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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    Assessing the activity of individual group-housed broilers throughout life using a passive radio frequency identification system—a validation study
    Sluis, Malou van der; Haas, Yvette de; Klerk, Britt de; Rodenburg, T.B. ; Ellen, Esther D. - \ 2020
    Sensors 20 (2020)13. - ISSN 1424-8220 - p. 1 - 21.
    Activity - Broilers - Radio frequency identification - Tracking - Ultra-wideband - Video

    Individual data are valuable for assessing the health, welfare and performance of broilers. In particular, data on the first few days of life are needed to study the predictive value of traits recorded early in life for later life performance. However, broilers are generally kept in groups, which hampers individual identification and monitoring of animals. Sensor technologies may aid in identifying and monitoring individual animals. In this study, a passive radio frequency identification (RFID) system was implemented to record broiler activity, in combination with traditional video recordings. The two main objectives were 1) to validate the output of the RFID system by comparing it to the recorded locations on video, and 2) to assess whether the number of antennas visited per unit time could serve as a measure of activity, by comparing it to the distance recorded on video and to the distance moved as recorded using a validated ultra-wideband (UWB) tracking system. The locations recorded by the RFID system exactly matched the video in 62.5% of the cases, and in 99.2% of the cases when allowing for a deviation of one antenna grid cell. There were moderately strong Spearman rank correlations between the distance recorded with the RFID system and the distance recorded from video (rs = 0.82) and between UWB and RFID (rs = 0.70) in approximately one-hour recordings, indicating that the RFID system can adequately track relative individual broiler activity, i.e., the activity level of a broiler in comparison to its group members. As the RFID tags are small and lightweight, the RFID system is well suited for monitoring the individual activity of group-housed broilers throughout life.

    Mass trapping of the apple sawfly Hoplocampa testudinea
    Helsen, H.H.M. ; Jansonius, P.J. ; Brouwer, G.W. ; Sluis, B.J. van der; Tol, R.W.H.M. van; Groot, A.V. de; Kats, R.J.M. van; Maas, M.P. van der - \ 2020
    In: Proceedings of the Conference, 17-19 February 2020, Hohenheim, Germany. - - p. 99 - 102.
    19th International Conference on Organic Fruit Growing: Proceedings of the Conference, 17-19 February 2020, Hohenheim
    Op weg naar een duurzame visserij op het IJsselmeer- Markermeer; gezamenlijke bestandopnamen als stap naar breed gedragen vangstadviezen : Aanvulling 2019 en Evaluatie
    Vrooman, Jip ; Bruijn, Paulien de; Kampen, Jouke ; Sluis, Marieken van der; Vries, Pepijn de - \ 2020
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C042/20) - 61
    Sun cream for trees?
    Sluis, Bart van der - \ 2020
    Bestrijding suzuki-fruitvlieg : Werkingsmechanisme van middelen verschillend
    Helsen, H.H.M. ; Sluis, B.J. van der - \ 2020
    De Fruitteelt 2020 (2020)6. - ISSN 0016-2302 - p. 6 - 7.
    In het veld : op zoek naar de Bobak
    Sluis, T. van der - \ 2020
    Landschap : tijdschrift voor landschapsecologie en milieukunde 37 (2020)1. - ISSN 0169-6300 - p. 49 - 49.
    Op Pad met... : Henk Baas in IJdoorn
    Dekker, Jos ; Sluis, T. van der - \ 2020
    Landschap : tijdschrift voor landschapsecologie en milieukunde 37 (2020)1. - ISSN 0169-6300 - p. 28 - 33.
    Klimaatuitdagingen voor Nederland : Wat kunnen we over landgebruik leren van het IPCC?
    Jongman, R.H.G. ; Sluis, T. van der - \ 2020
    Landschap : tijdschrift voor landschapsecologie en milieukunde 31 (2020)1. - ISSN 0169-6300 - p. 42 - 48.
