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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Greater mindful eating practice is associated with better reversal learning
Janssen, Lieneke K. ; Duif, Iris ; Loon, Ilke Van; Vries, Jeanne H.M. De; Speckens, Anne E.M. ; Cools, Roshan ; Aarts, Esther - \ 2018
Scientific Reports 8 (2018)1. - ISSN 2045-2322

Mindfulness-based interventions are thought to reduce compulsive behavior such as overeating by promoting behavioral flexibility. Here the main aim was to provide support for mindfulness-mediated improvements in reversal learning, a direct measure of behavioral flexibility. We investigated whether an 8-week mindful eating intervention improved outcome-based reversal learning relative to an educational cooking (i.e., active control) intervention in a non-clinical population. Sixty-five healthy participants with a wide BMI range (19-35 kg/m2), who were motivated to change their eating habits, performed a deterministic reversal learning task that enabled the investigation of reward- and punishment-based reversal learning at baseline and following the intervention. No group differences in reversal learning were observed. However, time invested in the mindful eating, but not the educational cooking intervention correlated positively with changes in reversal learning, in a manner independent of outcome valence. These findings suggest that greater amount of mindfulness practice can lead to increased behavioral flexibility, which, in turn, might help overcome compulsive eating in clinical populations.

Less salt, but then wat? Healthier recipes are a headache for scientists
Quataert, Miriam ; Meinders, Marcel ; Dijksterhuis, Garmt ; Geleijnse, Marianne - \ 2018
Nutritional Information Provision to Cancer Patients and Their Relatives Can Promote Dietary Behavior Changes Independent of Nutritional Information Needs
Veen, Merel R. van; Winkels, Renate M. ; Janssen, Silvie H.M. ; Kampman, Ellen ; Beijer, Sandra - \ 2018
Nutrition and Cancer 70 (2018)3. - ISSN 0163-5581 - p. 483 - 489.
We investigated whether obtaining nutritional information influences reported changes in dietary behavior in cancer survivors and their relatives and whether nutritional information needs influence this association. We included 239 cancer survivors and their relatives, recruited from an online panel of cancer survivors and relatives. This panel completed a survey about their experiences with nutritional information provision by healthcare professionals and the media in the period after diagnosis, their information needs regarding nutrition and cancer, and whether they changed their dietary behavior since diagnosis. The survey showed that 56% of respondents obtained nutritional information, mostly during treatment. Respondents who obtained nutritional information more often reported to have altered their dietary behavior after diagnosis. This association was not altered by having information needs. The reported changes in dietary behavior were coherent with the recommendations of the World Cancer Research Fund: respondents reported to choose less products that promote weight gain, increased intake of plant foods, and decreased meat and alcohol use. Respondents who obtained nutritional information more often changed their dietary behavior, regardless whether they had nutritional information needs. This might be an indication that healthcare professionals should provide nutritional information not only to those expressing a need for nutritional information.
The Effect of Gel Microstructure on Simulated Gastric Digestion of Protein Gels
Opazo-Navarrete, Mauricio ; Altenburg, Marte D. ; Boom, Remko M. ; Janssen, Anja E.M. - \ 2018
Food Biophysics (2018). - ISSN 1557-1858 - p. 1 - 15.
Pea protein concentrate - Plant proteins - Protein gel structure - Simulated gastric digestion - Soy protein isolate
The objective of this study was to analyse the impact of the gel structure obtained by different heat-induced temperatures on the in vitro gastric digestibility at pH 2. To achieve this, gels were prepared from soy protein, pea protein, albumin from chicken egg white and whey protein isolate at varying temperatures (90, 120 and 140 °C) for 30 min. Gels were characterised prior to digestion via microstructure and SDS-PAGE analysis. Subsequently, the gastric digestion process was followed via the protein hydrolysis and HPSEC analysis up to 180 min. Peptides of different sizes (<5 kDa) were gradually formed during the digestion. Our results showed that gels induced at 140 °C were digested faster. The protein source and gelation temperature had great influence on the in vitro gastric protein digestibility.
