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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Aandacht nodig voor effect mossen op grondwaterbalans
Voortman, B.R. ; Bartholomeus, Ruud ; Zee, S.E.A.T.M. van der; Witte, J.M. - \ 2018
Land + Water (2018)11. - ISSN 0926-8456
Plasma citrulline concentration, a marker for intestinal functionality, reflects exercise intensity in healthy young men
Kartaram, Shirley ; Mensink, Marco ; Teunis, Marc ; Schoen, Eric ; Witte, Gerrit ; Janssen Duijghuijsen, Lonneke ; Verschuren, Martie ; Mohrmann, Karin ; M'Rabet, Laura ; Knipping, Karen ; Wittink, Harriet ; Helvoort, Ardy van; Garssen, Johan ; Witkamp, Renger ; Pieters, Raymond ; Norren, Klaske van - \ 2018
Clinical Nutrition (2018). - ISSN 0261-5614 - 8 p.
Citrulline - Exercise intensity - Glutamine - Intestinal fatty acid binding protein - Intestinal function

Background & aims: Plasma citrulline concentration is considered to be a marker for enterocyte metabolic mass and to reflect its reduction as may occur during intestinal dysfunction. Strenuous exercise can act as a stressor to induce small intestinal injury. Our previous studies suggest that this comprises the intestinal ability to produce citrulline from a glutamine-rich protein bolus. In this study we investigated the effects of different exercise intensities and hydration state on citrulline and iFABP levels following a post-exercise glutamine bolus in healthy young men. Methods: Fifteen healthy young men (20–35 yrs, VO2 max 56.9 ± 3.9 ml kg−1 min−1) performed in a randomly assigned cross-over design, a rest (protocol 1) and four cycle ergometer protocols. The volunteers cycled submaximal at different percentages of their individual pre-assessed maximum workload (Wmax): 70% Wmax in hydrated (protocol 2) and dehydrated state (protocol 3), 50% Wmax (protocol 4) and intermittent 85/55% Wmax in blocks of 2 min (protocol 5). Immediately after 1 h exercise or rest, subjects were given a glutamine bolus with added alanine as an iso-caloric internal standard (7.5 g of each amino acid). Blood samples were collected before, during and after rest or exercise, up to 24 h post onset of the experiment. Amino acids and urea were analysed as metabolic markers, creatine phosphokinase and iFABP as markers of muscle and intestinal damage, respectively. Data were analysed using a multilevel mixed linear statistical model. p values were corrected for multiple testing. Results: Citrulline levels already increased before glutamine supplementation during normal hydrated exercise, while this was not observed in the dehydrated and rest protocols. The low intensity exercise protocol (50% Wmax) showed the highest increase in citrulline levels both during exercise (43.83 μmol/L ± 2.63 (p < 0.001)) and after glutamine consumption (50.54 μmol/L ± 2.62) compared to the rest protocol (28.97 μmol/L ± 1.503 and 41.65 μmol/L ± 1.96, respectively, p < 0.05). However, following strenuous exercise at 70% Wmax in the dehydrated state, citrulline levels did not increase during exercise and less after the glutamine consumption when compared to the resting condition and hydrated protocols. In line with this, serum iFABP levels were the highest with the strenuous dehydrated protocol (1443.72 μmol/L ± 249.9, p < 0.001), followed by the high intensity exercise at 70% Wmax in the hydrated condition. Conclusions: Exercise induces an increase in plasma citrulline, irrespective of a glutamine bolus. The extent to which this occurs is dependent on exercise intensity and the hydration state of the subjects. The same holds true for both the post-exercise increase in citrulline levels following glutamine supplementation and serum iFABP levels. These data indicate that citrulline release during exercise and after an oral glutamine bolus might be dependent on the intestinal health state and therefore on intestinal functionality. Glutamine is known to play a major role in intestinal physiology and the maintenance of gut health and barrier function. Together, this suggests that in clinical practice, a glutamine bolus to increase citrulline levels after exercise might be preferable compared to supplementing citrulline itself. To our knowledge this is the first time that exercise workload-related effects on plasma citrulline are reported in relation to intestinal damage.

