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Dr. Klaas R. Timmermans

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

 

Room: E0015, Dept: BIO

E-mail @nioz.nl : klaas@nioz.nl

Phone: (+31) (0)222-369494

 

 

Education:

 

1981 – 1986:     Masters degree Biology, University of Amsterdam, (cum laude), October 1986.

1986 – 1991:     PhD, Faculty Biology, thesis defence 3 May 1991 (University of Amsterdam).

 

As off 1991, Klaas Timmermans works as a senior scientist at the Royal NIOZ, first within the Department of Marine Chemistry and Geology as off 2008 in the Department of Biological Oceanography. His main research interests are in the effects of trace metal deficiencies on open ocean (Antarctic) diatoms, in the role of diatoms in biogeochemical cycles and effects of diatom growth on global climate change, and in the bioavailability of trace metals, most notably iron. His work combines biology, analytical chemistry and metal speciation modelling.

 

PhD thesis: Timmermans, K.R. (1991). Trace metal ecotoxicokinetics of chironomids. PhD thesis University of Amsterdam, Amsterdam, The Netherlands. 185 pp.

Chapter in book: Timmermans, K.R. (1993) Accumulation and effects of trace metals in freshwater invertebrates. In: Ecotoxicology of metals in invertebrates, P.S. Rainbow and R. Dallinger, Eds., Lewis Publishers: 133 - 148.

 

 

Publications (2000 - 2008)

In press (2008):

Timmermans, KR, Veldhuis MJW, Laan, P., Brussaard CPD. (2008). Probing natural Fe fertilization near the Kerguelen (Southern Ocean) using natural phytoplankton assemblages and diatom cultures. Deep Sea Res. II special issue.

Timmermans, K.R., H.J. van der Woerd, M. Wernand, M. Sligting, J. Uitz,  H. J.W. de Baar. (2008). In situ and remote sensed Chlorophyll fluorescence as indicator of the physiological state of phytoplankton near the Isles Kerguelen (Southern Ocean). Polar Biol., DOI: 10.1007/s00300-007-0398-4

Sarthou, G., D. Vincent, U. Christaki, I. Obernosterer, K.R. Timmermans, and C.P.D. Brussaard. (2008). The fate of biogenic iron during a phytoplankton bloom induced by natural fertilization: impact of copepod grazing. Deep Sea Res. II special KEOPS issue.

De Baar, H,  K.R. Timmermans, P. Laan, H. De Porto, S. Ober, M.Bakker, J. Blom, M. Bakker, J. Schilling, G. Sarthou, L. Gerringa, M. Smit, M. Klunder. (2008).TiTan®: a New Facility for Ultraclean Sampling of Trace Elements and Isotopes in the Oceans in the International Geotraces Program. Mar. Chem.

Gerringa, L.J.A., S. Blain, P. Laan, G. Sarthou, M.J.W.Veldhuis, E. Viollier.  K.R. Timmermans. (2008). Dissolved organic ligands of Fe in the Southern Ocean (Indian sector) near the Kerguelen Archipelago. Deep Sea Res. II special KEOPS issue.

Brussaard, C.P.D., K.R. Timmermans, J. Uitz, M.J.W. Veldhuis. (2008). Virioplankton dynamics and virally induced algal lysis versus microzooplankton grazing southeast of the Kerguelen (Southern Ocean). Deep Sea Res. II special KEOPS issue.

Rijkenberg, Micha J.A., Loes J.A. Gerringa, Klaas R. Timmermans, Astrid C. Fischer, Koos J. Kroon, Anita G.J. Buma, Bert Th. Wolterbeek, Hein J.W. de Baar. (2008). Enhancement of the reactive iron pool by marine diatoms. Mar. Chem.

2007.

Timmermans, K.R., M.J.W. Veldhuis, C.P.D. Brussaard. (2007). Cell death in 3 marine diatom species in response to different irradiances levels, silicate and iron concentrations. Aquat. Micriobiol. Ecol. 46:253-261.

Fischer, A.C., Steinebach, Timmermans, K.R., Wolterbeek, H.Th. (2007). A method for the destruction and analysis of biogenic silica in two Antarctic diatom species: Thalassiosira sp. and Chaetoceros brevis. J. Applied Phycol. 19: 71-77.

De Jong, JTM, M Boye, MD Gelado-Caballero, KR Timmermans, MJW Veldhuis, RF Nolting, CMG van den Berg, HJW de Baar. (2007). Inputs of iron, manganese and aluminium to surface waters of the Northeast Atlantic Ocean and the European continental shelf. Mar. Chem. 107:120-142.

Veldhuis, M.J.W., K.R. Timmermans (2007). Phytoplankton dynamics during the EISENEX iron fertilisation experiment in the Southern Ocean: a comparative study of field and bottle incubation measurements. Aquat. Micriobiol. Ecol.47:191-208.

