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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    Eerste Advies Bruinvisonderzoek (Bac-2016-01)
    Meer, Jaap van der; Eijsackers, H.J.P. ; Haelters, Jan ; Bos, O.G. - \ 2016
    IMARES Wageningen UR (rapport / Bac Bac-2016-01) - 15
    dierenwelzijn - wilde dieren - zeezoogdieren - invasie - bijvangst - waterverontreiniging - diergezondheid - mariene ecologie - animal welfare - wild animals - marine mammals - invasion - bycatch - water pollution - animal health - marine ecology
    Ecological impacts of Prosopis invasion in Riverine forests of Kenya
    Muturi, G.M. - \ 2012
    Wageningen University. Promotor(en): Frits Mohren, co-promotor(en): Lourens Poorter; B.N. Kigomo. - S.l. : s.n. - ISBN 9789461734020 - 162
    prosopis - introduced species - invasion - impact - forests - forest ecology - genetic diversity - kenya - prosopis - geïntroduceerde soorten - invasie - impact - bossen - bosecologie - genetische diversiteit - kenya


    Drylands occupy over 41% of the global land surface, with Africa and Asia accounting for 32% of the global total each. Because of poor resource management, resource overexploitation and periodic droughts, drylands have experienced severe land degradation. Land degradation is manifested in vegetation loss or deterioration, soil erosion and salinization of soil and water. In Kenya, drylands occupy over 87% of the land surface, and support about 30% of the national population, over 70% of national livestock and the bulk of wildlife that support the tourist sector. Following the prolonged sahelian droughts of the 1970’s Kenya’s drylands were seriously degraded through extensive loss of ground vegetation cover; thus threatening the survival of local populations, livestock production and sustenance of tourism sector. Subsequently, exotic trees and shrubs were introduced for land rehabilitation and fodder supply. Trees from from Prosopis genus emerged as the most adapted and were widely planted.
    Since introduction, Prosopis species have spread from target rehabilitation sites and invaded riverine and wetlands ecosystems but invasion mechanisms and impacts are not yet well understood. In this study we combined geographical information systems techniques; field, greenhouse and laboratory studies, to evaluate riverine habitat invasibility, invasion impacts, invasiveness of Prosopis species and the composition of invasive Prosopis species in Kenya. The following questions were addressed: 1) What abiotic factors make riverine forests vulnerable to Prosopis invasion?, 2) What are the ecological implications of Prosopis invasion in riverine forests?, 3) What mechanisms underlie inhibition of A. tortilis regeneration by Prosopis species invasion?, 4) What are the species composition in Prosopis invaded areas of Kenya, and 5) What are the implications of our results?
    The present study revealed indiscriminate Prosopis invasion in all land cover and land use types identified through satellite image analysis, field surveys and historical site information provided by local informants. As a result of this trend, we found a contrasting occurrence increase of Prosopis species and decrease of Acacia tortilis between 1998 and 2007. Accordingly, the study has demonstrated that Prosopis species invasion in the Turkwel Riverine forest is invoked more by species invasiveness rather than habitat susceptibility. Consequently, we investigated the invasiveness of Prosopis species by studying invasion impacts and the underpinning mechanisms
    Our study has shown reduction of herbaceous species ground vegetation cover and herbaceous species diversity, and termination of A. tortilis regeneration by Prosopis invasion. The negative regression coefficients found between herbaceous species ground cover or between herbaceous species diversity and Prosopis canopy dummy, clarifies the partial direct negative effect of Prosopis on herbaceous species. We corroborate this finding by greenhouse studies that show stronger inhibition A. tortilis and Prosopis seed germination by increasing the concentration of fresh Prosopis litter than by increasing the concentration A. tortilis litter in the soil. Indeed, our study demonstrates potential of seed germination termination at 50% fresh Prosopis litter concentration in the soil. After one month of watering of soil-litter mixture, we found no litter effect on seed germination. Since water leaching decreased the concentration of soluble phenols and leached litter had no effect on seed germination, our study has clarified that the inhibition of A. tortilis regeneration by Prosopis canopy was partially the result of allelopathic effect of Prosopis litter on A. tortilis seed germination.