Evaporation from dry dune vegetation
Voortman, Bernard Ruben - \ 2018
Vrije Universiteit. Promotor(en): J.P.M. Witte; Sjoerd van der Zee, co-promotor(en): Ruud Bartholomeus. - Amsterdam : Vrije Universiteit - ISBN 9789463611299 - 136
Entangled in scales : Multilevel governance challenges for regional planning strategies
Straalen, F.M. van; Witte, P.A. - \ 2018
Regional Studies, Regional Science 5 (2018)1. - ISSN 2168-1376 - p. 157 - 163.
Fuzzy governance - Regionalisation - Scalar problems - The Netherlands

The academic discourse considers the regional scale as an important planning level to provide for spatial objectives that transcend the boundaries of local authorities. Nonetheless, the problem-solving capacity of the regional planning level is still questioned by both academics and practitioners. This paper studies the tension between formal and informal regional governance and its practical challenges for two cases of Dutch provinces struggling with their position in regional governance networks. These cases entail pan-European development (Trans-European Transport Networks – TEN-T) and regional land development (Bloemendalerpolder). It was found that at the metropolitan scale, formal regional planning powers tend to overrule socially produced regional governance arrangements. Simultaneously, regional planning powers lack support of these socially produced arrangements for their interventions. At the same time, at the supra-regional scale, provinces are a logical stakeholder to fulfil a prominent role in regional governance, but often lack the institutional capacity to act as such. We therefore argue that regional planning authorities need to be granted the power and capacity to take up a more centripetal, intermediate role in governance arrangements. This would provide them more capacity to act in disentangling the difficult practical challenges of scalar problems that many regional governance arrangements currently face.

De waterwijzer natuur : instrumentarium voor kwantificeren van effecten van waterbeheer en klimaat op terrestrische natuur
Witte, J.P.M. ; Runhaar, J. ; Bartholomeus, R.P. ; Fujita, Y. ; Hoefsloot, P. ; Kros, J. ; Mol, J. ; Vries, W. de - \ 2018
Amersfoort : Stowa (Stowa rapport 2018-44) - ISBN 9789057738098 - 176
Behoud van levende populaties
Schurink, Anouk - \ 2018
Waarom de wetenschap amper hoop biedt voor de Noordelijke Witte Neushoorn
Windig, Jack - \ 2018
Verandering landgebruik voor bodemkwaliteit ook winstgevend voor intensieve bedrijven­
Eekeren, N. van; Wit, J. de; Evers, A. ; Haan, M. de - \ 2018
V-focus 15 (2018)3. - ISSN 1574-1575 - p. 32 - 34.
Voor een verbetering van organische stof en bodemkwaliteit op minerale gronden is het streven naar een landgebruik van 60% blijvend grasland met 20% gras, rode en witte klaver in vruchtwisseling met mais een belangrijke stap. In V-focus december 2016 is uitgerekend dat dit voor een bedrijf met 18.000 kg melk per ha een plus oplevert van 7.000 euro op jaarbasis. De vraagt dient zich aan hoe dit uitpakt bij een hogere intensiteit. Vanuit de Carbon Valley-projecten is dit berekend.
Effects of steaming on contaminants of emerging concern levels in seafood
Barbosa, Vera ; Maulvault, Ana Luísa ; Alves, Ricardo N. ; Kwadijk, Christian ; Kotterman, Michiel ; Tediosi, Alice ; Fernández-Tejedor, Margarita ; Sloth, Jens J. ; Granby, Kit ; Rasmussen, Rie R. ; Robbens, Johan ; Witte, Bavo De; Trabalón, Laura ; Fernandes, José O. ; Cunha, Sara C. ; Marques, António - \ 2018
Food and Chemical Toxicology 118 (2018). - ISSN 0278-6915 - p. 490 - 504.