Loss of angiopoietin-like 4 (ANGPTL4) in mice with diet-induced obesity uncouples visceral obesity from glucose intolerance partly via the gut microbiota
Janssen, Aafke W.F. ; Katiraei, Saeed ; Bartosinska, Barbara ; Eberhard, Daniel ; Willems van Dijk, Ko ; Kersten, Sander - \ 2018
Diabetologia (2018). - ISSN 0012-186X - p. 1 - 12.
Angiopoietin-like 4 - Antibiotics - Glucose tolerance - Gut microbiota - Insulin secretion - White adipose tissue
Aims/hypothesis: Angiopoietin-like 4 (ANGPTL4) is an important regulator of triacylglycerol metabolism, carrying out this role by inhibiting the enzymes lipoprotein lipase and pancreatic lipase. ANGPTL4 is a potential target for ameliorating cardiometabolic diseases. Although ANGPTL4 has been implicated in obesity, the study of the direct role of ANGPTL4 in diet-induced obesity and related metabolic dysfunction is hampered by the massive acute-phase response and development of lethal chylous ascites and peritonitis in Angptl4−/− mice fed a standard high-fat diet. The aim of this study was to better characterise the role of ANGPTL4 in glucose homeostasis and metabolic dysfunction during obesity. Methods: We chronically fed wild-type (WT) and Angptl4−/− mice a diet rich in unsaturated fatty acids and cholesterol, combined with fructose in drinking water, and studied metabolic function. The role of the gut microbiota was investigated by orally administering a mixture of antibiotics (ampicillin, neomycin, metronidazole). Glucose homeostasis was assessed via i.p. glucose and insulin tolerance tests. Results: Mice lacking ANGPTL4 displayed an increase in body weight gain, visceral adipose tissue mass, visceral adipose tissue lipoprotein lipase activity and visceral adipose tissue inflammation compared with WT mice. However, they also unexpectedly had markedly improved glucose tolerance, which was accompanied by elevated insulin levels. Loss of ANGPTL4 did not affect glucose-stimulated insulin secretion in isolated pancreatic islets. Since the gut microbiota have been suggested to influence insulin secretion, and because ANGPTL4 has been proposed to link the gut microbiota to host metabolism, we hypothesised a potential role of the gut microbiota. Gut microbiota composition was significantly different between Angptl4−/− mice and WT mice. Interestingly, suppression of the gut microbiota using antibiotics largely abolished the differences in glucose tolerance and insulin levels between WT and Angptl4−/− mice. Conclusions/interpretation: Despite increasing visceral fat mass, inactivation of ANGPTL4 improves glucose tolerance, at least partly via a gut microbiota-dependent mechanism.
Op weg naar de echte prijs, echte waarde en echte winst van voedsel : Een routekaart om te sturen op de maatschappelijke effecten van voedsel
Groot Ruiz, Adrian de; Baltussen, Willy ; Adelhart Toorop, Renier de; Elzen, Floor van den; Janssen, Bas ; Keeken, Roland van; Logatcheva, Katja ; Martinius, Evelijn ; Ponsioen, Tommie - \ 2018
Wageningen : Wageningen Economic Research (Wageningen Economic Research rapport 2018-016) - 85
Spatial heterogeneity in critical nutrient loads of large shallow lakes : implications for Lake Taihu (China)
Janssen, A.B.G. ; Jager, Victor de; Kong, X. ; Mooij, W.M. - \ 2018
Response of submerged macrophyte communities to external and internal restoration measures in north temperate shallow lakes
