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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The Perfect Match: Simultaneous Strawberry Pollination and Bio-Sampling of the Plant Pathogenic Bacterium Erwinia pyrifoliae by Honey Bees Apis mellifera
Steen, Sjef van der; Bergsma-Vlami, M. ; Wenneker, M. - \ 2018
Sustainable Agriculture Research 7 (2018)1. - ISSN 1927-050X - p. 25 - 32.
In this study we show that honey bee colonies placed in a greenhouse for pollination of strawberry can simultaneously be used to indicate the presence of the plant pathogenic bacterium Erwinia pyrifoliae. This was demonstrated by using two methods of qualitative sacrificial and non-sacrificial bio sampling of the honey bee colony. A novel method for non-sacrificial subsampling, named the Beehold device, was applied. Applying the Beehold device did not disturb or affect negatively the honey bee colony. The study demonstrated that the integration of pollination service and bio-sampling functioned. In the sacrificially derived honey bee subsamples, E. pyrifoliae was detected prior to any visible infection in the plant; however, E. pyrifoliae was detected via non-sacrificial sampling at the same time as plant infection was first observed. The Beehold device is a practical tool for monitoring plant pathogens via forager bees during flowering until fruit onset, but is not as sensitive as directly sampling honey bees.
Lagere overleving bijenvolken tijdens afgelopen winter
Steen, Sjef van der - \ 2017
Nationaal programma Honing 2017 - 2019 : Bijenhouderij met toekomst: naar weerbare bijen en minder bijensterfte
Dooremalen, J.A. van; Blacquiere, T. ; Cornelissen, A.C.M. ; Steen, J.J.M. van der - \ 2017
Wageningen : Wageningen University & Research
Report Honeybee Surveillance Program the Netherlands 2016 - 2017
Biesmeijer, Koos ; Steen, J.J.M. van der - \ 2017
Leiden : Naturalis - 50 p.
Varroabestrijding op stand
Steen, Sjef van der - \ 2017
BO-43-011.03-002
College Nationaal honingprogramma 2017-2019
Minder stenen in de stad kan levens redden
Lenzholzer, Sanda - \ 2017

Op plekken in steden waar veel verharding is, zoals steen, ontstaan in warme periodes hitteplekken. Door te zorgen voor meer groen, kun je in steden levens redden.

Epidemiology of Erwinia pyrifoliae, a new pathogen on strawberry in the Netherlands
Wenneker, M. ; Bergsma-Vlami, M. ; Steen, J.J.M. van der - \ 2017
In: 8th International Strawberry Symposium. - International Society for Horticultural Science (Acta Horticulturae ) - ISBN 9789462611528 - p. 721 - 726.
Bacterial disease - Fire blight - Honeybees

During the late spring of 2013 strawberry plants (Fragaria × ananassa Duch. 'Elsanta') were showing an intense blackening of their immature fruits, their fruit calyxes and the peduncule were found at several locations (greenhouses) in The Netherlands. Symptoms include brown petals, green young fruits turning brown, malformed fruits and bacterium slime (ooze) formation on the surface of the young fruits. Fruits did not develop or were in many cases heavily malformed. In certain cases 40% of the crop was lost. Isolations from these symptomatic immature strawberry fruits yielded Erwinia-like colonies on YPG (yeast peptone glucose) agar. The isolates differed biochemically from E. amylovora and they were closely related to biochemical profiles of the Erwinia pyrifoliae reference strain LMG 25888. The isolates were further identified as E. pyrifoliae based on the real time PCR assay. Pathogenicity of several isolates was tested and confirmed on potted strawberry plants ('Elsanta' and 'Selva'). Honeybees from pollinating colonies were tested to detect E. pyrifoliae in a flowering strawberry greenhouse cultivation. Host range, mechanisms of survival and spread of this new Erwinia species on strawberry will be discussed.