    There has been great confusion on Prosopis species identity in Prosopis invaded areas of Kenya, because of similar morphology and introduction of several species within sites. Species misidentification may hamper invasion management. In this study we used Random Amplified DNA markers to differentiate species according to sites. Our study shows that only one species or a hybrid is adapted to any one site, despite the number of species that were introduced to any site. We have further clarified that P. juliflora and its hybrid are the most invasive germplasm in Kenya. However, P. juliflora and the hybrid trees tended to have similar tree characteristics in riverine forests and wetlands as we could predict tree volumes in wetlands from equations developed from a distant riverine site.
    Our study demonstrates potential for perpetual replacement of A. tortilis by Prosopis species in riverine ecosystems. A notable consequence is reduction of both herbaceous species productivity and diversity. Since both A. tortilis and herbaceous species are used for fodder; invasion may have severe consequences on the pastoral economy but this can be reversed by intensified utilization of Prosopis biomass for fuelwood and pods for fodder.

    Achter ‘hooikoortsplant’schuilt gezondheidsgevaar; doortesten op specifiek IgE tegen ambrosia blijkt noodzakelijk
    Vliet, A.J.H. van - \ 2010
    News Reporter / Siemens Diagnostics 6 (2010). - p. 14 - 15.
    ambrosia - onkruiden - invasie - geïntroduceerde soorten - allergieën - volksgezondheid - gevoeligheid - hooikoorts - groeiplaatsen - klimaatverandering - ambrosia - weeds - invasion - introduced species - allergies - public health - sensitivity - pollen allergy - sites - climatic change
    Is sensibilisatie voor ambrosiapollen een kruisreactie met de inheemse bijvoet, of zorgt de opkomst van de exoot wel degelijk voor een verlenging van het hooikoortsseizoen? Klinisch chemicus Cees Beijer van het Rijnland Ziekenhuis in Leiderdorp en het Diaconessenhuis in Leiden onderzocht de kruisreactiviteit van de allergenen. Conclusie: sensibilisatie voor specifieke allergenen van ambrosia kan ook in Nederland een probleem worden.
    Alien and invasive woody species in the dunes of the Wadden Sea Island of Vlieland: a remote sensing approach
    Hantson, W. ; Kooistra, L. ; Slim, P.A. - \ 2010
    Wageningen : Alterra (Alterra-report 2101) - 54
    struiken - invasie - cartografie - remote sensing - classificatie - prunus serotina - rosa rugosa - natuurbescherming - nederland - nederlandse waddeneilanden - shrubs - invasion - mapping - remote sensing - classification - prunus serotina - rosa rugosa - nature conservation - netherlands - dutch wadden islands
    In this study we mapped (alien) invasive shrubs for management and conservation purposes. On the study site, the Wadden Sea Island of Vlieland, they are a serious treat for the quality of the grey dune habitat. We developed a remote sensing approach that delivers detailed and standardized maps of (alien) shrub cover. Three classification methods are used: maximum likelihood (ML) classification of aerial photographs, maximum likelihood classification aerial photographs combined with vegetation heights derived from LIDAR data (ML+), and object-based shrub classification.
    Effecten van de rode Amerikaanse rivierkreeft op de vegetatie en macrofauna van sloten
    Verdonschot, R.C.M. ; Schaik, H. van; Verdonschot, P.F.M. - \ 2009
    H2O : tijdschrift voor watervoorziening en afvalwaterbehandeling 42 (2009)20. - ISSN 0166-8439 - p. 36 - 39.
    sloten - rivierkreeft - zoetwaterecologie - invasie - hydrobiologie - geïntroduceerde soorten - vegetatie - waterplanten - aquatische ecologie - macrofauna - ditches - crayfish - freshwater ecology - invasion - hydrobiology - introduced species - vegetation - aquatic plants - aquatic ecology - macrofauna
    Exotische rivierkreeften breiden zich zeer sterk uit in Nederland. Wat voor effecten dit heeft op de inheemse waterplantenvegetaties en macrofauna is onbekend. In het kader van het project PLONS voerde Alterra daarom bij wijze van case-studie een experiment uit, waarin de invloed van de rode Amerikaanse rivierkreeft op slootecosystemen onderzocht is. In afgesloten cilinders zijn de veranderingen gevolgd die optraden in de biomassa van verschillende soorten waterplanten en de samenstelling van de macrofaunagemeenschap na introductie van de rivierkreeft. De invloed bleek variabel en soortspecifiek. Met name afstervende planten werden gegeten. Een aantal waterplanten raakte los door het omwoelen van de bodem. De macrofaunagemeenschap werd niet merkbaar beïnvloed. In het maag-darmstelsel van de kreeften werd met name organisch bodemmateriaal en plantenresten aangetroffen, wat een aanwijzing is dat de kreeften een rol spelen bij de afbraak van organisch materiaal. Exoten hoeven dus niet altijd een negatieve invloed te hebben op zoetwaterecosystemen.
