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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No evidence of flowering synchronization upon floral volatiles for a short lived annual plant species: Revisiting an appealing hypothesis
Fricke, Ute ; Lucas-Barbosa, Dani ; Douma, Jacob C. - \ 2019
BMC Ecology 19 (2019)1. - ISSN 1472-6785
Flowering onset - Flowering synchronization - Phenology - Plant-plant communication

Background: Self-incompatible plants require simultaneous flowering mates for crosspollination and reproduction. Though the presence of flowering conspecifics and pollination agents are important for reproductive success, so far no cues that signal the flowering state of potential mates have been identified. Here, we empirically tested the hypothesis that plant floral volatiles induce flowering synchrony among self-incompatible conspecifics by acceleration of flowering and flower opening rate of non-flowering conspecifics. We exposed Brassica rapa Maarssen, a self-incompatible, in rather dense patches growing annual, to (1) flowering or non-flowering conspecifics or to (2) floral volatiles of conspecifics by isolating plants in separate containers with a directional airflow. In the latter, odors emitted by non-flowering conspecifics were used as control. Results: Date of first bud, duration of first flower bud, date of first flower, maximum number of open flowers and flower opening rate were not affected by the presence of conspecific flowering neighbors nor by floral volatiles directly. Conclusions: This study presents a compelling approach to empirically test the role of flower synchronization by floral volatiles and challenges the premises that are underlying this hypothesis. We argue that the life history of the plant as well as its interaction with pollinators and insect herbivores, as well as the distance over which volatiles may serve as synchronization cue, set constraints on the fitness benefits of synchronized flowering which needs to be taken into account when testing the role of floral volatiles in synchronized flowering.

A Latex Metabolite Benefits Plant Fitness under Root Herbivore Attack
Huber, M. ; Epping, Janina ; Schulze Gronover, C. ; Fricke, Julia ; Aziz, Zohra ; Brillatz, Théo ; Swyers, Michael ; Kollner, T.G. ; Vogel, H. ; Hammerbacher, Almuth ; Triebwasser-Freese, Daniella ; Robert, Christelle A.M. ; Verhoeven, K.J.F. ; Preite, V. ; Gershenzon, J. ; Erb, M. - \ 2016
PloS Biology 14 (2016)1. - ISSN 1545-7885
Plants produce large amounts of secondary metabolites in their shoots and roots and store them in specialized secretory structures. Although secondary metabolites and their secretory structures are commonly assumed to have a defensive function, evidence that they benefit plant fitness under herbivore attack is scarce, especially below ground. Here, we tested whether latex secondary metabolites produced by the common dandelion (Taraxacum officinale agg.) decrease the performance of its major native insect root herbivore, the larvae of the common cockchafer (Melolontha melolontha), and benefit plant vegetative and reproductive fitness under M. melolontha attack. Across 17 T. officinale genotypes screened by gas and liquid chromatography, latex concentrations of the sesquiterpene lactone taraxinic acid β-D-glucopyranosyl ester (TA-G) were negatively associated with M. melolontha larval growth. Adding purified TA-G to artificial diet at ecologically relevant concentrations reduced larval feeding. Silencing the germacrene A synthase ToGAS1, an enzyme that was identified to catalyze the first committed step of TA-G biosynthesis, resulted in a 90% reduction of TA-G levels and a pronounced increase in M. melolontha feeding. Transgenic, TA-G-deficient lines were preferred by M. melolontha and suffered three times more root biomass reduction than control lines. In a common garden experiment involving over 2,000 T. officinale individuals belonging to 17 different genotypes, high TA-G concentrations were associated with the maintenance of high vegetative and reproductive fitness under M. melolontha attack. Taken together, our study demonstrates that a latex secondary metabolite benefits plants under herbivore attack, a result that provides a mechanistic framework for root herbivore driven natural selection and evolution of plant defenses below ground.
