Royal Netherlands Institute for Sea Research
Royal Netherlands
Institute for Sea Research
Phone number
+31 (0)113 57 7326
Visiting Postdoc
Universiteit Gent
Karline Soetaert
  • Pulse-chase experiments with stable isotopes (SI)
  • Compound-specific isotope analysis (fatty acids, amino acids)
  • Linear inverse modelling of benthic food-webs
  • Absorbance and fluorescence measurements of DOM (CDOM, FDOM)
  • Annotation of still images and processing of video material

Dr. Tanja Stratmann

Visiting Postdoc

(photo courtesy: ROV Kiel 6000, Geomar, Kiel, Germany)

Research interests

  •            Carbon cycling in polar waters and sea ice
  •       Structure and stability of deep-sea food webs
  •       Nutrient and oxygen fluxes of benthic megafauna (e.g. Porifera, Holothuroidea)
  •       Environmental impact of deep-sea mining
  •       Deep-sea diversity and ecology

Linked news

Tuesday 29 October 2019
Largest mapping of breathing ocean floor key to understanding global carbon cycle
Marine sediments play a crucial role in the global carbon cycle due to the oxygen consumption and CO2 respiration of the organisms that live in and on the ocean floor. To help predict the changing contribution of this respiration to the carbon cycle…
Thursday 27 September 2018
Diepzeemijnbouw veroorzaakt langdurige schade aan het ecosysteem
[English below Dutch] Het winnen van mangaanknollen in de diepzee levert langdurige milieuschade op. Dat concludeert NIOZ-onderzoekster Tanja Stratmann in haar proefschrift 'Benthic ecosystem response to polymetallic nodule extraction in the deep…
Tuesday 06 June 2017
Short-term effects of deep-sea mining waste on microbes and meiofauna at the seafloor
The addition of waste particles from deep-sea mining (iron ore mine tailings) affected the activity of nematodes and the microbial community in microcosm experiments with natural sediments collected at 200m depth in the Hardanger fjord (Norway).…

