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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    Toelaatbaarheid nieuwe vormen van lijkbezorging
    Nijhuis, J.G. ; Koeman, N.S.J. ; Kompanje, E.J.O. ; Mathijssen, B.M.H.P. ; Pijl, Y.H. van der; Wisselink, H.J. ; Zeeman, G. - \ 2020
    Differential responses to salt stress in ion dynamics, growth and seed yield of European quinoa varieties
    Jaramillo Roman, Viviana ; Toom, Leonardus A. den; Castro Gamiz, Carlos ; Pijl, Niels van der; Visser, Richard G.F. ; Loo, Eibertus N. van; Linden, Gerard van der - \ 2020
    Environmental and Experimental Botany 177 (2020). - ISSN 0098-8472
    Chenopodium quinoa - Naexclusion - RGR - Salt stress tolerance - Survival and growth

    Quinoa is a nutritious seed crop with a great potential to grow in saline soils. Here, we studied ion concentrations in quinoa tissues throughout the life cycle of the plant, and linked ion dynamics to responses in growth parameters, seed yield and efficiency of photosynthesis under salinity (0–400 mM NaCl). Ion dynamics changed from high ion exclusion (>99 %, root contents lower than root medium and low accumulation of ions in the leaves) before flowering, to a build-up of ions during seed filling. This indicates a change in strategy in maintaining the necessary gradient of water potential from the root medium to the leaves. K+ concentrations in leaves also increased by more than 100 % in response to prolonged severe salt stress, which may point to a role of this ion in leaf osmotic adjustment. Accumulation of ions in epidermal bladder cells did not contribute substantially to Na+-exclusion as it was less than 6 % of the total Na+ taken up in leaves. Growth under salt stress was mostly impaired by anatomical adaptations (reduced SLA), while initial light use efficiency (Fv/Fm) and NAR were not affected. The variety Pasto showed a “survival strategy” to high salinity with higher ion exclusion and a higher reduction in transpiration than the other varieties, at the expense of lower biomass and seed yield.

    GIS-based soil erosion modelling under various steep-slope vineyard practices
    Pijl, Anton ; Reuter, Lara E.H. ; Quarella, Edoardo ; Vogel, Teun A. ; Tarolli, Paolo - \ 2020
    Catena 193 (2020). - ISSN 0341-8162
    High-resolution topography - RUSLE - SIMWE - Soil erosion modeling - Steep-slope agriculture - Vineyard terraces

    Soil erosion can cause a progressive degradation of hillslopes, especially in steep-slope agricultural landscapes. In this study, the formation of spatial erosion patterns was evaluated in three typical steep-slope vineyard cultivation practices in northern Italy: dry-stone wall terraces, earth bank terraces and vertical cultivation (Italian: rittochino). UAV surveys in three vineyards provided high-resolution data on topography and land use serving as input for two GIS-based erosion models: the Revised Universal Soil Loss Equation (RUSLE) and SIMulated Water Erosion model (SIMWE). Annual RUSLE simulations showed how the two terracing practices (i.e. dry-stone walls and earth banks) effectively safeguarded large areas from soil loss, whereas the non-terraced vertical cultivation produced widely distributed soil loss with increasing severity according to slope length and steepness. In intense single-event conditions simulated by SIMWE, all three practices showed the formation of critical preferential surface flow patterns, corresponding to several field-observed erosion patterns (piping of stone walls, landslides on earth banks, and rill erosion in the non-terraced vineyard), while also in this case showing the highest erosion rates for the non-terraced vertical cultivation. Simulated flow concentration was strongly determined by the spatial organisation of the hillslope, roads and vines, and several strategies were discussed for erosion mitigation (including drainage systems or enhanced soil cover). Furthermore, the results indicated that SIMWE is an optimal approach for the recognition of soil erosion processes occurring during intense rainfall conditions. This study provides an example of high-resolution erosion risk evaluation, which should play a crucial role in the design and management of steep-slope vineyards.

