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Humboldt-Universitaet zu Berlin - Department of Biology

Dr. Thomas Janßen

Späth-Arboretum der Humboldt-Universität

Curator of the botanical collections

Späthstr. 80/81

12437 Berlin

Phone +49-(0)30 2093 98365

Fax +49-(0)30 2093 98366

thomas.janssen(a)biologie.hu-berlin.de

 

 

 

CV

2011 Research assistant and curator of the Späth-Arboretum and the herbarium BHU (Humboldt-Universität zu Berlin)
2010 Research assistant and editor of the series "Flore d'Afrique centrale" (Botanischer Garten Meise, Belgien)
2007 PostDoc in the project "Sustainable Use of Natural Resources in West Africa (SUN)" (Senckenberg Research Institute, Frankfurt)
2007 Binational PhD (Muséum national d’Histoire naturelle, Paris & University of Göttingen)
2003 Diplôme d’études approfondies (DEA) de systématique animale et végétale (Muséum national d’Histoire naturelle, Paris)
2002 Maîtrise de physiologie et biologie cellulaire (Ecole normale supérieure, Paris & Université Paris VI)
2000 Vordiplom in Biochemistry and Molecular Biology (University of Jena)

 

Research interests

Systematics and evolution of "ferns", i.e. monilophytes and lycophytes (especially Cyatheaceae, Pteridaceae, Aspleniaceae), particularly in Africa

bioinformatic methods in taxonomy and systematics

collection management and presentation

 

Fieldwork

Burkina Faso, Democratic Republic of Congo, Europe, Madagascar, Mascarenes, Russia, Seychelles, Sri Lanka, Tanzania

 

Courses

botanical systematics, plant geography, plant identification, geobotanical excursion, methods of organismal botany, morphology

 

Professional memberships

American Fern Society

British Pteridological Society

Deutsche Botanische Gesellschaft (secretary)

Gesellschaft für Biologische Systematik

Verband Botanischer Gärten

 

Publications

Journal articles

Bocksberger G, Schnitzler J, Chatelain C, Daget P, Janssen T, Schmidt M, Thiombiano A, Zizka G (2016) Climate and the distribution of grasses in West Africa. Journal of Vegetation Science 27: 306-317.

Mangambu Mokoso JD, Muhashy F, Robbrecht E, Janssen T, Ntahobavuka Habimana H, van Diggelen R (2015) Ptéridophytes: Bioindicateurs des changements opérés sur la structure des forêts de zone de montagnes du Parc National de Kahuzi-Biega à l’Est de la R.D. Congo [Ferns and Fern Allies: Bio indicators of changes occurred in the structure of the mountain forests within the Kahuzi-Biega National Park in Eastern D.R. Congo]. International journal of Innovation and Scientific Research 16: 350-370.

Mangambu Mokoso JD, Muhashy F, Janssen T, van Diggelen R, Robbrecht E, Ntahobavuka Habimana H (2013) Diversité des Fougères et leurs alliées le long du gradient altitudinal au sein de l’écosystème forestier des montagnes du Parc National de Kahuzi-Biega (RD CONGO). International Journal of Environmental Studies 70: 259-283.

Schmidt M, Janssen T, Dressler S, Hahn K, Hien M, Konaté S, Lykke AM, Mahamane A, Sambou B, Sinsin B, Thiombiano A, Wittig R, Zizka G (2012) The West African Vegetation Database. Biodiversity & Ecology 4: 105-110.

Zwarg A, Schmidt M, Janssen T, Hahn K, Zizka G (2012) Plant diversity, functional traits and soil conditions of grass savannas on lateritic crusts (bowé) in south eastern Burkina Faso. Flora et Vegetatio Sudano-Sambesica 15: 15-24.

Hovenkamp P, Janssen T, Kirkup D, de Kok R, Sierra SEC, Smets E, Webb C, van Welzen PC (2011) e-Flora Malesiana: state of the art and perspectives. Gardens’ Bulletin Singapore 63: 189-195.

Janssen T, Schmidt M, Dressler S, Hahn K, Hien M, Konaté S, Lykke AM, Mahamane A, Sambou B, Sinsin B, Thiombiano A, Wittig R, Zizka G (2011) Addressing data property rights concerns and providing incentives for collaborative data pooling: the West African Vegetation Database approach. Journal of Vegetation Science 22: 614-620.

Ranil RHG, Pushpakumara DKNG, Janssen T, Fraser-Jenkins CR, Wijesundara DSA (2011) Conservation Priorities for Tree Ferns (Cyatheaceae) in Sri Lanka. Taiwania 56: 201-209.

Ranil RHG, Pushpakumara DKNG, Janssen T, Wijesundara DSA, Dhanasekara DUMB (2010) Cyathea srilankensis Ranil (Cyatheaceae): A new tree fern species from Sri Lanka. American Fern Journal 100:39-44.

