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Personal profile

Curriculum

Degrees:
Ph.D., Marine Ecology, University of Aarhus, DK,1984
Dr.Sc., Biogeochemistry, Odense University, DK,1996

Employment:
Assistant Lecturer, Institute of Ecology and Genetics, University of Aarhus, DK,1984
Assistant Professor, Institute of Biology, Odense University, DK,1985-1989
Associate Professor, Institute of Biology, University of Southern Denmark, DK,1989-present

Administration:
Institute Chairman, Institute of Biology, Odense University, DK, 1991. Member of the board of directors, Institute of Biology, Odense University, DK,1993-1999. Member of the Science study board, University of Southern Denmark, DK, 2000-2010. Member of the board of directors, Wadden Sea Centre, Ribe, Denmark, 2000-present. Member of the board of directors, Institute of biology, University of Southern Denmark, DK, 2006-2010. Member of CEMIT (Centre for Energy and Environmentally Efficient Technologies), University of Southern Denmark, DK, 2008-present

Major research projects:
SWAP – Sylter Wattenmeer Austausch Prozesse (BMFT-financed) (2.7 mill. kr.). Partner-coordinator and steering committee member,1990-1995. SMP – Strategic environmental research (Ministry of Environment financed) (1.9 mill. kr.). Partner-coordinator and steering committee member,1993-1996. SCP – Scientific Cooperation Program (DANIDA-financed) (2.0 mill. kr.). Partner-coordinator, 1995-2000. ISLED - Influence of rising Sea Level on Ecosystem Dynamics of salt marshes (EU-financed) (2.1 mill. kr.). Partner coordinator and steering committee member, 1998-2000. PUMPSEA - Peri-Urban Mangrove forests as filters and potential Phytoremediators of domestic Sewage in East Africa (EU-financed) (1.7 mill. kr.). Partner-coordinator and steering committee member, 2005-2008. Frame Fundings from the Danish Science Research Council (4 x 3 years) (ca. 1 mill. kr. per 3 years). Coordinator from 2002 to 2008, 1996-2008. REELGRASS - Key parameters and processes affecting the re-establishment of eelgrass in estuaries and coastal waters (financed by Danish Agency for Science) (10.5 mill. kr.). Work package leader and steering Committee member, 2008-2011. MARINVA - Marine invasive species (financed by the Danish Council for Independent Research) (0.1 mill. kr.). Partner, 2009-2011. Large Project - Stress thresholds for deterioration and recovery of shallow freshwater and marine macrophyte communities; the role of sediment processes (financed by the Danish council for Independent Research) (5.5 mill. kr.). Coordinator, 2010-2012.

Expeditions/visits:
Phuket Marine Biological Center, Phuket, Thailand (12 visits of about 1.5 months duration each), 1981-2010. Marine Sciences Research Center, State University of New York, New York, USA (6 months), 1988. National Institute of Oceanography, Karachi, Pakistan (1 month), 1990. School of Oceanography, University of Washington, Seattle, USA (12 months), 1993-1994. Australian Institute of Marine Science, Townsville, Australia (10 months), 2002-2003. University of Dar es Salaam, Tanzania (5 visits of about 1 month), 2005-2008

Teaching:
Teaching assistant in elementary genetics, University of Aarhus, DK, 1979-1980. Teaching assistant on graduate summer courses in marine biology, University of Aarhus, DK, 1980. Teacher on graduate courses in population ecology, University of Aarhus, DK, 1983. Organizer of and teacher on graduate and postgraduate summer courses in marine biology, University of Aarhus, DK, 1983-1984. Lecturer in biology, University of Southern Denmark, DK, 1985-present. Supervisor M.Sc. (5 present and 65 graduated students),1985-present. Supervisor Ph.D. (2 present and 10 graduated students), 1985 present

Editorial:
Review editor for the journal ”Aquatic Microbial Ecology”, 1995-2006. Editor of the AGU book “Interactions between macro- and microorganisms in marine sediments”, 2003-2005. Review editor for the journal “Marine Ecology Progress Series”, 2007-present. Member of Editorial Board of "Wetlands Ecology and Management", 2008-present. Member of Editorial Board of "International Journal of Oceanography", 2010-present.

