Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Corrigendum to Efficient distinction of invasive aquatic plant species from non-invasive related species using DNA barcoding
    Ghahramanzadeh, R. ; Esselink, G.D. ; Kodde, L.P. ; Duistermaat, H. ; Valkenburg, J.L.C.H.S. Van; Marashi, H. ; Smulders, M.J.M. ; Wiel, C.C.M. Van de - \ 2015
    Molecular Ecology Resources 15 (2015)1. - ISSN 1755-098X - p. 230 - 230.
    Efficient distinction of invasive aquatic plant species from non-invasive related species using DNA barcoding
    Ghahramanzadeh, R. ; Esselink, G. ; Kodde, L.P. ; Duistermaat, H. ; Valkenburg, J.L.C.H. van; Marashi, S.H. ; Smulders, M.J.M. ; Wiel, C.C.M. van de - \ 2013
    Molecular Ecology Resources 13 (2013)1. - ISSN 1755-098X - p. 21 - 31.
    land plants - identifications - alignment - region - gap
    Biological invasions are regarded as threats to global biodiversity. Among invasive aliens, a number of plant species belonging to the genera Myriophyllum, Ludwigia and Cabomba, and to the Hydrocharitaceae family pose a particular ecological threat to water bodies. Therefore, one would try to prevent them from entering a country. However, many related species are commercially traded, and distinguishing invasive from non-invasive species based on morphology alone is often difficult for plants in a vegetative stage. In this regard, DNA barcoding could become a good alternative. In this study, 242 samples belonging to 26 species from 10 genera of aquatic plants were assessed using the chloroplast loci trnH-psbA, matK and rbcL. Despite testing a large number of primer sets and several PCR protocols, the matK locus could not be amplified or sequenced reliably and therefore was left out of the analysis. Using the other two loci, eight invasive species could be distinguished from their respective related species, a ninth one failed to produce sequences of sufficient quality. Based on the criteria of universal application, high sequence divergence and level of species discrimination, the trnH-psbA noncoding spacer was the best performing barcode in the aquatic plant species studied. Thus, DNA barcoding may be helpful with enforcing a ban on trade of such invasive species, such as is already in place in the Netherlands. This will become even more so once DNA barcoding would be turned into machinery routinely operable by a nonspecialist in botany and molecular genetics.
    Soils on exposed Sunda Shelf shaped biogeographic patterns in the equatorial forests of Southeast Asia
    Slik, J.W.F. ; Aiba, S.I. ; Bastian, M. ; Brearley, F.Q. ; Cannon, C.H. ; Eichhorn, K.A.O. ; Fredriksson, G. ; Kartawinata, K. ; Laumonier, Y. ; Mansor, A. ; Marjokorpi, A. ; Meijaard, E. ; Morley, R.J. ; Nagamasu, H. ; Nilus, R. ; Nurtjahya, E. ; Payne, J. ; Permana, A. ; Poulsen, A.D. ; Raes, N. ; Riswan, S. ; Schaik, C.P. ; Sheil, D. ; Sidiyasa, K. ; Suzuki, E. ; Valkenburg, J.L.C.H. van; Webb, C.O. ; Wich, S. ; Yoneda, T. ; Zakaria, R. ; Zweifel, N. - \ 2011
    Proceedings of the National Academy of Sciences of the United States of America 108 (2011)30. - ISSN 0027-8424 - p. 12343 - 12347.
    last glacial maximum - carbon stocks - vegetation - east - sea - environments - biodiversity - indicators - climate - borneo
    The marked biogeographic difference between western (Malay Peninsula and Sumatra) and eastern (Borneo) Sundaland is surprising given the long time that these areas have formed a single landmass. A dispersal barrier in the form of a dry savanna corridor during glacial maxima has been proposed to explain this disparity. However, the short duration of these dry savanna conditions make it an unlikely sole cause for the biogeographic pattern. An additional explanation might be related to the coarse sandy soils of central Sundaland. To test these two nonexclusive hypotheses, we performed a floristic cluster analysis based on 111 tree inventories from Peninsular Malaysia, Sumatra, and Borneo. We then identified the indicator genera for clusters that crossed the central Sundaland biogeographic boundary and those that did not cross and tested whether drought and coarse-soil tolerance of the indicator genera differed between them. We found 11 terminal floristic clusters, 10 occurring in Borneo, 5 in Sumatra, and 3 in Peninsular Malaysia. Indicator taxa of clusters that occurred across Sundaland had significantly higher coarse-soil tolerance than did those from clusters that occurred east or west of central Sundaland. For drought tolerance, no such pattern was detected. These results strongly suggest that exposed sandy sea-bed soils acted as a dispersal barrier in central Sundaland. However, we could not confirm the presence of a savanna corridor. This finding makes it clear that proposed biogeographic explanations for plant and animal distributions within Sundaland, including possible migration routes for early humans, need to be reevaluated.
