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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Data from: Effects of landscape complexity on pollinators are moderated by pollinators' association with mass-flowering crops
Fijen, T.P.M. ; Scheper, J.A. ; Boekelo, Bastiaen ; Raemakers, Ivo ; Kleijn, D. - \ 2019
local pollinator species pool - crop pollinator species pool - landscape complexity - dominant crop pollinators - opportunistic crop pollinators - non-crop pollinators
Conserving and restoring semi-natural habitat, i.e. enhancing landscape complexity, is one of the main strategies to mitigate pollinator decline in agricultural landscapes. However, we still have limited understanding of how landscape complexity shapes pollinator communities in both crop and non-crop habitat, and whether pollinator responses to landscape complexity vary with their association with mass-flowering crops. Here, we surveyed pollinator communities on mass-flowering leek crops and in nearby semi-natural habitat in landscapes of varying complexity. Surveys were done before and during crop bloom and distinguished between pollinators that visit the crop frequently (dominant), occasionally (opportunistic), or not at all (non-crop). Forty-seven per cent of the species in the wider landscape were also observed on leek flowers. Crop pollinator richness increased with local pollinator community size and increasing landscape complexity, but relationships were stronger for opportunistic than for dominant crop pollinators. Relationships between pollinator richness in semi-natural habitats and landscape complexity differed between groups with the most pronounced positive effects on non-crop pollinators. Our results indicate that while dominant crop pollinators are core components of crop pollinator communities in all agricultural landscapes, opportunistic crop pollinators largely determine species-richness responses and complex landscapes are local hotspots for both biodiversity conservation and potential ecosystem service provision.
Effects of landscape complexity on pollinators are moderated by pollinators' association with mass-flowering crops
Fijen, Thijs P.M. ; Scheper, Jeroen A. ; Boekelo, Bastiaen ; Raemakers, Ivo ; Kleijn, David - \ 2019
Proceedings of the Royal Society. B: Biological Sciences 286 (2019)1900. - ISSN 0962-8452 - 1 p.
crop pollinator species pool - dominant crop pollinators - landscape complexity - local pollinator species pool - non-crop pollinators - opportunistic crop pollinators

Conserving and restoring semi-natural habitat, i.e. enhancing landscape complexity, is one of the main strategies to mitigate pollinator decline in agricultural landscapes. However, we still have limited understanding of how landscape complexity shapes pollinator communities in both crop and non-crop habitat, and whether pollinator responses to landscape complexity vary with their association with mass-flowering crops. Here, we surveyed pollinator communities on mass-flowering leek crops and in nearby semi-natural habitat in landscapes of varying complexity. Surveys were done before and during crop bloom and distinguished between pollinators that visit the crop frequently (dominant), occasionally (opportunistic), or not at all (non-crop). Forty-seven per cent of the species in the wider landscape were also observed on leek flowers. Crop pollinator richness increased with local pollinator community size and increasing landscape complexity, but relationships were stronger for opportunistic than for dominant crop pollinators. Relationships between pollinator richness in semi-natural habitats and landscape complexity differed between groups with the most pronounced positive effects on non-crop pollinators. Our results indicate that while dominant crop pollinators are core components of crop pollinator communities in all agricultural landscapes, opportunistic crop pollinators largely determine species-richness responses and complex landscapes are local hotspots for both biodiversity conservation and potential ecosystem service provision.

Wilde bijen en zweefvliegen per landschapstype
Ozinga, Wim A. ; Scheper, Jeroen A. ; Groot, Arjen de; Reemer, Menno ; Raemakers, Ivo ; Dooremalen, Coby van; Biesmeijer, Koos ; Kleijn, David - \ 2018
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2920) - 57
Bij de bestuiving van veel voedselgewassen en wilde planten spelen bloembezoekende insecten een essentiële rol. Het gaat dan niet alleen over honingbijen, maar over een breed spectrum van soorten wilde bijen en zweefvliegen. Er zijn sterke aanwijzingen dat de laatste decennia zowel de aantallen als de soortendiversiteit van bestuivers sterk achteruit zijn gegaan. Via de Nationale Bijenstrategie werken het ministerie van LNV en meer dan vijftig maatschappelijke partners samen om bestuivers en bestuivingsdiensten in ons land te behouden en bevorderen. Dit is in de praktijk lastig, omdat in Nederland honderden soorten bijen en zweefvliegen voorkomen met elk hun specifieke wensen ten aanzien van hun leefgebied en omdat in verschillende landschapstypen verschillende soorten voorkomen. Maatwerk is dus geboden. In dit rapport wordt het voorkomen van bijen en zweefvliegen in verschillende landschapstypen in beeld gebracht. Doel van deze informatie is om snel inzicht te kunnen krijgen in de relevante soorten bestuivers die zouden kunnen voorkomen in een bepaalde regio, om vervolgens gerichte maatregelen te kunnen nemen die aansluiten bij de eisen die deze soorten aan hun omgeving stellen. Bij de interpretatie van het belang van de landschapstypen voor bestuivende insecten is onderscheid gemaakt tussen bedreigde soorten en soorten die in potentie een belangrijke rol kunnen spelen bij de bestuiving van landbouwgewassen.