    Toekomstschets Ambrosia
    Vliet, A.J.H. van; Mulder, S. ; Terhürne, R.L. ; Bron, W.A. - \ 2009
    Wageningen : Wageningen Universiteit, Leerstoelgroep Milieusysteemanalyse, De Natuurkalender - 39
    ambrosia - onkruiden - invasie - geïntroduceerde soorten - allergieën - plagenbestrijding - klimaatverandering - klimaatfactoren - nederland - groeiplaatsen - hooikoorts - verspreiding van planten - ambrosia - weeds - invasion - introduced species - allergies - pest control - climatic change - climatic factors - netherlands - sites - pollen allergy - plant dispersal
    De hooikoortsplant ambrosia breidt zich in Nederland uit. De pollenconcentratie is tot nu toe echter nog laag. Uit onderzoek van PPO blijkt dat 70% van het Nederlandse landoppervlak geschikt is voor vestiging van ambrosia en dat Nederland over 10 jaar bij vrijwel alle klimaatscenario’s in de risicozone terecht komt. Naar verwachting kan 10 tot 20% van de Nederlandse bevolking gezondheidsklachten ontwikkelen na blootstelling aan ambrosiapollen
    Over 10 jaar: risicozone hooikoortsplant ambrosia
    Vliet, A.J.H. van; Mulder, S. ; Terhürne, R.L. ; Bron, W.A. - \ 2009
    Nature Today 2009 (2009)13-9-2009.
    ambrosia - invasie - geïntroduceerde soorten - allergieën - plagenbestrijding - klimaatverandering - volksgezondheid - nederland - hooikoorts - ambrosia - invasion - introduced species - allergies - pest control - climatic change - public health - netherlands - pollen allergy
    De hooikoortsplant ambrosia staat in september in bloei. De plant breidt zich in Nederland uit. De pollenconcentratie is tot nu toe echter nog laag. Dit blijkt uit de door Wageningen Universiteit gepubliceerde ‘Toekomstschets ambrosia’. Hieruit blijkt verder dat 70% van het Nederlandse landoppervlak geschikt is voor vestiging van ambrosia en dat Nederland over 10 jaar bij vrijwel alle klimaatscenario’s in de risicozone terecht komt. Naar verwachting kan 10 tot 20% van de Nederlandse bevolking gezondheidsklachten ontwikkelen na blootstelling aan ambrosiapollen. In een filmpje is te zien dat planten die afgemaaid zijn snel weer uitlopen en in bloei kunnen komen
    Deskstudie biologische bestrijding van invasieve exotische oever- en wateronkruiden in Nederland
    Kempenaar, C. ; Franke, A.C. ; Lotz, L.A.P. - \ 2009
    Wageningen : Plant Research International (Nota / Plant Research International 589) - 24
    rivieroeverbeplantingen - schadelijke waterplanten - onkruidbestrijding - biologische bestrijding - geïntroduceerde soorten - invasie - nederland - aquatische ecosystemen - riverside plantations - aquatic weeds - weed control - biological control - introduced species - invasion - netherlands - aquatic ecosystems
    In dit rapport wordt een overzicht gegeven van biologische onkruidbestrijding in het algemeen, en ontwikkelingen op het gebied van biologische bestrijding van elf belangrijke exotische oever- en wateronkruiden in Nederland in het bijzonder. Twee relevante casussen worden nader belicht: de graskarper en de waterhyacint
    Economics of controlling invasive species: the case of Californian thistle in New Zealand
    Chalak, S.M. - \ 2009
    Wageningen University. Promotor(en): Ekko van Ierland, co-promotor(en): Arjan Ruijs. - [S.l. : S.n. - ISBN 9789085853213 - 140
    milieu - economie - invasie - onkruiden - biologische bestrijding - uitsterven - risico - herbivoren - dynamisch programmeren - verspreiding - concurrentie tussen planten - stuifmeelconcurrentie - nieuw-zeeland - cirsium arvense - milieueconomie - verspreiding van planten - environment - economics - invasion - weeds - biological control - extinction - risk - herbivores - dynamic programming - dispersal - plant competition - pollen competition - new zealand - cirsium arvense - environmental economics - plant dispersal
    Keywords
    Invasive species, Economics, Californian thistle, New Zealand, Stochastic, Dynamic programming, Biological control, Extinction risk, Herbivory, Dispersal, Competition
    Invasive species are one of the most significant threats to biodiversity and agricultural production systems leading to huge worldwide economic damages. This thesis has two main aims. The first aim is to analyse the control of an invasive plant in an agricultural system, using the case study of the Californian thistle in New Zealand. The second aim is to study the negative externalities that controlling invasion in agriculture can pose to ecosystems.