Three years of banning neonicotinoid insecticides based on sub-lethal effects : Can we expect to see effects on bees?
Blacquière, Tjeerd ; Steen, Sjef van der - \ 2017
Pest Management Science 73 (2017)7. - ISSN 1526-498X - p. 1299 - 1304.
Exposure and dose - Honey bees - Neonicotinoids - Pesticide ban - Pollinator declines
The 2013 EU ban of three neonicotinoids used in seed coating of pollinator attractive crops was put in place because of concern about declining wild pollinator populations and numbers of honeybee colonies. It was also concluded that there is an urgent need for good field data to fill knowledge gaps. In the meantime such data have been generated. Based on recent literature we question the existence of recent pollinator declines and their possible link with the use of neonicotinoids. Because of temporal non-coincidence we conclude that declines of wild pollinators and of honeybees are not likely caused by neonicotinoids. Even if bee decline does occur and if there is a causal relationship with the use of neonicotinoids, we argue that it is not possible on such short term to evaluate the effects of the 2013 ban. In order to supply future debate with realistic (field) data and to discourage extrapolating the effects of studies using overdoses that are not of environmental relevance, we propose - in addition to field studies performed by the chemical industry - to use the 'semi-field worst case' treated artificial diet studies approach to free flying colonies in the field. This kind of study may provide realistic estimates for risk and be useful to study realistic interactions with non-pesticide stressors.
Lage sterfte van Nederlandse honingbijenvolken deze winter: 6,5%
Steen, Sjef van der; Toussaint, Erik - \ 2016
De volgende stap : Sturen met maatschappelijke energie in het natuurdomein
Boonstra, F.G. ; Steen van der, Marijn ; Arnouts, R.C.M. ; Scherpenisse, Jorren ; Jong, Ilsa de - \ 2016
Den Haag : NSoB Nederlandse School voor Openbaar Bestuur - ISBN 9789075297546 - 64 p.
Gebruiker samenvatting en leeswijzer van “Report Honeybee Surveillance Program the Netherlands, 2015 – 2016”
Steen, J.J.M. van der; Knoben, Nieke ; Biesmeijer, K. - \ 2016
Wageningen : Bijen@wur - 3 p.
Report Honeybee Surveillance Program the Netherlands
Biesmeijer, Koos ; Steen, J.J.M. van der - \ 2016
Leiden : Naturalis - 35 p.
Het Vlaams Imkercongres 2016
Steen, J.J.M. van der - \ 2016
Bijenhouden 10 (2016)8. - ISSN 1877-9786 - p. 23 - 24.
Active citizenship for urban green infrastructure : fostering the diversity and dynamics of citizen contributions through mosaic governance
Buijs, Arjen E. ; Mattijssen, Thomas J.M. ; Jagt, Alexander P.N. van der; Ambrose-Oji, Bianca ; Andersson, Erik ; Elands, Birgit H.M. ; Steen Møller, Maja - \ 2016
Current Opinion in Environmental Sustainability 22 (2016). - ISSN 1877-3435 - p. 1 - 6.

Active citizens may contribute to the environmental, social, and institutional resilience of cities. This review discusses how citizen initiatives protect biodiversity hotspots, contribute to social cohesion, institutional innovation, and diversity in urban green space management. Challenges related to social inclusiveness, ecological connectivity and continuity suggest government involvement is pertinent, but needs to be refocused. To maximise environmental outcomes of active citizenship, governments may adopt an enabling and stimulating governance style that harnesses the transformative potential of active citizenship. This paper argues for mosaic governance to work with the heterogeneous array of people, institutions, and spatial practices associated with active citizenship. Mosaic governance aims for a context-sensitive way of urban green infrastructure planning, enhancing relationships between the diversity of landscapes and communities across cities.