    Exploration of tissue-specific gene expression patterns underlying timing of breeding in contrasting temperature environments in a song bird
    Laine, Veronika N. ; Verhagen, Irene ; Mateman, A.C. ; Pijl, Agata ; Williams, Tony D. ; Gienapp, Phillip ; Oers, Kees van; Visser, Marcel E. - \ 2019
    BMC Genomics 20 (2019). - ISSN 1471-2164
    Aves - Seasonal timing - Selection line - Transcriptomics

    Background: Seasonal timing of breeding is a life history trait with major fitness consequences but the genetic basis of the physiological mechanism underlying it, and how gene expression is affected by date and temperature, is not well known. In order to study this, we measured patterns of gene expression over different time points in three different tissues of the hypothalamic-pituitary-gonadal-liver axis, and investigated specifically how temperature affects this axis during breeding. We studied female great tits (Parus major) from lines artificially selected for early and late timing of breeding that were housed in two contrasting temperature environments in climate-controlled aviaries. We collected hypothalamus, liver and ovary samples at three different time points (before and after onset of egg-laying). For each tissue, we sequenced whole transcriptomes of 12 pools (n = 3 females) to analyse gene expression. Results: Birds from the selection lines differed in expression especially for one gene with clear reproductive functions, zona pellucida glycoprotein 4 (ZP4), which has also been shown to be under selection in these lines. Genes were differentially expressed at different time points in all tissues and most of the differentially expressed genes between the two temperature treatments were found in the liver. We identified a set of hub genes from all the tissues which showed high association to hormonal functions, suggesting that they have a core function in timing of breeding. We also found ample differentially expressed genes with largely unknown functions in birds. Conclusions: We found differentially expressed genes associated with selection line and temperature treatment. Interestingly, the latter mainly in the liver suggesting that temperature effects on egg-laying date may happen down-stream in the physiological pathway. These findings, as well as our datasets, will further the knowledge of the mechanisms of tissue-specific avian seasonality in the future.

    Fine-tuning of seasonal timing of breeding is regulated downstream in the underlying neuro-endocrine system in a small songbird
    Verhagen, Irene ; Laine, Veronika N. ; Mateman, A.C. ; Pijl, Agata ; Wit, Ruben de; Lith, Bart van; Kamphuis, Willem ; Viitaniemi, Heidi M. ; Williams, Tony D. ; Caro, Samuel P. ; Meddle, Simone L. ; Gienapp, Phillip ; Oers, Kees van; Visser, Marcel E. - \ 2019
    Journal of Experimental Biology 222 (2019)17. - ISSN 0022-0949
    Gene expression - Individual variation - Parus major - QPCR - Reproductive timing

    The timing of breeding is under selection in wild populations as a result of climate change, and understanding the underlying physiological processes mediating this timing provides insight into the potential rate of adaptation. Current knowledge on this variation in physiology is, however, mostly limited to males. We assessed whether individual differences in the timing of breeding in females are reflected in differences in candidate gene expression and, if so, whether these differences occur in the upstream (hypothalamus) or downstream (ovary and liver) parts of the neuroendocrine system. We used 72 female great tits from two generations of lines artificially selected for early and late egg laying, which were housed in climate-controlled aviaries and went through two breeding cycles within 1 year. In the first breeding season we obtained individual egg-laying dates, while in the second breeding season, using the same individuals, we sampled several tissues at three time points based on the timing of the first breeding attempt. For each tissue, mRNA expression levels were measured using qPCR for a set of candidate genes associated with the timing of reproduction and subsequently analysed for differences between generations, time points and individual timing of breeding. We found differences in gene expression between generations in all tissues, with the most pronounced differences in the hypothalamus. Differences between time points, and early- and late-laying females, were found exclusively in the ovary and liver. Altogether, we show that fine-tuning of the seasonal timing of breeding, and thereby the opportunity for adaptation in the neuroendocrine system, is regulated mostly downstream in the neuro-endocrine system.

