Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    '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 

    Current refinement(s):

    Records 1 - 20 / 115

    • help
    • print

      Print search results

    • export

      Export search results

    Check title to add to marked list
    Honey bee colony winter loss rates for 35 countries participating in the COLOSS survey for winter 2018–2019, and the effects of a new queen on the risk of colony winter loss
    Gray, Alison ; Adjlane, Noureddine ; Arab, Alieza ; Ballis, Alexis ; Brusbardis, Valters ; Charrière, Jean Daniel ; Chlebo, Robert ; F. Coffey, Mary ; Cornelissen, A.C.M. ; Amaro da Costa, Cristina ; Brodschneider, Robert - \ 2020
    Journal of Apicultural Research (2020). - ISSN 0021-8839
    apis mellifera - Mortality - colony winter losses - queens - queen replacement - monitoring - surveys - beekeeping - citizen science
    This article presents managed honey bee colony loss rates over winter 2018/19 resulting from using the standardised COLOSS questionnaire in 35 countries (31 in Europe). In total, 28,629 beekeepers supplying valid loss data wintered 738,233 colonies, and reported 29,912 (4.1%, 95% confidence interval (CI) 4.0–4.1%) colonies with unsolvable queen problems, 79,146 (10.7%, 95% CI 10.5–10.9%) dead colonies after winter and 13,895 colonies (1.9%, 95% CI 1.8–2.0%) lost through natural disaster. This gave an overall colony winter loss rate of 16.7% (95% CI 16.4–16.9%), varying greatly between countries, from 5.8% to 32.0%. We modelled the risk of loss as a dead/empty colony or from unresolvable queen problems, and found that, overall, larger beekeeping operations with more than 150 colonies experienced significantly lower losses (p < 0.001), consistent with earlier studies. Additionally, beekeepers included in this survey who did not migrate their colonies at least once in 2018 had significantly lower losses than those migrating (p < 0.001). The percentage of new queens from 2018 in wintered colonies was also examined as a potential risk factor. The percentage of colonies going into winter with a new queen was estimated as 55.0% over all countries. Higher percentages of young queens corresponded to lower overall losses (excluding losses from natural disaster), but also lower losses from unresolvable queen problems, and lower losses from winter mortality (p < 0.001). Detailed results for each country and overall are given in a table, and a map shows relative risks of winter loss at regional level.
    Assessment of Dickeya and Pectobacterium spp. on vegetables and ornamentals (Soft rot)
    Wolf, J.M. van der; Bergsma-Vlami, M. ; Saddler, G. ; Hélias, V. ; Tsror, L. ; Yedida, Iris ; Pirhonen, M. ; Degefu, Yeshtila ; Tuomisto, J.T. ; Lojkowska, Ewa ; Li, Sean - \ 2020
    Zenodo - 109 p.
    Euphresco - Plant health - Dickeya - Pectobacterium - soft rot - vegetables - ornamentals - diagnostics - surveys - epidemiology - management
    Dickeya and Pectobacterium belonging to the group of soft rot Pectobacteriaceae (SRP) are causing emerging problems in a wide range of vegetable and ornamental crops in Europe, including potato, carrot, cabbage, Chinese cabbage, celery, leek, pepper, parsley, Zantedeschia, hyacinth, Dahlia, Chrysanthemum, Philodendron, Freesia, Saintpaulia, Iris, Aglaonema, Crocus, Campanula and Phalaenopsis. The phytopathogens in both genera are genetically and phenotypically highly diverse. Disease problems in the different hosts are associated with the introduction of new variants or by spread of groups already present in Europe. Within this Euphresco project we aimed to identify and assess the risks of these new variants, and to develop management strategies, including reliable diagnostic methods to prevent introductions and further spread of SRP. To reach our goals, meetings were organized and collaborations were established with specialists worldwide. All information on meetings, protocols and activities of the Euphresco group are published on the Dickeya/Pectobacterium website, conveyed by the James Hutton Institute in Invergowrie (Scotland) (, contact person Dr I. Toth/Dr J. Fairly).

    During the project, 1.5 days meetings were held in 2015 in Gdansk (Poland), in 2016 in Helsinki (Finland), in 2017 in Edinburgh (Scotland) and in 2018 in Emmeloord (The Netherlands). Meetings were attended by an average of 30 participants from organizations in EU member states, North- and Latin America, Africa, Asia and Australia.

