Morten Søndergaaard

Full Professor

Freshwater Biological Laboratory,

University of Copenhagen

On these pages, you can find more detailed information on my activities, my projects and my publications. I don't intend to make this a fancy site, rather a source of relevant information. Therefore, I'll make it very short to begin with.

Projects

Production and decomposition of dissolved organic carbon (DOC) in lakes and coastal waters

Dissolved organic matter (DOM) in coastal ecosystems: transport, dynamics and environmental impact

DOC decomposition and bacterial succession

Active bacteria in freshwater plankton

Consequences of weather and climate changes for marine and freshwater ecosystems, conceptual and operational forecasting of the aquatic environment

Full Publication List

Books and book chapters:

 Søndergaard, M. & Riemann, B., 1979. Ferskvandsbiologiske analysemetoder (Freshwater-biological methods). Akademisk Forlag, Copenhagen, 227 p.

Riemann, B. & Søndergaard, M. (eds), 1986. Carbon dynamics in eutrophic, temperate lakes. Elsevier Sci. Publ., Amsterdam. 294 p. Editor and contributing to the chapters: 1, 3, 4, 7 and 8.                         

Sand-Jensen, K. & Søndergaard, M., 1986. Guest Editors for Aquatic Botany 26, nos. 3/4 p. 201-392. Special Issue: Submerged macrophytes: Carbon metabolism, growth regulation and role in macrophyte-dominated ecosystems.

Søndergaard, M., 1988. Photosynthesis of aquatic plants under natural conditions. In: Vegetation of inland waters, Symoens, J.J. (ed.) vol. 15 of "Handbook of Vegetation Science". Dr. W. Junk, The Hague , Netherlands , p. 63-111.

Jeppesen, E. , Søndergaard, Ma., Søndergaard, M. & Christoffersen, K. (eds). 1998. The structuring role of submerged macrophytes in Lakes. Springer Verlag, New York , 423pp.

Srndergaard, M. 2002. A biography of E. Steemann Nielsen; The Man and his Science. In: Phytoplankton productivity. Carbon assimilation in marine and freshwater ecosystems. Williams, P. J leB. , Reynolds, C. & Thomas, D. (eds.). Blackwell Science. p. 1-15.

Søndergaard, M. & Thomas, D. N. (eds.). 2004. Dissolved Organic Matter (DOM) in Aquatic Ecosystems. A Study of European Catchments and Coastal Waters. 72 pp. ISBN 87-89143-25-6. Contributing to Chapters 1, 3, 6 and 7.

M.Sc. Srndergaard, M., 1977. PrimFr produktion i en Lobelia sr med sFrlig henblik pD isoetidernes rkologi og produktionsmFssige betydning (Primary production in a Lobelia lake with special emphasis on the ecology and productivity of the isoetides). 174 p. Botanical Institute, University of Aarhus .

Lic. Scient (Ph.D). Srndergaard, M., 1980. Carbon metabolism in submerged freshwater macrophytes - aspects of the physiological ecology. (Compiled of 5 published articles). Botanical Institute, University of Aarhus .

Refereed Articles:

Srndergaard, M. & S. LFgaard. 1977. Vesicular-arbuscular mycorrhiza in some aquatic vascular plants. Nature: 268. 232-233.

Srndergaard, M. & K. Sand-Jensen. 1978. Total autotrophicproduction in oligotrophic Lake Kalgaard , Denmark.Verh. Int. Ver. Limnol. 20: 667-673.

Sand-Jensen, K. & M. Srndergaard. 1978. Growth and production of isoetids in oligotrophic Lake Kalgaard , Denmark . Verh. Int. Ver. Limnol. 20: 659-666.

Srndergaard, M. & K. Sand-Jensen. 1979. Physico-chemical environment, phytoplankton biomass and production in oligotrophic softwater Lake Kalgaard , Denmark . Hydrobiologia 63: 241-253.

Sand-Jensen, K. & M. Srndergaard. 1979. Distribution and quantitative development of aquatic macrophytes in relation to sediment characteristics in oligotrophic Lake Kalgaard , Denmark . Freshwat. Biol. 9: 1-11.

Srndergaard, M. & K. Sand-Jensen. 1979. Carbon uptake by leaves and roots of Littorella uniflora (L.) Aschers. Aquat. bot. 6: 1-12.