Society Memberships:
American Society of Limnology and Oceanography; International Polychaete Association; The Association of Danish Marine Biologists; The Geochemical Society; International Association for Sediment Water Science, IASWS; Nereis-Park

Research areas

My research interests are primarily focused on the biogeochemistry and microbial ecology of coastal marine sediments inhabited by burrowing invertebrates and rooted macrophytes. I am currently involved in the following projects:

Infaunal stimulation of organic matter degradation in marine sediments. It is well known that benthic infauna is capable of stimulating the microbial decay of organic matter in sediments. However, the underlying mechanisms for this stimulation are not clearly elucidated. The questions I seek to answer in this respect are: 1. Do infaunal animals stimulate microbial activity directly by grazing or competing with them? 2. Do infaunal animals speed up microbial processes in deep sediment layers indirectly by introducing efficient electron acceptors, such as oxygen, via irrigation activities? 3. Do infaunal animals stimulate microbial activity indirectly by changing the diffusion geometry in anoxic sediment when they create a mosaic of sediment-water interfaces? Species of the common polychaete genus Nereis are excellent model organisms for this purpose. The massive colonization in recent years of the invasive polychaete Marenzelleria viridis in our coastal sediments has raised a number of new and important questions: 1. Vil this new species outcompete native species, such as Nereis diversicolor? 2. How does this new species affect the sediment biogeochemistry? I attempt to answer these questions in the years to come.

Anaerobic mineralization of carbon and nitrogen in marine sediment. Consortia of bacteria mediate anaerobic degradation of organic matter in marine sediments. Hydrolyzing bacteria splits large molecules into smaller organic units, which are degraded to organic monomers (e.g. amino acids) and short chain organic acids (e.g. acetate) by fermenting bacteria. Finally, the anaerobic respirers mineralize these small molecules to carbon dioxide and inorganic nutrients. My questions here are then: 1. Which organisms and processes are responsible for the release of carbon dioxide and ammonium during microbial degradation of organic matter in anoxic sediment? 2. How fast can the microbial community adapt to changes in the composition and quality of organic supplies? I attempt to solve these questions by the use of anaerobic sediment incubations.

Partitioning of microbial respiration processes in bioturbated and rooted intertidal sediments. The terminal microbial respiration in sediments may occur with oxygen, manganese, iron, nitrate and sulfate as electron acceptors. Much work has been done to quantify each of these respiration processes and to determine the partitioning between them in oceanic sediments. Much less is known about these processes in highly disturbed intertidal sediments, such as Spartina marshes and mangrove forests. My objectives for this work is to determine the role of burrowing animals (various crab species) and roots (eelgrass, cordgrass and mangrove trees) for the rates and partitioning of processes, while attempting to answer the following questions: 1. How do animals and roots control the vertical distribution of respiration with the various electron acceptors? 2. What is the temporal variability in the distribution of respiration processes and how is that related to animal and root activity?

In the project, REELGRASS, our aim is to explain why eelgrass is not recovering and recolonizing areas where is was present in the past. The conditions with respect to water quality should not any more hinder such recolonization. My contribution to the project is to determine the if benthic animals hampers the recolonization by grazing on roots and seeds, or if these animals actually facilitate recruitning of eelgrass by oxidizing the sediment.

Research areas

  • Biodiversity
  • Biogeochemistry
  • Bioturbation
  • Benthic fauna
  • Polychaetes
  • Marine biology
  • Oxygen depletion
  • Nitrogen
  • Mangrove
  • Marine ecology
  • Microbial processes and substance cycles
  • Environmental biology
  • Nutrients
  • Sediment-animal interactions
  • Substance turnover
  • Tropical ecosystems
  • Ecology

Fingerprint Dive into the research topics where Erik Kristensen is active. These topic labels come from the works of this person. Together they form a unique fingerprint.