Sarthou, G, Baker, A, Kramer, J, Laan, P, Laës, A, Ussher, S, Achterberg, E, de Baar, HJW, Timmermans, K.R., Blain, S. (2007). Influence of high atmospheric inputs on iron distribution in the water column of the North Atlantic Ocean. Mar. Chem. 104:186-202.

Blain, S., B. Quéguiner, L. Armand, S. Belviso, B.  Bombled, L. Bopp, A. Bowie, C. Brunet, C. Brussaard,  F. Carlotti, U. Christaki, A Corbière, I. Durand, F.  Ebersbach, J-L. Fuda, N. Garcia, L. Gerringa, B. Griffiths,  C. Guigue, C. Guillerm, S. Jacquet, C. Jeandel,  P. Laan , D. Lefèvre, C. Lomonaco, A. Malits,  J.  Mosseri, I. Obernosterer, Y-H. Park, M. Picheral, P.  Pondaven , T. Remenyi, V.  Sandroni, G. Sarthou,  N.  Savoye, L. Scouarnec, M. Souhaut, D. Thuiller, K. Timmermans,  T. Trull, J. Uitz, P. van-Beek, M. Veldhuis, D. Vincent,  E Viollier, L.Vong, T. Wagener. (2007). Effects of natural iron fertilisartion on carbon sequestration in the Southern  Ocean.  Nature 446: 1070-1074.

2006.

Fischer, A.C.,  H.Th. Wolterbeek,  J.J. Kroon,  L.J.A. Gerringa, T.G. Verburg, K.R. Timmermans, J.T. van Elteren, T. Teunissen (2006). On the use of iron radio-isotopes to study iron speciation kinetics in seawater: A column separation and off-line counting approach. Sci. Tot. Environ., 362: 242-258.

Rijkenberg, M.J.A., Gerringa, L.J.A., Velzeboer, I., Timmermans, K.R., Buma, A.J.G., de Baar, H.J.W. (2006). Iron-binding ligands in Dutch estuaries are not affected by UV induced photochemical degradation. Mar. Chem. 100: 11-23.

Boye, M., A. Aldrich, C.M.G. van den Berg, J.T.M. de Jong, H. Nirmaier, M.J.W.Veldhuis, K.R. Timmermans, H.J.W. de Baar (2006). The chemical speciation of iron in the north-east Atlantic Ocean. Deep Sea Res.  I 53: 667-683.

Gerringa, LJA, Veldhuis MJW, Timmermans KR, Sarthou, G., deBaar HJW. (2006). Co-variance of dissolved Fe-binding ligands with phytoplankton characteristics in the Canary Basin. Mar. Chem. 102: 276-290.

2005.

Timmermans, K.R. , B. van der Wagt, M.J.W. Veldhuis, A. Maatman, H.J.W. de Baar (2005). Physiological responses of three species of picophytoplankton to nitrogen, phosphorus, iron and light limitation. J. Sea Res. 53: 109-120.

Veldhuis, M.J.W., K.R. Timmermans, P. Croot, B. van der Wagt (2005). Picophyto-plankton: a comparative study of their biochemical composition and photosynthetic properties. J. Sea Res. 53: 7-24.

Rijkenberg, M.J.A., Fischer, A.C., Kroon, J.J., Gerringa, L.J.A., Timmermans, K.R., Wolterbeek, H.Th., de Baar, H.J.W. (2005). The influence of UV irradiation on the photoreduction of iron in the Southern Ocean, Mar. Chem.93: 119-129.

Sarthou, G., Timmermans, K.R., Blain, S., Tréguer, P. (2005). Growth physiology and the fate of diatoms in the Ocean: a review. J. Sea Res. 53: 25-42.

Boye, M., J. Nishioka, P.L. Croot, P. Laan, K.R. Timmermans, H.J.W. de Baar (2005). Major deviations of iron complexation during 22 days of a mescoscale iron enrichment in the open Southern Ocean. Mar.Chem. 96 (3-4): 257-271.

Nishioka, J., S. Takeda, H. J. W. de Baar, P. Laan, P. Croot, M. Boye, P. Laan, K. R. Timmermans  (2005). Changes in the concentration of iron in different size fractions during an iron enrichment experiment in the open Southern Ocean, EisenEx. Mar. Chem. 95/1-2: 51-63.

Baar, H.J.W. de, P.W. Boyd, K.H. Coale, M.R. Landry, A. Tsuda, P. Assmy, D.C.E. Bakker, Y. Bozec, R.T. Barber, M.A. Brzezinski, K.O. Buesseler, M. Boye, P.L. Croot, F. Gervais, M.Y. Gorbunov, P.J. Harrison, W.T. Hiscock, P. Laan, C. Lancelot, C.S. Law, M. Levasseur, A. Marchetti, F.J. Millero, J. Nishioka, Y. Nojiri, T. van Oijen, U. Riebesell, M.J.A. Rijkenberg, H. Saito, S. Takeda, K.R. Timmermans, M.J.W. Veldhuis, A.M. Waite, C-S. Wong  (2005). Synthesis of 8 Iron Fertilizations experiments: from the Iron Age in the Age of Enlightenment  JGR Special 110 (C9): Art. No. C09S16

2004.