    One project’s objective was to develop methods for the detection and identification of Pectobacterium and Dickeya species in different matrices. For this, a panel of reference strains has been compiled for Dickeya and Pectobacterium species. Most strains have been deposited in international collections. For most strains also whole genome sequence data are available. During the course of this project, several diagnostic tests were developed and evaluated, often based on the TaqMan technology.

    In several countries, surveys in potato and ornamental crops were conducted, but also in other matrices of the potato ecosystem, including water used for irrigation. In addition, new taxonomic groups that have been identified, are now new species including: P. versatile, P. aquaticum, P. fontis and P. polonicum. In potato, P. brasiliense became dominant as blackleg causing organism and has largely outcompeted D. solani in the last five years. In surface water in Europe, D. zeae was found to be the dominant SRP. In other continents, serious outbreaks of potato blackleg with other SRP has been reported, such as D. dianthicola in the USA and Australia. Various new SRP have been described, namely P. punjabense, P. peruviense, P. polaris, D. lacustris and D. zantedeschia. For the first time, D. fangzhongdai was described in Phalaenopsis. Not all species can cause potato blackleg.

    Studies on various virulence factors were conducted for SRP, such as on chemoreceptors, small phenolic plant compounds interacting with signal molecules of Pectobacterium involved in the quorum sensing mechanism of the pathogen. A Tn-seq approach was developed and used to identify new virulence factors.

