Dr Fleur C. van Duyl Senior Scientist	ROYAL NETHERLANDS INSTITUTE FOR SEA RESEARCH   Postal address: P.O. Box 59, NL-1790 AB Den Burg (Texel) The Netherlands   Visiting address: Landsdiep 4 NL-1797 SZ ’t Horntje (Texel) The Netherlands   Phone: (+31) (0)222-369300 Fax: (+31) (0)222-319674
E-mail: duyl@nioz.nl   Phone: (+31) (0)222-369543
Research Interests
Benthic microbial ecology with special focus on:                                                ·         Microbial ecology of cold and warm water coral reefs. ·         Pelagic-benthic coupling: Role of (micro)benthos in organic matter cycling (pico-nanoplankton, dissolved organic matter, colloids) and in inorganic nutrient cycling.  ·         Origin of organic food sources for reef sponges. Dissolved organic matter feeding by sponges. Trophic relations in sponge-microbe consortia. ·        Diversity and function, chemoautotrophy and nitrification by sponge/coral associated microbes.
Current Projects
·         Biodiversity and ecosystem functioning of deep water coral reefs in the NE Atlantic. ·         Dissolved organic matter cycling on coral reefs: Are coral cavities sinks of DOM? ·         The role of native and/or invasive ecosystem engineers in explaining biodiversity. ·         Health status of coral reefs along an eutrophication gradient in the Berau region, East Kalimantan, Indonesia ·         Sustainable production, Physiology, Oceanography, Natural Products, Genetics and Economics of Sponges.
Student oportunities
·         sponge feeding experiments with different DOM size fractions and composition (quality) ·         chemoautotrophy by sponge associated microbes and molecular identification of chemoautotrophs.
Peer reviewed publication list  (1997-2007)
Van Duyl, F.C. , J. Hegeman, A. Hoogstraten, C. Maier (2007). Dissolved (in)organic carbon fixation by sponge-microbe consortia of deep water coral mounds in the NE Atlantic. Submitted to Mar Ecol Prog Ser De Goeij, J.M., H. van den Berg, M. M. van Oostveen, E.H.G. Epping, F.C. van Duyl (2007). Major bulk DOM removal by encrusting coral reef cavity sponges. Submitted to Mar Ecol Prog Ser De Goeij, J.M., F.C. van Duyl (2007). Coral cavities are sinks of dissolved organic matter. Limnol. Oceanogr. Accepted. Van Soest R.W.M., F.C. Van Duyl, Maier C., M.M.S.Lavaleye,  E. Beglinger, K.R. Tabachnick (2007). Mass occurrence of the hexactinellid Rossella nodastrella Topsent in bathyal coral reefs of Rockall Bank, W of Ireland. Proc 7th Int Sponge Conference, Buzios, Brasil. In press Van Soest, R. W. M., D. F. R. Cleary, M.J.De Kluijver, M.M.S.Lavaleye, C.Maier, F.C. van Duyl (2007). Sponge diversity and community composition in Irish bathyal coral reefs. Contributions Zool 76 (2): 121-142. Van Duyl, F.C., S.R. Scheffers, F.I.M. Thomas, M. Driscoll (2006). The effect of water exchange on bacterioplankton depletion and inorganic nutrient fluxes in coral cavities. Coral Reefs 25:23-36. Scheffers, S.R., R.P.M. Bak & F.C. van Duyl (2005). Why is bacterioplankton growth in coral reef framework cavities enhanced? Mar. Ecol. Prog. Ser. 299:89-99. Scheffers, S.R., G. Nieuwland, R.P.M. Bak & F.C. Van Duyl (2004). Removal of bacteria and nutrient dynamics within the coral framework of Curaçao (Netherlands Antilles). Coral Reefs 23: 413-422. Scheffers, S.R., J.M. de Goeij, F.C. Van Duyl & R.P.M. Bak (2003). The cave-profiler: A simple tool to describe the 3D-structure of inaccessible coral reef cavities. Coral Reefs 22: 49-53. Van Duyl, F.C., G-J. Gast, W. Steinhoff, S. Kloff, M.J.W. Veldhuis, R.P.M. Bak (2002) Factors influencing the short-term variation in phytoplankton composition and biomass in coral reef waters. Coral Reefs 21: 293-306. Visser, P.M., J.J. Poos, B.B. Scheper, P. Boelen, F.C. van Duyl (2002). Diurnal variations in depth profiles of UV-induced DNA damage and inhibition of bacterioplankton production in tropical coastal waters. Mar. Ecol. Prog. Ser. 228:25-33. Van Duyl, F.C., G.J. Gast (2001). Linkage of small-scale spatial variations in DOC, inorganic nutrients and bacterioplankton growth with different coral reef water types. Aquat. Microb. Ecol. 24: 17-24.   Van Duyl, F.C., B. de Winder, A.J. Kop, U. Wollenzien (2000). Consequences of diatom mat erosion for carbohydrate concentrations and heterotrophic bacterial activity in intertidal sediments of the Ems-Dollard estuary. Cont. Shelf Res. 20: 1335-1349. Van Duyl, F.C., B. de Winder, A.J. Kop, U. Wollenzien (1999). Tidal coupling between carbohydrate concentrations and bacterial activities in diatom-inhabited intertidal mudflats. Mar. Ecol. Prog. Ser. 191: 19-32. Gast, G. J., P. J. Jonkers, F.C. van Duyl, , R.P.M. Bak (1999). Bacteria, flagellates and nutrients in island fringing coral reef waters: influence of the ocean, the reef and eutrophication. Bull. Mar. Sci. 65: 523-538. Hondeveld, B.J.M., R.P.M. Bak, W. van Raaphorst, F.C. van Duyl (1999). Impact of grazing by benthic eukaryotic organisms on the nitrogen sediment-water exchange in the North Sea. J. Sea Res. 41: 255-268. Visser, P. M., E. Snelder, A.J.Kop, P.Boelen, A.G.J.Buma, F.C. van Duyl (1999). Effects of UV radiation on DNA photodamage and production in bacterioplankton in the coastal Caribbean Sea. Aquat. Microb. Ecol. 20: 49-58. Gast, G. J., S. Wiegman, E.Wieringa, F.C. van Duyl, R.P.M. Bak (1998). Bacteria in coral reef water types: removal of cells, stimulation of growth and mineralization. Mar. Ecol. Prog. Ser. 167: 37-45. Van Duyl, F.C., W.W.C. Gieskes,  A.J. Kop, W.E. Lewis (1998). Biological control of short-term variations in the concentration of DMSP and DMS during a Phaeocystis spring bloom. J. Sea Res. 40(3-4): 221-231. Van Duyl, F.C., G.C.A. Duineveld, A.J. Kop (1997). Short-term variability in pelagic-benthic exchange of phytopigments and their relations to benthic bacterial variables in the North Sea. Aquat. Microb. Ecol. 13: 47-61. Osinga, R., K.A. Vries, W.E. Lewis, W. van Raaphorst, L. Dijkhuizen, F.C. van Duyl (1997). Aerobic degradation of phytoplankton debris dominated by Phaeocystis sp. in different physiological stages of growth. Aquat. Microb. Ecol. 12: 11-19. Osinga, R., A.J. Kop, J.F.P. Malschaert, F.C. van Duyl (1997). Effects of the sea urchin Echinocardium cordatum on bacterial production and carbon flow in experimental benthic systems under increasing organic loading. J. Sea Res. 37(1-2): 109-121.   (click for complete list)