Evaluating the characteristics of a non-standardised Model Requirements Analysis (MRA) for the development of policy impact assessment tools
Sieber, S. ; Amjath-Babu, T.S. ; McIntosh, B.S. ; Tscherning, K. ; Mulller, K. ; Helming, K. ; Pohle, D. ; Fricke, K. ; Verweij, P.J.F.M. ; Pacini, C. ; Jansson, T. ; Paloma, S.G.Y. - \ 2013
Environmental Modelling & Software 49 (2013). - ISSN 1364-8152 - p. 53 - 63.
support - systems - design - methodology - management - decision - science
The aim of this paper is to provide a critical analysis of the strengths and weaknesses of a non-standardised Model Requirements Analysis (MRA) used for the purpose of developing the Sustainability Impact Assessment Tool (SIAT). By 'non-standardised' we mean not strictly following a published MRA method. The underlying question we are interested in addressing is how non-standardised methods, often employed in research driven projects, compare to defined methods with more standardised structure, with regards their ability to capture model requirements effectively, and with regards their overall usability. Through describing and critically assessing the specific features of the non-standardised MRA employed, the ambition of this paper is to provide insights useful for impact assessment tool (IAT) development. Specifically, the paper will (i) characterise kinds of user requirements relevant to the functionality and design of IATs; (ii) highlight the strengths and weaknesses of non-standardised MRA for user requirements capture, analysis and reflection in the context of IAT; (iii) critically reflect on the process and outcomes of having used a non-standardised MRA in comparison with other more standardised approaches. To accomplish these aims, we first review methods available for IAT development before describing the SIAT development process, including the MRA employed. Major strengths and weaknesses of the MRA method are then discussed in terms of user identification and characterisation, organisational characterisation and embedding, and ability to capture design options for ensuring usability and usefulness. A detailed assessment on the structural differences of MRA with two advanced approaches (Integrated DSS design and goal directed design) and their role in performance of the MRA tool is used to critique the approach employed. The results show that MRA is able to bring thematic integration, establish system performance and technical thresholds as well as detailing quality and transparency guidelines. Nevertheless the discussion points out to a number of deficiencies in application - (i) a need to more effectively characterise potential users, and; (ii) a need to better foster communication among the distinguished roles in the development process. If addressed these deficiencies, SIAT non-standardised MRA could have brought out better outcomes in terms of tool usability and usefulness, and improved embedding of the tool into conditions of targeted end-users. (C) 2013 Elsevier Ltd. All rights reserved.
Policy relevance of three integrated assessment tools - A comparison with specific reference to agricultural policies
Uthes, S. ; Fricke, K. ; Konig, H. ; Zander, P. ; Ittersum, M.K. van; Sieber, S. ; Helming, K. ; Piorr, A. ; Muller, K. - \ 2010
Ecological Modelling 221 (2010)18. - ISSN 0304-3800 - p. 2136 - 2152.
land-use change - european-union - farm models - impact - biodiversity - uncertainty - netherlands - scenarios - countries - framework
The Common Agricultural Policy (CAP), a system of market support instruments, direct income transfers, and rural development measures, has been put through an ongoing reform process in recent decades. This paper introduces three policy impact assessment tools (SIAT, SEAMLESS-IF, MEA-Scope tool) and analyses how these tools have responded to a number of challenges for integrated assessment modelling as reported in the international literature. Significant progress has been made with regard to modelling linkages whereas other challenges, particularly those related to issues of scale and uncertainty management, require further efforts. It is also analysed which CAP instruments are represented and what kinds of effects can be analysed at different scales. Market instruments and direct payments are comparatively well represented, while the ability to model rural development measures is mostly beyond the scope of these tools. Because each tool has found a different solution for coping with the common challenges of integrated assessment modelling, the choice of one of the tools for a particular application depends strongly on the policy questions being asked. The SIAT provides the big picture via its ability to represent broad changes in policy instruments with EU-wide cross-sector impacts. The most comprehensive analysis of agricultural policy instruments can be obtained with SEAMLESS-IF. The MEA-Scope tool complements the other two approaches with detailed regional profiles
Transfer into decision support: the sustainability impact assessment tool (SIAT)
Sieber, S. ; Müller, K. ; Verweij, P.J.F.M. ; Haraldsson, H. ; Fricke, K. ; Pacini, C. ; Tscherning, K. ; Helming, K. ; Jansson, T.G. - \ 2008
In: Sustainability impact assessment of land use changes / Helming, K., Pérez-Soba, M., Tabbush, P., Berlin : Springer - ISBN 9783540786474 - p. 107 - 128.