    Information was exchanged on disease management strategies which include cultivation practices, resistance breeding, hygiene and the use of (bio-) control agents. A strict hygiene and an intensive monitoring of seed lots was found to be associated with a significant reduction of infections with blackleg causing SRP. A phage therapy has been developed to protect (seed) potato tubers against soft rot during storage. Various bacteriophages and bacterial antagonists were characterized and some evaluated for control of potato soft rot and/or blackleg. Steam treatments for seed tubers were found to decrease the blackleg incidence. Cold plasma treatment was found to kill SRP grown in vitro. Similarly, stabilized silver nanostructures killed SRP. It was found that seed potato lots can differ in suppressiveness against D. solani. Indications were found that the microbiome in tuber tissue plays a role in this.
    Sea floor litter monitoring : International Bottom Trawl Survey 2016
    Hal, Ralf van - \ 2017
    Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C021/17) - 60
    litter - environmental monitoring - marine environment - marine sediments - surveys - north sea - ligstro - milieumonitoring - marien milieu - mariene sedimenten - karteringen - noordzee
    The Marine Strategy Framework Directive (MSFD) requires the European Member States to develop programmes of measures to achieve or maintain Good Environmental Status (GES) in European Seas. To be able to evaluate the quality state of the marine waters on a regular basis and the effect of measures taken, monitoring programs for MSFD descriptors and indicators have been established by the Member states. GES is described by 11 descriptors, and marine litter is one of them. The Dutch monitoring program for this descriptor includes amongst others the collection of data on the presence, abundance and distribution of litter on the seafloor. According to the Dutch program, the data on seafloor litter must be collected by statutory task fish surveys using standardized GOV fishing net, as a part of the International Bottom Trawl Survey (IBTS). This report presents the results of the seafloor litter monitoring during the IBTS survey of Quarter 1 2016. Seafloor litter data is collected annually during this survey since 2013, and the new data is presented in perspective of the data collected in previous years. This is done for the composition and the spatial distribution of the seafloor litter from the catch. The composition of the litter collected in 2016 is similar compared to earlier years; plastic and specifically rope/lines are the most dominant litter items found. The survey was again carried out on board the UK vessel CEFAS Endeavour, and the standard Dutch IBTS area including the Channel area was covered. Even though, due to a survey design based on random sampling within ICES rectangles, comparison in spatial distribution of litter as well as in estimates of the amount of litter between years is difficult. The spatial distribution of the litter seems random with small and large catches close to each other. It might be a result of small probability of actually catching litter items with a GOV trawl not designed for this purpose, or by differences in seafloor structure. It is possible to register additional habitat information and use this information in the data analysis After four years of litter sampling as part of the IBTS, inconsistencies in categorising the litter items are still found between national observers. In 2015 and 2016, close cooperation with CEFAS staff showed that these inconsistencies also exist between countries. The inconsistencies exist for a small number of subcategories, for which there is some arbitrary in how to divide items between them. Analysing the Dutch IBTS data by itself indicates a number of limitations, e.g. the spatial differences owing to a semi-randomized survey design between years, which could be overcome by combining the international data of the IBTS. This data can be found in the database developed and accessible via the ICES datacentre and combining the data is done within OSPAR.
    Atlantic mackerel and Horse mackerel egg survey 2016: Dutch participation on board FV Atlantic Lady: May
    Damme, C.J.G. van - \ 2016
    IMARES (Report / IMARES C077/16) - 30
    mackerels - trachurus trachurus - scomber scombrus - fish eggs - censuses - surveys - makrelen - trachurus trachurus - scomber scombrus - visseneieren - tellingen - karteringen
    From 10 till 25 May 2016 IMARES carried out a mackerel and horse mackerel egg survey on board the FV Atlantic Lady. This survey was part of the international mackerel and horse mackerel egg survey coordinated by ICES. The Redersvereniging voor de Zeevisserij (RVZ) asked IMARES to carry out this survey. Numbers of mackerel eggs in the samples were low, lower compared to previous surveys. Most mackerel eggs were found along the 200m depth contour of the continental slope. Most of the adult mackerel had running or newly developing (in between batches) gonads. Few mackerel had gonads which were spent. Numbers of horse mackerel eggs were extremely low. A few horse mackerel eggs were found along the 200m depth contour on the most southern transects. Adult horse mackerel caught had running or newly developing gonads.
    Estimating a conversion factor for the gears used in the industry survey
    Hal, R. van; Reijden, K.J. van der - \ 2016
    IJmuiden : IMARES (Report / IMARES C004/16) - 35
    dover soles - plaice - fishing vessels - fishing gear - conversion - surveys - fish stocks - fishery management - fishery resources - north sea - tong (vis) - schol - vissersschepen - vistuig - conversie - karteringen - visstand - visserijbeheer - visbestand - noordzee
    North Sea Herring and Pelagic Ecosystem Survey (HERAS) report for R/V "TRIDENS" 22 June - 17 July 2015
    Couperus, A.S. ; Fassler, S.M.M. ; Scoulding, B.C. - \ 2015
    IJmuiden : IMARES (Report / IMARES 15.015) - 30
    herrings - surveys - fish stocks - marine fisheries - acoustic tracking - fishery resources - north sea - haringen - karteringen - visstand - zeevisserij - akoestisch sporen - visbestand - noordzee
    Dynamiek van schelpdierbanken in de nederlandse kustzone
    Kamermans, P. ; Goudswaard, P.C. ; Asch, M. van; Bos, O.G. - \ 2015
    Yerseke : IMARES (Rapport / IMARES C186/15) - 31