    Linking the morphology and ecology of subtidal soft-bottom marine benthic habitats: A novel multiscale approach
    Mestdagh, Sebastiaan ; Amiri-Simkooei, Alireza ; Reijden, Karin J. van der; Koop, Leo ; O'Flynn, Sarah ; Snellen, Mirjam ; Sluis, Christiaan Van; Govers, Laura L. ; Simons, Dick G. ; Herman, Peter M.J. ; Olff, Han ; Ysebaert, Tom - \ 2020
    Estuarine Coastal and Shelf Science 238 (2020). - ISSN 0272-7714
    Macrobenthos - Multibeam sonar - Sand waves - Sandbanks - Seafloor morphology - Video transect

    High-resolution surveying techniques of subtidal soft-bottom seafloor habitats show higher small-scale variation in topography and sediment type than previously thought, but the ecological relevance of this variation remains unclear. In addition, high-resolution surveys of benthic fauna show a large spatial variability in community composition, but this has yet poorly been linked to seafloor morphology and sediment composition. For instance, on soft-bottom coastal shelves, hydrodynamic forces from winds and tidal currents can cause nested multiscale morphological features ranging from metre-scale (mega)ripples, to sand waves and kilometre-scale linear sandbanks. This multiscale habitat heterogeneity is generally disregarded in the ecological assessments of benthic habitats. We therefore developed and tested a novel multiscale assessment toolbox that combines standard bathymetry, multibeam backscatter classification, video surveying of epibenthos and box core samples of sediment and macrobenthos. In a study on the Brown Bank, a sandbank in the southern North Sea, we found that these methods are greatly complementary and allow for more detail in the interpretation of benthic surveys. Acoustic and video data characterised the seafloor surface and subsurface, and macrobenthos communities were found to be structured by both sandbank and sand wave topography. We found indications that acoustic techniques can be used to determine the location of epibenthic reefs. The multiscale assessment toolbox furthermore allows formulating recommendations for conservation management related to the impact of sea floor disturbances through dredging and trawling.

    Overwintered Drosophila Suzukii are the main source for infestations of the first fruit crops of the season
    Panel, Aurore ; Zeeman, Laura ; Sluis, B.J. van der; Elk, P.J.H. van; Pannebakker, B.A. ; Wertheim, Bregje ; Helsen, H.H.M. - \ 2019
    In: IOBC-WPRS Bulletin IOBC-WPRS (IOBC-WPRS Bulletin ) - p. 27 - 29.
    Vis in het Eems-estuarium
    Jager, Zwanette ; Leeuw, Joep de; Hal, Ralf van; Molla Gazi, Karolina ; Mulder, Ingeborg ; Sluis, Marieken van der - \ 2019
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C069/19) - 56
    De hier voorliggende korte rapportage betreft een bundeling van de resultaten van verschillende vismonitoring surveys, zoals deze worden uitgevoerd door Wageningen Marine Research en BioConsult in het Eems-estuarium. Deze rapportage is opgesteld in opdracht van Rijkswaterstaat WVL en zal door Rijkswaterstaat worden gebruikt bij het samenstellen van een jaarlijkse rapportage over het Eems-estuarium in het kader van het programma Eems-Dollard 2050 (ED2050).
    Cooperating for grassland conservation : Cross-regional networking event in support of the Natura 2000 biogeographical process, 16th Eurasian Grassland Conference, Graz(Austria), 28th May 2019
    Sluis, T. van der; Sliva, Jan - \ 2019
    EC - 19 p.
    During the 16th Eurasian Grassland Conference, organised by the Eurasian Dry Grassland Group (EDGG) together with the University of Graz, a network event took place on the management of dry grasslands. The Regional networking event was held in Graz, Austria in May 2019. A total of 16 experts participated. The program focussed on three discussion topics:
    • What are traditional management methods that are still being practiced, and how have they developed/altered over time? • What tools do farmers need in relation to N2000, to maintain Favourable Conservation Status, for monitoring and adaptive management? • Is there a specific regional focus required for action; are there regional differences which require different tools or are tools sufficiently adaptable?

    An international team of experts nominated by EU Member States has prepared the Habitat Action Plan 6210, which is very relevant for the conservation of species rich grasslands. The BioGeographical Process (BGP) presented the plan on behalf of Concha Olmeida, one of the authors. Both the presentation and the a summary of the Action plan have been shared with the participants. Several presenters highlighted various aspects of grassland management. In particular relevant discussions were held in relation to forms of traditional management of complex landscape systems, indigenous knowledge, and how current (national) regulations sometimes fail to facilitate the continuation of such management.