    Impact of mechanisation on soil loss in terraced vineyard landscapes
    Pijl, A. ; Barneveld, P. ; Mauri, L. ; Borsato, E. ; Grigolato, S. ; Tarolli, P. - \ 2019
    Cuadernos de Investigacion Geografica 45 (2019)1. - ISSN 0211-6820 - p. 287 - 308.
    Compaction - Erosion - Mechanization - Northeastern Italy - RUSLE - Vineyard terraces

    Soil loss poses a threat to hilly and mountainous areas, particularly where local economies strongly depend on agricultural production. Among agricultural landscapes, vineyards are responsible for the highest erosion rates, particularly in steep-slope landscapes. The impact of vineyard mechanisation on soil loss is only marginally explored in published literature. This study provides an estimation of the annual soil loss rate by application of the Revised Universal Soil Loss Equation (RUSLE) in 24 terraced vineyards located in north-eastern Italy. Field observations showed that 13 vineyards consisted of fully mechanised fields, 5 vineyards had no form of mechanisation, while in 6 vineyards a mixture of practices was found. Soil erodibility (K factor) was derived for these practices (based on soil characteristics and varying degrees of compaction), while slope length and steepness (LS factors) were calculated from a 1-m LiDAR-based DTM, and remaining factors were based on datasets by the European Soil Data Centre. Mechanised fields showed 29% higher erosion rates than non-mechanised fields (respectively 53.9 and 69.5 t ha-1 y-1), although this is not statistically significant. Still, the direct impact of mechanisation is underestimated in this comparison, due to the predominant steep slopes in the manually cultivated fields. Furthermore, estimated soil loss from mechanised fields in addition to mechanised paths and roads is significantly higher by 37% than non-mechanised fields. This study thus offers an indication of how machinery and related soil compaction and transformation of terraces and infrastructure, increases soil loss risk.

    Hydrologic impacts of changing land use and climate in the Veneto lowlands of Italy
    Pijl, Anton ; Brauer, Claudia C. ; Sofia, Giulia ; Teuling, Adriaan J. ; Tarolli, Paolo - \ 2018
    Anthropocene 22 (2018). - ISSN 2213-3054 - p. 20 - 30.
    Climate change - Hydrologic modelling - Land use change - Lowland - Scenario analysis - Urbanisation

    The Po valley in northern Italy is one of Europe's largest and most anthropogenically-modified lowland areas, where intensifying climate and land transformation are increasingly causing water management problems. In this study, the Wageningen Lowland Runoff Simulator (WALRUS) is calibrated, validated, and applied to a reclaimed basin in the Veneto region (Italy) in order to assess the hydrologic impacts of land use and climate change scenarios. First-time model calibration for Mediterranean lowlands resulted in reasonable performance during the training year (NSE 0.77), but lower validation performance (NSE 0.53), while potential for improved calibration was limited by data availability. Scenario analysis covers the historical and future changes in land cover and climate throughout a century (1951–2060), based on aerial imagery analysis, hydrologic measurements, COSMO-CLM regional climate projections and demographics. WALRUS simulations illustrate how land use transformation (i.e. expanded built-up zones and a diminished drainage network) have a strong potential to increase discharge intensities from the catchment, mostly evident in summer peak flow (past −34%; future +48%). A historical scenario of combined land use and climate shows even stronger deviations from the present (annual discharge −19%; summer peak flow −45%), resulting from an observed increase in rainfall intensity and seasonality over the past 50 years. With drier future climate projections, however, the discharge response is moderate in the combined future scenario. Despite the non-optimal model calibration, the presented work in the Veneto region illustrates the directional impact of processes typical of anthropogenic lowlands. Particularly, the impact of observed land transformation seems to diminish the buffering and storage capacity of the catchment, thereby enhancing the hydrologic risks in modern times.

    Social Entrepreneurship for Food Security, Creating Flourishing Ecosystems enabling communities to enhance Food Security, SES4FOOD
    Coninx, I. ; Pijl, Margreet van der - \ 2018
    The 2015 Dutch food-based dietary guidelines
    Kromhout, D. ; Spaaij, C.J.K. ; Goede, J. de; Weggemans, R.M. ; Brug, Johannes ; Geleijnse, Johanna M. ; Goudoever, Johannes B. van; Hoes, Arno W. ; Hopman, Maria T.E. ; Iestra, Jolein A. ; Mensink, Ronald P. ; Pijl, Hanno ; Romijn, Johannes A. ; Schols, Annemie M.W.J. ; Seidell, Jaap C. ; Veer, Pieter van 't; Visser, Marjolein ; Zwietering, Marcel H. - \ 2016
    European Journal of Clinical Nutrition 70 (2016)8. - ISSN 0954-3007 - p. 869 - 878.

