Leni Hauss

Phone: 0431 600 4404
Fax: 0431 600 4402
Room: 231
e-mail: hhauss(at)geomar.de 

GEOMAR | Helmholtz-Zentrum für Ozeanforschung Kiel
Experimentelle Ökologie I (Nahrungsnetze)
Düsternbrooker Weg 20
D-24105 Kiel

born May 2, 1983 in Münster; married, two children (*2014 & 2016)




Education and Employment

  • since 02/2016: DAAD Postdoctoral fellowship at IMR Bergen, Norway: "High-resolution analysis of cod egg and larvae distribution in the hydrographically dynamic Lofoten spawning area"
  • 2012-2015: Postdoc in SFB 754 (subproject B8)
  • 2008-2012: Ph.D. student in SFB 754 (subproject B2)
  • 2007: Diploma Thesis, Institute for Hydrobiology and Fisheries Science, University of Hamburg
  • 2006: Syddansk Universitet, Odense, Denmark
  • 2004-2008: Graduate Studies (Biological Oceanography, Zoology, Toxicology), Christian-Albrechts-University Kiel
  • 2002-2004: Undergraduate Studies (Biology), Christian-Albrechts-University Kiel

Scientific Interests

  • Impact of oxygen minimum zones (OMZs) on zooplankton in the Eastern Tropical North Atlantic and Eastern Tropical South Pacific: distribution and metabolism
  • Nutrient stoichiometry in marine food webs: N sources to the pelagic food web of the tropical ocean, N:P supply influencing phytoplankton and the phytoplankton-zooplankton link
  • Ecology of small pelagic fishes: early life stages and reproduction
  • Optical and acoustic observation methods in zooplankton and micronekton ecology
  • Ecology of mesoscale eddies


  • RECONN2: Resolving Trophodynamic Consequences of Climate Change (2007-2008)
  • SFB 754 B2: Pelagic community responses to changes in nutrient stoichiometry (2008-2011)
  • SFB 754 B8: The role of zooplankton in N-, P- and C- cycling and for the oxygen budget of tropical OMZs (2012-current)
  • FutureOcean CP1341: Biogeochemistry and Ecology of Oxygen Depleted Eddies in the Eastern Tropical Atlantic (2013-2015)
  • DAAD-funded postdoctoral research project “High-resolution analysis of cod egg and larvae distribution in the hydrographically dynamic Lofoten spawning area”
  • BMBF CUSCO:Coastal Upwelling System in a Changing Ocean
  • EU H2020 iAtlantic


  • Alkor 320, May 2008. Ichthyoplankton and fishery survey, Baltic
  • Meteor 77/3, January 2009. Eastern Tropical South Pacific (Guayaquil-Lima)
  • Meteor 80/2, December 2009. Eastern Tropical North Atlantic (Mindelo-Dakar)
  • Meteor 83/1, November 2010. Eastern Tropical North Atlantic (Las Palmas-Mindelo)
  • Alkor 371, April 2011. Ichthyoplankton and fishery survey, Baltic
  • Islandia 00412_1 to Islandia 01212_1, August to October 2012, eight day/night trips in the vicinity of Cape Verde
  • Maria S. Merian 22, November 2012. Eastern Tropical North Atlantic (Mindelo-Mindelo)
  • Meteor 93, February 2013. Peruvian Upwelling (Lima-Panama)
  • Meteor 97, June 2013. Eastern Tropical North Atlantic (Mindelo-Fortaleza)
  • G.O. Sars, 8 days in March 2016. Acoustics/Fisheries Survey, Lofoten/Vesterålen
  • H.U. Sverdrup, 6 days in April 2016. Acoustics/Cod egg survey, Lofoten
  • Johan Hjort, 4 days in April 2016. Cod egg survey, Lofoten
  • Meteor 138, June/July 2017. Eastern Tropical South Pacific (Lima-Cristobal)  
  • Poseidon 520, February 2018. Cape Verde archipelago
  • Poseidon 532, February 2019. Cape Verde archipelagoand eddy survey


