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Chlorophyll a, Pheopigments and Phospholipids of sediment core CD86_08_BC5

Publication Date
DOI: 10.1594/pangaea.400502
  • 08_Bc5
  • Adepd
  • Atlantic Data Base For Exchange Processes At The Deep Sea Floor
  • Box Corer
  • Cd86
  • Cd86_08_Bc5
  • Charles Darwin
  • Chlorophyll A
  • Ne Atlantic
  • Phaeopigments
  • Phospholipids
  • Biology
  • Chemistry
  • Earth Science
  • Ecology
  • Geography


poster_FABInew THE ROLE OF BIOLOGICAL DISTURBANCE IN MAINTAINING DEEP-SEA BIODIVERSITY AWI Challenge The most striking finding in biological oceanography over the past decades was the discovery of an extremely high biodiversity in the deep-sea realm. The Intermediate Disturbance Theory (Connell, 1978) and the Spatial Temporal Mosaic Theory (Grassle, 1989) implicate the impact of small-scale, recurring biological disturbances in providing habitat complexity of deep-sea sediments. Such disturbances would be effective in maintaining co-existence of large numbers of species by contributing to niche diversification. By means of in situ caging experiments, this study aims at testing the hypothesis that small-scale heterogeneity in sediment structure and physico-chemical properties, created by larger motile benthic deep-sea species are important in promoting high biodiversity in small-sized organisms at the deep-sea floor. Fabiane Gallucci*, Gustavo Fonseca & Thomas Soltwedel Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany.*[email protected] 1cm 2cm 3cm 4cm 5cm Meiofauna (inds/10cm²) 0 4 8 12 16 20 Chlorophyll-a (µg/cm²) 0.0 0.2 0.60.4 FDA (nmol/ml h) 1.2 2.0 2.81.6 2.4 3.2 Phaeopigments (µg/cm²) 0.2 0.6 1.00.4 0.8 1.2 Phospholipids (nmol/cm²) 2.0 3.01.5 2.5 3.5 Preliminary Results Study Design By means of the deep-diving Remotely Operated Vehicle “VITOR 6000”, six plastic cages were deployed at the seafloor at 2500 m water depth and were sampled after 4 years. One push-core was taken from under each cage ( ) and, as a control ( ), one push-core was sampled beside each cage. From each push-core, 6 subsamples were taken for: 1) Meiofauna (focus on nematode communities), 2) Chloroplastic pigments (chl.a and phaeopigments, indicating the availability of organic material), 3) Phospolipids (indicating total microbial biomass), 4) Fluorecein-di-acetate (FDA, estimating the potential

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