Epidemiology of Erwinia pyrifoliae, a new pathogen on strawberry in the Netherlands
Wenneker, M. ; Bergsma-Vlami, M. ; Steen, J.J.M. van der - \ 2016
In: Book of abstracts, 8th International Strawberry Symposium International Society for Horticultural Science - p. 73 - 73.
Honeybee colonies for crop pollination and bio-sampling of plant pathogens : Early detection of Erwinia pyrifoliae in strawberry with the honeybee colony
Steen, Sjef van der; Bergsma-Vlami, M. ; Kogel, W.J. de; Wenneker, M. - \ 2016
Rebalancing food production and nature conservation; the need for design-oriented research
Rossing, W.A.H. ; Sabatier, R. ; Teillard, F. ; Groot, J.C.J. ; Tittonell, P.A. - \ 2016
In: Food production and nature conservation. Conflicts and Solutions / Gordon, Iain J., Squire, Geoff R., Prins, Herbert H.T., Earthscan - ISBN 9781138859395 - p. 261 - 280.
The unprecedented impacts of humans on the Earth (e.g. Rockström et al., 2009; Sachs et al., 2010; Foley, 2011) have prompted a debate on the future of land use and, with agriculture as the major anthropogenic use, on new models of agricultural production. In addition to concerns about the eects of current agricultural land use, the debate is fuelled by the predicted growth of the human population, at least until 2050, and the associated need to nourish an extra 3 billion people in the face of a limited unused area of agriculturally exploitable land (e.g. Godfray et al., 2010). Leadley et al. (2014) predict rapid shifts in the state of ecosystems at regional scales within the next decades that it will be dicult to reverse. Assuming business-as-usual socioeconomic development pathways, these shifts will drive coupled human-environment systems to highly degraded states in terms of biodiversity, ecosystem services, and human well-being. Steen et al. (2015) describe how planetary boundaries that delimit a ‘safe space’ for global societal development have been exceeded in the domains of climate change and land-system change and are reaching well into high-risk zones for biosphere integrity (operationalized as genetic diversity) and biogeochemical ows of P and N. For various indicators, it is not the absolute global levels that are a cause for concern, but the speed at which current levels are being reached, which is unprecedented in the Anthropocene (Kidwell, 2015).
Participatory governance of urban green spaces: Trends and practices in the EU
Jagt, Alexander van der; Elands, B.H.M. ; Ambrose-Oji, Bianca ; Gerőházi, E. ; Steen Moller, Maja ; Buizer, I.M. - \ 2016
Nordic Journal of Architectural Research 28 (2016)3. - ISSN 1893-5281 - p. 11 - 40.
Green spaces provide a variety of benefits that contribute to more
healthy and attractive cities. This paper, building upon results of the EU
FP7 GREEN SURGE project, aims to identify, describe and categorize innovative
participatory governance practices characterized by non-governmental
actor involvement in the maintenance, decision-making or management
of urban green spaces. A total of 20 cities in 14 EU-countries were
studied and for each of these, information on participatory governance
arrangements was acquired using a multi-method approach. This was a
combination of: a) semi-structured interviews with green space planning
city officials, b) desk studies, and c) analysis of planning documents with
relevance to urban green space. We identified four broad trends influencing
participatory governance policies and practices in the EU, and we
categorized participatory governance practices relating to urban green
spaces into seven clusters. To capture and compare between different
cities and countries the different ways in which non-governmental actors
are involved in urban green space governance, we introduced a participatory
governance matrix. The matrix has two dimensions: “mode of
governance” (ranging from government regulation to self-governance)
and “means of participation” (ranging from more structural institutional
influence to influence through hands-on activities). By considering participatory
governance practices along with trends at a European level,
practitioners are provided with an improved understanding of how to
harness the potential of civil society in urban green space management,
now and into the future.
An energetics-based honeybee nectarforaging model used to assess the potential for landscape-level pesticide exposure dilution
Baveco, J.M. ; Focks, A. ; Belgers, J.D.M. ; Steen, J.J.M. van der; Boesten, J.J.T.I. ; Roessink, I. - \ 2016
PeerJ 4 (2016). - ISSN 2167-8359 - 25 p.
Estimating the exposure of honeybees to pesticides on a landscape scale requires models of their spatial foraging behaviour. For this purpose, we developed a mechanistic, energetics-based model for a single day of nectar foraging in complex landscape mosaics. Net energetic efficiency determined resource patch choice. In one version of the model a single optimal patch was selected each hour. In another version, recruitment of foragers was simulated and several patches could be exploited simultaneously. Resource availability changed during the day due to depletion and/or intrinsic properties of the resource (anthesis). The model accounted for the impact of patch distance and size, resource depletion and replenishment, competition with other nectar foragers, and seasonal and diurnal patterns in availability of nectar-providing crops and wild flowers. From the model we derived simple rules for resource patch selection, e.g., for landscapes with mass-flowering crops only, net energetic efficiency would be proportional to the ratio of the energetic content of the nectar divided by distance to the hive. We also determined maximum distances at which resources like oilseed rape and clover were still energetically attractive. We used the model to assess the potential for pesticide exposure dilution in landscapes of different composition and complexity. Dilution means a lower concentration in nectar arriving at the hive compared to the concentration in nectar at a treated field and can result from foraging effort being diverted away from treated fields. Applying the model for all possible hive locations over a large area, distributions of dilution factors were obtained that were characterised by their 90-percentile value. For an area for which detailed spatial data on crops and off-field semi-natural habitats were available, we tested three landscape management scenarios that were expected to lead to exposure dilution: providing alternative resources than the target crop (oilseed rape) in the form of (i) other untreated crop fields, (ii) flower strips of different widths at field edges (off-crop in-field resources), and (iii) resources on off-field (semi-natural) habitats. For both model versions, significant dilution occurred only when alternative resource patches were equal or more attractive than oilseed rape, nearby and numerous and only in case of flower strips and off-field habitats. On an area-base, flower strips were more than one order of magnitude more effective than off-field habitats, the main reason being that flower strips had an optimal location. The two model versions differed in the predicted number of resource patches exploited over the day, but mainly in landscapes with numerous small resource patches. In landscapes consisting of few large resource patches (crop fields) both versions predicted the use of a small number of patches.
Think regionally, act locally : metals in honeybee workers in the Netherlands (surveillance study 2008)
Steen, J.J.M. van der; Cornelissen, B. ; Blacquière, T. ; Pijnenburg, J.E.M.L. ; Severijnen, M. - \ 2016
Environmental Monitoring and Assessment 188 (2016)8. - ISSN 0167-6369
Apis mellifera - Bioindication - Heavy metals - Honeybee - Land use - Region - Surveillance study