  • 5 Similar Profiles
bioturbation Agriculture & Biology
fjord Earth & Environmental Sciences
sediments Agriculture & Biology
Polychaeta Agriculture & Biology
sediment Earth & Environmental Sciences
marina Earth & Environmental Sciences
fauna Agriculture & Biology
turbidity Earth & Environmental Sciences

Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Research Output 1985 2019

31 Downloads (Pure)

Fertilizer-derived N in opportunistic macroalgae after flooding of agricultural land

Thorsen, S. W., Kristensen, E., Valdemarsen, T., Flindt, M. R., Quintana, C. O. & Holmer, M., 1. Jan 2019, In : Marine Ecology Progress Series. 616, p. 37-49

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
managed realignment
algae
macroalgae
agricultural land
flooding

Stable C and N Isotope Composition of Primary Producers and Consumers Along an Estuarine Salinity Gradient: Tracing Mixing Patterns and Trophic Discrimination

Kristensen, E., Quintana, C. O. & Valdemarsen, T., Jan 2019, In : Estuaries and Coasts. 42, 1, p. 144-156

Research output: Contribution to journalJournal articleResearchpeer-review

fjord
Mya arenaria
isotopes
organic matter
isotope
88 Downloads (Pure)

Benthic macrofauna bioturbation and early colonization in newly flooded coastal habitats

Valdemarsen, T., Quintana, C. O., Thorsen, S. W. & Kristensen, E., 2018, In : PLOS ONE. 13, 4, 21 p., e0196097.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
bioturbation
Ecosystem
Soils
Polychaeta
habitats
10 Downloads (Pure)

Carbon oxidation and bioirrigation in sediments along a Skagerrak−Kattegat−Belt Sea depth transect

Kristensen, E., Røy, H., Debrabant, K. & Valdemarsen, T., Oct 2018, In : Marine Ecology Progress Series. 604, p. 33-50

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
transect
oxidation
sediments
carbon
shallow water

Functional Performance of Three Invasive Marenzelleria Species Under Contrasting Ecological Conditions Within the Baltic Sea

Quintana, C. O., Raymond, C., Nascimento, F. J. A., Bonaglia, S., Forster, S., Gunnarsson, J. S. & Kristensen, E., Sep 2018, In : Estuaries and Coasts. 41, 6, p. 1766–1781

Research output: Contribution to journalJournal articleResearchpeer-review

Baltic Sea
invasive species
Arctia
sediments
salinity

Activities 1998 2017

Biogeosciences Discussions (Journal)

Erik Kristensen (Peer reviewer)
15. Nov 2017

Activity: Editorial work and peer reviewPeer review of manuscriptsResearch

Gyldensteen Strand. Fra agerland til kystlagune

Erik Kristensen (Guest lecturer)
27. Oct 2017

Activity: Talks and presentationsTalks and presentations in private or public companies

Scientific Reports (Journal)

Erik Kristensen (Peer reviewer)
21. Aug 2017

Activity: Editorial work and peer reviewPeer review of manuscriptsResearch

University of Maryland

Erik Kristensen (Visiting researcher)
13. Aug 201716. Aug 2017

Activity: Visiting another research institution

Science Advances (Journal)

Erik Kristensen (Peer reviewer)
1. Jul 2017

Activity: Editorial work and peer reviewPeer review of manuscriptsResearch

Press / Media

Den politiske tale er et redskab - ikke et kunstværk

Erik Kristensen

14/09/2019

1 Media contribution

Press/Media: Press / Media

Små kommuner vil have hjælp til kontrol af havbrug

Erik Kristensen

16/10/2018

1 Media contribution

Press/Media: Press / Media

Små kommuner vil have hjælp til kontrol af havbrug

Erik Kristensen

16/10/2018

1 Media contribution

Press/Media: Press / Media

Små kommuner vil have hjælp til kontrol af havbrug

Erik Kristensen

15/10/2018

1 Media contribution

Press/Media: Press / Media