    The themes were discussed in an interactive way, in small working groups, to stimulate involvement from all participants.
    The second part of the workshop continued with following questions:
    1. How can we sustain adjusted management methods, and what support measures are needed? 2. How can we ensure ecological and economical sustainability of grassland management independent of financial support? 3. How can we ensure actions towards FCS at various levels?

    In summary, the following recurring suggestions were made in the workshop: - more flexibility is necessary to cope with regional differences, in particular with regard to traditional knowledge; - Although the directives come from Brussels, it is the countries that implement them. The Directives are not perfect, but some of the problems arise at national level, and Member States have freedom to adapt the directive to national or regional needs; - subsidies are not always the solution, and sometimes they are the problem. It creates dependency on external funding and does not generate intrinsic motivation of farmers; - still, payments should be sufficient to cover costs of farmers, and to ensure sufficient income; - the price of products should take the quality into account; however, it is noted that in some countries the willingness to pay is much higher than in other, e.g. in the Netherlands or Germany many people want cheap products, whereas consumers in Austria or Italy may value more high-quality (expensive) food.
    Deliverable 2.1: Policy. A review of policies and practices throughout Europe on mineral resources and land use
    Henkens, R.J.H.G. ; Bouwma, I.M. ; Cormont, A. ; Sluis, T. van der; Arvidsson, Ronald ; Raaness, A. - \ 2019
    Horizon 2020 - 23 p.
    Access to mineral resources in Europe is important for the economic development of Europe. At the same time, it is widely recognised that it is essential that minerals are responsibly sourced for the sustainable development of Europe. The question is how to balance societal interests, such as expanding cities, infrastructure development, agriculture and nature conservation with the exploration and mining of mineral resources. Land-use planning is a key- mechanism to balance various societal interests to guide sustainable spatial development. Therefore, the integration of mineral resources policies into land-use planning at different levels is a key factor for achieving responsibly sourced minerals. This deliverable of MinLand assesses the current state of affairs on land-use planning in relation to mineral exploration and the safeguarding of mineral resources. The deliverable reviews the issue of governance (e.g. the division of responsibilities between different levels) with a special emphasis on the coherence between existing mineral policies, legislation and land use planning. To analyse this, a survey was conducted amongst 18 participating countries (16 EU Member States plus Ukraine and Norway) to assess the current state of affairs. The mineral land use process has been further visualized for nine EU countries in section 2. In addition to the questionnaire and its updates, additional information has been gathered by contact through emails with consortium experts.
    Mineral land use processes are further analysed and scrutinized in Deliverable D4.2. D4.2 provides the reader with an evaluation of the interplay between the different parts of the land use processes and permitting procedures.
    The current deliverable is one in a series related to mineral policies and land use. This is a first step in describing how mineral raw materials relate to land use together with deliverables D2.3, D3.2 and D3.3. These land use issues will be further elaborated within WP4 (particularly D4.2), WP5, WP6 and WP7. The next step in this process building upon the gathered information is the D4.2.
    On-farm automated tracking of group-housed poultry
    Ellen, E.D. ; Sluis, M. van der; Klerk, B. de; Haas, Y. de; Hijink, Thijme ; Rodenburg, T.B. - \ 2019
    In: Book of abstracts of the 70th Annual Meeting of the European Federation of Animal Science (EAAP). - Wageningen Academic Publishers (Book of Abstracts ) - ISBN 9789086863396 - p. 136 - 136.