    The objective of this study was to derive food-based dietary guidelines for the Dutch population. The dietary guidelines are based on 29 systematic reviews of English language meta-analyses in PubMed summarizing randomized controlled trials and prospective cohort studies on nutrients, foods and food patterns and the risk of 10 major chronic diseases: coronary heart disease, stroke, heart failure, diabetes, breast cancer, colorectal cancer, lung cancer, chronic obstructive pulmonary disease, dementia and depression. The committee also selected three causal risk factors for cardiovascular diseases or diabetes: systolic blood pressure, low-density lipoprotein cholesterol and body weight. Findings were categorized as strong or weak evidence, inconsistent effects, too little evidence or effect unlikely for experimental and observational data separately. Next, the committee selected only findings with a strong level of evidence for deriving the guidelines. Convincing evidence was based on strong evidence from the experimental data either or not in combination with strong evidence from prospective cohort studies. Plausible evidence was based on strong evidence from prospective cohort studies only. A general guideline to eat a more plant food-based dietary pattern and limit consumption of animal-based food and 15 specific guidelines have been formulated. There are 10 new guidelines on legumes, nuts, meat, dairy produce, cereal products, fats and oils, tea, coffee and sugar-containing beverages. Three guidelines on vegetables, fruits, fish and alcoholic beverages have been sharpened, and the 2006 guideline on salt stayed the same. A separate guideline has been formulated on nutrient supplements. Completely food-based dietary guidelines can be derived in a systematic and transparent way.

