in scientific journals

(* corresponding author)


78. Kügler, S., Cooper, R.E., Boessneck, J., Wichard, T.* (2020) Rhizobactin B is the preferred siderophore by a novel Pseudomonas isolate to obtain iron from dissolved organic matter in peatland. Biometals. in press DOI: 10.1007/s10534-020-00258-w

77. Wichard, T., Ghaderiardakani, F., Zimmermann, J., Karsten, K., Grossart, H.-P., Livenets, A. (2020) 'Biodiversity and adaptation of polar algae and their interactions with symbionts and parasites in a changing environment', in T. Fromm, C. Oberdieck, T. Matz, C. Wesche (eds) Reports on polar and marine research 745, Alfred Wegener Institute for Polar and Marine Research: Bremerhaven, pp. 93-103. doi: 10.2312/BzPM_0745_2020

76. Cooper, R.E., Wegner, C., Kügler, S., Remington, X., Ueberschaar, N., Wurlitzer, J.D., Stettin, D., Wichard, T., Pohnert, G., Küsel, K.* (2020) Iron is not everything: unexpected complex metabolic responses between iron-cycling microorganisms. ISME J. in press

75. Vockenberg T.,  Wichard T., Ueberschaar N., Franke M.,  Stelter M.,  Braeutigam P.* (2020) Sorption behaviour of amine micropollutants on polyethylene microplastics-Impact of aging and interaction with green seaweed. Environmental Science: Processes & Impacts 22:1678-1687.

74. Polikovsky M.*, Califano G., Dunger N., Wichard T., Golberg A.* (2020) Engineering bacteria-seaweed symbioses for modulating the photosynthate content of Ulva (Chlorophyta): Significant for the feedstock of bioethanol production. Algal Research 49: 101945.

73.  Alsufyani T., Califano G., Deicke M., Grueneberg J., Weiss A., Engelen A.H., Kwantes M., Mohr J.F., Ulrich J.F., Wichard T* (2020) Macroalgal–bacterial interactions: identification and role of thallusin in morphogenesis of the seaweed Ulva (Chlorophyta), Journal of Experimental Botany 71: 3340-3349.

72. Califano G., Kwantes M., Abreu M.H., Costa R., Wichard T* (2020) Cultivating the Macroalgal Holobiont: Effects of Integrated Multi-Trophic Aquaculture on the Microbiome of Ulva rigida (Chlorophyta). Frontiers in Marine Science. 7:52. doi: 10.3389/fmars.2020.00052


71. Ghaderiardakani F., Califano G., Mohr J.F., Abreu M.H., Coates J.C., Wichard T* (2019) Analysis of algal growth- and morphogenesis-promoting factors in an integrated multi-trophic aquaculture system for farming the green seaweed Ulva spp. Aquaculture Environment Interactions 11: 375-391.

70. Deicke, M., Mohr, J-F., Roy, S., Herzsprung, P., Bellenger, J-P., Wichard, T.* (2019) Metallophore profiling of nitrogen-fixing Frankia spp. to understand metal management in the rhizosphere of actinorhizal plants. Metallomics 11: 810-821.

69. Saha, M.*, Berdalet, E., Carotenuto, Y., Fink, P., Tilmann, H., John, U., Not, F., Pohnert, G., Potin, P., Selander, E., Vyverman, W., Wichard, T., Zupo, V., Steinke, M.* (2019) Using chemical language to shape future marine health. Frontiers in Ecology and the Environment. 17:530-537.

68. Kurth, C., Wasmuth, I., Wichard, T., Pohnert, G., Nett, M.* (2019) Algae induce siderophore biosynthesis in the freshwater bacterium Cupriavidus necator H16. Biometals 32: 77-88.

67. Steinhagen, S.*, Barco, A., Wichard, T., Weinberger, F. (2019) Conspecificity of the model organism Ulva mutabilis and Ulva compressa (Ulvophyceae, Chlorophyta). Journal of Phycology 55: 25-36.