  1. Lombard, Fabien, et al. (2019) Globally consistent quantitative observations of planktonic ecosystems." Frontiers in Marine Science 6 (2019): 196.
  2. Hoving H J T., Christiansen S, Fabrizius E, Hauss H, Kiko R, Linke P & Körtzinger A (2019). The Pelagic In situ Observation System (PELAGIOS) to reveal biodiversity, behavior and ecology of elusive oceanic fauna. Ocean Science
  3. Döring J, Hauss H, Haslob H (2018) Spatial and seasonal variability in reproductive investment of Baltic sprat. Fisheries Research 204:49-60  
  4. Kiko R, Biastoch A, Brandt P, Cravatte S, Hauss H, Hummels R, Kriest I, Marin F, McDonnell A, Oschlies A (2017) Biological and physical influences on marine snowfall at the equator. Nature Geoscience, 10, 852.
  5. Singh A, Bach LT, Fischer T, Hauss H, Kiko R, Paul AJ, Stange P, Vandromme P, Riebesell U (2017) Niche construction by non‐diazotrophs for N2 fixers in the eastern tropical North Atlantic Ocean. Geophysical Research Letters 44:6904–6913  
  6. Karstensen J, Schütte F, Pietri A, Krahmann G, Fiedler B, Grundle D, Hauss H, Körtzinger A, Löscher CR, Testor P (2017) Upwelling and isolation in oxygen-depleted anticyclonic modewater eddies and implications for nitrate cycling. Biogeosciences 14:2167  
  7. Schütte F, Karstensen J, Krahmann G, Hauss H, Fiedler B, Brandt P, Visbeck M, Körtzinger A (2016) Characterization of “dead-zone” eddies in the eastern tropical North Atlantic. Biogeosciences 13:5865-5881.
  8. Biard T, Stemmann L, Picheral M, Mayot N, Vandromme P, Hauss H, Gorsky G, Guidi L, Kiko R, Not F (2016) In situ imaging reveals the biomass of giant protists in the global ocean. Nature 532:504-507
  9. Schütte F, Karstensen J, Krahmann G, Hauss H, Fiedler B, Brandt P, Visbeck M, Körtzinger A (2016) Characterization of “dead-zone” eddies in the eastern tropical North Atlantic. Biogeosciences 13:5865-5881
  10. Fiedler B, Grundle D, Schütte F, Karstensen J, Löscher CR, Hauss H, Wagner H, Loginova A, Kiko R, Silva P, Körtzinger A (2016) Oxygen Utilization and Downward Carbon Flux in an Oxygen-Depleted Eddy in the Eastern Tropical North Atlantic. Biogeosciences 13: 5633-5647.
  11. Czerny JMS, Hauss H, Löscher C, Riebesell U (2016) Dissolved N:P ratio changes in the eastern tropical North Atlantic: impact on phytoplankton growth and community structure. Marine Ecology Progress Series 545:49-62
  12. Meyer J, Löscher C, Neulinger SC, Reichel A, Loginova AN, Borchard C, Schmitz R A, Hauss H, Kiko R,  Riebesell U (2016) Changing nutrient stoichiometry affects phytoplankton production, DOP build up and dinitrogen fixation – a mesocosm experiment in the eastern tropical North Atlantic. Biogeosciences 12 (13). pp. 9991-10029
  13. Hauss H, Christiansen S, Schütte F, Kiko R, Edvam Lima M, Rodrigues E, Karstensen J, Löscher CR, Körtzinger A, Fiedler B (2016) Dead zone or oasis in the open ocean? Zooplankton distribution and migration in low-oxygen modewater eddies. Biogeosciences 13:1977-1989
  14. Löscher C, Fischer M, Neulinger S, Fiedler B, Philippi M, Schütte F, Singh A, Hauss H, Karstensen J, Körtzinger A (2015) Hidden biosphere in an oxygen-deficient Atlantic open ocean eddy: future implications of ocean deoxygenation on primary production in the eastern tropical North Atlantic. Biogeosciences 12: 7467-7482. DOI 10.5194/bg-12-7467-2015
  15. Kiko R, Hauss H, Buchholz F, Melzner F (2016) Ammonium excretion and oxygen respiration of tropical copepods and euphausiids exposed to oxygen minimum zone conditions. Biogeosciences 13:2241-2255
  16. Kiko R, Hauss H, Dengler M, Sommer S, Melzner F (2015) The squat lobster Pleuroncodes monodon tolerates anoxic “dead zone” conditions off Peru. Marine Biology: 1-9 doi 10.1007/s00227-015-2709-6
  17. Kalvelage T, Lavik G, Jensen MM, Revsbech NP, Schunck H, Löscher C, Desai DK, Hauss H, Kiko R, LaRoche J, Schmitz-Streit R & Kuypers MMM (2015) Aerobic microbial respiration in oceanic oxygen minimum zones. PLoS ONE: 10(7). DOI:10.1371/journal.pone.0133526
  18. Sandel, V., Kiko, R., Brandt, P.,  Dengler, M., Stemmann, L.,  Vandromme, P.,  Sommer, U. and Hauss, H. (2015): Nitrogen fuelling of the pelagic food web of the Tropical Atlantic. PLoS ONE doi  10.1371/journal.pone.0131258
  19. Loginova AN, Borchard C, Meyer J, Hauss H, Kiko R, Engel A(2015) Effects of nitrate and phosphate supply on chromophoric and fluorescent dissolved organic matter in the Eastern Tropical North Atlantic: a mesocosm study, Biogeosciences 12, 6897-6914, DOI10.5194/bgd-12-7209-2015.
  20. Engel A, Borchard C, Loginova AN, Meyer J,Hauss H, Kiko R (2015) Effects of varied nitrate and phosphate supply on polysaccharidic and proteinaceous gel particles production during tropical phytoplankton bloom experiments Biogeosciences 12, 5647-5665, doi:10.5194/bg-12-5647-2015
  21. Löscher C, Bange H, Schmitz R, Callbeck C, Engel A, Hauss H, Kanzow T, Kiko R, Lavik G, Loginova A, Melzner F, Neulinger SC, Pahlow M, Riebesell U, Schunck H, Thomsen S and Wagner H (2015) Water column biogeochemistry of oxygen minimum zones in the eastern tropical North Atlantic and eastern tropical South Pacific Oceans. Biogeosciences Discussions 12: 4495-4556
  22. Hauss H, Franz JMS, Hansen T, Struck U and Sommer U (2013) Relative inputs of upwelled and atmospheric nitrogen to the eastern tropical North Atlantic food web: Spatial distribution of δ15N in meso zooplankton and relation to dissolved nutrient dynamics. Deep-Sea Research I 75: 135–145 doi: 10.1016/j.dsr.2013.01.010
  23. Franz, J.M.S., Hauss, H., Sommer, U., Dittmar., T. and Riebesell, U. (2012) Production, partitioning and stoichiometry of organic matter under variable nutrient supply during mesocosm experiments in the tropical Pacific and Atlantic Ocean. Biogeosciences Discussions 9: 5755-5791 doi:10.5194/bgd-9-5755-2012
  24. Hauss, H., Franz, J.M.S. and Sommer U. (2012) Changes in N:P stoichiometry influence taxonomic composition and nutritional quality of phytoplanton in the Peruvian Upwelling. Journal of Sea Research 73: 74-85 doi: 10.1016/j.seares.2012.06.010
  25. Haslob, H., Hauss, H., Hinrichsen, H.-H., Voss, R., Böttcher, U. and Kraus, G. (2012) Application of the Daily Egg Production Method to Baltic sprat. Fisheries Research 127-128: 73-82 doi: 10.1016/j.fishres.2012.03.008
  26. Haslob, H., Hauss, H., Petereit, C., Clemmesen, C., Kraus, G. and Peck, M.A. (2012) Temperature effects on vital rates of different life stages and implications for population growth of Baltic sprat. Marine Biology doi: 10.1007/s00227-012-1933-6
  27. Rossoll, D., Bermúdez, R., Hauss, H., Schulz, K.G., Riebesell, U., Sommer, U. and Winder, M. (2012) Ocean acidification-induced food quality deterioration constrains trophic transfer. PloS One 7(4): e34737
  28. Hauss, H., and Peck, M.A.(2009) Comparing observed and predicted growth of larval herring (Clupea harengus): Testing individual-based model parameters. Scientia Marina 73S1: 37-45


