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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Patterns of exotic plant species in the Netherlands: a macroecological perspective
Speek, T.A.A. - \ 2015
Wageningen University. Promotor(en): Wim van der Putten, co-promotor(en): Bert Lotz. - Wageningen : Wageningen University - ISBN 9789462572898 - 158
geïntroduceerde soorten - vegetatie - plantengeografie - invasieve soorten - plantengemeenschappen - dominantie - nederland - introduced species - vegetation - phytogeography - invasive species - plant communities - dominance - netherlands
In dit proefschrift heb is onderzocht wat mogelijkheden zijn om het invasief potentieel van geïntroduceerde plantensoorten en de invasibiliteit van plantengemeenschappen in Nederland te voorspellen. Soorten zijn gebruikt die hier al geïntroduceerd zijn, omdat van deze hun invasief succes bekend is. Om hun invasiviteit te kwantificeren is informatie gebruikt over de regionale en lokale verspreiding. De unieke beschikbaarheid van deze datasets voor plantensoorten in Nederland bieden nieuwe kansen, die mogelijk helpen de voorspelbaarheid van invasiviteit te verhogen, uit te leggen hoe invasiviteit van een soort kan veranderen in de tijd en hoe de samenstelling van de plantengemeenschap kan bepalen welke geïntroduceerde soorten zich kunnen vestigen.
Local dominance of exotic plants declines with residence time: a role for plant soil feedback?
Speek, T.A.A. ; Schaminée, J.H.J. ; Stam, J.M. ; Lotz, L.A.P. ; Ozinga, W.A. ; Putten, W.H. van der - \ 2015
AoB Plants 7 (2015). - ISSN 2041-2851 - 24 p.
Recent studies have shown that introduced exotic plant species may escape from their native soil-borne pathogens, but that they become exposed to increased soil pathogen activity in the new range when time since introduction increases. Other studies have shown that introduced exotic plant species become less dominant when time since introduction increases, and that plant abundance may be controlled by soil-borne pathogens, however, no study yet has tested if these soil effects might explain the decline in dominance of exotic plant species following their initial invasiveness. Here we determine plant-soil feedback of 20 plant species that have been introduced into The Netherlands. We tested the hypotheses that (1) exotic plant species with a longer residence time have a more negative soil feedback, and (2) greater local dominance of the introduced exotic plant species correlates with less negative, or more positive plant-soil feedback. Although the local dominance of exotic plant species decreased with time since introduction, there was no relationship of local dominance with plant-soil feedback. Plant-soil feedback also did not become more negative with increasing time since introduction. We discuss why our results may deviate from some earlier published studies and why plant-soil feedback may not in all cases, or not in all comparisons explain patterns of local dominance of introduced exotic plant species.
Testing the Australian Weed Risk Assessment with different estimates for invasiveness
Speek, T.A.A. ; Davies, J.A.R. ; Lotz, L.A.P. ; Putten, W.H. van der - \ 2013
Biological Invasions 15 (2013)6. - ISSN 1387-3547 - p. 1319 - 1330.
assessment system - plant invasiveness - success - invasion - europe - flora - history - tool
The Weed Risk Assessment (WRA) has become an effective tool in predicting invasiveness of exotic plant species. In studies testing the WRA, exotic plant species are usually divided into major weeds, minor weeds and non-weeds. However, these divisions are qualitative, as the categories are assigned by experts. Many studies searching for plant traits that are indicative of plant invasiveness use quantitative estimates to measure invasiveness. We compared how quantitative and qualitative estimates of invasiveness may relate to WRA scores. As quantitative estimates we used regional frequency (spread), change in regional frequency and local dominance of naturalized exotic plant species in The Netherlands. To obtain a qualitative estimate we determined if the exotic plant species occurred on a black list in neighbouring regions. We related WRA scores of the exotic plant species to these qualitative and quantitative estimates of invasiveness. Our results reveal that the WRA predicted the qualitative (black list) estimate more accurately than the quantitative (dominance and spread) ones. The black list estimate matches with the overall impact of exotic species, which is assumed to incorporate regional spread, local dominance and noxiousness. Therefore, the WRA predicts the noxiousness component, but to a lesser extent the spatial components of impact of exotic species. On the other hand, studies that use regional spread and other quantitative estimates of invasiveness tend not to include the noxiousness component of impact. We propose that our analyses may also help to further solve the recent debate on whether or not performing research on exotic species.
Patterns of exotic plant species in the Netherlands: a macroecological approach
Speek, Tanja - \ 2011
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.
