Skip to content
printicon
Staff photo Johan Wikner

Johan Wikner

My research focus on marine bacteria and their influence on the environmental status in the Sea. I am also director for Umeå Marine Sciences Center.

Contact

Works at

Affiliation
Senior lecturer (associate professor) at Department of Ecology and Environmental Sciences
Location
KB. H3, Linnaeus väg 6, Umeå, A3.18.21 Umeå universitet, 901 87 Umeå
Affiliation
Affiliated as senior lecturer (associate professor) at Umeå Marine Sciences Centre (UMF) Role: Director
Location
Norrbyn, 905 71 Hörnefors Norrbyn, 90571 Hörnefors

Role of bacterioplankton respiration in marine oxygen consumption and CO2-emission
Oxygen deficiency of coastal waters and increased emissions of carbon dioxide to the atmosphere constitute major environmental concerns for the biosphere today. Bacterioplankton respiration of organic matter accounts for more than 50 percent of the flow of carbon and oxygen in aquatic environments. Therefore improved understanding of the regulation of bacterial respiration is necessary to promote development of adequate models the marine carbon and oxygen cycles. These constitutes the basis for management of oxygen depleted bottom waters and assessments of the human impact on the CO2 -level in the atmosphere.

The project addresses the following questions:

  • Is bacterioplankton growth efficiency a function of nutrient status?
  • Do energy content and ratio of carbon, nitrogen and phosphorus influence the growth efficiency?
  • Is bacterial maintenance energy driving a significant fraction of bacterial respiration in the deep sea?
  • What fraction of marine sedimenting matter is mineralized and dissolved in the aphotic water column?
  • Are bacterioplankton dynamics associated with major meteorological events like the North Atlantic Oscillation index?

Work includes both field studies onboard research vessels at sea and experimental work in the laboratory, primarily at Umeå Marine Sciences Centre. Methodology includes current techniques to measure bacterioplankton abundance by image analysis, cryo-electronmicroscopy, DNA sequencing and bioinformatics, growth in situ by thymidine incorporation, analysis of mRNA transcripts, oxygen consumption by Optodes and CO2 emission. Chemostats constitute experimental system for some investigations. Evaluation tools include the marine database (SQL language) at UMF and the statistical software SPSS.

Research area
Marine ecology

Research project
Climate related drivers for biological oxygen consumption in the Sea