Srndergaard, M. & K. Sand-Jensen. 1979. The delay in ¹⁴C-fixation rates by three submerged macrophytes -asource of error in the ¹⁴C-technique. Aquat.Bot.6:111-119.

Srndergaard, M. 1979. Light and dark respiration and the effect of the lacunae system on refixation of CO₂ in submerged aquatic plants. Aquat. Bot. 6: 269-283.

Srndergaard, M. & R.G. Wetzel. 1980. Photorespiration and internal recycling of CO₂ in the submerged angiosperm Scirpus subterminalis. Can. J. Bot. 58: 591-598.

Srndergaard, M. 1980. Adsorption of inorganic carbon-14 to polyethylene scintillation vials - a possible source of error in measures of extracellular release of organic carbon. Arch. Hydrobiol. 90: 362-366.

Srndergaard, M. 1981. Loss of inorganic and organic carbon by ¹⁴C-labelled aquatic plants. Aquat. Bot. 10: 33 -43.

Srndergaard, M. 1981. Kinetics of extracellular release of ¹⁴C-labelled organic carbon by submerged macrophytes. Oikos 36: 331-347.

Sand-Jensen, K. & M. Srndergaard. 1981. Phytoplankton and epiphyte development and their shading effect on submerged macrophytes in lakes of different nutrient status. Int. Rev. ges. Hydrobiol. 66(4): 529-552.

Srndergaard, M. & H.-H. Schierup. 1982. Dissolved organic Carbon during a spring diatom bloom in Lake Mossr , Denmark . Water Res. 16: 815-821.

Srndergaard, M. & H.-H. Schierup. 1982. Release of extracellular organic carbon during a diatom bloom in Lake Mossr : Molecular weight fractionation. Freshwater Biol. 12: 312-320.

Riemann, B., M. Srndergaard, H.-H. Schierup, S. Bosselmann, G. Christiansen, T. Hansen & B. Nielsen. 1982. Carbon metabolism during a spring diatom bloom in the eutrophic Lake Mossr . Int. Rev. ges. Hydrobiol. 67: 145-185.

Jensen, L.M. & M. Srndergaard. 1982. Abiotic formation of particles from extracellular organic carbon released by phytoplankton. Microb. Ecol. 8: 47-54.

Madsen, T.V. & M. Srndergaard. 1983. The effect of current velocity on the photosynthesis of Callitriche stagnalis Scop. Aquatic Bot. 15: 187-193.

Srndergaard, M. 1983. Heterotrophic utilization and decomposition of extracellular organic carbon (EOC)released by the aquatic angiosperm Littorella uniflora. Aquatic Bot. 16: 59-73.

Jrrgensen, N.O.G., M. Srndergaard, H.J. Hansen, S. Bosselmann & B. Riemann. 1983. Diel variations in concentration, assimilation and respiration of dissolved free amino acids in relation to planktonic primary and secondary production in two eutrophic lakes. Hydrobiol. 107: 107-122.

Riemann, B. & M. Srndergaard. 1984. Measurements of diel rates of bacterial secondary production in aquatic environments. Appl. Environ. Microbiol.: 632-638.

Srndergaard, M., 1984. Dissolved organic carbon in Danish lakes: Concentration, composition and lability. Verh. Int. Ver. Theo. Angew. Limnol. 22: 780-784.

Riemann, B. & M. Srndergaard. 1984. Bacterial growth in relation to phytoplankton primary production and extracellular release of organic carbon. In: Hobbie, J.E. & P.J. LeB. Williams (eds.): Heterotrophic activity in the Sea. Plenum Press. p. 233-248.

Srndergaard, M., L. Emmery & K.S. Hansen. 1984. Phytoplankton development and release of extracellular organic carbon (EOC): Enclosure experiments. Nordic Symposium on "Trophic interactions in freshwater". Nordic Limnology Symposium. p. 35-44.

Jrrgensen, N.O.G. & M. Srndergaard. 1984. Are dissolved free amino acids free? Microb. Ecol. 10: 301-316.

Jensen, L.M., N.O.G. Jrrgensen & M. Srndergaard. 1985. Specific activity: Significance for estimating release rates of extracellular dissolved organic carbon (EOC) by algae. Verh. Int. Theo. Limnol. 22: 2893-2897.