Factors relating to regional and local success of exotic plant species in their new range
Speek, T.A.A. ; Lotz, L.A.P. ; Ozinga, W.A. ; Tamis, W.L.M. ; Schaminée, J.H.J. ; Putten, W.H. van der - \ 2011
Diversity and Distributions 17 (2011)3. - ISSN 1366-9516 - p. 542 - 551.
propagule pressure - invasion success - soil feedbacks - native range - abundance - naturalization - vegetation - occupancy - europe - flora
Aim - To estimate invasiveness of exotic plant species, many studies have used the frequency of occurrence within a defined region. This measure is informative on how widespread exotics are, however, it does not inform on their local dominance, which is crucial for conservation of biodiversity and ecosystem functioning. The aim of the present study is to determine if regional frequency of occurrence of exotic plant species indeed is indicative of their local dominance. We also determined which plant traits and other factors predict regional and local frequencies best. Location - The Netherlands. Methods - We used information on exotic plant species established in The Netherlands and compared traits relating to their frequency of occurrence regionally (the entire country) and their frequency of dominance locally (in 1–100 m2 quadrats). We created minimal adequate models with factors explaining regional frequency and frequency of local dominance of 111 exotic plant species in The Netherlands. Results - The model that used plant traits to explain regional frequency of exotic plant species differed from the models that best explained their frequency of local dominance. Regionally, the factors that correlated with frequency were: life form, height, polyploidy, length of flowering season, residence time, human use and origin. The factors that correlated to frequency of local dominance were lateral vegetative spread and residence time. Main conclusions - We conclude that plant traits relating to the regional frequency of exotic plant species differ from those that relate to their frequency of local dominance. The implication of our results is that predictive studies on plant invasiveness based on regional frequencies may not be indicative of the local impacts. Since the prediction of local impacts is crucial for conservation and risk assessment, our study emphasized the need for better information on the local abundance of exotic invaders
Plant traits relating to success of exotic plant species on a regional versus a local scale
Speek, T.A.A. ; Lotz, L.A.P. ; Ozinga, W.A. ; Tamis, W.L.M. ; Schaminee, J.H.J. ; Putten, W.H. van der - \ 2010
Plant traits relating to success of exotic plant species on a regional versus a local scale
Speek, T.A.A. ; Lotz, L.A.P. ; Ozinga, W.A. ; Tamis, W.L.M. ; Schaminee, J.H.J. ; Putten, W.H. van der - \ 2010
Workshop on biological invasions – Towards general rules across taxa
Speek, Tanja - \ 2010
Plant traits relating to success of exotic plant species on a regional versus a local scale
Speek, T.A.A. ; Lotz, L.A.P. ; Ozinga, W.A. ; Tamis, W.L.M. ; Schaminee, J.H.J. ; Putten, W.H. van der - \ 2010
Predicting invasive success of alien plants on a regional and a local scale
Lotz, L.A.P. ; Speek, T.A.A. ; Putten, W.H. van der - \ 2009
In: Abstracts of the International Congress on Biological Invasions (ICBI 2009), Fuzhou, China, November 2-6, 2009. - Fuzhou, China : - p. 11 - 11.
Predicting invasive behaviour of exotic plants
Speek, T.A.A. ; Lotz, L.A.P. ; Putten, W.H. van der - \ 2009
In: Netherlands Annual Ecology Meeting, Lunteren, The Netherlands, February 10-11, 2009. - Lunteren : - p. 37 - 37.
Succes of alien plant species on a local versus a regional scale relates to different plant traits
Speek, T.A.A. ; Lotz, L.A.P. ; Putten, W.H. van der - \ 2009
In: From global change to molecular ecology, 39th Annual Conference GFOE (GfÖ) 2009 Dimensions of ecology Bayreuth, Germany, September 14-18, 2009. - Bayreuth : University of Bayreuth - p. 190 - 190.
Predicting which aliens will become invasive remains a challenge. Many studies have investigated whether the invaders have certain traits that make them better equipped in their introduced area compared to non-invaders. However, in tackling this question little research focussed on aspects of scale. The most invasive species are expected to perform well on a regional and a local scale. Many analyses have been performed on only one scale, often a regional scale. By looking at only one scale you might miss out on correlates that predict success only on the other scale. We combined data on alien plant performance in the Netherlands on the national scale and on the local scale. Analyses show that patterns of correlates vary for each scale. Different traits predict success on different scales
Predicting invasive behaviour of exotic plants
Speek, T.A.A. ; Lotz, L.A.P. ; Putten, W.H. van der - \ 2009
Trait groups of alien plants and their abundance in the Netherlands
Speek, T.A.A. ; Lotz, L.A.P. ; Putten, W.H. van der - \ 2008
In: NEOBIOTA: Towards a Synthesis, 5th European Conference on Biological Invasions, Prague (Czech Republic), 23.-26. September 2008. - Prague : Institute of Botany, Academy of Sciences of the Czech Republic - ISBN 9788086188294 - p. 173 - 173.
Invasive plant species can have major effects on the biodiversity and ecosystem functioning. Preventing their introduction would be the most cost-efficient solution. The majority of alien plants are introduced intentionally, for example by ornamental plant trade. If we knew which of these plants are likely to become noxious invaders, their introduction can be easily prohibited. Many studies addressed plant traits that predict invasiveness. Finding one trait or a group of traits that predict invasiveness among all plant species is unrealistic. But, at the level of genera or ecosystems, success has been achieved. Therefore, when examining the patterns among invasive plant species in the Netherlands we followed a multi-trait-group approach, linked to the species habitats. We aim to identify groups with a high and a low invasion potential. An advantage of doing this study in the Netherlands is the availability of extensive information on plant presences and abundances at the national and local scales. Defining which species are invasive and which are not is a difficult aspect of invasion ecology, many different definitions have been used. The Dutch databases are very helpful in this. Instead of using expert judgement for defining invasive and non-invasive alien species, we use local and national plant abundances to indicate the impact on the communities
Risico-analyse en risicomanagement van exoten
Speek, Tanja - \ 2008
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