Ingvar Sundh,^* Mats Nilsson,^** Catharina Mikkelä,^*** Gunnar Granberg,^**** Bo H. Svensson<sup>*****


*</sup>Ingvar Sundh has a PhD in limnology from Uppsala University, Sweden. Currently, he holds a research position and is associate professor at the Department of Microbiology at the Swedish University of Agricultural Sciences. He is also studying the microbial ecology of the biogas process and compost. His address: Department of Microbiology, SLU, P.O. Box 7025, SE-750 07 Uppsala, Sweden. ingvar.sundh@mikrob.slu.se
^**Mats Nilsson has a PhD in forest ecology from the Swedish University of Agricultural Sciences. He holds a senior researcher position and is associate professor at the Department of Forest Ecology, SLU. He is leading a research team focusing on microbial ecology and biogeo-chemical processes in boreal mires. His address: Department of Forest Ecology, SLU, SE-901 83 Umeå, Sweden. mats.b.nilsson@sek.slu.se
^***Catharina Mikkelä has a PhD in forest ecology. She has studied the dynamics and net emission of methane from peatlands. Her address: Office of Environment and Construction, P.O. Box 302, SE-293 24 Olofström, Sweden. catharina.mikkela@olofstrom.se
^****Gunnar Granberg has a PhD in soil science. He is studying the biogeochemistry of peatlands, with special emphasis on modelling approaches and on effects of increased, anthropogenic deposition of nitrogen and sulfur. He currently holds a post-doc. position at MIT in Massachusetts, USA. His address: R. M. Parsons Lab, MIT Bldg. 48-108, Cambridge, MA 02139, USA. ggr@mit.edu
^*****Bo Svensson has a PhD in microbiology and is professor at the Department of Water and Environmental Studies at Linköping University. His research areas include physiology of anaerobic microorganisms, biogeochemistry of wetlands, and degradation of organic pollutants in landfills and biological waste-treatment systems. His address: Department of Water and Environmental Studies, Linköping University, SE-581 83 Linköping, Sweden. bosseh@tema.liu.se