66. Kügler, S., Cooper, R.,E., Wegner, C.-E., Mohr, J.F., Wichard, T., Küsel, K.* (2019) Iron-organic matter complexes accelerate microbial iron cycling in an iron-rich fen. Science of Total Environment 646: 972-988


65. De Clerck, O.*,  Kao, S-M., Bogaert, K.A., Blomme, J., Foflonker, F., Kwantes, M., Vancaester, E., Vanderstraeten,  L., Aydogdu, E.,  Boesger, J.,  Califano, G., Charrier,  B., Clewes, R., Del Cortona, A., D'Hondt, S., Fernandez-Pozo,  N., Gachon, C.M., Hanikenne, M., Lattermann, L., Leliaert,  F., Liu, X., Maggs, C.A., Popper, Z.A., Raven, J.A., Van Bel, M., Wilhelmsson, P.K.I., Bhattacharya, D., Coates, J.C., Rensing, S.A., Van Der Straeten, D., Vardi, A., Sterck, L., Vandepoele, K., Van de Peer, Y., Wichard, T., Bothwell, J.H.* (2018) Insights into the Evolution of Multicellularity from the Sea Lettuce Genome. Current Biology 28: 2921-2933.

64. Wichard, T.*, Beemelmanns, C. (2018) Role of chemical mediators in aquatic interactions across the prokaryote-eukaryote boundary. Journal of Chemical Ecology 44: 1008-1021.

63. Hermenau, R., Keishi, I., Gama, S., Hoffmann, B., Pfeifer-Leeg, M., Plass, W., Mohr, J.F., Wichard, T., Saluz H.,P., Hertweck, C.* (2018) Gramibactin is a bacterial siderophore with a diazeniumdiolate ligand system. Nature Chemical Biology 14: 841-843. Online

62. Baumeister, T. U. H., Ueberschaar, N., Schmidt-Heck, W., Mohr, J. F., Deicke, M., Wichard, T.*, Guthke, R., Pohnert, G.* (2018) DeltaMS: A tool to track isotopologues in GC- and LC-MS data. Metabolomics 14:41

61. Kessler, R.W., Weiss, A., Kuegler, S., Hermes, C. Wichard, T.* (2018) Macroalgal-bacterial interactions: Role of dimethylsulfoniopropionate in microbial gardening by Ulva (Chlorophyta). Molecular Ecology 27: 1808-1819

60. Vockenberg, T.*, Wichard, T., Stelter, M., Bräutigam, P. (2018) Einfluss von Alterungsprozessen auf das Sorptionsverhalten von Mikroschadstoffen an Mikroplastik. Mitteilungen zur Umweltchemie und Ökotoxikologie 24, 10-13

59. Protocols for Macroalgae Research, eds. B. Charrier*, T. Wichard*, C.R.K. Reddy* (2018) Preface/Editorial. Boca Raton: CRC Press, Francis & Taylor Group

58. Kessler, R.W., Alsufyani, T., Wichard, T.* (2018) Purification of sporulation and swarming inhibitors from Ulva: application in algal life cycle controlling. In Protocols for Macroalgae Research, eds. B. Charrier, T. Wichard, C.R.K. Reddy, Chapter 8. Boca Raton: CRC Press, Francis & Taylor Group

57. Califano, G., Wichard, T.* (2018) Preparation of axenic cultures in Ulva (Chlorophyta). In Protocols for Macroalgae Research, eds. B. Charrier, T. Wichard, C.R.K. Reddy, Chapter 9. Boca Raton: CRC Press, Francis & Taylor Group

56. Kuhlisch, C., Califano, G., Wichard, T., Pohnert, G.* (2018) Metabolomics of intra- and extracellular metabolites from micro- and macroalgae using GC-MS and LC-MS. In Protocols for Macroalgae Research, eds. B. Charrier, T. Wichard, C.R.K. Reddy, Chapter 18. Boca Raton: CRC Press, Francis & Taylor Group

55. Bösger, J., Kwantes, M., Wichard, T* (2018) Polyethylene glycol (PEG)-mediated transformation in the green macroalgae Ulva mutabilis (Chlorophyta): a forward genetic approach. In Protocols for Macroalgae Research, eds. B. Charrier, T. Wichard, C.R.K. Reddy, Chapter 31. Boca Raton: CRC Press, Francis & Taylor Group 