In June 2008, a surveillance study for metals in honeybees was performed in the Netherlands. Randomly, 150 apiaries were selected. In each apiary, five colonies were sampled. Per apiary, the hive samples were pooled. The apiary sample was analysed for Al, As, Ba, Cd, Co, Cr, Cu, Li, Mn, Mo, Ni, Sb, Se, Sn, Sr, Ti, V and Zn. All metals could be detected in all apiaries. As, Li, Sb, Sn and V were detected in part of the apiaries. The overall picture showed a regional pattern. In apiaries in the east of the Netherlands, Al, Ba, Cr, Mn, Mo, Ni, Se and Ti are found in higher concentrations compared to the west. In-region variation was demonstrated, indicating local effects. The vicinity of the apiaries was mapped afterwards and characterised as land uses of >50 % agricultural area, >50 % wooded area, >50 % urban area and mixed land use within a circle of 28 km2 around the apiary. The results indicated that in apiaries located in >50 % wooded areas, significantly higher concentrations of Al, Ba, Cd, Cr, Cu, Li, Mn, Mo, Ni, Sb, Sr, Ti and Zn were found compared to agricultural, urban and mixed land use areas. We conclude that (1) the ratio between metal concentrations varies per region, demonstrating spatial differences, and (2) there is in-region local variation per metal. The results indicate the impact of land use on metal concentrations in honeybees. For qualitative bioindication studies, regional, local and land use effects should be taken into account.

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