Hilt, Sabine ; Alirangues Nuñez, Marta M. ; Bakker, Elisabeth S. ; Blindow, Irmgard ; Davidson, Thomas A. ; Gillefalk, Mikael ; Hansson, Lars Anders ; Janse, Jan H. ; Janssen, Annette B.G. ; Jeppesen, Erik ; Kabus, Timm ; Kelly, Andrea ; Köhler, Jan ; Lauridsen, Torben L. ; Mooij, Wolf M. ; Noordhuis, Ruurd ; Phillips, Geoff ; Rücker, Jacqueline ; Schuster, Hans Heinrich ; Søndergaard, Martin ; Teurlincx, Sven ; Weyer, Klaus van de; Donk, Ellen van; Waterstraat, Arno ; Willby, Nigel ; Sayer, Carl D. - \ 2018
Frontiers in Plant Science 9 (2018). - ISSN 1664-462X
Aquaticplants - Biomanipulation - Eutrophication - Lakerestoration - Nutrient loadreduction - PCLake - Plant traits - Regime shift
Submerged macrophytes play a key role in north temperate shallow lakes by stabilizing clear-water conditions. Eutrophication has resulted in macrophyte loss and shifts to turbid conditions in many lakes. Considerable efforts have been devoted to shallow lake restoration in many countries, but long-term success depends on a stable recovery of submerged macrophytes. However, recovery patterns vary widely and remain to be fully understood. We hypothesize that reduced external nutrient loading leads to an intermediate recovery state with clear spring and turbid summer conditions similar to the pattern described for eutrophication. In contrast, lake internal restoration measures can result in transient clear-water conditions both in spring and summer and reversals to turbid conditions. Furthermore, we hypothesize that these contrasting restoration measures result in different macrophyte species composition, with added implications for seasonal dynamics due to differences in plant traits. To test these hypotheses, we analyzed data on water quality and submerged macrophytes from 49 north temperate shallow lakes that were in a turbid state and subjected to restoration measures. To study the dynamics of macrophytes during nutrient load reduction, we adapted the ecosystem model PCLake. Our survey and model simulations revealed the existence of an intermediate recovery state upon reduced external nutrient loading, characterized by spring clear-water phases and turbid summers, whereas internal lake restoration measures often resulted in clear-water conditions in spring and summer with returns to turbid conditions after some years. External and internal lake restoration measures resulted in different macrophyte communities. The intermediate recovery state following reduced nutrient loading is characterized by a few macrophyte species (mainly pondweeds) that can resist wave action allowing survival in shallowareas, germinate early in spring, have energy-rich vegetative propagules facilitating rapid initial growth and that can complete their life cycle by early summer. Later in the growing season these plants are, according to our simulations, outcompeted by periphyton, leading to late-summer phytoplankton blooms. Internal lake restoration measures often coincide with a rapid but transient colonization by hornworts, waterweeds or charophytes. Stable clear-water conditions and a diverse macrophyte flora only occurred decades after external nutrient load reduction or when measures were combined.
The effect of exercise on intestinal integrity and protein permeability
Janssen Duijghuijsen, L.M. ; Keijer, J. ; Mensink, M.R. ; Bastiaan-Net, S. ; Mes, J.J. ; Luiking, Yvette ; Wichers, H.J. ; Witkamp, R.F. ; Norren, K. van - \ 2018
Fusarium infection and trichothecenes in barley and its comparison with wheat
Janssen, Esmee ; Liu, C. ; Fels, H.J. van der - \ 2018
World Mycotoxin Journal 11 (2018)1. - ISSN 1875-0710 - p. 33 - 46.