54. Ghaderiardakani, F., Coates, J.C., Wichard T.* (2017) Bacteria-induced morphogenesis of Ulva intestinalis and Ulva mutabilis (Chlorophyta): a contribution to the lottery theory. FEMS Microbiology Ecology 93(8):fix094

53. Charrier, B.*, Abreu, M.H., Araujo, R., Bruhn, A., Coates, J.C., De Clerck, O., Katsaros, C., Robaina, R.R., Wichard, T. (2017) Furthering knowledge on seaweed growth and development to facilitate sustainable aquaculture. New Phytologist 216: 967-975

52. Kessler, R.W., Crecelius, A.C.*, Schubert, U.S., Wichard, T.* (2017) In situ monitoring of molecular changes during cell differentiation processes in marine macroalgae through mass spectrometric imaging. Analytical Bioanalytical Chemistry 409: 4893-4903. doi:10.1007/s00216-017-0430-7 

51. Wichard, T.* and Katsaros, C. (2017) Phycomorph: macroalgal development and morphogenesis. Botanica Marina 60(2): 85-87. doi:10.1515/bot-2017-0017

50. Wichard, T.* (2017) Was den Meersalat in Form bringt. Nachrichten aus der Chemie 65: 870-873

49. Weiss, A., Costa, R., Wichard, T.* (2017) Morphogenesis of Ulva mutabilis (Chlorophyta) induced by Maribacter species (Bacteroidetes, Flavobacteriaceae). Botanica Marina 60(2): 197-206. doi:10.1515/bot-2016-0083

48. Katsaros, C., Weiss, A., Llangos, I., Theodorou, I., Wichard, T.* (2017) Cell structure and microtubule organisation during gametogenesis of Ulva mutabilis Føyn (Chlorophyta) Botanica Marina 60(2):123-135. doi:10.1515/bot-2016-0073

47. Fernand, F., Israel, A., Skjermo, J., Wichard T.,  Timmermans, K. R.,  Golberg A.* (2017) Offshore macroalgae biomass for bioenergy production: Environmental aspects, technological achievements and challenges. Renewable and Sustainable Energy Reviews. 75: 35-45.

46. Alsufyani, T., Weiss, A., Wichard, T.* (2017) Time Course Exo-Metabolomic Profiling in the Green Marine Macroalga Ulva (Chlorophyta) for Identification of Growth Phase-Dependent Biomarkers. Marine Drugs 15: 14. doi:10.3390/md15010014

45. Kuhlisch, C.,  Deicke, M., Ueberschaar,  N., Wichard,  T., Pohnert, G.* (2017) A fast and direct liquid chromatography-mass spectrometry method to detect and quantify polyunsaturated aldehydes and polar oxylipins in diatoms. Limnology and Oceanography Methods 15:70-79. doi:10.1002/lom3.10143


44. Wichard, T.* (2016) Bakterien-Algen-Interaktionen: Die Grünalge Ulva (Chlorophyta) kommt nur mit den richtigen Bakterien in Form [In: Rundgespräche Forum Ökologie, Bd. 45 »Die Sprache der Moleküle - Chemische Kommunikation in der Natur«, S. 69-82. 2016 Verlag Dr. Friedrich Pfeil, München].  

43. Wichard, T.* (2016) Bakterien-induzierte Morphogenese der marinen Makroalge. BIOspektrum 22:585-588. doi:10.1007/s12268-016-0732-x

42. Wichard, T.* (2016) Identification of Metallophores and Organic Ligands in the Chemosphere of the Marine Macroalga Ulva (Chlorophyta) and at Land-Sea Interfaces. Frontiers in Marine Science 3:131. doi: 10.3389/fmars.2016.00131

41. Noumsi, J., C., Pourhassan, N., Darnajoux, R., Deicke, M., Wichard, T., Burrus, V., Bellenger, J-B.* (2016) Effect of organic matter on nitrogenase metal cofactors homeostasis in Azotobacter vinelandii under diazotrophic conditions. Environmental Microbiology Reports, 8: 76-84. doi: 10.1111/1758-2229.12353