    To achieve the first aim, both deterministic and stochastic dynamic programming models are set up to find cost effective methods to tackle the problem of Californian thistle. I make a contribution to the literature by performing a dynamic and stochastic programming analysis in which two different categories of control strategies are considered, each with different dynamics. Models are set up with a discrete decision variable consisting of 62 feasible combinations of integrated control strategies. For the second aim I introduce a novel modelling approach in which two compartments are distinguished: a managed compartment where locally a herbivore is introduced to control a weed, and a natural compartment where the same herbivore species can attack a wild plant species. The main processes are herbivory, competition, dispersal and control.
    I conclude that bioeconomic modelling is an important tool in analysing optimal management strategies for the control of invasive species and that annual and once and for all choices need to be integrated in the analysis. A stochastic approach is appropriate but does not necessarily lead to different results, depending on the parameter values and the setup of the model. Finally, the method illustrates that an integrated analysis of the economic system and the ecological system is required to assess the risk of extinction of natural plant species. This risk depends on species interactions which in this thesis are competition, dispersal and herbivory. I conclude that a control measure can protect the desirable wild plant species and increase benefits obtained from the ecosystem.
    For the policy implications, I conclude that there are several strategies to control invasive species, which can be integrated combinations of control options. The optimal strategy depends on the costs and benefits of the control options. In the case study for the Californian thistle I found that the optimal strategy is a combination of methods. For the interaction between agricultural and natural system I conclude that introducing a biological agent to the agricultural system can cause extinction of a desirable plant in the natural system. The main processes are competition, herbivory and dispersal. These processes are important and need to be analysed in detail before introducing the biological agent. I conclude that the optimal strategy to control the introduced biological agent also depends on interaction of species through competition, dispersal and herbivory.

    Wasberen (Procyon lotor L. 1758) in Nederland : verspreiding, ecologie en mogelijke gevolgen voor Nederland
    Lammertsma, D.R. ; Groot Bruinderink, G.W.T.A. ; Broekhuizen, S. - \ 2008
    Wageningen : Alterra (Alterra-rapport 1741) - 25
    procyonidae - geïntroduceerde soorten - habitats - zoogdieren - invasie - inventarisaties - nederland - procyonidae - introduced species - habitats - mammals - invasion - inventories - netherlands
    Momenteel komt de Wasbeer incidenteel voor in België en Nederland. Veel media-aandacht krijgt hij, vanwege de (vermeende) aantaltoename en de grote impact op weidevogels en volksgezondheid. Wanneer de Wasbeer zich permanent vestigt in Nederland zijn, gezien de ervaringen in Duitsland waar lokaal hoge dichtheden worden bereikt, de effecten met betrekking tot veterinaire risico’s, economische schade en ecosysteemschade gering. Wasberen zouden in Nederland daarom hun huidige status in de Flora & Faunawet kunnen houden, waarbij ontheffing kan worden verleend ter voorkoming van schade en overlast
    Indicatoren voor 'Convention on biodiversity 2010'. Effecten van klimaatverandering op insectenplagen bij bomen
    Moraal, L.G. - \ 2007
    Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-werkdocument 53.7b) - 30
    biodiversiteit - klimaatverandering - klimaatfactoren - insectenplagen - bomen - invasie - effecten - nederland - invloeden - biodiversity - climatic change - climatic factors - insect pests - trees - invasion - effects - netherlands - influences