    Production animals, including poultry, are increasingly kept in groups, making identication and tracking of individual animals challenging. Often video analyses are used, but these are time-consuming and prone to human error. Therefore, automated systems for monitoring individual animals are desired. One possible approach is the implementation of an ultra-wideband (UWB) system to track individual animals. A previous study implemented an UWB system for laying hens in a research setting. Hens were tted with an UWB tag in a small backpack and, using stationary sensing beacons, the location of each bird could be determined. Compared to video tracking of individual birds, the UWB system was shown to be capable of detecting the bird’s location with 85% accuracy. In the current study, the system was applied on a broiler farm to assess its on-farm applicability. At approximately 14 days of age, broilers were tted with an UWB tag. Twelve birds were tracked with the UWB system on nineteen consecutive days, for one hour each day. Distances moved according to the UWB system were compared to those found on video and a moderately strong correlation between the UWB system and video tracking was found (Repeated measures correlation, r=0.71, P<0.0005). Furthermore, individual levels of activity were assessed using this setup. 137 birds from different genetic crosses were tracked near-continuously for seventeen consecutive days. First results indicate that for all crosses, the UWB system was found to be capable of detecting a decrease in activity over time. Overall, the UWB system appears well-suited for tracking of broilers. However, the UWB tags are relatively large. Therefore, tracking and monitoring of young broilers is not possible. Current work is focussing on implementing a passive radio frequency identication system, with smaller tags. Possibly, this system can track individual activity of broiler chickens throughout their life.
    Migratie van zoetwaterstandvis tussen Noordzeekanaal en omliggende boezems en polders
    Griffioen, A.B. ; Kroes, R. - \ 2019
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C126/19) - 111
    Er wordt in Nederland relatief veel aandacht besteed aan de migratie van trekvissen als aal, zalm, zeeforel en andere soorten. Belangrijke voorbeelden voor Nederland zijn bijvoorbeeld: ‘de Kier’ bij het Haringvliet, de realisatie van de Vismigratierivier bij Kornwerderzand, de Swimway Vecht en de vele andere (lokale) initiatieven om de keten van migratie voor vis mogelijk te maken tussen wateren. Ook liggen inmiddels vele migratievoorzieningen in en rond het Noordzeekanaal. Dit is hard nodig omdat veel watersystemen sterk zijn gecompartimenteerd. Aan de ene kant om het land te beschermen tegen overstroming door de zee, de grote rivieren en de grote meren zijn dijken aangelegd. Aan de andere kant om het gebied leefbaar te maken en de landbouw te optimaliseren zijn de watersystemen met behulp van gemalen, dijken, dammen, stuwen en andere kunstwerken in kleine beheersbare eenheden verdeeld en daarmee afgesloten geraakt voor migrerende vissen. Niet alleen ‘de bekende’ trekvissen zoals de paling of de zalm hebben een migratiedrang om (grote) afstanden te zwemmen, ook zoetwatervissen trekken van het ene water naar het andere. Dit gebeurt om verschillende redenen, zoals bijvoorbeeld voor de paai, migratie naar opgroeigebied, of naar ander water voor de winterrust. Deze rapportage betreft een datarapportage voor het eerste migratieseizoen in 2019 t/m 19 augustus waar met PIT telemetrie techniek onderzoek gedaan is bij vijf locaties: Gemaal Halfweg, Gemaal Nauerna, Gemaal Kadoelen, Willem I-sluis en Oranjesluizen. In het voorjaar van 2019 zijn 1844 vissen van 15 verschillende soorten gemerkt met PIT tags. Het merendeel daarvan betrof brasem en blankvoorn, maar er is bijvoorbeeld ook snoekbaars en baars gemerkt. Grote snoekbaars en baars zijn ook uitgerust met een van buitenaf zichtbare Floytag voor terugmelding door sport of beroepsvisssers. Om de zwembewegingen in de buurt van de onderzoekslocaties te