40. Grueneberg, J., Engelen, A.H., Costa R., Wichard T.* (2016) Macroalgal morphogenesis induced by waterborne compounds and bacteria in coastal seawater. PLoS ONE 11: e0146307. doi:10.1371/journal.pone.0146307


39. Oertel, W., Wichard, T.*, Weissgerber, A. (2015) Transformation of Ulva mutabilis (Chlorophyta) by vector plasmids integrating into the genome. Journal of Phycology 51:963-979, doi: 10.1111/jpy.12336

38. Wichard, T.* (2015) Exploring bacteria-induced growth and morphogenesis in the green macroalga order Ulvales (Chlorophyta). Frontiers in Plant Science 6:86. doi: 10.3389/fpls.2015.00086

37. Wichard, T.*, Charrier B., Mineur F., Bothwell J. H., De Clerck O.,  Coates J. C. (2015) The green seaweed Ulva: A model system to study morphogenesis. Front. Plant Sci. 6:72. doi: 10.3389/fpls.2015.00072

36. Vesty, E.F., Kessler, R. W., Wichard, T.*, Coates, J.C.* (2015) Regulation of gametogenesis and zoosporogenesis in Ulva linza (Chlorophyta): comparison with Ulva mutabilis and potential for laboratory culture. Frontiers in Plant Science 6:15. doi: 10.3389/fpls.2015.00015

35. Pourhassan, N., Wichard, T., Roy, S., Bellenger, J-B.* (2015) Impact of elevated CO2 on metal homeostasis and the actinorhizal symbiosis in early successional alder shrubs. Environmental and Experimental Botany 109: 168-176


34. Deicke, M., Mohr, J. F., Bellenger, J. P., Wichard, T.* (2014) Metallophore mapping in complex matrices by metal isotope coded profiling of organic ligands. Analyst, 23, 6096 - 6099

33. Alsufyani, T., Engelen, A.H., Diekmann, O.E., Kuegler, S., Wichard,  T.* (2014) Prevalence and mechanism of polyunsaturated aldehydes production in the green tide forming macroalgal genus Ulva (Ulvales, Chlorophyta). Chemistry and Physics of Lipids, 183, 100-109

32. Pourhassan, N., Gagnon, R., Wichard, T., Bellenger, J-B.* (2014) Identification of the hydroxamate siderophore ferricrocin in Cladosporium cladosporioides. Natural Product Communications, 9, 539-540

31. Ribalet, F., Bastianini, M., Vidoudez, C., Acri, F., Berges, J., Ianora, A., Miralto, A., Pohnert, G., Romano, G., Wichard, T.,  Casotti, R.* (2014) Phytoplankton cell lysis associated with polyunsaturated aldehyde release in the northern Adriatic Sea. PLoSOne,DOI:10.1371/journal.pone.0085947


30. Deicke, M., Bellenger, J. P., Wichard, T.* (2013) Direct quantification of bacterial molybdenum and iron metallophores with ultra-high-performance liquid chromatography coupled to time-of-flight mass spectrometry. Journal of Chromatography A, 1258, 50-60


29. Spoerner, M., Wichard, T.*, Bachhuber, T., Stratmann, J., Oertel, W. (2012) Growth and Thallus Morphogenesis of Ulva mutabilis (Chlorophyta) depends on a combination of two bacterial species excreting regulatory factors. Journal of Phycology 48, 1433-1447


28. Bellenger, J. P., Wichard, T., Xu, Y., and Kraepiel, A. M. L.* (2011) Essential metals for nitrogen fixation in a free-living N2-fixing bacterium: chelation, homeostasis and high use efficiency. Environmental Microbiology 13, 1395-1411


27. Dittami, S. M.*, Wichard, T.,  Malzahn, A. M., Pohnert, G., Boersma, M., Wiltshire, K. H. (2010)  Culture conditions affect fatty acid content along with wound-activated production of polyunsaturated aldehydes in Thalassiosira rotula (Coscinodiscophyceae). Nova Hedwigia Beiheft, 136, 231-248

26. Wichard, T.*, Oertel, W. (2010) Gametogenesis and Gamete release of Ulva mutabilis and Ulva lactuca (Chlorophyta): Regulatory effects and chemical characterization of the "swarming inhibitor". Journal of Phycology 46, 248-259