Barley is a small-grain cereal that can be infected by Fusarium spp. resulting in reduced quality and safety of harvested barley (products). Barley and other small-grain cereals are commonly studied together for Fusarium infection and related mycotoxin contamination, since the infection and its influencing factors are assumed to be the same for all small-grain cereals. Using relevant literature, this study reviewed Fusarium spp. infection and mycotoxin contamination, mainly T-2/HT-2 toxin and deoxynivalenol (DON), in barley specifically. For the first time, review results provide an extensive overview of the influencing factors for Fusarium infection and mycotoxin production in barley, such as weather, agricultural management and processing factors, and includes the comparison of these mechanisms in wheat. Results showed that Fusarium infection in barley is difficult to recognise in the field and mycotoxin levels cannot be estimated based on the symptoms. These factors make it difficult to establish the real severity of Fusarium infection in barley. In addition, most pre-harvest measures to mitigate initial Fusarium infection, such as cultivar use and soil cultivation, are the same for barley and wheat, but due to anatomical differences, some pre-harvest measures have a different effect on Fusarium infection in barley. For example, the effective moment (days after anthesis) of fungicide application in barley and wheat is different. Also, in wheat, there is an additional effect of multiple fungicide applications in reducing Fusarium Head Blight and DON concentrations, whereas in barley, no additional effect of multiple application is seen. Hence, care should be taken to use data from one small-grain cereal to draw conclusions on other small-grain cereals
Design of triphasic poly(lactic-co-glycolic acid) nanoparticles containing a perfluorocarbon phase for biomedical applications
Swider, Edyta ; Staal, Alexander H.J. ; Riessen, N. Van; Jacobs, Linsey ; White, Paul B. ; Fokkink, Remco ; Janssen, Geert Jan ; Dinther, Eric Van; Figdor, Carl G. ; Vries, I.J.M. De; Koshkina, Olga ; Srinivas, Mangala - \ 2018
RSC Advances : An international journal to further the chemical sciences 8 (2018)12. - ISSN 2046-2069 - p. 6460 - 6470.
Poly(lactic-co-glycolic acid) (PLGA) particles are very widely used, particularly for drug delivery, including commercial clinical formulations. Adding perfluorocarbon (PFC) enables in vivo imaging and quantification of the PLGA particles through 19F NMR, MRS or MRI. PFCs are both hydrophobic and lipophobic at the same time. This property makes their encapsulation in particles challenging, as it requires the addition of a third immiscible phase during the emulsification process. Here we explore how different parameters affect the miniemulsion formation of particles loaded with perfluoro-15-crown-5-ether (PFCE). By changing the concentration of surfactant and type of solvent, we were able to control the radius of synthesized particles, between 85-200 nm. We assessed stability and release from the particles at different pH values, showing that hydrophobic agents are released from the particles by diffusion rather than degradation. With cell experiments, we show that primary human dendritic cells take up the particles without any apparent effect, including on cell migration. In summary, the control of synthesis conditions leads to particles with sufficient PFCE encapsulation, which are suitable for drug loading and cell labeling, and do not affect cell viability or functionality. Finally, these nanoparticles can be produced at GMP-grade for clinical use.
Surfactant selection for a liquid foam-bed photobioreactor
Janoska, Agnes ; Vázquez, María ; Janssen, Marcel ; Wijffels, René H. ; Cuaresma, María ; Vílchez, Carlos - \ 2018
Biotechnology Progress (2018). - ISSN 8756-7938
Foam-bed reactor - Liquid-foam - Microalgae - Surfactant
A novel liquid foam-bed photobioreactor has been shown to hold potential as an innovative technology for microalgae production. In this study, a foam stabilizing agent has been selected which fits the requirements of use in a liquid foam-bed photobioreactor. Four criteria were used for an optimal surfactant: the surfactant should have good foaming properties, should not be rapidly biodegradable, should drag up microalgae in the foam formed, and it should not be toxic for microalgae. Ten different surfactants (nonionic, cationic, and anionic) and two microalgae genera (Chlorella and Scenedesmus) were compared on the above-mentioned criteria. The comparison showed the following facts. Firstly, poloxameric surfactants (Pluronic F68 and Pluronic P84) have acceptable foaming properties described by intermediate foam stability and liquid holdup and small bubble size. Secondly, the natural surfactants (BSA and Saponin) and Tween 20 were easily biodegraded by bacteria within 3 days. Thirdly, for all surfactants tested the microalgae concentration is reduced in the foam phase compared to the liquid phase with exception of the cationic surfactant CTAB. Lastly, only BSA, Saponin, Tween 20, and the two Pluronics were not toxic at concentrations of 10 CMC or higher. The findings of this study indicate that the Pluronics (F68 and P84) are the best surfactants regarding the above-mentioned criteria. Since Pluronic F68 performed slightly better, this surfactant is recommended for application in a liquid foam-bed photobioreactor.
Leerboek Natuurinclusieve Landbouw
Dijkshoorn-Dekker, M.W.C. ; Polman, N.B.P. ; Cnossen, G. ; Janssen, H. ; Nijman, Jan - \ 2018
Wageningen : Groen Kennisnet
Het doel van het leerboek is studenten in vmbo en mbo inzicht te geven in de mogelijkheden van natuurinclusieve landbouw. Hoe kun je op je bedrijf rekening houden met natuur? Of hoe kun je natuur integreren in je bedrijfsvoering? Naast informatie vind je in dit leerboek daarom ook opdrachten, hulpmiddelen en verdiepende leerstof.
Cost-benefit analysis of aquaculture breeding programs
Janssen, Kasper ; Saatkamp, Helmut ; Komen, Hans - \ 2018
Genetics, Selection, Evolution 50 (2018)1. - ISSN 0999-193X
Background: Profitability of breeding programs is a key determinant in the adoption of selective breeding, and can be evaluated using cost-benefit analysis. There are many options to design breeding programs, with or without a multiplier tier. Our objectives were to evaluate different breeding program designs for aquaculture and to optimize the number of selection candidates for these programs. Methods: The baseline was based on an existing breeding program for gilthead seabream, where improvement of the nucleus had priority over improvement of the multiplier tier, which was partly replaced once every 3 years. Alternative breeding programs considered were annual multiplier tier replacement, annual multiplier tier replacement with priority on improvement of the multiplier tier, and a program without a multiplier tier. Cost-benefit analyses were performed to compare breeding programs. The outcomes were used to describe relationships between profitability and the number of selection candidates, length of the time horizon, and production output, and to estimate the optimum numbers of selection candidates. Results: The baseline breeding program was profitable after 5 years and reached a net present value of 2.9 million euro in year 10. All alternative programs were more profitable up to year 17. The program without a multiplier tier was the most profitable one up to year 22, followed by the program with annual multiplier tier replacement and nucleus priority. The optimum number of selection candidates increased with the length of the time horizon and production output. Conclusions: The baseline breeding program was profitable after 5 years. For a short time horizon, putting priority on improvement of the multiplier tier over the nucleus is more profitable than putting priority on nucleus improvement, and vice versa for a long time horizon. Use of a multiplier tier increases the delay between costs made for selection and resulting benefits. Thus, avoiding the use of a multiplier tier will increase the profitability of the breeding program in the short term. The optimum number of selection candidates increases with the length of the time horizon and production output. Using too many selection candidates relative to the optimum leads to less reduction in profitability than using too few selection candidates.
Biogeographic variability of coastal perennial grasslands at the European scale
Vecchio, S. Del; Fantinato, E. ; Janssen, J.A.M. ; Bioret, F. ; Acosta, A. ; Prisco, I. ; Tzonev, R. ; Marcenò, C. ; Rodwell, J. ; Buffa, G. - \ 2018
Applied Vegetation Science (2018). - ISSN 1402-2001
Azonal habitats - Climatic gradient - Dune habitats - Endemism - Habitat classification - Meta-analysis - Phytosociological data - Vegetation gradient - Vegetation structure
Question: Coastal environments have often been described as azonal. While this characteristic is clear for the foredune system, it seems less evident for more inland fixed dunes, which host habitats of major conservation concern, whose features seem to be more related to local climatic conditions. We hypothesized that, unlike other coastal habitats, dune perennial grasslands differ floristically and structurally across their European range and that patterns of variation are linked to the corresponding climate. Location: European coasts (Atlantic Ocean, Baltic, Mediterranean, Black Sea). Methods: We used a large data set of phytosociological relevés, representative of coastal grasslands throughout their European range. The role of climatic variables (temperature, precipitation and continentality) in determining the variability in species composition and vegetation structure (by means of life forms) was investigated through CCA, DCA and GLM. The degree of concentration of species occurrences within groups was calculated through the Phi coefficient. Results: Through multivariate analyses we identified seven major types of coastal grassland, corresponding to different geographic areas. The groups significantly differed in their climatic envelope, as well as in their species composition and community structure. Conclusion: Our results confirm the hypothesis that coastal dune perennial grasslands are subjected to local climate, which exerts significant effects on both floristic composition and community structure. As a consequence, coastal grasslands are particularly prone to the effect of possible climate change, which may alter species composition and distribution, and lead to shifts in the distribution of native plant communities.
