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.

    We have a manual that explains all the features 

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    Linking the morphology and ecology of subtidal soft-bottom marine benthic habitats: A novel multiscale approach. Brown Bank 2017 - Biological and geomorphological data
    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
    Utrecht University
    Macrobenthos - Multibeam sonar - Sand waves - Sandbanks - Seafloor morphology
    22 stations on and around the Brown Bank were selected to study local ecological variation and to link ecological with geomorphological data. Macrobenthos was collected with a box corer and identified to the lowest possible taxonomic level, in three replicates per station. Sediment characteristics (grain size, TOC, chlorophyll α etc.) were measured for each replicate. Geomorphological data (bathymetry, backscatter, BPI etc.) were derived from multibeam echosounding at each station.
    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.
    IPBES: van ‘Forum assessment’ naar actie
    Sluis, T. van der; Turnhout, E. - \ 2019
    Landschap : tijdschrift voor landschapsecologie en milieukunde 36 (2019)3. - ISSN 0169-6300 - p. 174 - 175.
    IN HET VELD – Vennen en venen in Drenthe
    Sluis, T. van der - \ 2019
    Landschap : tijdschrift voor landschapsecologie en milieukunde 36 (2019)3. - ISSN 0169-6300 - p. 176 - 176.
    IN HET VELD – Dobberen op de Pechora-rivier
    Sluis, T. van der - \ 2019
    Landschap : tijdschrift voor landschapsecologie en milieukunde 36 (2019)2. - ISSN 0169-6300 - p. 125 - 125.
    Developing sensor technologies to inform breeding approaches to reduce damaging behaviour in laying hens and pigs: The GroupHouseNet approach
    Rodenburg, T.B. ; Bennewitz, J. ; Haas, E.N. De; Košťál, L. ; Pichová, K. ; Piette, D. ; Tetens, J. ; Visser, B. ; Klerk, B. De; Sluis, Malou van der; Zande, L.E. van der; Siegford, J. ; Toscano, M. ; Norton, T. ; Guzhva, O. ; Ellen, E.D. - \ 2019
    In: Precision Livestock Farming 2019. - Teagasc (Precision Livestock Farming 2019 - Papers Presented at the 9th European Conference on Precision Livestock Farming, ECPLF 2019 ) - ISBN 9781841706542 - p. 467 - 470.
    Automatic tracking - Damaging behaviour - Genetic selection

    The European COST Action GroupHouseNet aims to provide synergy for preventing damaging behaviour in group-housed pigs and laying hens. One area of focus of this network is how genetic and genomic tools can be used to breed animals that are less likely to develop damaging behaviour directed at their pen-mates. Reducing damaging behaviour in large groups is a challenge, because it is difficult to identify and monitor individual animals. With the current developments in sensor technologies and animal breeding, there is the possibility to identify individual animals, monitor individual behaviour, and link this information to the genotype. Using a combination of sensor technologies and genomics enables us to select against damaging behaviour in pigs and laying hens.

    Assessing individual activity levels in two broiler lines using an ultra-wideband tracking system
    Sluis, Malou van der; Klerk, B. De; Ellen, E.D. ; Haas, Y. De; Hijink, T. ; Rodenburg, T.B. - \ 2019
    In: Precision Livestock Farming 2019. - Teagasc (Precision Livestock Farming 2019 - Papers Presented at the 9th European Conference on Precision Livestock Farming, ECPLF 2019 ) - ISBN 9781841706542 - p. 903 - 906.