    De ontwikkeling van een informatiesysteem voor invasieve plantensoorten
    Duistermaat, L. ; Valkenburg, J. van; Speek, T.A.A. ; Wiel, C.C.M. van de; Smulders, M.J.M. ; Moorsel, R. van; Lotz, B. - \ 2011
    Gewasbescherming 42 (2011)2. - ISSN 0166-6495 - p. 53 - 57.
    geïntroduceerde soorten - verspreiding van planten - inventarisaties - ecologische risicoschatting - risicobeheersing - databanken - introduced species - plant dispersal - inventories - ecological risk assessment - risk management - databases
    De laatste decennia kent de Nederlandse flora een sterke toename van exoten. Soorten die door een sterke uitbreiding of verdichting van hun areaal overlast veroorzaken, worden invasieve soorten genoemd. De overlast van invasieve soorten (vaak kortweg invasieven genoemd) kan bestaan uit economische schade en gezondheids- en/of veiligheidsproblemen. Het Ministerie van Landbouw, Natuur en Voedselkwaliteit heeft daarom het Uitvoeringsconsortium Invasieve Plantensoorten een FES‑subsidie verleend om in vier jaar tijd een informatiesysteem over potentieel invasieve exotische plantensoorten op te zetten. Doel is informatie aan te leveren op basis waarvan ingeschat kan worden hoe groot de kans is dat exotische soorten zich bij introductie in Nederland invasief zullen gaan gedragen. Daarnaast is het doel hulp te bieden bij het herkennen van zulke soorten als ze worden geïmporteerd. Het informatiesysteem is ondergebracht in Q-bank.
    Sosef, M.S.M. ; Valkenburg, J.L.C.H. van - \ 2010
    In: Flore du Gabon 41 : Anthericaceae, Burmanniaceae, Colchicaceae, Crassulaceae, Dipterocarpaceae, Lemnaceae, Pittosporaceae, Rosaceae / L. Ngok Banak M.S.M. Sosef, J. Florence, Weikersheim : Margraf Publishers - ISBN 9783823615972 - p. 40 - 44.
    DNA barcoding discriminates the noxious invasive species, floating pennywort (Hydrocotyle ranunculoides L.f.), from non-invasive relatives
    Wiel, C.C.M. van de; Schoot, J. van der; Valkenburg, J.L.C.H. van; Duistermaat, H. ; Smulders, M.J.M. - \ 2009
    Molecular Ecology Resources 9 (2009)4. - ISSN 1755-098X - p. 1086 - 1091.
    land plants - genetics
    Floating pennywort (Hydrocotyle ranunculoides L.f.), a member of the plant family Araliaceae originating from North America, is an example of an invasive aquatic species posing serious problems to the management of waterways outside of its original distribution area in Australia and Western Europe. As a consequence, its import was banned in the Netherlands. It can be difficult to distinguish H. ranunculoides from other species of the genus on a morphological basis. In this regard, DNA barcoding may become a good alternative once this could be performed on a routine basis. In this study, we show that it is possible to distinguish H. ranunculoides from a series of closely related congeners by using a single plastid DNA sequence, trnH-psbA
    A revision of the genus Podococcus
    Valkenburg, J.L.C.H. van; Sunderland, T. - \ 2008
    Kew Bulletin 63 (2008)2. - ISSN 0075-5974 - p. 251 - 260.