Data from: Insect pollination is at least as important for marketable crop yield as plant quality in a seed crop
Fijen, T.P.M. ; Scheper, J.A. ; Boom, Timo M. ; Janssen, N. ; Raemakers, Ivo ; Kleijn, D. - \ 2018
crop pollination - crop yield - agricultural management - functional groups - species richness - visitation rate - agro-ecology - structural equation modeling - Allium porrum
The sustainability of agriculture can be improved by integrating management of ecosystem services, such as insect pollination, into farming practices. However, large‐scale adoption of ecosystem services‐based practices in agriculture is lacking, possibly because growers undervalue the benefits of ecosystem services compared to those of conventional management practices. Here we show that, under representative real‐world conditions, pollination and plant quality made similar contributions to marketable seed yield of hybrid leek (Allium porrum). Relative to the median, a 25% improvement of plant quality and pollination increased crop value by an estimated $18 007 and $17 174 ha−1 respectively. Across five crop lines, bumblebees delivered most pollination services, while other wild pollinator groups made less frequent but nevertheless substantial contributions. Honeybees actively managed for pollination services did not make significant contributions. Our results show that wild pollinators are an undervalued agricultural input and managing for enhancing pollinators makes sense economically in high‐revenue insect‐pollinated cropping systems.
Insect pollination is at least as important for marketable crop yield as plant quality in a seed crop
Fijen, Thijs P.M. ; Scheper, Jeroen A. ; Boom, Timo M. ; Janssen, Nicole ; Raemakers, Ivo ; Kleijn, David - \ 2018
Ecology Letters 21 (2018)11. - ISSN 1461-023X - p. 1704 - 1713.
The sustainability of agriculture can be improved by integrating management of ecosystem services, such as insect pollination, into farming practices. However, large‐scale adoption of ecosystem services‐based practices in agriculture is lacking, possibly because growers undervalue the benefits of ecosystem services compared to those of conventional management practices. Here we show that, under representative real‐world conditions, pollination and plant quality made similar contributions to marketable seed yield of hybrid leek (Allium porrum). Relative to the median, a 25% improvement of plant quality and pollination increased crop value by an estimated $18 007 and $17 174 ha−1 respectively. Across five crop lines, bumblebees delivered most pollination services, while other wild pollinator groups made less frequent but nevertheless substantial contributions. Honeybees actively managed for pollination services did not make significant contributions. Our results show that wild pollinators are an undervalued agricultural input and managing for enhancing pollinators makes sense economically in high‐revenue insect‐pollinated cropping systems.
Exportwaarde kaas flink gestegen in 2017
Greijdanus, Auke - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 60 - 64.
Duitsland belangrijke handelspartner in varkensvlees
Hoste, R. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 65 - 69.
Duitsland veruit belangrijkste bestemming voor Nederlandse eieren
Horne, P.L.M. van - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 69 - 73.
Nederlandse bloembollenexport is wereldhandel
Stokkers, R. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 73 - 77.
De Nederlandse landbouwexport in breder perspectief
Ramaekers, P. ; Jukema, G.D. ; Ruijs, M.N.A. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 85 - 102.
De Nederlandse handel in landbouwgoederen
Ramaekers, P. ; Jukema, G.D. ; Ruijs, M.N.A. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 11 - 36.
Nederlandse handelsbalans appels in evenwicht
Meer, R.W. van der - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 38 - 42.
Positieve handelsbalans voor bevroren aardappelproducten
Janssens, S.R.M. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 43 - 46.
Export tomaten neemt weer toe
Benninga, J. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 47 - 50.
Handelsoverschot snijbloemen iets omlaag
Benninga, J. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 51 - 55.
Exportgroei boomkwekerijproducten zet in 2017 door
Smit, P.X. - \ 2018
In: De Nederlandse landbouwexport 2017 / Raemakers, Pascal, Dolman, Mark, Jukema, Gerben, Den Haag : Centraal Bureau voor de Statistiek - ISBN 9789035724174 - p. 56 - 59.