    Activity - Broilers - Tracking - Ultra-wideband

    Individual data on activity of broilers is valuable for breeding programmes, as activity may serve as proxy for multiple health, welfare and performance indicators. However, in current husbandry systems, broilers are often kept in large groups, which makes it difficult to identify and monitor them at the individual level. Sensor technologies, such as ultra-wideband (UWB) tracking systems, might offer solutions. This paper investigated the recorded distances of an UWB tracking system that was applied to broilers, as a first step in assessing the potential of an UWB tracking system for studying individual levels of activity in broilers housed in groups. To this end, the distances moved as recorded by the UWB system were compared to distances recorded on video, using Kinovea video tracking software. There was a moderately strong positive correlation between the output of the UWB system and video tracking, although some under- and over- estimations were observed. Even though the recorded distances from the UWB system may not completely match the true distances moved, the UWB system appears to be well-suited for studying differences in activity between individual broilers when measured with the same system settings.

    Cosmetic aspects in specific marketing standards for fruit and vegetables : removing cosmetic aspects from the EU marketing standards: implications for the market and impact on food waste
    Oosterkamp, Elsje ; Sluis, Addie van der; Geffen, Lisanne van; Aramyan, Lusine ; Bos-Brouwers, Hilke - \ 2019
    The Hague : Wageningen Economic Research (Memorandum / Wageningen Economic Research 2019-014) - 27
    Validation of an ultra-wideband tracking system for recording individual levels of activity in broilers
    Sluis, Malou Van Der; Klerk, Britt De; Ellen, Esther D. ; Haas, Yvette De; Hijink, Thijme ; Rodenburg, Bas - \ 2019
    Animals 9 (2019)8. - ISSN 2076-2615
    Activity - Broilers - Group housing - Tracking - Ultra-wideband

    Broiler chickens are often kept in large groups, which makes it difficult to identify individual birds and monitor their activity. Here, we studied whether an automated tracking system, using ultra-wideband technology, could be implemented to study activity of individual broilers. We compared the distance as recorded with the tracking system to the distance recorded on video and found a moderately strong positive correlation. Using the tracking system, we were able to detect decreases in activity over time, and we found that lightweight birds were on average more active than heavier birds. Both these results match with reports from literature and therefore support the conclusion that the tracking system appears well-suited for monitoring activity in broilers. The information on activity over time that can be collected with this system can potentially be used to study health, welfare and performance at the individual level, but further research into individual patterns in activity is required. Individual data on activity of broilers is valuable, as activity may serve as a proxy for multiple health, welfare and performance indicators. However, broilers are often kept in large groups, which makes it dificult to identify and monitor them individually. Sensor technologies might offer solutions. Here, an ultra-wideband (UWB) tracking system was implemented with the goal of validating this system for individual tracking of activity of group-housed broilers. The implemented approaches were (1) a comparison of distances moved as recorded by the UWB system and on video and (2) a study recording individual levels of activity of broilers and assessing group-level trends in activity over time; that could be compared to activity trends from literature. There was a moderately strong positive correlation between the UWB system and video tracking. Using the UWB system, we detected reductions in activity over time and we found that lightweight birds were on average more active than heavier birds. Both findings match with reports in literature. Overall, the UWB system appears well-suited for activity monitoring in broilers, when the settings are kept the same for all individuals. The longitudinal information on differences in activity can potentially be used as proxy for health, welfare and performance; but further research into individual patterns in activity is required.