This paper focuses on the development process and performance of the integrated meta-model Sustainability Impact Assessment Tool (SIAT), whose appropriateness for Sustainability Impact Assessment is finally discussed. The integrated meta-modelling approach SIAT is the central product of the project SENSOR, which innovates a simultaneous ex-ante policy impact assessment by 45 indicators with a full coverage of EU27. The knowledge-based model SIAT enables end users to assess the effects of land-use relevant EU-policy strategies and evaluate the impacts against sustainability criteria. The concept of the development process is crucial for the success of SIAT, since problem- and user-orientation can only be ensured by meeting precisely user’s requirements. The adequate external involvements of institutions in the design process as well as project-internal knowledge integration are essential keys for success. Latter focuses on quantitative assessments, qualitative knowledge and ensuring a consistent multi-scale interconnectivity. The novelty of the meta-model approach SIAT consists of the dual approach that a) analyses by ‘impact identification’ the effects of changes on multifunctional land use and subsequent b) assesses their fulfilment of sustainable tolerance limits through ‘sustainability (risk) valuation’. The model framework focuses on cross-sectoral trade offs and side effects of the six sectors agriculture, forestry, energy, transport, nature conversation and tourism. The regionalisation of results is rendered in administrative European regions (NUTS2/3). The discussion concludes that the integrated meta-model SIAT is a feasible model concept to conduct sustainability impact assessments.
Sustainability Impact Assessment Tools (SIAT) for European Analysis
Sieber, S. ; Verweij, P.J.F.M. ; Wien, J.J.F. ; Pohle, D. ; Fricke, K. ; Müller, K. ; Pacini, C. ; Haraldsson, H. - \ 2008
In: Impact Assessment of Land Use Changes: International Conference, Book of abstracts, Berlin, Germany, April 6-9, 2008. - Berlin (Germany) : Humboldt University Unter den Linden - p. 15 - 15.
Sustainability Impact Assessment Tools (SIAT) for Regionalised European Impact Analysis: Focusing on the design process
Sieber, S. ; Verweij, P.J.F.M. ; Wien, J.J.F. ; Pohle, D. ; Fricke, K. ; Müller, K. ; Pacini, C. ; Haraldson, H. ; Tscherning, K. ; Helming, K. - \ 2008
In: Proceedings of the iEMSs Fourth Biennial Meeting: International Congress on Environmental Modelling and Software iEMSs 2008, Barcelona, Spain, July 7-10, 2008. - Barcelona (Spain) : Universitat Politècnica de Catalunya - p. 1008 - 1016.
A simple model for predicting transpiration of greenhouse cucumber
Kage, H. ; Krämer, M. ; Körner, O. ; Fricke, A. - \ 2000
Gartenbauwissenschaft 65 (2000)3. - ISSN 0016-478X - p. 107 - 114.
Red List of Lampreys and Marine Fishes of the Wadden Sea
Berg, S. ; Krog, C. ; Muus, B. ; Nielsen, J. ; Fricke, R. ; Berghahn, R. ; Neudecker, T. ; Wolff, W.J. - \ 1996
Helgoländer Meeresuntersuchungen 50 (1996)SUPPL.. - ISSN 0174-3597 - p. 101 - 105.
Densification Behaviour Aerogels upon Isothermal Sintering
Emmerling, A. ; Lenhard, W. ; Fricke, J. ; Vorst, G.A.L. van de - \ 1995
In: Proceedings 8th International Workshop on Glasses and Ceramics from Gels - p. 30 - 36.
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