Het behoud van wilde bijen in het landelijk gebied: is bloemen zaaien de oplossing?
Kleijn, D. ; Fijen, T.P.M. ; Raemakers, I. ; Scheper, J.A. - \ 2017
De Levende Natuur 118 (2017)3. - ISSN 0024-1520 - p. 98 - 104.
De laatste tijd is er veel aandacht voor de achteruitgang van bijen. Er zijn inmiddels veel initiatieven om wilde bijen een handje te helpen, meestal door het inzaaien van bloemenmengsels. Maar profiteren wilde bijen hier wel van? Welke soorten hebben daar het meest baat bij? Bevordert dit ook de bestuiving van naastgelegen gewassen? En waar moet rekening mee gehouden worden bij het aanleggen en beheren van een goede bloemenstrook? Aan de hand van literatuuronderzoek is naar antwoorden gezocht.
Waardplantvoorkeur van hommels: terugkijken in de tijd
Kleijn, D. ; Raemakers, I.P. - \ 2012
Entomologische Berichten 72 (2012)1/2. - ISSN 0013-8827 - p. 21 - 35.
bombus - insect-plant relaties - waardplanten - stuifmeel - populatie-ecologie - fauna - geschiedenis - inventarisaties - nederland - verenigd koninkrijk - belgië - insect plant relations - host plants - pollen - population ecology - history - inventories - netherlands - uk - belgium
Het verklaren van populatietrends is een belangrijk doel geweest van een breed scala aan ecologische studies. Dergelijke studies worden bemoeilijkt doordat bij zeldzame soorten een bepaalde eigenschap of gedrag zowel oorzaak als gevolg kan zijn van de achteruitgang van een soort. Wij omzeilden dit probleem door eigenschappen van soorten te vergelijken aan de hand van exemplaren in natuurhistorische musea die waren verzameld toen de soorten nog algemeen voorkwamen. Over de rol van voedselvoorkeur en -specialisatie als veroorzaker van de achteruitgang van hommelsoorten wordt al lange tijd gediscussieerd. Wij vergeleken de samenstelling van stuifmeelladingen van vijf hommelsoorten met stabiele populaties en vijf soorten met afnemende populaties met behulp van exemplaren in musea die voor 1950 waren verzameld in België, Engeland en Nederland.
Veranderingen in de Nederlandse bijenfauna
Reemer, M. ; Kleijn, D. ; Raemakers, I.P. - \ 2012
In: De Nederlandse bijen (Hymenoptera: Apidae s.l.) / Peters, T.M.J., Nieuwenhuijsen, H., Smit, J., van der Meer, F., Raemakers, I.P., Heitmans, W.R.B., van Achterberg, C., Kwak, M., Loonstra, A.J., de Rond, J., Reemer, M., Zeist : KNNV Uitgeverij (Natuur van Nederland 11) - ISBN 9789050114479 - p. 103 - 107.
Field testing and exploitation of genetically modified cassava with low-amylose or amylose-free starch in Indonesia
Koehorst-van Putten, H.J.J. ; Sudarmonowati, E. ; Herman, M. ; Pereira-Bertram, I.J. ; Wolters, A.M.A. ; Meima, H. ; Vetten, N. de; Raemakers, C.J.J.M. ; Visser, R.G.F. - \ 2012
Transgenic Research 21 (2012)1. - ISSN 0962-8819 - p. 39 - 50.
manihot-esculenta crantz - cyclic somatic embryogenesis - t-dna - potato - transformation - plants - regeneration - expression - synthase - cultures
The development and testing in the field of genetically modified -so called- orphan crops like cassava in tropical countries is still in its infancy, despite the fact that cassava is not only used for food and feed but is also an important industrial crop. As traditional breeding of cassava is difficult (allodiploid, vegetatively propagated, outbreeding species) it is an ideal crop for improvement through genetic modification. We here report on the results of production and field testing of genetically modified low-amylose transformants of commercial cassava variety Adira4 in Indonesia. Twenty four transformants were produced and selected in the Netherlands based on phenotypic and molecular analyses. Nodal cuttings of these plants were sent to Indonesia where they were grown under biosafety conditions. After two screenhouse tests 15 transformants remained for a field trial. The tuberous root yield of 10 transformants was not significantly different from the control. Starch from transformants in which amylose was very low or absent showed all physical and rheological properties as expected from amylose-free cassava starch. The improved functionality of the starch was shown for an adipate acetate starch which was made into a tomato sauce. This is the first account of a field trial with transgenic cassava which shows that by using genetic modification it is possible to obtain low-amylose cassava plants with commercial potential with good root yield and starch quality.
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