    Emissies naar lucht uit de landbouw in 2017 : Berekeningen met het model NEMA
    Bruggen, C. van; Bannink, A. ; Groenestein, C.M. ; Huijsmans, J.F.M. ; Lagerwerf, L.A. ; Luesink, H.H. ; Sluis, S.M. van der; Velthof, G.L. ; Vonk, J. - \ 2019
    Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 147) - 131
    Agricultural activities are in the Netherlands a major source of gaseous emission as ammonia (NH3), nitrogen oxide (NO),nitrous oxide (N2O), methane (CH4) and non-methane volatile organic compounds (NMVOC) and particulate matter (PM10 andPM2.5). The emissions in 2017 were calculated using the National Emission Model for Agriculture (NEMA). The method calculatesthe NH3 emission from livestock manure based on the total ammonia nitrogen (TAN) content in manure. In 2017 NH3 emissionsfrom livestock manure, fertilizer and other sources in agriculture, from hobby farms, private parties and manure application onnature areas amounted to 120.5 million kg NH3, 3.9 million kg more than in 2016. Nitrogen excretion increased due to a largerfeed requirement for dairy cows and higher nitrogen levels in roughage. N2O emissions in 2017 were 21.3 million kg, slightlyabove the level of 2016 (20.7 million kg). The NO emission in 2017 amounted to 23.1 million kg compared to 22.5 million kg in2016. The CH4 emission decreased due to the shrinking of the dairy herd from 508 to 503 million kg. NMVOC emissionsamounted to 98 million kg in 2017 compared to 99 million kg in 2016. Emissions of particulate matter PM10 and PM2.5, 6.2 and0.6 million kg respectively, hardly changed compared to 2016. Some figures in the time series 1990-2016 were revised onbasis of new insights. NH3 emissions from livestock manure in the Netherlands dropped by two thirds since 1990, mainly as aresult of lower nitrogen excretion rates by livestock and low emission manure application. Emissions of N2O and NO alsodecreased over the same period, but less strongly (38% and 31% respectively), due to higher emissions from manure injectioninto the soil and the shift from poultry housing systems with slurry manure towards solid manure systems. CH4 emissions reducedby 14% between 1990 and 2017, caused by a decrease in livestock numbers and increased feed efficiency of dairy cattle.
    Vergelijking van bemonsteringen in het IJsselmeer en Markermeer met de verhoogde 4m-boomkor versus de A-toomkuil
    Sluis, Marieken van der; Vries, Pepijn de; Kampen, Jouke ; Niemeijer, Bart - \ 2019
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research report C084/19) - 49
    Automated tracking of individual activity of broiler chickens
    Sluis, M. van der; Klerk, B. de; Rodenburg, T.B. ; Haas, Y. de; Hijink, Thijme ; Ellen, E.D. - \ 2019
    In: Proceedings of the 53rd Congress of the International Society for Applied Ethology (ISAE). - Wageningen, The Netherlands : Wageningen Academic Publishers - ISBN 9789086863389 - p. 288 - 288.
    There is a growing interest in quantifying individual behaviour of group-housed animalsand its relation to individual performance. Broiler chickens are an example of a livestockspecies for which individual data can be valuable. Broiler breeding goals focus on efficientgrowth and reproduction, as well as welfare indicators for balanced genetic improvements.Recording of broiler behaviour can provide insight into welfare indicators, such as activity orgeneral leg health. However, monitoring individual behaviour in group-housed animals is achallenge. Often, video analyses are used, but these are time-consuming and prone to humanerror. Therefore, automated systems for monitoring individual animals are desired. Here, westudied whether individual broiler activity could be tracked using an ultra-wideband (UWB)system. Birds were fitted with UWB tags that sent out signals to four beacons. The location ofthe birds was determined using triangulation of the signal, allowing calculation of distancesmoved over time. Distances moved according to the UWB system were compared to thosefound on video for twelve birds. A moderately strong correlation between the UWB systemand video tracking was found (Repeated measures correlation, r=0.71 (95%-CI: 0.64-0.77),df=209, P<0.001). Furthermore, the UWB system was used for assessing individual levels ofactivity. In total, 137 birds from different genetic crosses were tracked near-continuously forseventeen consecutive days, starting on day 16 of life, and their weight was determined at thestart and end of this 17 d period. Data were analysed using an LME-model in R. First analysesshowed that activity, measured as the average distance moved, decreased over the seventeendays in all genetic crosses (F(1,127.00)=301.47, P<0.001). Furthermore, in all genetic crosses,birds with a lower weight at the start of the trial were on average more active (F(1,125.14)=9.16,P<0.01). Overall, the UWB system appears well-suited for activity monitoring in broilers andthe longitudinal information on individual differences in activity can potentially be used tomonitor health, welfare and performance at the individual level. Unfortunately, the UWBtags are too large and heavy for day-old chicks to wear and can only be implemented later inlife. Therefore, current work is focussing on the implementation of a passive radio frequencyidentification (RFID) system to track individual broiler activity, using smaller, lightweight tagsthat can be attached to the broilers’ legs at day-old. This system may be able to track individualactivity of broiler chickens throughout the entire life.