    schaaldieren - dynamica - aquatische ecosystemen - kustgebieden - kustwateren - karteringen - nederland - shellfish - dynamics - aquatic ecosystems - coastal areas - coastal water - surveys - netherlands
    VIP Report Acoustic Data Collection
    Fassler, S.M.M. ; Brunel, T.P.A. ; Couperus, A.S. ; Gastauer, S. ; Burggraaf, D. - \ 2015
    IJmuiden : IMARES (Report / IMARES C178/15) - 121
    herrings - whiting - marine fisheries - fish stocks - fishery resources - fishery management - fishing vessels - acoustic tracking - surveys - haringen - wijting - zeevisserij - visstand - visbestand - visserijbeheer - vissersschepen - akoestisch sporen - karteringen
    Marine mammal surveys in Dutch North Sea waters in 2015
    Geelhoed, S.C.V. ; Lagerveld, S. ; Verdaat, J.P. - \ 2015
    Den Helder : IMARES (Report / IMARES C189/15) - 21
    marine mammals - surveys - north sea - netherlands - aquatic ecology - zeezoogdieren - karteringen - noordzee - nederland - aquatische ecologie
    Survey van watervogels in het Malzwin, 2013 - 2014
    Smit, C.J. ; Meijboom, A. - \ 2015
    Den Burg : IMARES (Rapport / IMARES Wageningen UR C101/15) - 47
    watervogels - vogels - karteringen - waddenzee - militaire gebieden - waterfowl - birds - surveys - wadden sea - military areas
    Het Ministerie van Defensie streeft ernaar dat militaire activiteiten in het Waddengebied een zo gering mogelijk effect op natuurwaarden hebben. Dit geldt ook voor oefeningen met militaire helikopters in de omgeving van Marinevliegkamp De Kooy. Door het Ministerie wordt dan ook gezocht naar mogelijkheden om de noodzakelijk geachte activiteiten te concentreren in een relatief beschut gelegen gebied waar effecten op natuurwaarden zo klein mogelijk zijn. Eén van deze gebieden is een locatie in het Malzwin, ten noorden van het Balgzand. In deze rapportage wordt aan de hand van een reeks maandelijkse tellingen aangegeven welke vogelsoorten in welke aantallen in dit gebied aanwezig zijn.
    Veldrapportage vogelwaarnemingen bij drone-opnamen Koehoal-Westhoek
    Baptist, M.J. - \ 2015
    Den Burg : IMARES (Rapport / IMARES ) - 14
    vogels - drones - karteringen - inventarisaties - observatie - verstoring - waddenzee - birds - drones - surveys - inventories - observation - disturbance - wadden sea
    Op 19 augustus 2015 zijn vogelwaarnemingen verricht tijdens de inzet van een drone boven Natura2000 gebied Waddenzee. De drone werd ingezet voor het maken van orthogonale luchtfoto’s waarmee door middel van fotogrammetrie een digitaal terreinmodel gemaakt kan worden. Uit de in dit rapport gepresenteerde gegevens van drone-opnamen boven Natura2000-gebied Waddenzee is niet gebleken dat er verstoring van vogels is opgetreden. Echter, er kan niet worden uitgesloten dat geen enkele vogel zich verstoord voelde door de aanwezigheid van de drone. In termen van instandhoudingsdoelstellingen voor de Waddenzee kan wel worden uitgesloten dat er significante effecten op de populatie-omvang van beschermde vogels is opgetreden.
    From the Sugar Platform to biofuels and biochemicals : Final report for the European Commission Directorate-General Energy
    Taylor, R. ; Nattrass, L. ; Alberts, G. ; Robson, P. ; Chudziak, C. ; Bauen, A. ; Libelli, I.M. ; Lotti, G. ; Prussi, M. ; Nistri, R. ; Chiaramonti, D. ; lópez-Contreras, A.M. ; Bos, H.L. ; Eggink, G. ; Springer, J. ; Bakker, R. ; Ree, R. van - \ 2015
    E4tech/Re-CORD/Wageningen UR - 183
    chemie op basis van biologische grondstoffen - chemicaliën uit biologische grondstoffen - gevalsanalyse - suiker - chemische industrie - europa - karteringen - biobased economy - biobased chemistry - biobased chemicals - case studies - sugar - chemical industry - europe - surveys - biobased economy
    Numerous potential pathways to biofuels and biochemicals exist via the sugar platform1. This study uses literature surveys, market data and stakeholder input to provide a comprehensive evidence base for policymakers and industry – identifying the key benefits and development needs for the sugar platform. The study created a company database for 94 sugar-based products, with some already commercial, the majority at research/pilot stage, and only a few demonstration plants crossing the “valley of death”. Case studies describe the value proposition, market outlook and EU activity for ten value chains (acrylic, adipic & succinic acids, FDCA, BDO, farnesene, isobutene, PLA, PHAs and PE). Most can deliver significant greenhouse savings and drop-in (or improved) properties, but at an added cost to fossil alternatives. Whilst significant progress has been made, research barriers remain around lignocellulosic biomass fractionation, product separation energy, biological inhibition, chemical selectivity and monomer purity, plus improving whole chain process integration. An assessment of EU competitiveness highlights strengths in R&D, but a lack of strong commercial activity, due to the US, China and Brazil having more attractive feedstock and investment conditions. Further policy development, in particular for biochemicals, will be required to realise a competitive European sugar-based bioeconomy.
    Populatieschatting geiten op Bonaire
    Lagerveld, S. ; Debrot, A.O. ; Bertuol, P. ; Davaasuren, N. ; Neijenhuis, F. - \ 2015
    Den Helder : IMARES (Rapport / IMARES Wageningen UR C115/15) - 48
    geiten - tellingen - karteringen - bonaire - goats - censuses - surveys - bonaire
    Op basis van 75 lijntransecten van 500 m worden in dit verslag de eerste kwantitatieve schattingen gedaan van het geitenbestand van Bonaire. Deze transecten werden met behulp van het programma Distance 6.2 via een ‘random systematic design’ over het eiland verdeeld. Het veldonderzoek heeft plaatsgevonden in de periode 6 - 13 december 2014.
    Methods for integrated use of fisheries research survey information in understanding marine fish population ecology and better management advice : improving methods for evaluation of research survey information under consideration of survey fish detection and catch efficiency
    Nielsen, J.R. - \ 2015
    Wageningen University. Promotor(en): Adriaan Rijnsdorp. - Wageningen : Wageningen University - ISBN 9789462572553 - 187
    zeevisserij - onderzoek - karteringen - visserijbeheer - zeevissen - populatie-ecologie - evaluatie - methodologie - visvangsten - visbestand - visserijbiologie - marine fisheries - research - surveys - fishery management - marine fishes - population ecology - evaluation - methodology - fish catches - fishery resources - fishery biology