    De laatste decennia worden veel veranderingen bij plaaginsecten waargenomen. Zo treden er veranderingen op bij inheemse soorten: sommige eerst algemene plaagsoorten verdwijnen terwijl andere juist frequenter voorkomen. Daarnaast hebben we te maken met nieuwe soorten afkomstig uit Zuid-Europa en met uitheemse soorten (exoten) die bewust of onbewust zijn geïntroduceerd buiten het normale verspreidingsgebied en die bedreigend kunnen zijn voor biodiversiteit, volksgezondheid of economie. Het klimaat is een uiterst belangrijke factor bij de ontwikkeling van insecten. Veranderingen in het klimaatverandering zullen onherroepelijk veranderingen bij insectenpopulaties teweeg brengen. In dit rapport worden klimaat, en klimaatverandering in verband gebracht met sommige veranderingen van plagen zoals die worden waargenomen met het LNV project ‘Monitoring van insectenplagen op bomen en struiken sinds 1946'
    Invasion of Piper aduncum in the shifting cultivation systems of Papua New Guinea: Foreword by David Pimentel
    Hartemink, A.E. - \ 2006
    Wageningen : ISRIC - World Soil Information - ISBN 9789081062817 - 234
    piper aduncum - invasies - zwerflandbouw - ecologie - invasie - papoea-nieuw-guinea - piper aduncum - invasions - shifting cultivation - ecology - invasion - papua new guinea
    Piper aduncum, a shrub native to Central America, arrived in Papua New Guinea before the mid-1930s possibly from West Papua. From the 1970s it started to dominate the secondary fallow vegetation in many parts of the humid lowlands. It invaded grassland areas and it also appeared in the highlands up to 2100 m. The combination of its small and abundant seeds, its high growth rates, and the accidental or intentional spreading has resulted in its presence in most provinces of Papua New Guinea. The spread will continue.
    Biodiversity loss in grasslands : consequences for ecosystem functioning and interactions with above- and belowground organisms
    Ruijven, J. van - \ 2005
    Wageningen University. Promotor(en): Frank Berendse. - s.l. : S.n. - ISBN 9789085040873 - 174
    graslanden - ecosystemen - vegetatie - plantengemeenschappen - biodiversiteit - invasie - achteruitgang (decline) - groei - bodembiologie - parasieten - plantenparasitaire nematoden - agrobiodiversiteit - grasslands - ecosystems - vegetation - plant communities - biodiversity - invasion - decline - growth - soil biology - parasites - plant parasitic nematodes - agro-biodiversity
    Considering the current rate of extinctions, it is crucial to understand the consequences of these losses of biodiversity for the functioning of ecosystems. Grasslands proved a very suitable ecosystem for biodiversity-ecosystem functioning research.

    In earlier experiments, nitrogen-fixing legumes dominated the effects of plant diversity, but in our experiment without legumes we also found that diverse plant communities have higher productivity than species-poor ones. These results could not be explained by sampling effects. Instead, complementarity in nutrient uptake and more efficient nutrient use at high diversity are the most important driving forces behind the positive effects of diversity. We also found that the negative effect of plant diversity on the invasibility of the community may be a sampling effect, as the increased presence of two particular plant species were the most important factors affecting invasion success. 

    Plant diversity may also affect many other organisms in grasslands. We found that nematodes responded positively to plant diversity. Specific associations between plants and nematodes resulted in increased nematode diversity at high plant diversity.

    Of course, higher trophic level organisms do not only respond to plant diversity, they may also regulate plant diversity. We found that arbuscular mycorrhizal fungi (AMF) alter competition between plants and contribute to plant diversity by enhancing the establishment of plants.

    Earlier studies also reported strong effects of herbivores, pathogens and mutualists on plant communities, but most of these studies investigated a single group of organisms in isolation from other driving forces. We show that the separate effects of these organisms on plant diversity may change dramatically when studied in combination. A neutral effect of an aboveground insect herbivore on plant diversity and a positive effect of a belowground insect herbivore turned strongly negative when both herbivores were present in the plant community.