    Reduce damaging behaviour in laying hens and pigs by developing sensor technologies to inform breeding programs
    Rodenburg, T.B. ; Zande, Lisette van der; Haas, E.N. de; Kostal, L. ; Pichova, Katarina ; Piette, Deborah ; Tetens, Jens ; Visser, Bram ; Klerk, Britt de; Sluis, M. van der; Bennewitz, Jörn ; Siegford, Janice ; Norton, Tomas ; Guzhva, Oleksiy ; Ellen, E.D. - \ 2019
    In: Proceedings of the 53rd Congress of the International Society for Applied Ethology (ISAE). - Wageningen, The Netherlands : Wageningen Academic Publishers - ISBN 9789086863389 - p. 364 - 364.
    The COST Action GroupHouseNet aims to facilitate the prevention of damaging behaviourin group-housed pigs and laying hens. One area of focus is on how genetic and genomictools can be used to breed for animals that are less likely to develop damaging behaviour.The behaviours we are focusing on are feather pecking in laying hens and tail biting in pigs.Both species are kept in groups, and identifying actual performers of this behaviour (peckersand biters), and tracking them at the individual level remains challenging, but is essential forbreeding programs. It is possible to use traditional behavioural observation, but this is timeconsumingand costly. Sensor technology is a rapidly developing field and may offer solutionsfor phenotyping animals at the individual level. We propose that sensor technology combinedwith genomic methods may be useful in solving the problems of damaging behaviour in grouphousedpigs and laying hens. When evaluating the sensor technologies used until now, forlaying hens RFID and accelerometer-based approaches seem most promising. In pigs, computervision is already used to record technical performance, and there seems to be potential forexpanding this approach to the recording of damaging behaviour. If sensor signatures andgenomic fingerprints of individual animals can be combined, this would significantly improveour possibilities to reduce damaging behaviour through genetic selection.
    Automated tracking of individual activity of broiler chickens
    Sluis, M. van der; Klerk, B. de; Rodenburg, T.B. ; Haas, Y. de; Hijink, Thijme ; Ellen, E.D. - \ 2019
    Vismonitoring Zoete Rijkswateren en Overgangswateren t/m 2017 : Deel II: Toegepaste methoden
    Sluis, M.T. van der; Tien, N.S.H. ; Griffioen, A.B. ; Keeken, O.A. van; Os-Koomen, E. van; Wiegerinck, J.A.M. - \ 2019
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C007.19a) - 101
    Evaluatie vismigratievoorziening Kleine Sluis IJmuiden voor schieraal
    Griffioen, A.B. ; Burggraaf, D. ; Keeken, O.A. van; Winter, H.V. - \ 2019
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C014/19) - 32
    Fruitteelt en Boomkwekerij 2030 Home
    Balk, Peter ; Dalfsen, P. van; Harteveld, D.O.C. ; Heiden, Alma van der; Reuler, H. van; Sluis, B.J. van der - \ 2019
    Wageningen : Groen Kennisnet
    Review of sensor technologies in animal breeding: Phenotyping behaviors of laying hens to select against feather pecking
    Ellen, Esther D. ; Sluis, Malou Van Der; Siegford, Janice ; Guzhva, Oleksiy ; Toscano, Michael J. ; Bennewitz, Jörn ; Zande, Lisette E. Van Der; Eijk, Jerine A.J. Van Der; Haas, Elske N. de; Norton, Tomas ; Piette, Deborah ; Tetens, Jens ; Klerk, Britt de; Visser, Bram ; Bas Rodenburg, T. - \ 2019
    Animals 9 (2019)3. - ISSN 2076-2615
    -omics - Computer vision - Damaging behavior - Genetic selection - Identification - Measuring behavior - Radio frequency identification - Ultra-wideband

    Damaging behaviors, like feather pecking (FP), have large economic and welfare consequences in the commercial laying hen industry. Selective breeding can be used to obtain animals that are less likely to perform damaging behavior on their pen-mates. However, with the growing tendency to keep birds in large groups, identifying specific birds that are performing or receiving FP is difficult. With current developments in sensor technologies, it may now be possible to identify laying hens in large groups that show less FP behavior and select them for breeding. We propose using a combination of sensor technology and genomic methods to identify feather peckers and victims in groups. In this review, we will describe the use of “-omics” approaches to understand FP and give an overview of sensor technologies that can be used for animal monitoring, such as ultra-wideband, radio frequency identification, and computer vision. We will then discuss the identification of indicator traits from both sensor technologies and genomics approaches that can be used to select animals for breeding against damaging behavior.