    A taxonomic revision of the palm genus Podococcus (Arecaceae) is presented. Two species are recognised: P. barteri, a species relatively widespread in a coastal band from Nigeria to the D. R. Congo and P. acaulis, a species previously considered conspecific to P. barteri, almost exclusively confined to Gabon. The taxonomic history, morphology, distribution and conservation status of the genus and each species are discussed
    A revision of the genus Scleroperma (Aracaceae)
    Valkenburg, J.L.C.H. van; Sunderland, T. ; Couvreur, T.L.P. - \ 2008
    Kew Bulletin 63 (2008)1. - ISSN 0075-5974 - p. 75 - 86.
    Summary A taxonomic revision of the palm genus Sclerosperma (Arecaceae) is presented. Three species are recognised: S. mannii H. Wendl., which is relatively widespread from Liberia to the Democratic Republic of Congo; S. walkeri A. Chev., which is apparently confined to the interior of Gabon and a band along the Congo River; and S. profiziana, a new species previously considered conspecific to S. mannii that is found in southwest Ghana, Congo, the Democratic Republic of Congo and Angola. The taxonomic history, morphology, distribution and conservation status of the genus and each species are discussed
    The odd man out? Might climate explain the lower tree alpha-diversity of African rain forests relative to Amazonian rain forests?
    Parmentier, I. ; Malhi, Y. ; Senterre, B. ; Whittaker, R.J. ; Alonso, A. ; Balinga, M.P.B. ; Bakayoko, A. ; Bongers, F.J.J.M. ; Chatelain, C. ; Comiskey, J. ; Cortay, R. ; Djuikouo Kamdem, M.N. ; Doucet, J.L. ; Gauier, L. ; Hawthorne, W.D. ; Issembe, Y.A. ; Kouamé, F.N. ; Kouka, L. ; Leal, M.E. ; Lejoly, J. ; Lewis, S.L. ; Newbery, D. ; Nusbaumer, L. ; Parren, M.P.E. ; Peh, K.S.H. ; Phillips, O.L. ; Sheil, D. ; Sonké, B. ; Sosef, M.S.M. ; Sunderland, T. ; Stropp, J. ; Steege, H. ter; Swaine, M. ; Tchouto, P. ; Gemerden, B.S. van; Valkenburg, J. van; Wöll, H. - \ 2007
    Journal of Ecology 95 (2007)5. - ISSN 0022-0477 - p. 1058 - 1071.
    plant-species richness - tropical forests - geographical ecology - equatorial africa - red herrings - dynamics - patterns - scale - disturbance - vegetation
    1. Comparative analyses of diversity variation among and between regions allow testing of alternative explanatory models and ideas. Here, we explore the relationships between the tree alpha-diversity of small rain forest plots in Africa and in Amazonia and climatic variables, to test the explanatory power of climate and the consistency of relationships between the two continents. 2. Our analysis included 1003 African plots and 512 Amazonian plots. All are located in old-growth primary non-flooded forest under 900 m altitude. Tree alpha-diversity is estimated using Fisher's alpha calculated for trees with diameter at breast height >= 10 cm. Mean diversity values are lower in Africa by a factor of two. 3. Climate-diversity analyses are based on data aggregated for grid cells of 2.5 x 2.5 km. The highest Fisher's alpha values are found in Amazonian forests with no climatic analogue in our African data set. When the analysis is restricted to pixels of directly comparable climate, the mean diversity of African forests is still much lower than that in Amazonia. Only in regions of low mean annual rainfall and temperature is mean diversity in African forests comparable with, or superior to, the diversity in Amazonia. 4. The climatic variables best correlated with the tree alpha-diversity are largely different in the African and Amazonian data, or correlate with African and Amazonian diversity in opposite directions. 5. These differences in the relationship between local/landscape-scale alpha-diversity and climate variables between the two continents point to the possible significance of an array of factors including: macro-scale climate differences between the two regions, overall size of the respective species pools, past climate variation, other forms of long-term and short-term environmental variation, and edaphics. We speculate that the lower alpha-diversity of African lowland rain forests reported here may be in part a function of the smaller regional species pool of tree species adapted to warm, wet conditions. 6. Our results point to the importance of controlling for variation in plot size and for gross differences in regional climates when undertaking comparative analyses between regions of how local diversity of forest varies in relation to other putative controlling factors.