    Financial value-chain analysis : tuna, shrimp, soy and beef
    Duijn, A.P. van; Beukers, R. ; Cow an, Roberta B. ; Judge, L.O. ; Pijl, W. van der; Römgens, Indra ; Scheele, Fleur ; Steinweg, Tim - \ 2016
    LEI Wageningen UR (Brochure / LEI Wageningen UR 2016-029) - 50
    supply chain management - agro-industrial chains - commodities - retail marketing - finance - tuna - shrimps - glycine (fabaceae) - beef - world - ketenmanagement - agro-industriële ketens - basisproducten - marketing voor de detailhandel - financiën - tonijn - garnalen - glycine (fabaceae) - rundvlees - wereld
    This brochure offers a detailed analysis of the financial vehicles and mechanisms that drive the expansion of production of the following four commodities: skipjack canned tuna; cultured shrimp; soy; and beef. The commodities were selected in view of their global economic importance and their potentially adverse impact on the environment. The financial sector (investors, lenders, insurers, funds, etc.) serves as a gate-keeper to capital flows that are critical in supporting companies’ expansions of operational capacity. This sector can significantly influence how these businesses exploit renewable resources. In this brochure therefore:  The supply chains for each commodity were verified by geography;  The top companies in each segment of the supply chain were identified (e.g. farmers, primary processors, etc.); and  Primary sources of financing were identified.
    Financial value-chain analysis : tuna, shrimp, soy and beef
    Duijn, A.P. van; Beukers, R. ; Cowan, Roberta B. ; Judge, L.O. ; Pijl, Willem van der; Römgens, Indra ; Scheele, Fleur ; Steinweg, Tim - \ 2016
    LEI Wageningen UR (Report / LEI Wageningen UR 2016-028) - 80
    supply chain management - agro-industrial chains - retail marketing - commodities - finance - tuna - shrimps - glycine (fabaceae) - beef - world - ketenmanagement - agro-industriële ketens - marketing voor de detailhandel - basisproducten - financiën - tonijn - garnalen - glycine (fabaceae) - rundvlees - wereld
    This study is a detailed analysis of which parts of the tuna, shrimp, soy and beef supply chains are most open to constructive engagement through financial vehicles and mechanisms. The study indentifies the largest market shares in the various supply chains. For the retail sector, the objective was to analyse the openness of the retail sector to financial influence taking into account the latest sector trends.
    The Genome of Winter Moth (Operophtera brumata) Provides a Genomic Perspective on Sexual Dimorphism and Phenology
    Derks, M.F.L. ; Smit, S. ; Salis, L. ; Schijlen, E.G.W.M. ; Bossers, A. ; Mateman, C. ; Pijl, A.S. ; Ridder, D. de; Groenen, M.A.M. ; Visser, M.E. ; Megens, H.J.W.C. - \ 2015
    Genome Biology and Evolution 7 (2015)8. - ISSN 1759-6653 - p. 2321 - 2332.
    The winter moth (Operophtera brumata) belongs to one of the most species-rich families in Lepidoptera, the Geometridae (approximately 23,000 species). This family is of great economic importance as most species are herbivorous and capable of defoliating trees. Genome assembly of the winter moth allows the study of genes and gene families, such as the cytochrome P450 gene family, which is known to be vital in plant secondary metabolite detoxification and host-plant selection. It also enables exploration of the genomic basis for female brachyptery (wing reduction), a feature of sexual dimorphism in winter moth, and for seasonal timing, a trait extensively studied in this species. Here we present a reference genome for the winter moth, the first geometrid and largest sequenced Lepidopteran genome to date (638 Mb) including a set of 16,912 predicted protein-coding genes. This allowed us to assess the dynamics of evolution on a genome-wide scale using the P450 gene family. We also identified an expanded gene family potentially linked to female brachyptery, and annotated the genes involved in the circadian clock mechanism as main candidates for involvement in seasonal timing. The genome will contribute to Lepidopteran genomic resources and comparative genomics. In addition, the genome enhances our ability to understand the genetic and molecular basis of insect seasonal timing and thereby provides a reference for future evolutionary and population studies on the winter moth.
    Capacity building for sustainable aquaculture and fisheries development in Myanmar
    Steins, N.A. ; Bosma, R.H. ; Taal, K. ; Bolman, B.C. ; Bink, E. ; Dop, H. van; Dekker, A. ; Numan, J. ; Spek, G. van der; Pijl, W. van der - \ 2015
    IJmuiden : IMARES (Report / IMARES Wageningen UR C075/15) - 44
    aquacultuur - visserij - duurzame ontwikkeling - myanmar - capaciteitsopbouw - kennisoverdracht - duurzaamheid (sustainability) - aquaculture - fisheries - sustainable development - myanmar - capacity building - knowledge transfer - sustainability
    This report presents the results of a Dutch public-private capacity building (Knowledge to Knowledge or K2K) mission for fostering sustainable aquaculture and fisheries development in Myanmar. The objectives of the K2K mission were to: 1) analyse Myanmar’s aquaculture and fisheries knowledge infrastructure including a gap analysis; 2) identify future stakeholder needs and recommend improvements in terms of capacity building; 3) provide basic practical knowledge in support of a sustainable aquaculture and fisheries sector to Myanmar stakeholders; and 4) develop a Terms of Reference for a possible future programme aiming at building capacity for a sustainable fisheries and aquaculture sector in Myanmar through Dutch knowledge infrastructure (public and private).