25. Wichard, T.*, Bellenger, J. P., Morel, F. M. M., and Kraepiel, A. M. L. (2009) Role of the Siderophore Azotobactin in the Bacterial Acquisition of Nitrogenase Metal Cofactors. Environmental Science & Technology 43, 7218-7224

24. Wichard, T., Mishra, B.*, Myneni, S. C. B., Bellenger, J. P., and Kraepiel, A. M. L. (2009) Storage and bioavailability of molybdenum in soils increased by organic matter complexation. Nature Geoscience 2, 625-629

23. Kraepiel, A. M. L.*, Bellenger, J. P., Wichard, T., and Morel, F. M. M. (2009) Multiple roles of siderophores in free-living nitrogen-fixing bacteria. Biometals 22, 573-581


22. Wichard, T., Bellenger, J. P., Loison, A., and Kraepiel, A. M. L.* (2008) Catechol siderophores control tungsten uptake and toxicity in the nitrogen-fixing bacterium Azotobacter vinelandii. Environmental Science & Technology 42, 2408-2413

21. Wichard, T.*, Poulet, S. A., Boulesteix, A. L., Ledoux, J. B., Lebreton, B., Marchetti, J., and Pohnert, G. (2008) Influence of diatoms on copepod reproduction. II. Uncorrelated effects of diatom-derived alpha,beta,gamma,delta-unsaturated aldehydes and polyunsaturated fatty acids on Calanus helgolandicus in the field. Progress in Oceanography 77, 30-44

20. Bellenger, J. P., Wichard, T., and Kraepiel, A. M. L.* (2008) Vanadium requirements and uptake kinetics in the dinitrogen-fixing bacterium Azotobacter vinelandii. Applied and Environmental Microbiology 74, 1478-1484

19. Bellenger, J. P., Wichard, T., Kustka, A. B., and Kraepiel, A. M. L.* (2008) Uptake of molybdenum and vanadium by a nitrogen-fixing soil bacterium using siderophores. Nature Geoscience 1, 243-246

18. Koski, M.*, Wichard, T., and Jonasdottir, S. H. (2008) "Good" and "bad" diatoms: development, growth and juvenile mortality of the copepod Temora longicornis on diatom diets. Marine Biology 154, 719-734


17. Wichard, T., Gerecht, A., Boersma, M., Poulet, S. A., Wiltshire, K., and Pohnert, G.* (2007) Lipid and fatty acid composition of diatoms revisited: Rapid wound-activated change of food quality parameters influences herbivorous copepod reproductive success. Chembiochem 8, 1146-1153

16. Poulet, S. A.*, Cueff, A., Wichard, T., Marchetti, J., Dancie, C., and Pohnert, G. (2007) Influence of diatoms on copepod reproduction. III. Consequences of abnormal oocyte maturation on reproductive factors in Calanus helgolandicus. Marine Biology 152, 415-428

15. Poulet, S. A., Escribano, R., Hidalgo, P., Cueff, A., Wichard, T., Aguilera, V., Vargas, C. A., and Pohnert, G. (2007) Collapse of Calanus chilensis reproduction in a marine environment with high diatom concentration. Journal of Experimental Marine Biology and Ecology 352, 187-199

14. Ribalet, F., Wichard, T., Pohnert, G., Ianora, A., Miralto, A., and Casotti, R.* (2007) Age and nutrient limitation enhance polyunsaturated aldehyde production in marine diatoms. Phytochemistry 68, 2059-2067


13. Wichard, T., and Pohnert, G.* (2006) Formation of halogenated medium chain hydrocarbons by a lipoxygenase/hydroperoxide halolyase-mediated transformation in planktonic microalgae. Journal of the American Chemical Society 128, 7114-7115

12. Poulet, S. A.*, Wichard, T., Ledoux, J. B., Lebreton, B., Marchetti, J., Dancie, C., Bonnet, D., Cueff, A., Morin, P., and Pohnert, G. (2006) Influence of diatoms on copepod reproduction. I. Field and laboratory observations related to Calanus helgolandicus egg production. Marine Ecology-Progress Series 308, 129-142