    In het veld : Leven op de vulkaan...
    Sluis, T. van der - \ 2019
    Landschap : tijdschrift voor landschapsecologie en milieukunde 36 (2019)1. - ISSN 0169-6300 - p. 49 - 49.
    Geïntegreerd natuur- en landschapsbeheer. Succesfactoren voor het ontwikkelen van natuur en landschap : Boek
    Sluis, T. van der - \ 2019
    Landschap : tijdschrift voor landschapsecologie en milieukunde 36 (2019)1. - ISSN 0169-6300 - p. 40 - 41.
    Visbestandsonderzoek op IJsselmeer wordt uitgebreid: monitoring 's nachts met de A-toomkuil
    Sluis, M.T. van der - \ 2019
    Methodology for estimating emissions from agriculture in the Netherlands : Calculations of CH4, NH3, N2O, NOx, NMVOC, PM10, PM2.5 and CO2 with the National Emission Model for Agriculture (NEMA), Update 2019
    Lagerwerf, L.A. ; Bannink, A. ; Bruggen, C. van; Groenestein, C.M. ; Huijsmans, J.F.M. ; Kolk, J.W.H. van der; Luesink, H.H. ; Sluis, S.M. van der; Velthof, G.L. ; Vonk, J. - \ 2019
    Wageningen : Statutory Research Tasks Unit for Nature & the Environment (WOt technical report 148) - 215
    The National Emission Model for Agriculture (NEMA) is used to calculate emissions to air from agricultural activities in the Netherlands on a national scale. Emissions of ammonia (NH3) and other N compounds (NOx and N2O) are calculated for animal housing, manure storage, manure application and grazing using a flow model for total ammoniacal nitrogen (TAN). Emissions from the application of inorganic N fertilizer, compost and sewage sludge, cultivation of organic soils, crop residues, and ripening of crops are calculated as well. The NEMA is also used to estimate emissions of methane (CH4) from enteric fermentation and manure management, nonmethane volatile organic compounds (NMVOC) and particulate matter (PM) from manure management and agricultural soils, as well as for carbon dioxide (CO2) from liming. Emissions are calculated in accordance with the criteria of international guidelines and reported in an annual Informative Inventory Report (IIR; for air pollutants) and National Inventory Report (NIR; for greenhouse gases). This methodology report provides an outline of and describes the background to the calculation of emissions according to the NEMA.
    Cosmetische aspecten in specifieke handelsnormen voor groenten en fruit : : gevolgen voor de markt en voedselverspilling van het afschaffen van cosmetische aspecten in de EU-handelsnormen
    Oosterkamp, Elsje ; Sluis, Addie van der; Geffen, Lisanne van; Aramyan, Lusine ; Bos-Brouwers, Hilke - \ 2019
    Wageningen : Wageningen Economic Research (Nota Wageningen Economic Research 2018-040) - 27
    Weinig verandering in begrotingsrichtlijnen appel en peer : Prijsontwikkeling appels en peren
    Sluis, B.J. van der; Groot, M.J. - \ 2019
    De Fruitteelt (2019)3. - ISSN 0016-2302 - p. 17 - 19.