Jensen, L.M. & M. Srndergaard. 1985. Comparison of two methods to measure algal release of dissolved organic carbon and the subsequent uptake by bacteria. J.Plank.Res. 7: 41-56.

Srndergaard, M., 1985. On the radiocarbon method: filtration or the acidification and bubbling method. J. Plank. Res. 7: 391-397.

Srndergaard, M., B. Riemann & N.O.G. Jrrgensen. 1985. Extracellular organic carbon (EOC) released by phytoplankton and bacterial production. Oikos 45: 323-332.

Friis, N.J.S., R. Christiansen & M. Srndergaard. 1985. Growth response and nitrogen and phosphorus tissue content of Littorella uniflora (L) Aschers. in relation to nitrogen and phosphorus enrichment of the sediment in oligotrophic Lake Hampen , Denmark . Aquat. Bot. 23: 1-11.

Hansen, L., G.F. Krog & M. Srndergaard. 1986. Decomposition of lake phytoplankton. I. Dynamic of short-time decomposition. Oikos 46: 37-44.

Krog, G.F., L. Hansen & M. Srndergaard. 1986. Decomposition of lake phytoplankton. II. The composition and lability of lysis products. Oikos 46: 45-50.

Riemann, B. & M. Srndergaard. 1986. Regulation of bacterial secondary production in two eutrophic lakes and in experimental enclosures. J. Plankton Res. 8: 519-536.

Srndergaard, M. 1988. Simultaneous measurements of carbon-14 and carbon-12 exchange in submerged macrophytes. Verh. Int. Ver. theor. Angew. Limnol. 23: 921-927.

Srndergaard, M. et al. 1988. Pelagic food web processes in an oligotrophic lake. Hydrobiologia. 164: 271-286.

SchwFrter, S., M. Srndergaard, B. Riemann & L. Mrller Jensen. 1988. Respiration in eutrophic lakes: The contribution of bacterioplankton and bacterial growth yield. J. Plankton Res. 10: 515-531.

Srndergaard, M. 1988. Comparison of ¹⁴CO₂ and ¹²CO₂ exchange in some marine macroalgae. Botanica Marina 31: 417-422.

Srndergaard, M. & G. Bonde. 1988. Photosynthetic response and pigment content of Littorella uniflora in a depth  gradient. Aquat. Bot. 32: 307-319.

Booth, W. & M. Srndergaard. 1989. Picophytoplankton in the Hauraki Gulf, New Zealand . New Zealand J. Mar. Freshwater Res. 23: 69-78.

Srndergaard M. 1990. The effect of environmental variables on release of extracellular organic carbon by freshwater macrophytes. Folia geobot. taxon. 25: 321-332.

Srndergaard, M. 1990. Picophytoplankton in Danish lakes. Verh. Int. Ver. Theor. Angew. Limnol. 24: 609-612.

Srndergaard, M. 1990. Extracellular organic carbon (EOC) in the genera Carpophyllum (Phaeophyceae): Diel release patterns and EOC lability. Mar.Biol.104: 143-151.

Riemann, B. et al. 1990. Carbon budgets of the microbial food web in estuarine enclosures. Mar. Ecol.Prog. Ser. 65: 159-170.

Srndergaard, M. 1991.Phototrophic picoplankton in temperate lakes: Seasonal abundance and importance along a trophic gradient. Int. Revue Gesamt. Hydrobiol. 76: 505-522.

Srndergaard, M., Jensen, L.M. & Ertebjerg, G. 1991. Picoalgae in Danish coastal waters during summer stratification. Mar. Ecol. Prog. Ser. 79: 139-149.

Jespersen, A.-M., Nielsen, J., Riemann, B. & Srndergaard, M. 1992. Carbon-specific phytoplankton growth rates: A comparison of methods. J. Plankton Res. 14: 637-648.

Srndergaard, M. & Borch , N.H. 1991. Decomposition of dissolved organic carbon (DOC) in lakes. Arch. Hydrobiol. Ergeb. 37: 9-19.

Middelboe, M., Nielsen, B. & Srndergaard,M. 1991. Bacterial utilization of dissolved organic carbon (DOC) in coastal waters -determination of growth yield. Arch. Hydrobiol. Ergeb. 37: 51-61.

Letarte, Y., Hansen, H.J., Srndergaard, M. & Pinel-Alloul,B. 1991. Production and abundance of different bacteria size-classes: relationship with primary production and chlorophyll concentrations. Arch. Hydrobiol. 126: 15-26.