Musk fragrances and UV-Filters - PAHs - PFCs - Seafood - Steaming - Toxic elements
Seafood consumption is a major route for human exposure to environmental contaminants of emerging concern (CeCs). However, toxicological information about the presence of CeCs in seafood is still insufficient, especially considering the effect of cooking procedures on contaminant levels. This study is one among a few who evaluated the effect of steaming on the levels of different CeCs (toxic elements, PFCs, PAHs, musk fragrances and UV-filters) in commercially relevant seafood in Europe, and estimate the potential risks associated with its consumption for consumers. In most cases, an increase in contaminant levels was observed after steaming, though varying according to contaminant and seafood species (e.g. iAs, perfluorobutanoate, dibenzo(ah)anthracene in Mytilus edulis, HHCB-Lactone in Solea sp., 2-Ethylhexyl salicylate in Lophius piscatorius). Furthermore, the increase in some CeCs, like Pb, MeHg, iAs, Cd and carcinogenic PAHs, in seafood after steaming reveals that adverse health effects can never be excluded, regardless contaminants concentration. However, the risk of adverse effects can vary. The drastic changes induced by steaming suggest that the effect of cooking should be integrated in food risk assessment, as well as accounted in CeCs regulations and recommendations issued by food safety authorities, in order to avoid over/underestimation of risks for consumer health.
Waterwijzers Landbouw en Natuur : kwantificering effecten waterbeheer en klimaat
Bartholomeus, R. ; Hack- ten Broeke, M. ; Heinen, M. ; Mulder, H.M. ; Kros, J. ; Ruijtenberg, R.E. ; Runhaar, H. ; Witte, J.P.M. - \ 2018
Landschap : tijdschrift voor Landschapsecologie en Milieukunde 2018 (2018)1. - ISSN 0169-6300 - p. 14 - 23.
Landbouw en natuur stellen specifieke eisen aan de waterhuishouding, vooral aan beschikbaar water in de wortelzone. Bestaande beoordelingssystemen houden echter geen rekening met de gevolgen van klimaatverandering voor respectievelijk landbouwopbrengsten en natuurdoelen. Daarom zijn er nu twee systemen in ontwikkeling die dat, zo goed mogelijk, wel doen: de Waterwijzer Landbouw en de Waterwijzer Natuur. Beide kunnen worden gebruikt voor het vaststellen van schade aan landbouw en natuur, maar ook voor het optimaliseren van de waterhuishouding.
Travelling without a helmet : Tourists' vulnerabilities and responses to disasters in Indonesia
Rindrasih, Erda ; Hartmann, Thomas ; Witte, Patrick ; Spit, Tejo ; Zoomers, Annelies - \ 2018
Disasters 42 (2018)4. - ISSN 0361-3666 - p. 782 - 803.
Behaviour - Cultural theory - Disaster management - Disasters - Indonesia - Responses - Tourists
Tourists are particularly vulnerable when natural disasters occur in regions that they are visiting. It is assumed that they lack awareness and understanding of the actions that they need to take in such circumstances. This study examines the responses of tourists in times of disaster, building on empirical data collected through large-scale surveys conducted in Bali and Yogyakarta, Indonesia, in 2015. Both are important tourist destinations in the country that have suffered major disasters in recent years. The different types of responses to these events are framed using a grid/group analysis stemming from cultural theory. The study resulted in three key findings: (i) current disaster management planning largely follows a single rationale; (ii) tourists are not a homogeneous group, but rather a complex, diverse, and dynamic body of stakeholders; and (iii) the focus of disaster management planning should shift from a single rationale to a polyrational methodology. Disaster managers need to consider, therefore, these different aspects in the context of preparedness.
'Van melk krijg je geen witte tanden' : Nulmeting van de consumptie van melk, groente en fruit, de kennis van gezonde eetgewoonten en het eet- en drinkgedrag van kinderen in Nederland
Bogaardt, M.J. ; Haaster-de Winter, M.A. van; Tacken, G.M.I. - \ 2018
Wageningen : Wageningen Economic Research (Wageningen Economic Research rapport 2018-021) - ISBN 9789463432467 - 27
Recently, in Europe the school fruit scheme and the school milk scheme have been merged into one school scheme. The purpose of the combined school arrangement is to promote the consumption of vegetables, fruit and milk by children. For the purpose of a long-term effect measurement of the regulation, this research covers the current level of consumption of dairy products, fruit and vegetables, the knowledge about healthy eating and the healthy eating and drinking behaviour of school-age children in the Netherlands who have not previously participated in the two schemes.
Projected vegetation changes are amplified by the combination of climate change, socio-economic changes and hydrological climate adaptation measures
Knaap, Yasmijn A.M. van der; Bakker, Martha M. ; Alam, Shah Jamal ; Witte, Jan Philip M. ; Aerts, Rien ; Ek, Remco van; Bodegom, Peter M. van - \ 2018
Land Use Policy 72 (2018). - ISSN 0264-8377 - p. 547 - 562.