    It is argued that a combined approach, using interactions between changes in plant diversity and multiple 'drivers of plant diversity' (both biotic and abiotic) is needed to fully understand plant community dynamics. To be able to predict the consequences of biodiversity loss worldwide it is necessary to integrate the results of this approach over different ecosystems and ecosystem processes across large spatial and temporal scales.
    Marsilea quadrifolia L. (klaverbladvaren) nieuw voor Nederland
    Drok, W.J.A. ; Weeda, E.J. - \ 1999
    Gorteria 25 (1999)5. - ISSN 0017-2294 - p. 89 - 103.
    marsilea quadrifolia - planten - plantengemeenschappen - vegetatie - synecologie - plantenecologie - milieu - aquatische gemeenschappen - migratie - verspreiding - zaadverspreiding - invasie - plantengeografie - rivieren - bedreigde soorten - beschermde soorten - pioniersoorten - onderzoek - waal - zuid-holland - bommelerwaard - uiterwaarden - marsilea quadrifolia - plants - plant communities - vegetation - synecology - plant ecology - environment - aquatic communities - migration - dispersal - seed dispersal - invasion - phytogeography - rivers - endangered species - protected species - pioneer species - research - river waal - zuid-holland - bommelerwaard - river forelands
    In 1998 is deze watervaren, bekend als aquariumplant, aangetroffen in een uiterwaard van de Waal in de Bommelerwaard. Dit is 190 km noordelijker dan de tot dusver noordelijkste vindplaats. Verspreiding, achteruitgang, ecologie en plantensociologische aspecten van deze soort van Europese Rode Lijsten
    Nachtelijke vliegpatronen en vlieghoogtes van duikeenden in het IJsselmeergebied
    Dirksen, S. ; Spaans, A.L. ; Winden, J. van der; Bergh, L.M.J. van den - \ 1998
    Limosa 71 (1998)2. - ISSN 0024-3620 - p. 57 - 68.
    zwemmen - zoölogie - migratie - invasie - aythya - flevoland - swimming - zoology - migration - invasion - aythya - flevoland
    Wat is een exoot?
    Hengeveld, R. ; Brink, F.W.B. van den - \ 1998
    De Levende Natuur 99 (1998)1. - ISSN 0024-1520 - p. 2 - 5.
    migratie - invasie - migration - invasion
    Exoten bestrijding vanuit oecologisch begrip
    Hengeveld, R. - \ 1998
    De Levende Natuur 99 (1998)1. - ISSN 0024-1520 - p. 18 - 22.
    vogels - migratie - invasie - nederland - birds - migration - invasion - netherlands
    In de voetsporen van de eik, postglaciale herkolonisatie-routes
    Dam, B.C. van; Vries, S.M.G. de - \ 1998
    De Levende Natuur 99 (1998)1. - ISSN 0024-1520 - p. 38 - 41.
    bosbouw - bomen - invasie - planten - nederland - quercus - forestry - trees - invasion - plants - netherlands - quercus
    Effects of exotic amphipod invasions on fish diet in the Lower Rhine
    Kelleher, B. ; Bergers, P.J.M. ; Brink, F.W.B. van den; Giller, P.S. ; Velde, G. van der; Vaate, B. bij de - \ 1998
    Archiv für Hydrobiologie 143 (1998)3. - ISSN 0003-9136 - p. 363 - 382.
    amphipoda - invasie - voedselketens - vissen - zoetwaterecologie - geïntroduceerde soorten - aquatische ecosystemen - rijn - amphipoda - invasion - food chains - fishes - freshwater ecology - introduced species - aquatic ecosystems - river rhine
    To assess the importance and effect of recent exotic species invasions on components of food webs of common Lower Rhine biotopes (breakwaters and channel-connected sandpits), the diets of two important macrozoobenthivores, perch (Perca fluviatilis L.) and eel (Anguilla anguilla (L.)) were compared before and after invasions of exotic Amphipoda
    Verslag van de forumdiscussie. Themanummer Exoten: mogen ze blijven?
    Olsthoorn, A.F.M. - \ 1998
    Nederlands Bosbouwtijdschrift 70 (1998)4. - ISSN 0028-2057 - p. 194 - 197.
    migratie - invasie - bosbouw - bossen - economische impact - nederland - migration - invasion - forestry - forests - economic impact - netherlands
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