Srndergaard, M. 1993. Organic carbon pools in two Danish lakes. Flow of carbon to bacterioplankton. Verh. Int. Ver. Angew. Theor. Limnol. 25: 593-598.

Christoffersen, K., Riemann, B., Klysner, A. & Srndergaard, M. 1993. Potential role of fish predation and natural populations of zooplankton in structuring a plankton community in eutrophic water. Limnol. Oceanogr. 38: 561-573.

Srndergaard, M. & Middelboe, M. 1993. Measurements of particulate organic carbon: a note on the use of glass fiber (GF/F) and Anodisc filters. Arch. Hydrobiol. 127: 73-85.

Middelboe, M. & Srndergaard, M. 1993. Bacterioplankton growth yield: Seasonal variations and coupling to substrate lability and ß-glucosidase activity. Appl. Environ. Microbiol. 59: 3916-3921.

Markager, S., Hansen, B. & Srndergaard, M. 1994. Pelagic carbon metabolism in a eutrophic lake during a clear-water-phase. J. Plankton Res. 16: 1247-1267.

Srndergaard, M., Hansen, B & Markager, S. 1995. Dynamics of dissolved organic carbon lability during a clear water phase in a eutrophic lake. Limnol. Oceanogr. 40: 46-54.

Middelboe, M., Srndergaard, M., Letarte, Y. & Borch, N.H. 1995. Attached and free-living bacteria: Production and polymer hydrolysis during a diatom bloom. Microb. Ecol. 29: 231-248.

Middelboe, M. & Srndergaard, M. 1995. Concentration and bacterial utilization of sub-micron particles and dissolved organic carbon in lakes and a coastal area. Arch. Hydrobiol. 133: 129-147.

Srndergaard, M. & Middelboe,M. 1995. A cross-system analysis of labile dissolved organic carbon (DOC_L). Mar. Ecol. Prog. Ser. 118: 283-294.

Williams, P. J. Le B., Robinson, C, Srndergaard, M. et al. 1996. Algal ¹⁴C and total carbon metabolism. 2. Experimental observations with the diatom Skeletonema costatum. J. Plankton Res. 18: 1961-1974.

Hygum, B. Petersen, J. & Srndergaard, M. 1997. Zooplankton as producers of bacterial substrate. J. Plankton Res. 19: 97-111.

Srndergaard, M. & Theil-Nielsen, J. 1997. Bacterial growth efficiency in lakewater cultures. Aquat. Microb. Ecol. 12: 115-122.

Srndergaard, M. 1997. Bacteria and dissolved organic carbon in lakes. In: Sand-Jensen, K. & Pedersen, O.(eds.), Priorities and highlights in Danish freshwater research. Gads Forlag. Page: 138-161.

Sand-Jensen, K. & Srndergaard, M. 1997. Plants and environment in Danish Lobelia-lakes. In: Sand-Jensen, K. & Pedersen, O.(eds.), Priorities and highlights in Danish freshwater research. Gads Forlag. Page 54-73.

Schlüter, L., Riemann, B. & Srndergaard, M. 1997. Nutrient limitation in relation to phytoplankton carotenoid/chlorophyll a ratios in freshwater mesocosms. J. Plankton Res. 19: 891-906.

Srndergaard, M. et al. 1998. Bacterioplankton and carbon turnover in a dense macrophyte canopy. In: Jeppesen, E. Srndergaard, M. & Christoffersen, K. (eds.), The structuring role of submerged macrophytes in lakes. pp. 250-261.  Springer Verlag, New York .

Wetzel, R.G. & Srndergaard, M. 1998. The role of submersed macrophytes for the microbial community and dynamics of dissolved organic carbon in aquatic ecosystems. In: Jeppesen, E. Srndergaard, M. & Christoffersen, K. (eds.), The structuring role of submerged macrophytes in lakes. pp. 133-148. Springer Verlag, New York .

Worm, J. & Srndergaard, M. 1998. Dynamics of heterotrophic bacteria attached to the cyanobacteria Microcystis. Aquat. Microb. Ecol. 14: 19-28.

Worm, J. & Srndergaard, M. 1998. Alcian blue-stained particles in a eutrophic lake. J. Plankton Res. 20: 179-186.