2019
Frontiers in Marine Science, Frontiers Media S.A. 2019, Vol. 6
Muelbert, Jose H.; Nidzieko, Nicholas J.; Acosta, Alicia T. R.; et al.
2019
Microbial Ecology, Springer 2019, Vol. 77, (3) : 574-586
Vikström, Kevin; Wikner, Johan
2019
Limnology and Oceanography: Methods, John Wiley & Sons 2019, Vol. 17, (3) : 179-189
Vikström, Kevin; Tengberg, Anders; Wikner, Johan
2018
Huseby, Siv; Wikner, Johan
2017
Havsmiljöinstitutets rapport, 2017:5
Ahlgren, Joakim; Rolff, Carl; Grimvall, Anders; et al.
2017
Journal of Marine Systems, Vol. 170 : 22-30
Ahlgren, Joakim; Grimvall, Anders; Omstedt, Anders; et al.
2016
Havet: om miljötillståndet i svenska havsområden. 2015/2016, Göteborg: Havs- och vattenmyndigheten 2016 : 25-28
Andersson, Agneta; Wikner, Johan
2016
Marine Ecology Progress Series, Oldendorf/Luhe: 2016, Vol. 561 : 17-29
Båmstedt, Ulf; Wikner, Johan
2015
Second Assessment of Climate Change for the Baltic Sea Basin, London: Springer 2015 : 363-380
Viitasalo, Markku; Blenckner, Thorsten; Gårdmark, Anna; et al.
2015
Ambio, Springer 2015, Vol. 44, (Suppl 3) : S345-S356
Andersson, Agneta; Meier, H.E. Markus; Ripszam, Matyas; et al.
2013
FEMS Microbiology Ecology, Hoboken: Wiley-Blackwell 2013, Vol. 85, (2) : 338-347
Nydahl, Anna; Panigrahi, Satya; Wikner, Johan
2013
Limnology and Oceanography: Methods, Association for the Sciences of Limnology and Oceanography 2013, Vol. 11 : 1-15
Wikner, Johan; Panigrahi, Satya; Nydahl, Anna; et al.
2013
Havsmiljöinstitutets rapport, 3
Moksnes, Per-Olav; Albertsson, Jan; Elfwing, Tina; et al.
2013
Estuarine, Coastal and Shelf Science, Academia Press 2013, Vol. 136 : 269-279
Panigrahi, Satya; Nydahl, Anna; Anton, Peter; et al.
2012
Marine Ecology Progress Series, Vol. 453 : 37-48
Grubisic, Lorena M.; Brutemark, Andreas; Weyhenmeyer, Gesa A.; et al.
2012
Global Change Biology, Vol. 18, (8) : 2509-2519
Wikner, Johan; Andersson, Agneta
2012
Havet 2012: om miljötillståndet i svenska havsområden, Stockholm / Göteborg: Havsmiljöinstitutet och Havs- och vattenmyndigheten 2012 : 46-46
Wikner, Johan; Karlsson, Chatarina; Andersson, Agneta; et al.
2011
Havet 2011: om miljötillståndet i svenska havsområden, Göteborg ; Stockholm: Havs-och vattenmyndigheten, Naturvårdsverket och Havsmiljöinstitutet 2011 : 6-12
Nilsson, Jonas; Moksnes, Per-Olav; Elfwing, Tina; et al.
2011
Havet 2011: om miljötillståndet i svenska havsområden. 2011, Stockholm: Naturvårdsverket, Havsmiljöinstitutet och Havs- och vattenmyndigheten 2011 : 30-30
Wikner, Johan; Andersson, Agneta; Karlsson, Chatarina; et al.
2010
HAVET: 2010, Stockholm: Naturvårdsverket 2010 : 34-34
Wikner, Johan
2010
JRC scientific and technical reports
Rogers, Stuart; Casini, Michele; Cury, Philippe; et al.
2010
Havet: om miljötillståndet i svenska havsområden. 2010, Stockholm: Naturvårdsverket 2010 : 30-30
Wikner, Johan; Andersson, Agneta; Albertsson, Jan; et al.
2010
Havet: om miljötillståndet i svenska havsområden. 2010, Stockholm: Naturvårdsverket och Havsmiljöinstitutet 2010 : 26-29
Larsson, Ulf; Nyberg, Svante; Andreasson, Kristin; et al.
2009
Havet 2009: Nationell marin tillståndsrapport, Stockholm: Naturvårdsverket 2009 : 39-39
Wikner, Johan
2009
Limnology, Vol. 10, (2) : 73-85
Panigrahi, Satya; Wikner, Johan; Panigrahy, R. C.; et al.
2008
Havet: Nationell marin tillståndsrapport, Stockholm: Naturvårdsverket 2008 : 52-52
Wikner, Johan
2008
Gävle: Länsstyrelsen Gävleborg 2008
Andersson, Agneta; Hansen, Wenche; Wänstrand, Ingrid; et al.
2008
Länsstyrelsens rapporter, 2008:10
Andersson, Agneta; Hansen, W; Wänstrand, I; et al.
2008
Meddelanden / Länsstyrelsen, Västerbottens län, 1
Wikner, Johan; Kronholm, Malin; Sedin, Anneli; et al.
2007
Stockholm: Naturvårdsverket 2007
Båmstedt, Ulf; Andersson, Agneta; Wikner, Johan; et al.
2007
Havet: Nationell marin tillståndsrapport, Stockholm: Naturvårdsverket 2007 : 45-46
Wikner, Johan
2006
Journal of Marine Systems, Elsevier 2006, Vol. 63, (3-4) : 155-161
Algesten, Grete; Brydsten, Lars; Jonsson, Per; et al.
2005
Limnology and Oceanography, American Society of Limnology and Oceanography 2005, Vol. 50, (3) : 945-956
Kisand, Veljo; Andersson, Nina; Wikner, Johan
2005
Luleå: Länsstyrelsen i Norrbottens län 2005
Wikner, Johan
2004
Aquatic Microbial Ecology, Vol. 37, (2) : 137-148
Langenheder, Silke; Kisand, Veljo; Lindström, Eva S; et al.
2004
Marine Ecology Progress Series, Inter-Research 2004, Vol. 268 : 13-29
Sandberg, Johannes; Andersson, Agneta; Johansson, S; et al.
2004
Bottniska viken: årsrapport från den marina miljöövervakningen. 2003, Skydd av havsområden gagnar fisken, Hörnefors: Umeå marina forskningscentrum (UMF) 2004 : 11-13
Andersson, Agneta; Wikner, Johan
2004
Global Biogeochemical Cycles, Washington, D.C: American Geophysical Union (AGU) 2004, Vol. 18 : 4021-4028
Algesten, Grete; Wikner, Johan; Sobek, Sobek; et al.
2004
Bottniska viken: årsrapport från den marina miljöövervakningen. 2003, Skydd av havsområden gagnar fisken, Hörnefors: Umeå marina forskningscentrum (UMF) 2004 : 31-35
Wikner, Johan; Andersson, Agneta; Johansson, Sif; et al.
2003
Applied and Environmental Microbiology, American Society for Microbiology 2003, Vol. 69, (6) : 3607-3616
Kisand, Veljo; Wikner, Johan
2003
Journal of Microbiological Methods, Vol. 54, (2) : 183-191
Kisand, Veljo; Wikner, Johan
2003
FEMS Microbiology Ecology, Vol. 45, (2) : 189-202
Langenheder, Silke; Kisand, Veljo; Wikner, Johan; et al.
2002
Applied and Environmental Microbiology, American Society of Microbiology 2002, Vol. 68, (1) : 379-388
Kisand, Veljo; Cuadros, Rocio; Wikner, Johan
1999
Aquatic Microbial Ecology, Oldendorf: Inter-Research 1999, Vol. 20, (3) : 245-260
Wikner, Johan; Hagström, Åke
1999
Aquatic Microbial Ecology, Oldendorf: Inter-Research 1999, Vol. 17, (3) : 289-299
Wikner, Johan; Cuadros, Rocio; Jansson, Mats
1999
Aquatic Microbial Ecology, Oldendorf: Inter-Research 1999, Vol. 19, (1) : 47-56
Bertilsson, Stefan; Stepanauskas, Ramonas; Cuadros-Hansson, Rocio; et al.
1998
Applied and Environmental Microbiology, American Society for Microbiology 1998, Vol. 64, (9) : 3246-3255
Blackburn, Nicholas; Hagström, Åke; Wikner, Johan; et al.
1996
Ambio, Stockholm: Swedish Royal Academy of Sciences 1996 : 13-21
Kuparinen, Jorma; Leonardsson, Kjell; Mattila, Johanna; et al.
1996
Marine Biology, Vol. 126, (4) : 791-801
Andersson, Agneta; Hajdu, Susanna; Haecky, Pia; et al.
1995
Limnology and Oceanography, American Society of Limnology and Oceanography 1995, Vol. 40, (2) : 299-305
Zweifel, Ulla-Li; Wikner, Johan; Hagström, Åke; et al.

Research groups

Group member