    The impact of European landscape transitions on the provision of landscape services: an explorative study using six cases of rural land change
    Sluis, T. van der; Pedroli, G.B.M. ; Frederiksen, Pia ; Kristensen, S.B.P. ; Gravsholt Busck, Anne ; Pavlis, V. ; Cosor, G.L. - \ 2019
    Landscape Ecology 34 (2019)2. - ISSN 0921-2973 - p. 307 - 323.
    The reasons for recent landscape change in the European countryside are complex and poorly substantiated. Identification of drivers of landscape
    transition and assessment of the effects on the provision of landscape services are subject of recent debate. Objectives Aims of the paper are to explore what
    implications rural landscape transitions (as identified by land use and land cover changes) have for the provision of landscape services, and whether these
    changes can be related to specific drivers of change. Methods The paper records gross landscape change on the basis of land use and land cover changes in six case study areas in five countries, and assesses the impacts on the provision of landscape services in the past 25 years. Results In the past decades the observed land use and land cover changes in the case studies are relatively small, with a dominance of urbanisation and afforestation processes. However, the impacts of these changes are clearly reflected in a change in landscape services. Conclusions Although the landscape transitions do affect the services, spatial data alone is insufficient to assess cause-effect relationships of landscape transitions, landscape structure and pattern. Circumstantial evidence points to substantial effects of EU and national policies on landscape services through landscape transition. These—often unintentional—effects can substantially affect biodiversity, cultural identity and landscape character. More research is needed on the exact cause-effect relationships between policies and landscape service provision.
    Discovery of Sabellaria spinulosa reefs in an intensively fished area of the Dutch Continental Shelf, North Sea
    Reijden, Karin J. Van Der; Koop, Leo ; O'flynn, Sarah ; Garcia, Silvia ; Bos, Oscar ; Sluis, Christiaan van; Maaholm, David J. ; Herman, Peter M.J. ; Simons, Dick G. ; Olff, Han ; Ysebaert, Tom ; Snellen, Mirjam ; Govers, Laura L. ; Rijnsdorp, Adriaan D. ; Aguilar, Ricardo - \ 2019
    Journal of Sea Research 144 (2019). - ISSN 1385-1101 - p. 85 - 94.
    Biogenic Reef - Brown Bank - Ecosystem Engineer - Sabellaria spinulosa - North Sea
    The tube-building polychaete Sabellaria spinulosa (Ross worm) can form conspicuous biogenic reefs that stabilize the seabed and increase biodiversity by providing a habitat for a multitude of other species. These reefs, however, are assumed to be vulnerable to human-induced physical disturbances of the seabed. In the Greater North Sea, S. spinulosa reefs are recognized to be under threat and worthy of protection. In August 2017, three S. spinulosa reefs with a minimum extent of 1016m2 were discovered in the Dutch Brown Bank area. This area comprises a large-scale sandbank and adjacent troughs. The reefs were found within the sandbank troughs, which have proven to be subject to high demersal fishing intensities (fished>5 times a year). Detailed bathymetry measurements showed that S. spinulosa reefs were mainly located within valleys of smaller-scaled sand waves, which have a perpendicular orientation compared to the large-scale sandbank structure of the Brown Bank. We hypothesize that the valleys in between sand waves offer suitable substrate for settlement and refuge from abrasion by fishing activities, enabling the S. spinulosa reefs to persist despite high fishing intensities. ROV footage of the reefs showed higher estimates of species abundances on the reefs compared with adjacent habitats, with some species present that are typical for hard substrate (rock gunnel, Pholis gunnellus; edible crab, Cancer pagurus; and velvet swimming crab, Necora puber). The information presented could be used for drafting management policies to protect these reefs, as Contracting Parties of the OSPAR Convention are committed to take measures and protect biodiversity.