    The thesis developed and improved methods for the integrated analysis of different types of fishery independent research surveys (trawl surveys, acoustic surveys, hydrographical surveys, and gillnet surveys) to study the distribution, density, abundance, migration and biological population dynamic parameters of marine fish species. The topics in the thesis addressed different combinations of trawl, hydro-acoustic, gillnet, and hydrographical data and application of different survey data analysis methods under consideration of factors influencing the survey catch and detection efficiency. Each topic was investigated in one of more case studies.

    One thesis topic has been to provide more precise estimates of fish distribution and density patterns from survey data (Chapter 2). The 1st case study applied advanced statistical methods to Baltic trawl data and hydro-acoustic survey data in combination with survey sampled hydrographical data to estimate distri­bution and density patterns of juvenile 0-group Baltic cod. These patterns were largely unknown. In the 2nd case study new methodology was developed for analyzing trawl research survey data for Baltic cod and whiting including the corre­la­tion in distribution and density according to space, time, size, and species. The more precise density estimates improve the knowledge of the stock-recruitment relationship of Baltic cod and can improve the Baltic multi-species stock assessment. Furthermore, it will enable more precise marine management and spatial planning involving fish stocks and fisheries in the Baltic Sea. In context of Baltic cod stock assessment, the 3rd case study developed a new method for inter-calibration of trawl survey CPUE data by fish size group exemplified by Baltic cod (and flounder) where the concept of disturbance by one trawl haul in relation to the next have been developed and quantified when calibrating new research survey trawl gears with the former ones. These results have been based on introduction of a new international ICES BITS trawl research survey design.

    A second topic was to improve and develop hydroacoustic research survey methods for more precise detection and discrimination of fish species according to fish size and orientation in the water (Chapter 3). Here, the 4th case study focused on more precise acoustic target strength estimation of juvenile cod, while the 5th case study has focused on acoustic discrimination of juvenile gadoid fish in particular juvenile Baltic cod. This enables more efficient research survey estimation of juvenile cod (gadoid) density patterns to be used in stock recruitment estimates and stock assessment.

    The third topic was to estimate more precisely fish mortality, maturity, and growth parameters for small forage fish species using research survey information (Chapter 4). Associated to this, the 5th case study analysed these population dynamic parameters using trawl survey data taking into account spatial variation. This study provided more precise estimates and deeper understanding of Norway pout mortality, maturity, and growth dynamics. The more precise population dynamic parameters have been implemented in and improved the North Sea Norway pout stock assessment, management advice, management, and long term management plan evaluations.

    The fourth topic was to develop methodology to integrate hydroacoustic, gillnet, and hydro­gra­phi­cal research survey data to investigate pelagic fish migration patterns (Chapter 5). The methods were applied in the 6th case study to evaluate Western Baltic herring feeding and spawning migra­tion based on distribution and density estimates in a narrow over-wintering area of the stock. The more precise information on migration patterns gives better possibility for acoustic monitoring of the full stock abundance in different areas and seasons og the year to be used in stock assessment and marine spatial planning. Also, it increases knowledge on biological interactions and mixing with other stocks and species.  

    In the final synthesis Chapter 6, the thesis reviews relevant analysis methods of research survey data and underlying data distributions, survey design and stratification, trawl survey inter-calibration and standardization, as well as estimation procedures and data processing methods in context of the obtained results and methods developed in the thesis. This is done with focus on survey precision and uncertainty (bias, sources of errors) for trawl and acoustic surveys and factors affecting it.





