Advanced search
1 file | 2.12 MB

Local effects of large food-falls on nematode diversity at an arctic deep-sea site : results from an in situ experiment at the deep-sea observatory HAUSGARTEN

Author
Organization
Abstract
To study the response of the smaller benthic biota to larger food-falls and their possible effects on the biodiversity at the deep seafloor, we deployed the halves of a sagittally bisected porpoise (1.3 m in length: each half approximately 18 kg) at 2500 m and 5400 m water depth at the LTER (Long-Term Ecological Research) observatory HAUSGARTEN in the eastem Fram Strait. Five weeks after the porpoise deployment, sediments beneath the carcasses and at different distances (0, 20, 40 cm) from these artificial food-falls were sampled with push-corers handled by a Remotely Operated Vehicle. The samples provided empirical evidence for a quick response by sediment-inhabiting bacteria and metazoan meiofauna to the carcasses at both water depths. Compared to control sediments, the substantial pulse of organic matter also led to generally increased meiofauna/nematode densities around the artificial food-falls. The comparison of nematode communities in sediments affected by the carcasses with those in control sediments exhibited shifts in the structural composition and the associated trophic and functional diversity of the nematodes. Our results confirmed that the impact of large food-falls on the deep benthic community largely depend on environmental factors (water depth, alternative food sources) as well as the background species composition, i.e., the structure of the prevailing meiofauna/nematode assemblages and the composition of the necrophagous community present in the wider area.
Keywords
HAUSGARTEN, Deep sea, In situ experiment, Food-fall, Nematodes, Diversity, OXYGEN MINIMUM ZONE, COMMUNITY STRUCTURE, WHALE FALLS, ADONCHOLAIMUS-THALASSOPHYGAS, CONSUMPTION RATES, SPECIES-DIVERSITY, MARINE NEMATODES, ATLANTIC-OCEAN, MATURITY INDEX, SEDIMENTS

Downloads

  • Soltwedel et al. (2017).pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 2.12 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Soltwedel, Thomas, Katja Guilini, Eberhard Sauter, Ingo Schewe, and Christiane Hasemann. 2018. “Local Effects of Large Food-falls on Nematode Diversity at an Arctic Deep-sea Site : Results from an in Situ Experiment at the Deep-sea Observatory HAUSGARTEN.” Journal of Experimental Marine Biology and Ecology 502: 129–141.
APA
Soltwedel, T., Guilini, K., Sauter, E., Schewe, I., & Hasemann, C. (2018). Local effects of large food-falls on nematode diversity at an arctic deep-sea site : results from an in situ experiment at the deep-sea observatory HAUSGARTEN. JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, 502, 129–141.
Vancouver
1.
Soltwedel T, Guilini K, Sauter E, Schewe I, Hasemann C. Local effects of large food-falls on nematode diversity at an arctic deep-sea site : results from an in situ experiment at the deep-sea observatory HAUSGARTEN. JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY. 2018;502:129–41.
MLA
Soltwedel, Thomas, Katja Guilini, Eberhard Sauter, et al. “Local Effects of Large Food-falls on Nematode Diversity at an Arctic Deep-sea Site : Results from an in Situ Experiment at the Deep-sea Observatory HAUSGARTEN.” JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY 502 (2018): 129–141. Print.
@article{8548846,
  abstract     = {To study the response of the smaller benthic biota to larger food-falls and their possible effects on the biodiversity at the deep seafloor, we deployed the halves of a sagittally bisected porpoise (1.3 m in length: each half approximately 18 kg) at 2500 m and 5400 m water depth at the LTER (Long-Term Ecological Research) observatory HAUSGARTEN in the eastem Fram Strait. Five weeks after the porpoise deployment, sediments beneath the carcasses and at different distances (0, 20, 40 cm) from these artificial food-falls were sampled with push-corers handled by a Remotely Operated Vehicle. The samples provided empirical evidence for a quick response by sediment-inhabiting bacteria and metazoan meiofauna to the carcasses at both water depths. Compared to control sediments, the substantial pulse of organic matter also led to generally increased meiofauna/nematode densities around the artificial food-falls. The comparison of nematode communities in sediments affected by the carcasses with those in control sediments exhibited shifts in the structural composition and the associated trophic and functional diversity of the nematodes. Our results confirmed that the impact of large food-falls on the deep benthic community largely depend on environmental factors (water depth, alternative food sources) as well as the background species composition, i.e., the structure of the prevailing meiofauna/nematode assemblages and the composition of the necrophagous community present in the wider area.},
  author       = {Soltwedel, Thomas and Guilini, Katja and Sauter, Eberhard and Schewe, Ingo and Hasemann, Christiane},
  issn         = {0022-0981},
  journal      = {JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY},
  keywords     = {HAUSGARTEN,Deep sea,In situ experiment,Food-fall,Nematodes,Diversity,OXYGEN MINIMUM ZONE,COMMUNITY STRUCTURE,WHALE FALLS,ADONCHOLAIMUS-THALASSOPHYGAS,CONSUMPTION RATES,SPECIES-DIVERSITY,MARINE NEMATODES,ATLANTIC-OCEAN,MATURITY INDEX,SEDIMENTS},
  language     = {eng},
  pages        = {129--141},
  title        = {Local effects of large food-falls on nematode diversity at an arctic deep-sea site : results from an in situ experiment at the deep-sea observatory HAUSGARTEN},
  url          = {http://dx.doi.org/10.1016/j.jembe.2017.03.002},
  volume       = {502},
  year         = {2018},
}

Altmetric
View in Altmetric
Web of Science
Times cited: