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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Farmers’ willingness to invest in livestock disease control: the case of voluntary vaccination against bluetongue
Sok, Jaap - \ 2017
University. Promotor(en): Alfons Oude Lansink; Henk Hogeveen, co-promotor(en): Armin Elbers. - Wageningen : Wageningen University - ISBN 9789463437059 - 214
business economics - farmers - livestock - vaccination - bluetongue virus - animal diseases - animal disease prevention - netherlands - bedrijfseconomie - boeren - vee - vaccinatie - bluetonguevirus - dierziekten - dierziektepreventie - nederland

Animal health authorities in the European Union nowadays consider voluntary approaches based on a neoliberal model of cost and responsibility sharing as a tool for controlling livestock diseases. Policy makers aim for policies that are soft and optional, and use insights from behavioural economics and social psychology. Voluntary approaches are flexible in terms of legislation and can be effective at lower costs, provided that farmers are willing to participate. In 2008, the Dutch animal health authorities used a voluntary vaccination approach to control an emerging bluetongue epidemic that started end of 2006. Nearly 60,000 holdings with ruminants were already affected by the end of 2007 and experts indicated that transmission could only be stopped through mass vaccination. Farmers were motivated to participate by informational and financial, incentive-based policy instruments.

Economic theory predicts that farmers underinvest in private disease control measures in the presence of externalities. These studies, however, assume farmers only consider the private economic motives and that they only can be extrinsically motivated via (monetary) incentives. If the willingness to invest in livestock disease control is also driven by intrinsic and social motives, this could imply that not only financial compensation, but a mix of policy instruments is needed to make voluntary approaches work.

The overarching research objective of this thesis was to assess the key determinants of farmers’ willingness to vaccinate against bluetongue and study the impact of different policy designs on the effectiveness of voluntary vaccination approaches to bluetongue disease control.

A three-stage research approach was conducted. Two models of decision making, one from economics and one from social psychology, were first applied to the case study to obtain a solid understanding of important perceptions and motivations that farmers have to invest in livestock disease control. These motivations (sometimes incentives) and perceptions were then related to different attributes of a vaccination scheme to have a better understanding of how a higher uptake can be obtained. In the third stage, the effect of the interplay between farmers’ collective behaviour and disease epidemiology on disease rate and vaccination uptake was studied.

Expected utility theory was used in combination with decision analysis and Monte Carlo simulation in chapter 2. The economic risk and monetary outcomes of the vaccination decision were considered, intrinsic or social motives ignored. The theoretical expectation from the analysis is that with high probabilities of herd exposure and disease effects at the start of the outbreak the farmer decides to vaccinate. Re-vaccination is uncertain during the course of the epidemic due to a lower probability of herd exposure and enduring protection against infection from previous vaccination. Factors that make re-vaccination more likely to happen are risk-averse behaviour and farm management aimed at the export of heifers. The decision moment – before or during an epidemic – and the characteristics of the disease – endemic, epidemic or emerging – are important factors in perceptions of disease risk.

Chapters 3 to 5 used data from a survey that was based on the reasoned action approach. Data were analysed with a variety of statistical, mostly multivariate, techniques. The relative importance of the social-psychological constructs in predicting the intention to participate in a hypothetical reactive vaccination scheme against bluetongue was assessed in chapter 3. It was found that intended vaccination behaviour was mainly explained by farmers’ attitude, but also by social pressures from injunctive and descriptive norms. Perceived behavioural control was the least important predictor of intention.

The most influential beliefs underlying the social-psychological constructs were assessed in chapter 4. Results suggested that instrumental beliefs (e.g. risk reduction) as well as experiential beliefs (e.g. animal welfare) were important drivers of the attitude towards vaccination against bluetongue. This indicates that in addition to monetary outcomes of the decision, at least a group of farmers also consider the non-monetary (or non-pecuniary) outcomes. The results further showed that the most influencing referents for the farmer are the veterinarian, his or her family members and colleague dairy farmers (peers). Two influencing control beliefs were associated with the provision of information and perceived trust and confidence in the vaccine safety, effectiveness and government approach to control the disease.

The aim of chapter 5 was to explore factors that could explain heterogeneity in farmers’ attitudinal beliefs. In particular, perceived risk, measured by a relative risk attitude and risk perception, and the Big Five personality traits were associated with variability in these beliefs. Conscientiousness discriminated farmers into a group of ‘vaccination intenders’ and non-intenders although it remained somewhat unclear how it relates to the decision problem, as it can be a sense of duty, achievement striving or both. The perceived risk measures were related to the milk production intensity and also discriminated intenders from non-intenders. These differences in perceived risk indicated that farmers might not be commonly risk averse, however, it is important to account for the domain specificity of risk taking behaviour.

A survey-based discrete choice experiment was used in chapter 6 to study more deeply farmers’ choices for different voluntary bluetongue vaccination scheme designs. A generalised random utility model of farmers’ behaviour allowed for heterogeneity in motives to invest in bluetongue disease control. Results showed that farmers have private economic motives (incentives) to participate in a vaccination scheme, such as to insure the production risk from disease infection and to maintain the export of heifers.

Interaction effects found between social-psychological constructs and specific designs of policy instruments highlighted the importance of perceived trust and confidence in the vaccine safety and effectiveness and in the disease control strategy chosen by animal health authorities. Attitude interacted positively with government communication (information) provided via veterinarians. Descriptive norm interacted positively with a lower perceived probability of adverse effects. This suggests that farmers are more likely to vaccinate if they perceive that others in their social network perform vaccination without experiencing adverse effects. Injunctive norm interacted negatively with a higher level of government subsidy. This suggested a crowding-out mechanism through which subsidization adversely affect farmer’s motivation to comply with the vaccination policy.

The interplay between farmers’ collective behaviour and bluetongue disease epidemiology was studied in chapter 7 with an agent-based model. The utility model specification from chapter 6 was used to describe the decision-making process of farmers. Other components that added to the dynamic nature of the model were a social network structure of the diffusion process of sharing information about vaccination status and a susceptible-latent-infectious-recovered model of disease spread. The effectiveness of different bluetongue vaccinations scheme designs was studied as measured by disease rate and vaccination uptake.

Results of chapter 7 showed that vaccination schemes that focus more on motivating farmers via informational instruments were somewhat more effective than predicted from the comparative static analysis in chapter 6. Motivation via financial incentives resulted in a somewhat lower effectiveness than was predicted from that same model. This might be explained as an emergent effect that evolves under specific vaccination scheme designs from the interactions between farmers themselves and with the environment from which they observe the progress of the disease. These schemes focus more on serving the information needs of farmers and raising the perceived trust and confidence in the disease control approach rather than on incentivising with higher levels of subsidy.

Three themes for livestock disease control emerged from the synthesis of the results in chapter 8, which were subsequently discussed in relation to the wider economic and (social) psychological literature. These themes coincide with shortcoming of the standard economic model of rational choice to describe and predict behaviour. The first theme was about understanding how farmers cope with risk in the context of livestock diseases. The second theme focused on the usefulness of financial compensation as a policy instrument. The third theme discussed the role of trust and social norms. After discussing the implications for policy making, main scientific contributions and suggestions for future research, the chapter concluded that:

Dutch dairy farmers who operate large-scale and intensive farms or keep heifers for export are likely to have private economic motives to vaccinate against bluetongue (Chapter 2, 4, 5 and 6).Farmers’ willingness to vaccinate against bluetongue is mostly driven by attitude, followed by perceived social pressures from injunctive norms and descriptive norms. This implies farmers can be motivated intrinsically, extrinsically, or both (Chapter 3).Dutch dairy farmers have intrinsic motives to vaccinate against bluetongue. They do not want to be confronted with animal suffering but want to keep job satisfaction high from working with healthy animals (Chapter 4).Dutch dairy farmers have social motives to vaccinate against bluetongue. They consider what important referents, such as the veterinarian or family members, think they should do and take into account the perceived behaviour of peers (Chapter 3 and 4).

Perceived risk, personality traits and past behaviour are important behavioural variables for explaining the heterogeneity in beliefs to vaccinate against bluetongue (Chapter 5).

The efficacy of financial, incentive based instruments to motivate to vaccinate against bluetongue is heterogeneous and not necessarily positive for each farmer. They are not effective if farmers already expect a positive net benefit from vaccination or if they crowd-out the motivation to comply with the vaccination policy (Chapter 2, 4, 6, 7).

The efficacy of informational policy instruments to motivate farmers to vaccinate against bluetongue is positively affected by farmers’ attitude towards vaccination and in case farmers perceive the communication channels used as credible and trustworthy (Chapter 3, 4, 6).

The efficacy of social interaction mechanisms in policy making, such as the perceived social pressuretovaccinateagainstbluetongue,ispositivelyaffectedbyfarmers’trustandconfidence in the government approach to control the disease (Chapter 4, 6, 7).

The SEEA EEA carbon account for the Netherlands
Lof, Marjolein ; Schenau, Sjoerd ; Jong, Rixt de; Remme, Roy ; Graveland, Cor ; Hein, Lars - \ 2017
The Hague : Statistics Netherlands - 64
carbon dioxide - netherlands - carbon - economics - environment - biofuels - bioenergy - biogas - emission - kooldioxide - nederland - koolstof - economie - milieu - biobrandstoffen - bio-energie - emissie
The carbon account provides a comprehensive overview of all relevant carbon stocks and flows. The carbon account for the Netherlands was developed within the scope of the ‘System of Environmental Economic Accounts – Experimen tal Ecosystem Accounting’ (SEEA EEA) project for the Netherlands (Natuurlijk Kapitaalrekeningen Nederland: NKR_NL), which is currently c arried out jointly by Statistics Netherlands and Wageningen University. Funding and support was provided by the Ministries of Economic Affairs and Infrastructure and the Environment. Within the NKR_NL project, a number of accounts are currently under devel opment. The carbon account is described in detail in this report.
Bringing in the floods : a comparative study on controlled flooding in the Dutch, Bangladesh and Vietnamese deltas
Staveren, Martijn F. van - \ 2017
University. Promotor(en): Jan van Tatenhove, co-promotor(en): Jeroen Warner; Flip Wester. - Wageningen : Wageningen University - ISBN 9789463437035 - 174
water management - flooding - deltas - hydraulic engineering - rivers - environmental management - environmental policy - environmental control - netherlands - vietnam - bangladesh - waterbeheer - inundatie - delta's - waterbouwkunde - rivieren - milieubeheer - milieubeleid - milieubeheersing - nederland

This thesis investigates contested initiatives to restore controlled flooding in the deltas of the Dutch, Bangladesh and Vietnamese (Mekong) deltas. Restoring controlled flooding is a seemingly contradictory measure in densely populated delta areas, where approaches based on full flood prevention has been typically dominant for decades. This has instigated the question how the emergence of restored controlled flooding initiatives can be explained. Related, this study reflects on how controlled flooding could contribute to long-term flood risk management and sustainable development in deltas, which are simultaneously attractive and vulnerable places for humans to live in. In order to answer this question, a case study approach has been used to investigate social, environmental and technological factors that have shaped controlled flooding initiatives. Cases have been identified that materialized under different conditions: from very dynamic delta environments to relatively stable ones, and from interventions driven by “top-down” policies to “bottom-up” action to modify or remove embankments. This thesis has an article-based structure, which means that individual chapters (2-5) have been designed for publication with peer reviewed academic journals. Chapter 1 provides the general background information, problem definition, and objectives. Chapter 6 ties together the findings of the individual case study chapters and presents the conclusions.

Chapter 2 conceptualizes deltas as interacting social-ecological-technological systems. It argues that a better understanding of how hydraulic infrastructure influences social processes and environmental dynamics in deltas is critical to understand how deltas evolve over time. By means of the delta trajectories concept, the chapter presents a way to understand this interaction. It also presents a way to understand the sustainability of a delta trajectory, and discusses how new flood management concepts might contribute to “realigning” the development trajectory towards more sustainable system states.

In Chapter 3, the first controlled flooding case is investigated. The Noordwaard is an agricultural polder, located at the junction of tides and riverine discharge in the Netherlands. As part of the Room for the River programme, the northern embankments were lowered which enables the inflow of water during high water levels in the river Merwede. This reduces peak water levels in the river, supports the adjacent freshwater Biesbosch wetland by means of restored water dynamics, but also affects the possibilities for agricultural production. The chapter highlights that a strong coupling can be observed between the domains of water safety and nature development objectives, and that a top-down decision concluded a long stakeholder negotiation processes. From the perspective of “subsiding polder lands,” controlled flooding is not regarded for its strategic importance, as excessive sedimentation would hamper the intended design discharge of the area.

Chapter 4 explores the Tidal River Management concept. In the coastal zone of Bangladesh, community-enforced embankment breaches have opened up some of the polders or low-lying areas called “beels,” and exposed them to tidal influence again. Besides stimulating agricultural production and providing safer places to live in, the extensive network of polder embankments also caused increased sedimentation in the region’s rivers, and water logging in enclosed areas due to insufficient drainage possibilities. The chapter highlights that policy debates in Bangladesh have revolved around adopting “open” or “closed” approaches, where TRM represents a hybrid form. The case showed that TRM involves water management and sediment management, and that it represented a “social opening up” for local communities and NGOs to get involved with water projects and embankment removal.

Plans to restore seasonal flooding in the Mekong delta are center stage in Chapter 5. The Mekong delta system is very dynamic and dealing with the delta’s water resources, in connection with intensive rice production, have been heavily debated by Vietnamese and international policy makers. This chapter investigates a number of older and more recent long-term development plans for the Mekong delta. This analysis highlights how ideas about controlled flooding and flood control have gradually evolved over time. The most recent delta management plan suggests to restore seasonal flooding in some parts of the delta, as a way to safeguard downstream urban areas from peak flows, and as a way to improve the conditions for agricultural production.

Chapter 6 summarizes the findings of the case study chapters one by one, and concisely answers the research questions. It highlights key similarities and differences when it comes to social, environmental and technological dimensions, and discusses these findings with the literature on flood risk management policy, complex adaptive systems research, and delta studies. The findings demonstrate that environmental dynamics have been critical to emphasize the potential of restoring controlled flooding, but that social and technological factors have been important enablers or constrainers for controlled flooding initiatives to take shape. In itself, controlled flooding reconciles ecosystem-based ideas about flood management with more mainstream policies based on flood control. For this reason controlled flooding can be seen as a “niche-development” with limited influence on how flood management policies, and environmental delta systems, evolve. At the same time, controlled flooding has been acknowledged for its strategic opportunities, for example when it comes to diverting peak water discharges, land heightening by means of capturing suspended sediment, and by providing nutrient for agricultural. This offers opportunities for further thinking about and conceptual development of controlled flooding.

Food online : PhD thesis on food legal and civil law requirements for digital contracts regarding food purchases by consumers in the Netherlands
Veer, Lomme C. van der - \ 2017
University. Promotor(en): Bernd van der Meulen. - Wageningen : Wageningen University - ISBN 9789463437127 - 125
food - food consumption - food costs - food marketing - food merchandising - food prices - food legislation - consumers - product liability - regulations - law - internet - netherlands - food purchasing - voedsel - voedselconsumptie - kosten voor voedsel - marketing van voedingsmiddelen - reclamecampagne van voedsel - voedselprijzen - voedingsmiddelenwetgeving - consumenten - productaansprakelijkheid - regelingen - recht - nederland - voedselinkoop

In this thesis the research focuses on the legal rules and regulations in the Netherlands that apply in the context of food purchases by consumers that are concluded online. Sale of food via the Internet takes place in the area of Civil Code requirements on distance selling and public law requirements on food labelling. In four research Chapters (chapters 2-5) the relevant topics are addressed.

In Chapter 1 the legal context to the research is presented leading up to the formulation of the central problem statement and the research questions. The Chapter also provides the theoretical framework and the in this research applied methodology.

Chapter 2 ‘'Real Food from Virtual Shops: the situation before 2014’ reports on research performed before the entry into force of the national implementation of the Consumer Rights Directive and of the Food Information Regulation. This chapter provides the historical baseline to this research. The research in this chapter shows that the instruments handed to the consumers to compensate their weakened position as online buyers, cannot function as intended in case the merchandise is food. It is argued that consumers derive more bite from general provisions of contract law than from the provisions specifically addressing distance contracts.

In Chapter 3, ‘Food Online, Radical Changes to the Digital Shop Window after 2014’ the argument is continued by addressing in detail the implementation of the Consumer Rights Directive in the Netherlands and the entry into force of the Food Information Regulation. The differences become visible between civil law and public food legislation in the manner in which they envisage to protect the consumer. Civil law turns out to be rather scarce in requiring information provision to consumers. In his attempt to ensure that consumers are only bound to purchase contracts they actually want, the European legislator has chosen a far more draconic instrument. The consumer has been given the right to withdraw from the contract altogether after the etailer has already fulfilled his side of the agreement. The legislature has preferred this instrument over elaborate information requirements regarding the product to be purchased. The available data do not show that the legislature balanced these two instruments.

Whatever these reasons have been, they seem to have been less compelling in the case of food products. The vast majority of foods is exempted from the consumers' right to withdraw. This leaves a considerable gap in the civil law protection of consumers of food online. This gap has recently been filled by the Food Information Regulation. This regulation does put in place a considerable obligation to supply the consumer online with information prior to the purchase decision. The etailer has to provide online all the information which the producer is required to provide on the food label. In one small provision the entire and complex burden the Food Information Regulation places on the food industry, is placed with the etailer as well.

In Chapter 4 ‘Product Liability for Online Food Suppliers’ the increased risks for the etailer of foods to become product liable is addressed. Due to the wide scope of the definition of ‘producer’ in product liability law, the risk for the etailer to be considered the liable producer is rather high. Due to the Consumer Rights Directive and its implementation in national law, of all the players in the chain the etailer is easiest to identify for the consumer. Etailers have to push their claims further up the hill without any recourse to facilities regarding burden of proof or liability. Both the Consumer Rights Directive and the Food Information Regulation have been designed to reinforce the consumers’ position with a view to ensuring that consumers will no longer be the weakest link in the value chain.

In Chapter 5 'The Lucky Bag for Meals' the emerging market for food-boxes is discussed. Food-boxes embody the dream of every etailer. Not the consumers decide what they buy, but the retailers decide what they supply. Business economic advantages of this model in terms of stock management, logistics and marketing are obviously enormous. Apparently an important marketing proposition in this modern day ‘lucky bag’ is the surprise. It appears that consumers want to be surprised. Despite all requirements regarding transparency and information provision imposed by legislators upon the etailer with a view to protecting consumers, a part of the market seems to prefer to be kept uninformed. The chapter shows that a relevant group of consumers is actually willing to pay a price premium to businesses for infringing upon their legal obligations and for being kept out of their rights.

In Chapter 6 the findings of the research are presented. Besides the answers to the research questions a new series of questions emerge. These openings to further exploration show how the legal field of food online in legal development and legal scholarship is just as young as the technology that sparked its emergence.

The social dynamics of smart grids : On households, information flows & sustainable energy transitions
Naus, Joeri - \ 2017
University. Promotor(en): Gert Spaargaren, co-promotor(en): Bas van Vliet; Hilje van der Horst. - Wageningen : Wageningen University - ISBN 9789463436977 - 234
households - sustainable energy - energy consumption - supply - energy policy - netherlands - huishoudens - duurzame energie - energiegebruik - aanbod - energiebeleid - nederland

In international climate and energy policy the development of smart grids features as a critical new step in the transition towards a sustainable energy future. Smart grids enable two-way energy and information exchange between households and energy providers. Drawing on social practice theories, transition theories and informational governance, this thesis seeks to shed light on the changes that are taking place at the level of households: How do householders understand, handle and use new information flows? How can we conceptualise the interplay between households and smart energy systems? And what does this mean for householder participation in smart energy transitions? The thesis suggests that the key to understanding and governing the social dynamics of smart grids lies in the ‘Home Energy Management-practices’ (HEM-practices) that are emerging at the interface between households and wider energy systems.

Milieueffectrapportage van maatregelen zesde Actieprogramma Nitraatrichtlijn : Op planniveau
Groenendijk, P. ; Velthof, G.L. ; Schröder, J.J. ; Koeijer, T.J. de; Luesink, H.H. - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2842) - 109
nitraat - milieueffectrapportage - nederland - nitrate - environmental impact reporting - netherlands
Om aan de doelstellingen van de Nitraatrichtlijn te voldoen. wordt om de vier jaar een Actieprogramma geformuleerd waarin het rijksbeleid voor de komende vier jaar is aangegeven. In het 6e Actieprogramma wordt een aantal extra maatregelen doorgevoerd ten opzichte van het 5e Actieprogramma. In dit rapport worden de effecten van de extra maatregelen op het milieu (lucht, grondwater en oppervlaktewater) beschreven.
Ontwikkelen van een Remote Sensing monitoringssystematiek voor vegetatiestructuur : pilotstudie: detectie verruiging Grijze Duinen (H2130) voor het Natura 2000-gebied Meijendel-Berkheide
Mücher, Sander ; Kramer, Henk ; Wijngaart, Raymond van der; Huiskes, Rik - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2838) - 45
remote sensing - vegetatiemonitoring - duinen - nederland - vegetation monitoring - dunes - netherlands
Effect van mest op de biologische bodemkwaliteit in de Zeeuwse akkerbouw
Bloem, Jaap ; Koopmans, Chris ; Schils, René - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2843) - 53
dierlijke meststoffen - bodemkwaliteit - akkerbouw - zeeland - nederland - animal manures - soil quality - arable farming - netherlands
Dit rapport begint met een overzicht van de mestsamenstelling (hoofdstuk 2). Daarna volgt een beschrijving van bodemvruchtbaarheid in het algemeen en bodembiodiversiteit in het bijzonder (hoofdstuk 3). De analyse van effecten van mest is in hoofdstuk 4 beschreven.
Maatgevende afvoer en maaiveldafvoer in waterschap Vechtstromen : beschouwing over de bruikbaarheid van afvoernormen voor bepaling van veranderingen in de waterhuishouding en het optreden van maaiveldafvoer
Massop, H.Th.L. ; Bakel, P.J.T. ; Louw, P.G.B. de - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2839) - 71
drainage - waterbeheer - afvoer - oppervlakkige afvoer - klimaatverandering - nederland - water management - discharge - runoff - climatic change - netherlands
Dit rapport beschrijft (1) een evaluatie van de MA-methodiek (Maatgevende Afvoer) toegepast door harmonisatie van de legger van het waterschap Vechtstromen en brengt (2) de maaiveladafvoer voor het waterschapgebied in beeld.
Ploeg- en omzetverbod van blijvend grasland in Natura 2000-gebieden : beoordeling ecologische en milieu- effecten van eventuele opheffing in de Wieden Weerribben
Doorn, Anne ; Broekmeijer, Mirjam ; Schotman, Alex ; Lesschen, Jan Peter ; Geertsema, Willemien ; Korevaar, Hein ; Melman, Dick ; Schuiling, Rini - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2832) - 59
natura 2000 - bodembeheer - permanente graslanden - milieueffect - ecologische beoordeling - nederland - soil management - permanent grasslands - environmental impact - ecological assessment - netherlands
Pionieren : De impact van innovatieve maatschappelijke initiatieven op een natuur-inclusieve samenleving
Salverda, I.E. ; Dam, R.I. van; Pleijte, M. - \ 2017
Wageningen : Wageningen Environmental Research (Pionieren ) - 64 p.
natuur - samenleving - participatie - stedelijke gebieden - sport - lopen - burgers - fondsgelden - weidevogels - bodem - nederland - nature - society - participation - urban areas - walking - citizens - funding - grassland birds - soil - netherlands
Pionieren : Jaarmagazine over het DEMOCRATISCH samenspel van groene burgerinitiatieven en overheden
Salverda, I.E. ; Kruit, J. ; Kuijper, Florien ; Koffijberg, M. ; Neefjes, M. - \ 2017
Wageningen : Wageningen Environmental Research (Pionieren ) - 39 p.
natuur - openbaar groen - stedelijke gebieden - burgers - participatie - innovaties - vergroening - democratie - nederland - nature - public green areas - urban areas - citizens - participation - innovations - greening - democracy - netherlands
The Care Sport Connector in the Netherlands
Leenaars, Karlijn - \ 2017
University. Promotor(en): Maria Koelen, co-promotor(en): Annemarie Wagemakers; G.R.M. Molleman. - Wageningen : Wageningen University - ISBN 9789463436106 - 261
sport - sport policy - health care workers - physical activity - public health services - health promotion - primary health care - netherlands - case studies - physical education - sportbeleid - gezondheidswerkers - lichamelijke activiteit - voorzieningen ten behoeve van de volksgezondheid - gezondheidsbevordering - eerstelijnsgezondheidszorg - nederland - gevalsanalyse - lichamelijke opvoeding

To stimulate physical activity (PA) and guide primary care patients towards local PA facilities, Care Sport Connectors (CSC) (in Dutch Buurtsportcoach), to whom a broker role has been ascribed, were introduced in 2012. This function is new, and to our knowledge no study has yet explored a broker role and its impact on improving intersectoral collaboration between both sectors. The aim of this thesis was to explore CSCs’ role and impact in connecting the primary care and the PA sector.
This thesis employed a multiple case study design in which 15 CSCs from nine municipalities spread over the Netherlands were followed in their work from 2014 to the end of 2016. Different data collection methods were used (literature review, interviews, focus groups, document analysis, and questionnaires), and perspectives of different stakeholders (policymakers, professionals, CSCs) on different levels (policy and community) were taken into account (Chapter 2).

The connection between the primary care and the PA sector: a chain approach
The connection between both sectors can be characterised as a chain in which CSCs guide the target group towards PA facilities after referral by primary care professionals or their own recruitment. In this connection CSCs fulfilled three roles - broker, referral, and organiser – which did not change over time (Chapter 4 and 5).

Barriers at system and sector level hinder the established connection

Barriers related to the primary care (lack of time, money and knowledge) and the PA sector (lack of suitable PA activities and adequate instructors) are currently hindering the connection between both sectors (Chapter 4 and 6). Barriers related to the collaboration between both sectors, like cultural differences and different interests as identified in our literature review (Chapter 3) were not identified.

The importance of an integral approach for CSCs and the connection between both sectors
An integral approach to structural embed CSCs (Chapter 7) seemed to influence CSCs’ work and subsequently their impact. CSCs working in municipalities who structurally embedded CSCs only at the PA sector, connected both sectors mostly by jointly organising activities. CSCs working in municipalities who adopted an integral approach connected both sectors by a variety of activities targeting different audiences, and primary care professionals fulfilled mostly a role in the referral of their patients. The structural imbedding of the CSC according an integral approach seems the most promising in reaching the desired outcomes (Chapter 8).

CSC’ role is promising for establishing a connection between the primary care and the PA sector. However, to make a success of the connection changes are needed at system and sector level. Further research should focus on CSCs’ impact on stimulating PA among primary care patients, and the development of CSC’ role and the connection between both sectors over time.

Species mixing effects on forest productivity in the Netherlands
Lu, Huicui - \ 2017
University. Promotor(en): Frits Mohren, co-promotor(en): Frank Sterck. - Wageningen : Wageningen University - ISBN 9789463436397 - 134
mixed forests - temperate zones - deciduous forests - soil fertility - light - yields - netherlands - gemengde bossen - gematigde klimaatzones - loofverliezende bossen - bodemvruchtbaarheid - licht - opbrengsten - nederland

Many monoculture forests (dominated by a single tree species) have been converted to mixed-species forests (dominated by more than one tree species) in Europe over the last decades. The main reason for this conversion was to increase productivity, including timber production, and enhance other ecosystem services, such as conservation of biodiversity and other nature values. In addition, it has been suggested that mixed-species forests are more resistant, resilient and stable to disturbances.

In line with the niche complementarity hypothesis, inter-specific differences in crown architecture, leaf phenology, shade tolerance and root distribution may allow tree species to partition resources in mixed forests. Such mechanisms may lead to a higher productivity of mixed forests versus monoculture forests, a phenomenon often referred to as overyielding. Interestingly, the stress-gradient hypothesis and the resource-ratio hypothesis suggests that such inter-specific interactions vary along a soil fertility gradient, but in different ways. The stress-gradient hypothesis emphasizes that more efficient partitioning increases overyielding at low fertility soils, whereas the resource ratio hypothesis considers that the denser packing of crowns on fertile soils allows for partitioning of light and overyielding on high fertility soils. Several studies have been carried out about species mixing effects on forest productivity, but so far their findings are ambiguous. Probably, this ambiguity comes from the sites that they studied, which differ in species, age, management history, and/or environmental conditions.

This thesis analyses the mixing effect on productivity in relation to the combination of species, stand age and soil fertility, and discusses possible consequences of forest management, for five two-species mixtures in the Netherlands: Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)beech (Fagus sylvatica L.), pine (Pinus sylvestris L.)oak (Quercus robur L.), oakbeech, oakbirch (Betula pendula Roth) and pinebirch. These mixtures and their corresponding monoculture stands were studied using long-term permanent forest plots over multiple decades, but also using two inventories (around 2003 and 2013) across the entire Netherlands. These forest plots data were used together with empirical models at total stand level (chapter 2), species level (chapter 3) and tree level (chapter 4) to evaluate the mixing effect on forest productivity.

In chapter 2, four two-species mixtures and their corresponding monospecific stands were compared for productivity (volume stem wood in m3 ha-1 year-1). It was explored whether mixing species differing in leaf phenology and shade tolerance would lead to overyielding of mixed forest stands, and whether overyielding changes with stand development. In line with the niche complementarity hypothesis, the two evergreen–deciduous species mixtures (Douglas-fir–beech and pine–oak) showed overyielding whereas deciduous–deciduous species mixtures (oakbeech and oakbirch) did not. The overyielding was strongest for the Douglas-fir–beech mixture than the pine–oak mixture, which can be attributed to the greater difference in shade tolerance in the former mixture. Overyielding did not significantly change with stand development. It is argued that the regular thinning maintained the ability of species to partition resources, i.e. the complementary resource use in those mixed stands over all stand ages.

In chapter 3, it was analysed which of the two species in these four mixtures contributed to overyielding, and whether this overyielding changed along a soil fertility gradient. It was discovered that both the fast-growing and the slow-growing species could contribute to overyielding. Yet, it was mainly the fast-growing Douglas-fir that contributed to higher productivity in the Douglas-fir–beech mixtures, and the slow-growing oak that did so in the pine–oak mixtures. For both mixtures, the greatest relative productivity gain was achieved by mixtures on the poorer soils. At first sight, these results seem in line with the stress-gradient hypothesis and not the resource-ratio hypothesis. Yet, it was argued that not only complementary use of soil resources, but also use of light, may contribute to the higher productivity of mixed stands on the poorer soils.

In chapter 4, it was assessed how the growth of individual trees in mixtures was influenced by inter- and intra-specific competition, and whether this competition was mainly size-symmetric for soil resources or size-asymmetric for light on soils differing in fertility. This chapter focussed on three mixtures, i.e. oak–birch, pine–oak and pine–birch, which were available at sufficient numbers in the Dutch national forest inventory data. It was concluded that intra-specific competition was not necessarily stronger than inter-specific competition and this competitive reduction was less seen at lower soil fertility and dependent on species mixtures, which is not in line with the stress-gradient hypothesis. Moreover, size-asymmetric competition for light was more associated with tree basal area growth than size-symmetric competition for soil resources, suggesting that light is the most limiting resource. Competition for light was generally much stronger at high fertility soils, supporting the resource-ratio hypothesis. These results suggest that light is the most limiting resource for tree basal area growth and that reduced competition for light can be explained to some degree by complementarity in light use to increase tree growth in mixed forests.

This thesis thus described the productivity patterns when mixing tree species and explored possible mechanisms of higher productivity in mixed stands compared with monoculture stands in the Netherlands. Complementary use of aboveground and belowground resources probably contributes to the higher productivity in mixed stands, but other factors including pathogens, nutrient cycling and litter decomposition were not addressed but cannot be excluded. Overyielding in Douglas-fir–beech and pine–oak mixtures was maintained over time, probably owing to the intensive thinning in Dutch forests. The results shed new light on the stress-gradient and resource-ratio hypotheses. For mixtures in Dutch forest, the greatest productivity gain in Douglas-fir–beech and pine–oak mixtures was achieved on the poorer soils, and it was argued that this is at least partially driven by complementary use of light, while the role of complementarity in use of soil resources is more obscure. Overall, this thesis suggest a substantial potential of species mixing for increasing productivity, which may run in parallel with enhancing other ecosystem services such as conservation of diversity and other nature values. Yet, more experimental studies on productivity in mixed stands are required to better unravel alternative mechanisms. Such understanding is required to manage the forests effectively in a century of unpreceded human driven changes in environmental conditions.