  • Hauss H, Christiansen S, Kiko R, Lima ME, Rodrigues E, Schütte F, Grundle D, Karstensen J, Löscher C, Körtzinger A, Fiedler B: Zooplankton distribution in a hypoxic eddy in the Eastern Tropical North Atlantic - an "open ocean dead zone"? ICES Annual Science Conferece, 21.-25. September 2015, Copenhagen, Denmark
  • Hauss, H.M., Franz, J. and Sommer, U.: Virtues and Vices of shipboard mesocosms in simulating upwelling events. MESOAQUA Workshop, August 2011 
  • Hauss, H.M., Würzberg, L. and Peck, M.A.: Impacts of prey field characteristics on foraging, growth and condition of larval herring. 32nd Annual Larval Fish Conference, August 5 2008, Kiel, Germany
  • Diekmann, A.B.S., Hauss, H.M., Ziehm, S., St. John, M.A., Peck, M.A. Subtleties in Match Mismatch: Bloom dynamics, Food quality and implications for transfer to higher trophic levels. Jahrestagung der Deutschen Gesellschaft für Limnologie, 26. September 2008, Konstanz, Germany

Poster (selected)

  • Hauss, H.M., Franz J. and Sommer,U: Zooplankton response to redox-induced changes in nutrient stoichiometry: Mesocosm experiments in tropical upwelling areas. 2010 Ocean Sciences Meeting, 22-26 February 2010, in Portland, Oregon, USA 
  • Peck, M.A., Hauss, H.M. and Würzberg, L: Biophysical modeling of climate impacts on larval fish: Testing parameterizations at the individual level. Effects of Climate Change on the World's Oceans International Symposium, May 19-23, 2008, Gijón, Spain
  • Hauss, H.M., Würzberg, L., and Peck, M.A.: Larval herring growth vs.consumption: Testing IBM parameterisations at the individual level. 32nd Annual Larval Fish Conference, August 4–7 2008, Kiel, Germany
  • Hauss, H.M., Würzberg, L., and Peck, M.A.: Match-mismatch dynamics of larval herring (Clupea harengus) and their prey: Testing growth model predictions at the level of the individual. AQUASHIFT-Workshop, DGL/SIL-Jahrestagung, September 22–26 2008, Constance, Germany
  • Fiedler, B., Grundle, D., Hauss, H., Karstensen, J., Krahmann, G., Löscher, C., Schütte, F., Santos, C. and Körtzinger, A. (2013) Biogeochemistry and Ecology of Oxygen Depleted Eddies in the Eastern Tropical Atlantic. Future Ocean: Cluster Retreat 2013, 09.-10.09.2013, Schleswig, Germany.


  • Honorable mention for the J.H.S. Blaxter Award for the best student poster presentation. 32nd Annual Larval Fish Conference, August 4th – 7th 2008 Kiel, Germany