Timmermans, K.R., B. van der Wagt, H. J.W. de Baar (2004). Growth rates, half saturation constants, and silicate, nitrate, and phosphate depletion in relation to iron availability of  four large open ocean diatoms from the Southern Ocean.  Limnol. Oceanogr. 49 (6): 2141-2151.

Gerringa, L.J.A., Rijkenberg, M.J.A., Timmermans, K.R., Buma, A.G.J. (2004). The influence of solar ultraviolet radiation on the photochemical production of H2O2 in the equatorial Atlantic Ocean. J. Sea Res. 51: 3 – 10.

Croot, P.L., P. Laan, J. Nishioka, V. Strass, M. Boye, K.R. Timmermans, R.G. Bellerby, L. Goldson. P. Nightingale, H.J.W. de Baar (2004). Spatial and temporal distribution of Fe(II) and H2O2 during EisenEx, an open ocean mesoscale iron enrichment. Mar. Chem. 95/1-2 pp. 65-88

Kramer, J.,  P. Laan, G. Sarthou, K.R. Timmermans, H.J.W. de Baar (2004). Distribution of dissolved aluminium in the high atmospheric input region of  the subtropical waters of the North Atlantic Ocean. Mar. Chem. 88: 85 – 101.

Schulz, K.G., I. Zondervan, L.J.A. Gerringa, K.R. Timmermans, M.J.W. Veldhuis, U. Riebesell (2004). Effect of trace metal availability on coccolithophorid calcification. Nature: 430: 673-676.

Rijkenberg, M.J.A. , Gerringa, L.J.A., Neale, P.J.,  Timmermans, K.R., Buma, A.G.J., de Baar, H.J.W. (2004). UVA variability overrules UVB ozone hole effects on the photoreduction of iron in the Southern Ocean. Geophys. Res. Letters. 31:doi:10.1029/2004GL020829.

2003.

Buitenhuis, E.T., K.R. Timmermans, H.J.W de Baar (2003). Zinc-bicarbonate co-limitation of Emiliania huxleyi (Prymnesiophyceae). Limnol. Oceanogr. 48: 1575 - 1582.

Visser, F.,  L.J.A. Gerringa, S.J. van der Gaast, H.J.W de Baar, K.R. Timmermans (2003). The role of reactivity and iron content of aerosol dust on growth rates of two Antarctic diatom species. J. Phycol. 39: 1085-1094.

2001.

Timmermans, K.R., L.J.A. Gerringa, H.J.W. de Baar, B. van der Wagt, M.J.W. Veldhuis, J.T.M. de Jong, P.L. Croot, M. Boye (2001). Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater. Limnol. Oceanogr. 46: 260 – 266.

Timmermans, K.R., J. Snoek, L.J.A. Gerringa, H. J.W. de Baar (2001). Not all eukaryotic algea can interreplace cobalt and zinc: Chaetoceros calcitrans (Bacillariophyceaea) versus Emiliania huxleyi (Prymnesiophyceae). Limnol. Oceanogr. 46 (3): 699 – 704.

Timmermans, K.R.,  M.S. Davey, B. van der Wagt, J. Snoek, R.J. Geider, M.J.W. Veldhuis, L.J.A. Gerringa, H.J.W. de Baar (2001). Co-limitation by iron and light of Chaetoceros brevis, C. dichaeta and C. calcitrans (Bacillariophyceae). Mar. Ecol. Prog. Ser. 217: 287 - 297.

Veldhuis, M.J.W., G.W. Kraay, K.R. Timmermans (2001). Cell death in phytoplankton: correlation between changes in membrane permeability, photosynthetic activity, pigmentation and growth.  Eur. J. Phycol. 36: 167 - 177.

2000.

Gerringa, L.J.A., H.J.W. de Baar, K.R.Timmermans (2000). Iron limitation of phytoplankton growth in natural waters versus artificial laboratory media with EDTA. Mar. Chem. 335 – 347.

Hunnik, E. van, H. van den Ende, K.R. Timmermans, P. Laan, J.W. de Leeuw (2000). A comparison of CO2 uptake by the green algae Tetraedron minimum and Chlamydomonas monoica. Plant Biol 2 : 624 – 627.

Nolting, R.F., Heijne, M., Jong, J.T.M. de, Timmermans, K.R., Baar, H.J.W. de (2000). The determination and distribution of Zn in surface water samples collected in the northeast Atlantic Ocean. J. Environ. Monit.: 534 – 538.