Playing by the rules? Analysing incremental urban developments
Karnenbeek, Lilian van; Janssen-Jansen, Leonie - \ 2018
Land Use Policy 72 (2018). - ISSN 0264-8377 - p. 402 - 409.
Collective action - Incremental urban development - Institutional change - Rules - Urban planning
Current urban developments are often considered outdated and static, and the argument follows that they should become more adaptive. In this paper, we argue that existing urban development are already adaptive and incremental. Given this flexibility in urban development, understanding changes in the so-called ‘rules of the game’ which structure and change collective action, is increasingly relevant. Gaining such insights advances the ability of planners to deal with perceived spatial problems. The aim of this paper is twofold. First, to develop an analytical framework for scrutinizing changes in rules in incremental urban developments and second, to test the analytical framework in a real-life incremental urban development. Building on Ostrom's IAD Framework we develop an analytical framework that makes a distinction between formal and informal rules, connects sets of rules, actors and interaction patterns and provides a comparative, longitudinal perspective. The case of the Navy Yard in Amsterdam, the Netherlands is used in order to test the framework's application, proving the relevance of investigating how rules in urban development change.
Extending the baseline of tropical dry forest loss in Ghana (1984–2015) reveals drivers of major deforestation inside a protected area
Janssen, Thomas A.J. ; Ametsitsi, George K.D. ; Collins, Murray ; Adu-Bredu, Stephen ; Oliveras, Imma ; Mitchard, Edward T.A. ; Veenendaal, Elmar M. - \ 2018
Biological Conservation 218 (2018). - ISSN 0006-3207 - p. 163 - 172.
Tropical dry forests experience the highest deforestation rates on Earth, with major implications for the biodiversity of these ecosystems, as well as for its human occupants. Global remote sensing based forest cover data (2000 − 2012) point to the rapid loss of tropical dry forest in South America and Africa, also, if not foremost, inside formally protected areas. Here, we significantly extend the baseline of tropical dry forest loss inside a protected area in Ghana using a generalizable change detection technique. The forest cover change detection is based on the normalized difference vegetation index (NDVI) derived from historical Landsat data (1984–2015). Field measurements were carried out in dry semi-deciduous forest and in the adjacent savanna and woodland. Estimates of the canopy area index and above ground woody biomass were related to NDVI derived from Landsat 8 data. The change detection indicated significant NDVI decrease in a large area initially covered by tropical dry forest, associated with deforestation. The peak in deforestation was found to have occurred between 1990 and 2002, hereafter, the conservation status of the area was improved. A combination of remote sensing data corroborated by secondary data sources provides evidence for the almost complete clearance of a tropical dry forest inside a strictly protected area, attributable to logging and land clearing for arable farming. The NDVI change detection also revealed NDVI increase in the adjacent woodlands from 2002 to 2015, demonstrating woody encroachment. Historical fire data from the MODIS burned area product indicate that the deforested area experienced a high frequency of anthropogenic burning since 2004, which may have caused further degradation and largely prevents forest regeneration. The results show the ongoing destruction of tropical ecosystems even within ostensibly protected areas and ask for the revision of protection and management strategies of such areas.