    Scleroperma and Podococcus
    Valkenburg, J.L.C.H. van; Sunderland, T. ; Ngok Banak, L.N. ; Issembe, Y. - \ 2007
    Palms 51 (2007). - ISSN 1523-4495 - p. 76 - 83.
    Owens Chamaleon, Chamaeleo owenii Gray, 1831, in Gabun
    Pauwels, O. ; Valkenburg, J.L.C.H. van; Bohme, W. - \ 2006
    Elaphe / Deutsche Gesellschaft fuer Herpetologie und Terrarienkunde 14 (2006)1. - ISSN 0943-2485 - p. 53 - 54.
    Check-list des plantes vasculaires du Gabon = Checklist of Gabonese vascular plants
    Sosef, M.S.M. ; Wieringa, J.J. ; Jongkind, C.C.H. ; Achoundong, G. ; Azizet Issembe, Y. ; Bedigian, D. ; Berg, R.G. van den; Breteler, F.J. ; Cheek, M. ; Degreef, J. ; Faden, R.B. ; Goldblatt, D. ; Maesen, L.J.G. van der; Ngok Banak, L. ; Niangadouma, R. ; Nzabi, T. ; Nziengui, B. ; Rogers, Z.S. ; Stévart, T. ; Valkenburg, J.L.C.H. van; Walters, H.M.J. ; Wilde, J.J.F.E. de - \ 2006
    Belgium : Le Jardin Botanique de Belgique (Scripta botanica Belgica vol. 35) - ISBN 9789072619693 - 438
    planten - controlelijsten - biodiversiteit - herbaria - specimens - taxonomie - tropisch afrika - gabon - vaatplanten - plants - checklists - biodiversity - herbaria - specimens - taxonomy - tropical africa - gabon - vascular plants
    Novitates Gabonenses 57. Begonia Sosefiana (Begoniaceae) : a new species in section loasibegonia from Gabon
    Wilde, J.J.F.E. de; Valkenburg, J.L.C.H. van - \ 2005
    Blumea 50 (2005)3. - ISSN 0006-5196 - p. 467 - 471.
    A new narrowly endemic Begonia species discovered during recent fieldwork in the northern part of the Doudou Mountains in Gabon is described
    Hyphaene guineensis
    Valkenburg, J.L.C.H. van; Dransfield, J. - \ 2004
    Palms 48 (2004)1. - ISSN 1523-4495 - p. 10 - 16.
    Aucoumea klaineana Pierre
    Valkenburg, J.L.C.H. van - \ 2002
    In: Plant Resources of Tropical Africa. Precursor. / Oyen, L.P.A., Lemmens, R.H.M.J., Wageningen : PROTA programme - p. 46 - 50.
    Rattan in East Kalimantan, Indonesia: species composition, abundance, distribution and growth in some selected sites
    Valkenburg, J.L.C.H. van - \ 2002
    In: Rattan: current research issues and prospects for conservation and sustainable development. : Non-wood forest products 14 / Dransfield, J., Tesoro, F.O., Manokaran, N., Rome : FAO - p. 199 - 223.
    Parameria laevigata (A.L. Juss.) Moldenke
    Valkenburg, J.L.C.H. van - \ 2001
    In: Medicinal and Poisonous Plants 2 / van Valkenburg, J.L.C.H., Bunyapraphatsara, N., Leiden : Backhuys Publishers - p. 402 - 404.
    Ochrosia A.L. Juss.
    Valkenburg, J.L.C.H. van; Hendrian, R. - \ 2001
    In: Medicinal and Poisonous Plants 2 / van Valkenburg, J.L.C.H., Bunyapraphatsara, N., Leiden : Backhuys Publishers - p. 386 - 389.
    Millettia Wight & Arn.
    Valkenburg, J.L.C.H. van - \ 2001
    In: Medicinal and Poisonous Plants 2 / van Valkenburg, J.L.C.H., Bunyapraphatsara, N., Leiden : Backhuys Publishers - p. 376 - 380.
    Melastoma L.
    Valkenburg, J.L.C.H. van; Bunyapraphatsara, N. - \ 2001
    In: Medicinal and Poisonous Plants 2 / van Valkenburg, J.L.C.H., Bunyapraphatsara, N., Leiden : Backhuys Publishers - p. 363 - 366.
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