    Syntheserapport PMR NCV
    Tulp, I. ; Prins, T.C. ; Craeymeersch, J.A.M. ; IJff, S. ; Sluis, M.T. van der - \ 2018
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C014/18) - 282
    In dit Syntheserapport worden de relevante bevindingen uit het onderzoek en de monitoring binnen het monitorings- en onderzoeksprogramma PMR NCV gecombineerd om tot een eenduidig antwoord te komen op een aantal onderzoeksvragen. Bij aanvang van het monitoringprogramma van PMR-NCV in 2009 zijn in het Monitoring- en Evaluatie Programma (MEP-NCV) de vragen geformuleerd waarop het monitoringprogramma van de natuurcompensatie een antwoord dient te geven. De synthese van de resultaten en het onderliggende monitoring en onderzoek is uitgevoerd door een consortium onder leiding van Wageningen Marine Research en Deltares. Het doel van de monitoring van de natuurcompensatie in de Voordelta is om antwoord te kunnen geven op de vraag of, middels extra bescherming in de vorm van visserij beperkende maatregelen en de instelling van extra rustgebieden voor zwarte zee-eenden en sterns, voldoende wordt gecompenseerd voor de destijds voorspelde significante effecten als gevolg van de aanleg en aanwezigheid van Maasvlakte 2.
    Direct and indirect drivers of change in biodiversity and nature's contributions to people
    Sluis, T. van der; Elbakidze, M. ; Hahn, T. ; Zimmermann, N.E. ; Cudlín, P. ; Friberg, N. ; Genovesi, P. ; Helm, A. ; Jonsson, B. ; Lengyel, S. ; Leroy, B. ; Luzzati, T. ; Milbau, A. ; Pérez-Ruzafa, A. ; Roche, P. ; Roy, H. ; Sabyrbekov, R. ; Vanbergen, A. ; Vandvik, V. - \ 2018
    In: The regional assessment report on Biodiversity and Ecosystem Services for Europe and Central Asia / Rounsevell, Mark, Fischer, Markus, Torre-Marin Rando, Amor, Mader, André, - p. 390 - 568.
    Radiofrequency identification systems: Advantages and constraints for tracking and monitoring of individual animals
    Sluis, M. van der; Ellen, E.D. ; Haas, Y. de; Rodenburg, T.B. - \ 2018
    In: Measuring behavior 2018. - Manchester : - ISBN 9781910029398 - p. 193 - 195.
    To track and monitor individual animals in groups, it is possible to use radiofrequency identification (RFID) systems. RFID encompasses all wireless communication systems that use radiofrequency fields [1]. RFID systems consist of tags and readers [2]. The tags contain unique identification data and can be attached to the item or, in the proposed application, to the animal that needs to be tracked [2]. The readers are used to read and identify the tags via radiofrequency fields [2]. The development of RFID technology started in the late 1960s and RFID systems are currently used for a large range of applications, including electronic door locking systems, contactless smart cards, and animal identification [2,3,4]. Further progress in the technology of chip manufacturing now makes RFID suitable for novel applications and available at a lower cost [4,5]. Therefore, the existing RFID technology may be applicable for animal tracking and monitoring as well. Here, different types of RFID systems will first be discussed for their applicability in individual animal tracking and monitoring, after which future work using RFID to track individual animals will be presented.
    Report on a prioritised list of habitats and emblematic species in the framework of Action 12 of the Nature Action Plan
    Sluis, T. van der; Bouwma, I.M. ; Condé, S. - \ 2018
    Paris, France : European Topic Centre Biological Diversity (ETC/BD Working paper N° A/2018) - 38 p.
    Using sensor technologies in animal breeding: reducing damaging behaviour of animals kept in groups
    Ellen, E.D. ; Sluis, M. van der; Haas, Y. de; Rodenburg, T.B. - \ 2018
    In: Measuring behavior 2018. - Manchester : - ISBN 9781910029398 - p. 181 - 182.
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