    Pangasius in the EU market; Prospects for the position of (ASC-certified) pangasius in the EU retail and food service sector
    Beukers, R. ; Pijl, W. van der; Duijn, A.P. van - \ 2014
    The Hague : LEI Wageningen UR/CBI - 29
    visproducten - visproductie - certificering - aquacultuur - handelsmerken - landen van de europese unie - marktverkenningen - fish products - fish production - certification - aquaculture - trade marks - european union countries - market surveys
    The objective of this market study is to investigate the potential short- and long-term benefits for investors to invest in the production of pangasius with a trademark based on ASC certification, for the retail and food service market segments in the EU market.
    An update of shrimp and prawn supply chain initiatives in Bangladesh : recommendations for inclusive shrimp supply chain development for the STDF project
    Pijl, W. van der - \ 2014
    Den Haag : LEI Wageningen UR (Report / LEI Wageningen UR 14-028) - 30
    garnalen - steurgarnalen - schaal- en schelpdierenteelt - markten - marketing - bangladesh - shrimps - prawns - shellfish culture - markets - marketing - bangladesh
    The Standards and Trade Development Facility (STDF) project implemented by FAO in cooperation with the Department of Fisheries and WorldFish is funded by WTO. It will target 1,000 shrimp and prawn farmers in Southwest Bangladesh and focuses on improving their livelihoods and securing their market access. This study focuses only on the supply chain component of the STDF project. The situation in the shrimp and prawn sector is already changing, as a result of the supply chain innovation initiatives in Bangladesh. A premium supply chain that will provide premium quality traceable products and a fair distribution of profits among stakeholders is slowly being established (see Figure 1). The improved quality and traceability of the shrimp and prawn products from Bangladesh will contribute to an improved image of these products in the international market and to improved livelihoods of small-scale farmers and other stakeholders in the sector. The premium supply chain will initially only cover a small part of supply. However, it is expected that it will gradually expand when its business case is proven.
    EU seafood policy: General system of preference (GSP)
    Rau, M.L. ; Bank, M. van der; Pijl, W. van der; Helvoirt, B. van - \ 2014
    Infofish international 2014 (2014)1. - ISSN 0127-2012 - p. 8 - 11.
    The EU Common Fishery Policy, Illegal, Unregulated and Unregistered Fishing and the EU General System of Preference
    Rau, M.L. ; Turenhout, M.N.J. ; Pijl, W. van der - \ 2013
    The Hague : Centre for the Promotion of Imports from Developing Countries (CBI), Agency of the Netherlands Ministry of Foreign Affairs (CBI Policy newsletter )
    Aquaculture business opportunities in Egypt
    Rothuis, A.J. ; Duijn, A.P. van; Roem, A.J. ; Ouwehand, A. ; Pijl, W. van der; Rurangwa, E. - \ 2013
    Wageningen : Wageningen UR (LEI report 2013-039) - 34
    aquacultuur - voedselproductie - voedselzekerheid - plattelandsontwikkeling - bedrijfseconomie - handelsrelaties - egypte - overheidsbeleid - nederland - aquaculture - food production - food security - rural development - business economics - trade relations - egypt - government policy - netherlands
    Egyptian fish farming has witnessed a spectacular development resulting in an industry that is number 7 worldwide and number 2 in tilapia production. As such the industry is an important contributor to Egypt's economy as well as a major provider of cheap fish protein. However there are a number of developments that potentially could result in a stagnation or even collapse of the industry.
    Myanmar seafood exports:Quick scan of the EU market potential
    Pijl, W. van der; Duijn, A.P. van - \ 2012
    The Hague : CBI (Centre for the Promotion of Imports from developing countries) - 28
    visproducten - kweekvis - visteelt - zeevruchten - markten - myanmar - europa - fish products - farmed fish - fish culture - seafoods - markets - myanmar - europe
    The Asian region is a major supplier of fish products to the European market. The aquaculture sector in a number of Asian countries has become an important producer as well as exporter of various captured and cultured seafood products. Since Myanmar is in a transition to democracy and the EU decided to remove most sanctions to fuel economic development, Myanmar is very interesting for the European seafood industry. The Dutch Centre for the Promotion of Import from Developing Countries (CBI) and LEI Wageningen UR decided to conduct this quick scan to analyse the EU market potential of the seafood sector in Myanmar.
    Pakistan seafood exports: Quick scan of the EU market potential
    Pijl, W. van der; Duijn, A.P. van - \ 2012
    The Hague : LEI, part of Wageningen UR (LEI-report ) - 24
    visserij - aquacultuur - zeevruchten - visproducten - export - pakistan - fisheries - aquaculture - seafoods - fish products - exports - pakistan
    The Asian region is a major supplier of fish products to the EU market. The aquaculture sector in some Asian countries has become an important producer as well as exporter of white fish and shrimp, especially during the past five years. Within the Asian region CBI is currently developing an integrated programme for the seafood sector. For the development of this programme, a good understanding of the supply and de-mand side of the industry is necessary. In order to investigate whether it is advisable for CBI to invest in a programme to support further export growth of the seafood sectors of Pakistan and Sri Lanka, additional research is needed.
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