volgen zijn PIT tag antennes geïnstalleerd bij de vispassages (Halfweg, Nauerna, Kadoelen en Oranjesluizen) of de vismigratievoorziening via rinketten (Willem I). Daarnaast zijn ook de uitstroomzijdes van gemalen afgedekt met antennes (Halfweg, Nauerna en Kadoelen). Het doel van het onderzoek is om het gebruik van vismigratievoorzieningen door vissen te evalueren en daarnaast zwembewegingen tussen het Noordzeekanaal en boezem/polder te volgen. In totaal zijn tot 19 augustus 2019 717 individuele vissen gedetecteerd op een van de antennes met in totaal ruim 1.300.000 detecties. De resultaten laten zien dat de gemerkte brasems op grote schaal (tientallen km) migreren in relatief korte tijd. Individuele brasems worden op meerdere locaties gezien door de telemetrie. Ook wordt waargenomen dat gemerkte vissen langdurig in de buurt van een gemaaluitstroom blijven rondzwemmen. In totaal zijn er twee terugmeldingen geweest van sportvisserij die snoekbaars hadden gevangen: een snoekbaars die gemerkt was bij Nauerna (en ook daar gevangen) en een die gemerkt was bij de Oranjesluizen en teruggevangen bij de Entrepothaven (Amsterdam-Rijnkanaal). In de volgende maanden gaan we door met het verzamelen van de detecties en blijven we de techniek controleren. Aanbevolen wordt om in het voorjaar van 2020 extra vissen van een merk te voorzien op de locaties waar in 2019 de passages laat zijn opgeleverd of waar er relatief weinig vissen zijn gevangen. Daarnaast wordt aanbevolen om een extra voorjaar te monitoren (2021) om patronen in het migratiegedrag beter inzichtelijk te krijgen en te beoordelen of er sprake is van willekeurige of gerichte migratie, bijvoorbeeld ten behoeve van paai of overwintering.
    Vismonitoring Zoete Rijkswateren en Overgangswateren t/m 2018 : Deel II: Toegepaste methoden
    Sluis, M.T. van der; Cremer, J.M.S. ; Griffioen, A.B. ; Keeken, O.A. van; Os-Koomen, E. van; Wiegerinck, J.A.M. ; Bruijn, P.J.A. de - \ 2019
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C086/19) - 98
    Om een inschatting te krijgen van de kwaliteit van de zoete rijkwateren en overgangswateren, wordt het vismonitoringprogramma uitgevoerd. Dit programma maakt deel uit van het Programmaplan Vis-en Biotamonitoring 2018-2023 van Rijkswaterstaat en het Wettelijke Onderzoekstaken (WOT) programma in opdracht van het ministerie van Landbouw, Natuur en Voedselkwaliteit (LNV). Het programma bestaat uit 13 monitoringsprogramma’s en één registratieprogramma in de grote zoete rijkswateren (meren en rivieren) en overgangswateren en in de spuikom bij Kornwerderzand in de Waddenzee. Ontsluiting van vismonitoringsgegevens gebeurt op drie manieren: Deel I ‘Toestand en trends’ waarin de resultaten worden geïnterpreteerd (trends en duiding), het hier voorliggende rapport (Deel II) is een achtergronddocument waarin de gebruikte monitoringsmethodieken in de verschillende vismonitoringen in de zoete rijkswateren en overgangswateren t/m 2018 worden vastgelegd. Daarnaast worden de monitoringsdata via het dataportal1 ontsloten, voorheen heette dat Deel III. Wijzigingen die in 2018 zijn doorgevoerd, staan puntsgewijs opgesomd in paragraaf 1.1. De veranderingen betreffen het beëindigen van bepaalde bemonsteringen of juist het starten van nieuwe bemonsteringen, maar ook veranderingen in monsterlocaties of –frequenties en rapportage.
    Weinig verandering in begrotingsrichtprijzen appel en peer
    Groot, M.J. ; Sluis, B.J. van der - \ 2019
    De Fruitteelt 2019 (2019)3. - ISSN 0016-2302 - p. 17 - 19.
    Evaluation of resistance against ash dieback in Fraxinus spp.
    Hiemstra, J.A. ; Sluis, B.J. van der; Coolen, Silvia - \ 2019
    - 1 p.
    Fokdoelen en fokwaarden: hoe kies je een passende stier voor je bedrijf?
    Breukelen, Anouk van; Doekes, H.P. ; Hoving, A.H. ; Sluis, M. van der; Poppe, H.W.M. - \ 2019
    INPUT DOCUMENT Natura 2000 seminar for the Boreal region : 3rd Natura 2000 seminar for the Boreal region
    Sluis, T. van der; Sepp, Kalev ; Pungar, Diana ; Bouwma, I.M. - \ 2019
    EU - 48 p.
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