Coupled modelling - Ecology - Hydrology - Interdisciplinary approach - Plant traits - Set-aside
Climate change is projected to strongly affect the hydrological cycle, altering water availability and causing successive shifts in vegetation composition and distribution. To reduce potential negative effects on vegetation, policymakers may implement hydrological climate adaptation measures, which may -in turn- require land use changes to be successful. Policy driven land use changes should therefore be taken into account when evaluating climate change and adaptation effects on the water-vegetation system, but this is rarely done. To support such policy interventions, we applied a coupled land use – hydrology – vegetation model to simulate effects of (i) climate change, (ii) socio-economic change, (iii) hydrological measures and (iv) policy driven land use change, alone and in interaction, on vegetation communities in the Netherlands. We simulated two climate scenarios for 2050 that differed in predicted temperature (+0.9 °C and +2.8 °C) and precipitation changes (groundwater recharge +4% or −14%). The associated socio-economic scenarios differed in the increase of gross margins per agricultural class. The land use changes concerned agricultural changes and development of new nature areas from agricultural land. Individually, land use changes had the biggest effect on vegetation distribution and composition, followed by the hydrological measures and climate change itself. Our results also indicate that the combination of all four factors triggered the biggest response in the extent of newly created nature areas (+6.5%) and the highest diversity in vegetation types, compared to other combinations (max. +5.4%) and separate factors. This study shows that an interdisciplinary, coupled modelling approach is essential when evaluating climate adaptation measures.
Polderen met de PAS in Twente : Verslag van de najaarsbijeenkomst van de NHV, 29 september 2016: 'Natura2000 en ecohydrologie, een praktijkvoorbeeld in Twente!'
Witte, F. ; Louw, P. de - \ 2017
Stromingen : vakblad voor hydrologen 27 (2017)1. - ISSN 1382-6069 - p. 61 - 65.
Ongeveer 35 mensen namen op 29 september 2016 de moeite om naar hotel-restaurant Tante Sien in Vasse (gemeente Tubbergen) af te reizen, om daar een bijeenkomst van de NHV bij te wonen. Een bont gezelschap van hydrologen, biologen, beleidsmakers, een meteoroloog, een tuinder en een verdwaalde fietsenmaker. Aanleiding was het 'fieldlab' dat hydroloog Jan van Bakel (Bakelse stroom), samen met landbouwdeskundige Inge Hageman (LTO Noord) en ecoloog Fons Eysink (Bosgroepen), uitvoerden naar maatregelen om de natuur te redden in het prachtige Springendal en het dal van de Mosbeek. In dit fieldlab heeft het drietal met de boer van ieder perceel gesproken om te bepalen wat er moet gebeuren in het kader van de Programmatische Aanpak Stikstof (PAS). Maatwerk in de praktijk, daar komt het fieldlab op neer.
Bestrijd voedselfraude: Denk als een crimineel!
Wagenberg, Coen van; Benninga, Jan ; Ruth, Saskia van - \ 2017
Ringpark Utrecht : een ruimtelijk concept van de eenentwintigste eeuw voor 'healthy urban living'
Roncken, P.A. ; Nefs, Merten ; Witte, Ymkje van de - \ 2017
Ruimte+Wonen 1 (2017)03. - p. 30 - 41.
park, regional design, governance, healthy urban living
Effect verandering landgebruik op emissies broeikasgassen
Vellinga, T. ; Eekeren, N. van - \ 2017
V-focus 14 (2017)2. - ISSN 1574-1575 - p. 38 - 39.
landgebruik - bodemkwaliteit - broeikasgassen - emissie - melkveehouderij - graslanden - wisselbouw - grasklaver - land use - soil quality - greenhouse gases - emission - dairy farming - grasslands - ley farming - grass-clover swards
In het vorige nummer van V-focus is besproken wat het optimale landgebruik voor bodemkwaliteit is op melkveebedrijven met gras en mais, namelijk: 60% blijvend grasland met een lage frequentie van graslandvernieuwing en 20% grasklaver (rode en witte klaver) in rotatie met 20% bouwland. In het hetzelfde nummerwerd uitgerekend dat dit een gemiddeld melkveebedrijf 7.000 euro per jaar oplevert. In het Project Vruchtbare Kringloop Achterhoek en Liemers (VKA) is gekeken wat dit betekent voor de emissie van broeikasgassen. In de kennisgroep Melk&Klimaat van VKA werken melkveehouders, samen met FrieslandCampina, aan het verminderen van de ‘carbonfootprint’ van melk
Comparison of model concepts for nutrient availability and soil acidity in terrestrial ecosystems
Kros, J. ; Mol, J.P. ; Vries, W. de; Fujita, Y. ; Witte, J.P.M. - \ 2017
Nieuwegein : KWR - 90 p.
