) at 13 HAUSGARTEN stations along a bathymetric (1,000 - 4,000 m water depth) and a latitudinal transect in 2,500 m water depth as well as two stations at 230 and 1,200 m water depth within the framework of the KONGHAU project. Various biogenic sediment compounds were analyzed to estimate the input of organic matter from phytodetritus sedimentation, benthic activities (e.g. bacterial exoenzymatic activity), and the total biomass of the smallest sediment-inhabiting organisms (size range: bacteria to meiofauna).为探测并追踪北大西洋北部与北冰洋中部过渡带的大规模环境变化影响，并通过实验确定控制深海生物多样性的关键因素，阿尔弗雷德·魏格纳极地与海洋研究所（Alfred-Wegener-Institute for Polar and Marine Research, AWI）建立了深海长期观测站HAUSGARTEN——该观测站是极地地区首个且截至目前唯一的远洋长期观测站位。在KONGHAU项目框架下，研究团队沿覆盖1000至4000米水深的地形梯度断面以及水深2500米的纬度梯度断面，在13个HAUSGARTEN站位采集样品；同时在另外2个水深分别为230米和1200米的站位，采用视频引导式多管取样器（video-guided multiple corer, MUC）获取了几乎未受扰动的沉积物样本。研究人员对多种生物成因沉积物组分展开分析，以估算浮游植物碎屑沉降、底栖生物活动（如细菌胞外酶活性）带来的有机质输入量，以及栖息于沉积物中的最小型生物（尺寸范围：细菌至小型底栖动物）的总生物量。