Phytophagy of omnivorous predator Macrolophus pygmaeus affects performance of herbivores through induced plant defences
Zhang, Nina Xiaoning ; Messelink, Gerben J. ; Alba, Juan M. ; Schuurink, R.C. ; Kant, Merijn R. ; Janssen, Arne - \ 2018
Oecologia 186 (2018)1. - ISSN 0029-8549 - p. 101 - 113.
Frankliniella occidentalis - Myzus persicae - Plant hormones - Tetranychus urticae
Plants possess various inducible defences that result in synthesis of specialized metabolites in response to herbivory, which can interfere with the performance of herbivores of the same and other species. Much less is known of the effects of plant feeding by omnivores. We found that previous feeding of the omnivorous predator Macrolophus pygmaeus on sweet pepper plants significantly reduced reproduction of the two-spotted spider mite Tetranychus urticae and western flower thrips Frankliniella occidentalis on the same plants, also on leaves that had not been exposed to the omnivore. In contrast, no effect was found on the reproduction of the green peach aphid Myzus persicae. Juvenile survival and developmental time of T. urticae and M. persicae, and larval survival of F. occidentalis were not affected by plant feeding by M. pygmaeus. Larvae of F. occidentalis feeding on leaves previously exposed to M. pygmaeus required longer to develop into adults. Defence-related plant hormones were produced locally and systemically after exposure to M. pygmaeus. The concentrations of 12-oxo-phytodienoic acid and jasmonic acid–isoleucine in the attacked leaves were significantly higher than in the corresponding leaves on the uninfested plants, and jasmonic acid concentrations showed the same trend, suggesting that jasmonic-acid-related defence pathways were activated. In contrast, similar concentrations of salicylic acid were found in the attacked leaves of M. pygmaeus-infested plants and uninfested plants. Our results show that plant feeding by omnivorous predators decreases the performance of herbivores, suggesting that it induces plant defences.
Correction to : Phytophagy of omnivorous predator Macrolophus pygmaeus affects performance of herbivores through induced plant defences
Zhang, Nina Xiaoning ; Messelink, Gerben J. ; Alba, Juan M. ; Schuurink, R.C. ; Kant, Merijn R. ; Janssen, Arne - \ 2018
Oecologia 186 (2018)1. - ISSN 0029-8549 - p. 115 - 115.
Unfortunately, the citation of one of the papers was published erroneously in the original version and corrected here by this Erratum. The original article was corrected.
On the development and use of farm models for policy impact assessment in the European Union – A review
Reidsma, Pytrik ; Janssen, Sander ; Jansen, Jacques ; Ittersum, Martin K. van - \ 2018
Agricultural Systems 159 (2018). - ISSN 0308-521X - p. 111 - 125.
Agent-based model - Bio-economic farm model - Integrated assessment - Mathematical programming - Policy analysis - Science-policy interaction
Farm models are potentially relevant tools for policy impact assessment. Governments and international organizations use impact assessment (IA) as an ex-ante policy process and procedure to evaluate impacts of policy options as part of the introduction of new policies. IA is increasingly used. This paper reviews both the use of farm models in such policy IAs in the European Commission, and the development and use of farm models for policy IA by the scientific community over the past decade. A systematic review was performed, based on 202 studies from the period 2007–2015 and results were discussed in a science-policy workshop. Based on the literature review and the workshop, this paper describes progress in the development of farm models, challenges in their use in policy processes and a research and cooperation agenda. We conclude that main issues for a research agenda include: 1) better understanding of farmer decision-making and effects of the social milieu, with increased focus on the interactions between farmers and other actors, the link to the value chain, and farm structural change; 2) thorough and consistent model evaluation and model comparison, with increased attention for model sensitivity and uncertainty, and 3) the organization of a network of farm modellers. In addition, the agenda for science-policy cooperation emphasizes the need for: 4) synthesizing research evidence into systematic reviews as an institutional element in the existing science-policy-interfaces for agricultural systems, 5) improved and timely data collection, allowing to assess heterogeneity in farm objectives, management and indicators, and 6) stronger science-policy interaction, moving from a research-driven to a user-driven approach.
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