STOWA heeft het initiatief genomen om samen met een aantal partijen een klimaatrobuuste Waterwijzer Natuur (WWN) te ontwikkelen. Een instrument dat de effecten van klimaatverandering en het waterbeheer op de terrestrische vegetatie van natuurgebieden dient te kunnen berekenen. Klimaatverandering zal vooral gevolgen voor natuurlijke vegetaties hebben via veranderingen in de waterbalans. Die veranderingen werken namelijk door op de bodemtemperatuur en de hoeveelheid vocht, zuurstof en nutriënten die voor de planten in het wortelmilieu beschikbaar zijn. Klimaatverandering noopt dan ook tot het stellen van enkele essentiële vragen, zoals: Welke maatregelen zijn er nodig om natuurdoelen in de toekomst zeker te stellen? Welke alternatieve doelen kunnen we overwegen als in het verleden vastgestelde natuurdoelen niet meer haalbaar blijken te zijn onder een veranderend klimaat? Waar liggen straks, in het klimaat van de toekomst, de beste kansen voor het creëren van hotspots van biodiversiteit? Dit rapport geeft een overzicht van de overeenkomsten en verschillen van de wijze waarop PROBE (KWR) en VSD+ (WEnR) de nutriëntenbeschikbaarheid en zuurgraad in (half)natuurlijke terrestrische ecosystemen voorspellen in afhankelijkheid van milieu, (vnl. atmosferische depositie), klimaat (vnl. temperatuur en neerslag) en waterbeheerscenario’s.
Mogelijke oorzaken van een dalende opbrengst van witte klaver (Trifolium repens L.) in de tijd
Boer, H.C. de; Eekeren, N. van - \ 2017
Wageningen : Wageningen Livestock Research (Wageningen Livestock Research rapport 1025) - 36
trifolium repens - opbrengsten - reductie - voedingsstoffen - melkveehouderij - yields - reduction - nutrients - dairy farming
Onderzoek naar oorzaken en oplossingen van grasklaverdaling in de landbouw.
Long-term patterns in fish phenology in the western Dutch Wadden Sea in relation to climate change
Walraven, Lodewijk Van; Dapper, Rob ; Nauw, Janine J. ; Tulp, Ingrid ; Witte, Johannes IJ. ; Veer, Henk W. van der - \ 2017
Journal of Sea Research 127 (2017). - ISSN 1385-1101 - p. 173 - 181.
Long-term changes - Phenology - Fish fauna - Wadden Sea - Temperature
Long-term patterns in fish phenology in the western Dutch Wadden Sea were studied using a 53 year (1960–2013) high resolution time series of daily kom-fyke catches in spring and autumn. Trends in first appearance, last occurrence and peak abundance were analysed for the most common species in relation to mode of life (pelagic, demersal, benthopelagic) and biogeographic guild (northern or southern distribution). Climate change in the western Wadden Sea involved an increase in water temperature from 1980 onwards. The main pattern in first day of occurrence, peak occurrence and last day of occurrence was similar: a positive trend over time and a correlation with spring and summer water temperature. This is counterintuitive; with increasing temperature, an advanced immigration of fish species would be expected. An explanation might be that water temperatures have increased offshore as well and hence fish remain longer there, delaying their immigration to the Wadden Sea. The main trend towards later date of peak occurrence and last day of occurrence was in line with our expectations: a forward shift in immigration into the Wadden Sea implies also that peak abundance is delayed. As a consequence of the increased water temperature, autumn water temperature remains favourable longer than before. For most of the species present, the Wadden Sea is not near the edge of their distributional range. The most striking phenological shifts occurred in those individual species for which the Wadden Sea is near the southern or northern edge of their distribution.
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