NIOZ publications

  • 2021
    Stratmann, T.; Soetaert, K.; Kersken, D.; van Oevelen, D. (2021). Polymetallic nodules are essential for food-web integrity of a prospective deep-seabed mining area in Pacific abyssal plains. NPG Scientific Reports 11(1): 12238.
  • 2020
    de Jonge, D.S.W.; Stratmann, T.; Lins, L.; Vanreusel, A.; Purser, A.; Marcon, Y.; Rodrigues, C.F.; Ravara, A.; Esquete, P.; Cunha, M.R.; Simon-Lledó, E.; van Breugel, P.; Sweetman, A.K.; Soetaert, K.; van Oevelen, D. (2020). Abyssal food-web model indicates faunal carbon flow recovery and impaired microbial loop 26 years after a sediment disturbance experiment. Prog. Oceanogr. 189: 102446.
    Kazanidis, G.; Orejas, C.; Borja, A.; Kenchington, E.; Henry, L.-A.; Callery, O.; Carreiro-Silva, M.; Egilsdottir, H.; Giacomello, E.; Grehan, A.; Menot, L.; Morato, T.; Ragnarsson, S.A.; Rueda, J.L.; Stirling, D.; Stratmann, T.; van Oevelen, D.; Palialexis, A.; Johnson, D.; Roberts, J.M. (2020). Assessing the environmental status of selected North Atlantic deep-sea ecosystems. Ecol. Indic. 119: 106624.
    Lund-Hansen, L.C.; Bendtsen, J.; Stratmann, T.; Tonboe, R.; Olsen, S.M.; Markager, S.; Sorrell, B.K. (2020). Will low primary production rates in the Amundsen Basin (Arctic Ocean) remain low in a future ice-free setting, and what governs this production? J. Mar. Syst. 205: 103287.
    Stratmann, T.; van Oevelen, D.; Martinez Arbizu, P.; Wei, C.L.; Liao, J.-X.; Cusson, M.; Scrosati, R.; Archambault, P.; Snelgrove, P.; Ramey-Balci, P.; Burd, B.J.; Kenchington, E.; Belley, R.; Soetaert, K. (2020). The BenBioDen database, a global database for meio-, macro- and megabenthic biomass and densities. Scientific Data 7: 206.
  • 2019
    Stratmann, T.; Soetaert, K.; Wei, C.L.; Lin, Y.-S.; Van Oevelen, D. (2019). The SCOC database, a large, open, and global database with sediment community oxygen consumption rates. Scientific Data 6: article number: 242.
    Sweetman, A.K.; Smith, C.R.; Shulse, C.N.; Maillot, B.; Lindh, M.; Church, M.J.; Meyer, K.S.; van Oevelen, D.; Stratmann, T.; Gooday, A.J. (2019). Key role of bacteria in the short-term cycling of carbon at the abyssal seafloor in a low particulate organic carbon flux region of the eastern Pacific Ocean. Limnol. Oceanogr. 64(2): 694-713.
  • 2018
    Brown, A.; Hauton, C.; Stratmann, T.; Sweetman, A.; Van Oevelen, D.; Jones, D.O.B. (2018). Metabolic rates are significantly lower in abyssal Holothuroidea than in shallow-water Holothuroidea. Royal Society Open Science 5: 172162.
    Stratmann, T. (2018). Benthic ecosystem response to polymetallic nodule extraction in the deep sea. PhD Thesis. Ghent University: Ghent. ISBN 9789082561159. XXV, 351 pp.
    Stratmann, T.; Lins, L.; Purser, A.; Rodrigues, C.F.; Ravara, A.; Cunha, M.R.; Simon-Lledó, E.; Jones, D.O.B.; Sweetman, A.K.; Köser, K.; Van Oevelen, D. (2018). Abyssal plain faunal carbon flows remain depressed 26 years after a simulated deep-sea mining disturbance. Biogeosciences 15(13): 4131-4145.
    Stratmann, T.; Mevenkamp, L.; Sweetman, A.K.; Vanreusel, A.; van Oevelen, D. (2018). Has phytodetritus processing by an abyssal soft-sediment community recovered 26 years after an experimental disturbance? Front. Mar. Sci. 5: 59.
    Stratmann, T.; Voorsmit, I.; Gebruk, A.; Brown, A.; Purser, A.; Marcon, Y.; Sweetman, A.K.; Jones, D.O.B.; Van Oevelen, D. (2018). Recovery of Holothuroidea population density, community composition, and respiration activity after a deep-sea disturbance experiment. Limnol. Oceanogr. 63(5): 2140-2153.
  • 2017
    Jones, D.O.B.; Kaiser, S.; Sweetman, A.K.; Smith, C.R.; Menot, L.; Vink, A.; Trueblood, D.; Greinert, J.; Billett, D.S.M.; Martinez Arbizu, P.; Radziejewska, T.; Singh, R.; Ingole, B.; Stratmann, T.; Simon-Lledó, E.; Durden, J.M.; Clack, M.R. (2017). Biological responses to disturbance from simulated deep-sea polymetallic nodulemining. PLoS One 12(2): e0171750.
    Mevenkamp, L.; Stratmann, T.; Guilini, K.; Moodley, L.; Van Oevelen, D.; Vanreusel, A.; Westerlund, S.; Sweetman, A.K. (2017). Impaired short-term functioning of a benthic community from a deep Norwegian Fjord following deposition of mine tailings and sediments. Front. Mar. Sci. 4(169): 1-16.
    Stratmann, T.; Lund-Hansen, L.C.; Sorrell, B.K.; Markager, S. (2017). Concentrations of organic and inorganic bound nutrients and chlorophyll a in the Eurasian Basin, Arctic Ocean, early autumn 2012. Regional Studies in Marine Science 9: 69-75.
  • 2015
    Lund-Hansen, L.C.; Markager, S.; Hancke, K.; Stratmann, T.; Rysgaard, S.; Ramløv, H.; Sorrell, B.K. (2015). Effects of sea-ice light attenuation and CDOM absorption in the water below the Eurasian sector of central Arctic Ocean (>88°N). Pol. Res. 34: 23978.

Linked projects

MIDAS_Managing Impacts of Deep-seA reSource exploitation
Dick van Oevelen
European Community
Project duration
1 Nov 2013 - 16 Feb 2018
MIDAS_Managing Impacts of Deep-seA reSource exploitation
Dick van Oevelen
European Community
Project duration
1 Nov 2013 - 16 Feb 2018
Role of deep-sea sponges on carbon and nitrogen flows in deep-sea food webs
Tanja Stratmann
The Royal Netherlands Academy of Arts and Sciences
Project duration
1 Jan 2017 - 30 Jun 2017