Theil Nielsen, J. & Srndergaard, M. 1998. Bacterial carbon biomass calculated from biovolumes. Arch. Hydrobiol. 141: 195-207.

Vähätalo, A., Srndergaard, M., Schlüter, L. & Markager, S. 1998. Impact of solar radiation on the decomposition of detrital leaves of eelgrass Zostera marina. Mar. Ecol. Prog. Ser. 170: 107-117.

Theil-Nielsen, J. & Srndergaard, M. 1999. Production of epiphytic bacteria and bacterioplankton in three shallow lakes. Oikos 86: 283-292.

Törnblom, E. & Srndergaard, M. 1999. Seasonal dynamics of bacterial biomass and production on eelgrass Zostera marina leaves. Mar. Ecol. Prog. Ser. 179: 231-240.

Srndergaard, M., Williams, P.J. leB. et al. 2000. Net accumulation and the flux of DOC and DON in marine plankton communities. Limnol. Oceanogr. 45: 1097-1111.

Srndergaard, M. & Borch, N. H., Riemann B. 2000. Dynamics of semi-labile DOC produced by freshwater plankton communities. Aquat. Microb. Ecol. 23: 73-83.

Worm, J., Jensen, L. E., Hansen, T. S., Srndergaard, M. & Nybroe, O. 2000. Interactions between proteolytic and non-proteolytic Pseudomonas fluorescens affect extracellular protein degradation in a model community. FEMS Microb. Ecol. 32: 103-109.

Srndergaard, M. 2000. Bacterioplankton: How many and how active? Verh. Int. Ver. Theor. Angew. Limnol. 27: 859-865.

Srndergaard, M. & Worm, J. 2001. Measurement of biodegradable dissolved organic carbon in lake water with a bioreactor. Water Res. 35: 2505-2513.

Srndergaard, M. & Danielsen, M. 2001. Active bacteria (CTC+) in temperate lakes: Temporal and cross-system variations. J. Plankton Res. 23: 1195-1206.

Worm, J., Gustavson, K. Garde, K, Borch , N.H. & Srndergaard, M. 2001. Functional similarity of attached and free-living bacteria during freshwater phytoplankton blooms. Aquat. Microb. Ecol. 25: 103-111.

Jeppesen, E., Srndergaard, M. et al. 2002. Cascading trophic interactions in the littoral zone: an enclosure experiment in shallow Lake Stigsholm , Denmark . Arch. Hydrobiol. 153: 533-555.

Vähätalo, A. V. & Srndergaard, M. 2002. Carbon transfer from detrital leaves of eelgrass (Zostera marina) to bacteria. Aquat. Bot. 73: 265-273.

Laws, E. et al. 2002. Photosynthesis and primary productivity in marine ecosystems: practical aspects and application of techniques. JGOFS Report No 36, July 2002. pp. 88. http://www.uib.no/jgofs/Publications/Report_Series/JGOFS_36.pdf.

Lucea, A., Duarte , C.M., Agusti, A, & Srndergaard, M. 2003. Nutrient (N, P and Si) and carbon partitioning in the stratified NW Mediterranean. Journal of Sea Res. 324: 1-14.

Duarte , C. M., Lucea, A. & Srndergaard, M. 2004. The effect of nutrients on the partitioning of nutrients in experimental coastal Mediterranean system. Biogeochemistry. 68: 153-167.

Søndergaard, M., Stedmon, C. & Borch, N. H. (2003) Fate of terrestrial dissolved organic carbon in estuaries: aggregation and bioavailability. Ohelia 57: 161-176.

Kragh, T. & Srndergaard, M. 2004 The bioavailability of autochthonous DOC: Effects of mesozooplankton. Aquat. Microb. Ecol. 36: 61-72.

Riemann, L. & Srndergaard, M. 2004. Profiles of bacterial community composition and metabolic potential through a plug-flow bioreactor fed with lake water. J. Plankton Res. 26:973-978.

Liboriussen, L., Landkildehus, F. Meerhoff, M., Bramm , M.E. , Søndergaard, M. et al. 2005.Global warming: Design of a flow-through shallow lake mesocosm climate experiment. Limnol. Oceanogr. Methods 3: 1-9.

In press

Søndergaard, M. Dissolved organic carbon (DOC) and its bioavailability in Lake Esrum , Denmark . Verh. Int. Ver. Angew. Theor. Limnol. 29