11. Stumpe, M., Bode, J., Gobel, C., Wichard, T., Schaaf, A., Frank, W., Frank, M., Reski, R., Pohnert, G., and Feussner, N.* (2006) Biosynthesis of C9-aldehydes in the moss Physcomitrella patens. Biochimica Et Biophysica Acta-Molecular and Cell Biology of Lipids 1761, 301-312


10. Wichard, T., Gobel, C., Feussner, I., and Pohnert, G.* (2005) Unprecedented lipoxygenase/hydroperoxide lyase pathways in the moss Physcomitrella patens. Angewandte Chemie-International Edition 44, 158-161

9. Wichard, T., Poulet, S. A., Halsband-Lenk, C., Albaina, A., Harris, R., Liu, D. Y., and Pohnert, G.* (2005) Survey of the chemical defence potential of diatoms: Screening of fifty one species for alpha,beta,gamma,delta-unsaturated aldehydes. Journal of Chemical Ecology 31, 949-958

8. Wichard, T., Poulet, S. A., and Pohnert, G.* (2005) Determination and quantification of alpha,beta,gamma,delta-unsaturated aldehydes as pentafluorobenzyl-oxime derivates in diatom cultures and natural phytoplankton populations: application in marine field studies. Journal of Chromatography B-Analytical Technologies in the Biomedical and Life Sciences 814, 155-161

7. Carotenuto, Y.*, Wichard, T., Pohnert, G., and Lampert, W. (2005) Life-history responses of Daphnia pulicaria to diets containing freshwater diatoms: Effects of nutritional quality versus polyunsaturated aldehydes. Limnology and Oceanography 50, 449-454

6. Horner, R. A.*, Postel, J. R., Halsband-Lenk, C., Pierson, J. J., Pohnert, G., and Wichard, T. (2005) Winter-spring phytoplankton blooms in Dabob Bay, Washington. Progress in Oceanography 67, 286-313

5. Paffenhöfer, G. A.*, Ianora, A., Miralto, A., Turner, J. T., Kleppel, G. S., d'Alcala, M. R., Casotti, R., Caldwell, G. S., Pohnert, G., Fontana, A., Müller-Navarra, D., Jonasdottir, S., Armbrust, V., Bamstedt, U., Ban, S., Bentley, M. G., Boersma, M., Bundy, M., Buttino, I., Calbet, A., Carlotti, F., Carotenuto, Y., d'Ippolito, G., Frost, B., Guisande, C., Lampert, W., Lee, R. F., Mazza, S., Mazzocchi, M. G., Nejstgaard, J. C., Poulet, S. A., Romano, G., Smetacek, V., Uye, S., Wakeham, S., Watson, S., and Wichard, T. (2005) Colloquium on diatom-copepod interactions. Marine Ecology-Progress Series 286, 293-305

4. Senger, T., Wichard, T., Kunze, S., Gobel, C., Lerchl, J., Pohnert, G.*, and Feussner, I. (2005) A multifunctional lipoxygenase with fatty acid hydroperoxide cleaving activity from the moss Physcomitrella patens. Journal of Biological Chemistry 280, 7588-7596


3. Pohnert, G.*, Adolph, S., and Wichard, T. (2004) Short synthesis of labeled and unlabeled 6Z,9Z,12Z,15-hexadecatetraenoic acid as metabolic probes for biosynthetic studies on diatoms. Chemistry and Physics of Lipids 131, 159-166

2. Ianora, A.*, Miralto, A., Poulet, S. A., Carotenuto, Y., Buttino, I., Romano, G., Casotti, R., Pohnert, G., Wichard, T., Colucci-D'Amato, L., Terrazzano, G., and Smetacek, V. (2004) Aldehyde suppression of copepod recruitment in blooms of a ubiquitous planktonic diatom. Nature 429, 403-407

1. Adolph, S., Bach, S., Blondel, M., Cueff, A., Moreau, M., Pohnert, G., Poulet, S. A.*, Wichard, T., and Zuccaro, A. (2004) Cytotoxicity of diatom-derived oxylipins in organisms belonging to different phyla. Journal of Experimental Biology 207, 2935-2946

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