Ranil RHG, Pushpakumara DKNG, Janssen T, Fraser-Jenkins CR, Wijesundara DSA (2010) Cyathea sledgei (Cyatheaceae) : A new species of tree fern from Sri Lanka. Fern Gazette 18: 318-325.

Otto E, Janssen T, Kreier H-P, Schneider H (2009) New insights into the phylogeny of Polypodium, Pleopeltis, and related Neotropical genera (Polypodiaceae, Polypodiopsida). Molecular Phylogenetics and Evolution 53: 190-201.

Janssen T, Rakotondrainibe F (2008) A revision of the indusiate scaly tree ferns (Cyatheaceae: Cyathea subgen. Alsophila sect. Alsophila) in Madagascar, the Comoros and the Seychelles. Adansonia 30(2): 221-376.

Brunken U, Schmidt M, Dressler S, Janssen T, Thiombiano A, Zizka G (2008) www.westafricanplants.senckenberg.de - An image-based identification tool for West African plants. Taxon 57: 1027-1028.

Janssen T, Dressler S, Schmidt M, Zizka G (2008) Ein Biodiversitätsdaten-Netzwerk für Westafrika. Natur und Museum 138: 155.

Janssen T, Bystriakova N, Rakotondrainibe F, Coomes D, Labat J-N, Schneider H (2008) Neoendemism in Madagascan tree ferns results from recent, coincident diversification bursts. Evolution 62: 1876-1889.

Schneider H, Kreier H-P, Hovenkamp P, Janssen T. (2008) Phylogenetic relationships of the fern genus Christiopteris shed new light onto the classification and biogeography of drynarioid ferns. Botanical Journal of the Linnean Society 157: 645-656.

Janssen T, Rakotondrainibe F (2007) An update of the revision of Cyathea subgen. Alsophila sect. Gymnosphaera (Cyatheaceae) in Madagascar and the Comoros including a discussion of putative hybridization events. Adansonia 29: 195-213.

Janssen T, Kreier H-P, Schneider H (2007) Origin and diversification of African ferns with special emphasis on Polypodiaceae. Brittonia 59: 159-181.

Janssen T, Rakotondrainibe F (2006) A revision of the fern family Cyatheaceae in the Mascarenes. Adansonia 28: 213- 241.

Janssen T (2006) A moulding method to preserve tree fern trunk surfaces including remarks on the composition of tree fern herbarium specimens. Fern Gazette 17: 283-295.

Bremer K, Janssen T (2006) Gondwanan origin of major monocot groups inferred from dispersal-vicariance analysis. ALISO: Monocots Proceedings 22: 22-27.

Janssen T, Schneider H (2005) Exploring the evolution of humus collecting leaves in drynarioid ferns (Polypodiaceae, Polypodiidae) based on phylogenetic evidence. Plant Systematics and Evolution 252: 175-197.

Schneider H, Janssen T, Hovenkamp P, Smith AR, Haufler CH, Ranker TA (2004) Phylogenetic relationships of the enigmatic Malesian fern Thylacopteris (Polypodiaceae, Polypodiidae). International Journal of Plant Sciences 165(6): 1077-1087.

Janssen T, Bremer K (2004) The age of major monocot groups inferred from 800+ rbcL sequences. Botanical Journal of the Linnean Society 146: 385-398.

 

Book chapters

Janssen T (2010) Etat actuel de la biodiversité du Burkina Faso - Les plantes vasculaires: Les fougères. Pp. 174-183 in: Thiombiano A, Kampmann D (eds.) Atlas de la Biodiversité de l’Afrique de l’Ouest, Tome II: Burkina Faso. Ouagadougou & Frankfurt/Main.

Schneider H, Janssen T, Bystriakova N, Heinrichs J, Hennequin S, Rakotondrainibe F (2010) Rapid radiations and neoendemism in the Madagascan biodiversity hotspot. Pp. 3-15 in: Glaubrecht M (ed.) Evolution in Action. Springer, Berlin.

Schneider H, Kreier H-P, Janssen T, Otto E, Muth H, Heinrichs J (2010) Key innovations versus key opportunities: Identifying causes for rapid radiations in derived ferns. Pp. 61-75 in: Glaubrecht M (ed.) Evolution in Action. Springer, Berlin.

Janssen T (2009) Cyathéacées. Pp. 147-163 in: Bosser J, Badré F, Guého J (eds.) Flore des Mascareignes – Ptéridophytes. IRD éditions, Marseille.

Anderson C, Janssen T (2009) Monocots. Pp. 203-212 in: Hedges SB, Kumar S (eds.) The Timetree of Life. Oxford University Press, Oxford.