Weidevogelscenario’s : Mogelijkheden voor aanpak van verbetering van de weidevogelstand in Nederland
Melman, Dick ; Sierdsema, Henk - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2769) - 29
weidevogels - graslanden - populatiebiologie - landschapsbeheer - kosten - habitats - natuurbescherming - nederland - grassland birds - grasslands - population biology - landscape management - costs - nature conservation - netherlands
Seals in motion : how movements drive population development of harbour seals and grey seals in the North Sea
Brasseur, Sophie Marie Jacqueline Michelle - \ 2017
University. Promotor(en): Peter Reijnders, co-promotor(en): Geert Aarts. - Wageningen : Wageningen University - ISBN 9789463436120 - 176
seals - phoca vitulina - halichoerus grypus - pinnipedia - population biology - animal ecology - wadden sea - netherlands - zeehonden - populatiebiologie - dierecologie - waddenzee - nederland
The harbour seal Phoca vitulina and the grey seal Halichoerus grypus have been inhabitants of the Wadden Sea since millennia. Prehistoric findings indicate the presence of both species around 5000 BC. This changed dramatically in the mid Middle-Ages as around 1500 AC, the grey seal disappeared from the Wadden Sea as a consequence of persecution. With growing hunting pressure, especially in the 20th century and concurrent habitat destruction and pollution, the harbour seals reached all time low numbers in the 1970’s. Banning the hunt in countries around the southern North Sea, limiting pollution and protection from disturbance allowed the harbour seals to slowly recover and the grey seals to return to the Wadden Sea. In this thesis the population trends and inherent dynamics of the recovery for both species is described. Also the movements of individual animals are studied to explain possible mechanisms.
Postmortaal onderzoek van bruinvissen (Phocoena phocoena) uit Nederlandse wateren, 2016
IJsseldijk, L.L. ; Kik, M.J.L. ; Solé, L. ; Gröne, A. - \ 2017
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 96) - 41
phocoena - postmortale onderzoeken - kustgebieden - phocoenidae - nederland - postmortem examinations - coastal areas - netherlands
This annual report presents the results of post-mortem examinations of porpoises stranded on the Dutchcoast. One of the main objectives of the research is to quantify human-induced causes of death. In 2016, 55dead harbour porpoises were examined: 31 males and 24 females, including 14 adults, 33 juveniles and 8neonates. Most of the harbour porpoises examined died as a result of grey seal attacks (31%), infectiousdiseases (29%) or food shortage (18%). Bycatch was the cause of death in 11% of the harbour porpoisesexamined
Beschermde gebiedenregister : technische documentatie, Status A
Schuiling, C. ; Schmidt, A.M. ; Rivière, I.J. la; Smidt, R.A. - \ 2017
Wageningen : Statutory Research Tasks Unit for Nature & the Environment (WOt-technical report 93) - 55
beschermde gebieden - beschermingsgebieden - natura 2000 - natuurbescherming - nederland - geodata - reserved areas - conservation areas - nature conservation - netherlands
This report offers a description of the technical environment, tools and models that are used in managing theDutch register of protected sites (Beschermde gebiedenregister). Its purpose is to document the processesand procedures. Obtaining the ‘A’ quality status is not the immediate aim, but is the long-term goal to whichthis report contributes. The aim of the register of protected sites is to define the boundaries of natural areasand to support the process of defining legally protected sites under one of the following treaties or laws: theBirds and Habitats Directives (Natura 2000), the Ramsar Convention and the Dutch Nature Protection Act(Natuurbeschermingswet). This report describes the procedures for defining the boundaries and formanaging the historical boundaries
Doorontwikkeling van de precisielandbouw in Nederland : een 360 graden-verkenning van de stand van zaken rond informatie-intensieve landbouw en in het bijzonder de plantaardige, openluchtteelt
Wal, T. van der; Vullings, L.A.E. ; Zaneveld-Reijnders, J. ; Bink, R.J. - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2820) - 89
precisielandbouw - landbouw - akkerbouw - drones - winsten - duurzaamheid (sustainability) - wetgeving - nederland - precision agriculture - agriculture - arable farming - profits - sustainability - legislation - netherlands
Flat oysters on offshore wind farms : opportunities for the development of flat oyster populations on existing and planned wind farms in the Dutch section of the North Sea
Smaal, Aad ; Kamermans, Pauline ; Kleissen, Frank ; Duren, Luca van; Have, Tom van der - \ 2017
Yerseke : Wageningen Marine Research (Wageningen Marine Research report C052/17) - 53
oyster culture - wind farms - offshore - shellfish culture - north sea - netherlands - oesterteelt - windmolenpark - schaal- en schelpdierenteelt - noordzee - nederland
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