Biochemical investigation of multicorer sediment profile PS80/194-2

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内大规模环境变化的影响，并通过实验明确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——该站是极地地区首个且迄今唯一的开阔大洋长期观测站。在KONGHAU项目框架下，研究团队采用视频引导式多管采样器（multiple corer, MUC），在13个HAUSGARTEN站位采集了近乎未受扰动的沉积物样品；这些站位涵盖沿1000至4000米水深的地形断面站位、沿2500米水深的纬度断面站位，以及另外两个分别位于230米与1200米水深的站位。研究人员对多种生物成因沉积物组分进行了分析，以估算浮游植物碎屑沉降带来的有机质输入量、底栖生物活动（如细菌胞外酶活性），以及栖息于沉积物中的最小体型生物（尺寸范围：细菌至小型底栖动物（meiofauna））的总生物量。