    North Sea hydro acoustic herrng survey Survey report for R/V TRIDENS 23 June - 18 July 2014
    Fassler, S.M.M. - \ 2014
    IJmuiden : IMARES (Internal report / IMARES Wageningen UR 14.005) - 28
    haringen - noordzee - karteringen - akoestisch sporen - visbestand - pelagische visserij - gegevens verzamelen - eu regelingen - herrings - north sea - surveys - acoustic tracking - fishery resources - pelagic fishery - data collection - eu regulations
    The Dutch Institute for Marine Resources & Ecosystem Studies (IMARES) has been participating in the international North Sea acoustic survey for herring since 1991. Participants in this survey are Scotland, Norway, Germany, Denmark, The Netherlands and Ireland. The survey is part of the EU data collection framework (DCF) and is coordinated by the ICES Working Group for International Pelagic Surveys (WGIPS, formerly PGIPS/PGHERS). The aim of this survey is to provide an abundance estimate of the whole North Sea herring population. This estimate is used as a tuning index by the ICES Herring Assessment Working Group (HAWG) in its assessment of the population size. In this report the results are presented for the survey in the central North Sea, carried out by the Dutch vessel R/V Tridens.
    Met vlas naar een biobased economie: omgeving Enschede
    Coninx, I. ; Vries, E.A. de; Agricola, H.J. ; Doorn, A.M. van; Spijkerman, A. ; Elbersen, B.S. ; Kranendonk, R.P. - \ 2014
    Wageningen : Alterra, Wageningen-UR - 38
    vlas - vezelgewassen - olieleverende planten - twente - regionale ontwikkeling - regionale economie - karteringen - agro-industriële ketens - materialen uit biologische grondstoffen - biobased economy - flax - fibre plants - oil plants - twente - regional development - regional economics - surveys - agro-industrial chains - biobased materials - biobased economy
    Al zoekende naar hernieuwbare grondstoffen om producten te ontwikkelen wordt duidelijk dat vlas heel wat potenties biedt. Een aantal partijen in en rondom Enschede is daar alvast van overtuigd en klaar voor de volgende stap: een biobased vlascluster ontwikkelen in omgeving Enschede. Het Ministerie van Economische Zaken is enthousiast over deze ambitie en wil met dit onderzoek de partijen een steun in de rug geven om de volgende stap te maken. Concreet is het onderzoek gericht op de volgende vragen: - Is het mogelijk om een schaalsprong te maken in vlasteelt in omgeving Enschede ten behoeve van de biobased productontwikkeling in de regio? - En zo ja, welke instrumenten kunnen daartoe ingezet worden? Over deze vragen bundelt deze notitie een grote hoeveelheid van beschikbare informatie om de partijen te helpen om tot focus te komen. Ook worden aanbevelingen gemaakt over de route die bewandeld kan worden om de biobased vlascluster te realiseren, zoals welke acties en projecten gerealiseerd moeten worden, alsook welke financieringsinstrumenten beschikbaar zijn om deze acties te realiseren. Ook geven we suggesties over een organisatiestructuur die deze vlascluster kan realiseren.
    Reisverslag IBTS-Q1 2014
    Hal, R. van - \ 2014
    IJmuiden : IMARES (Rapport / IMARES Wageningen UR C087/14) - 37
    zeevissen - visstand - visbestand - karteringen - noordzee - marine fishes - fish stocks - fishery resources - surveys - north sea
    Het primaire doel van de International Bottom Trawl Survey (IBTS) is het verkrijgen van recruitmentindices van kabeljauw, schelvis, wijting, kever, makreel, koolvis, haring en sprot in de Noordzee, Skagerrak en Kattegat. Daarnaast worden de gegevens gebruikt als “tuning-series” voor de bestandsschattingen van de commerciële soorten.
    Feasibility of a Dutch Nephrops survey - KBWOT 2013 Get the picture
    Marlen, B. van; Haan, D. de - \ 2014
    IJmuiden : IMARES (Rapport / IMARES Wageningen UR C203/13) - 61
    nephrops norvegicus - karteringen - visserijbeheer - visstand - monitoring - bemonsteren - nephrops norvegicus - surveys - fishery management - fish stocks - monitoring - sampling
    The wish was expressed in the Netherlands to set up a Nephrops survey. Such surveys are carried out in other ICES member countries, e.g. the UK, Ireland, Denmark. Contacts were made with experts from these countries and IMARES participated in ICES WGNEPS in 2013 to retrieve information on the procedures and instrumentation used. A standard technique is to use a UWTV-sledge with cameras to count Nephrops burrows and estimate abundance. A UWTV-survey is preferred over a survey using a headline unit on commercial fishing gears. It will supply a fisheries independent abundance estimate, and has developed into a standard method within ICES. Aspects of methodology and technology are reviewed in the report.
    Verslag bedrijfssurvey 2013
    Rasenberg, M.M.M. ; Machiels, M.A.M. ; Nijman, R.R. ; Wiegerinck, J.A.M. ; Rink, G.J. - \ 2014
    IJmuiden : IMARES (Rapport / IMARES Wageningen UR C010/14) - 26
    tong (vis) - schol - visbestand - visserij - karteringen - bemonsteren - noordzee - dover soles - plaice - fishery resources - fisheries - surveys - sampling - north sea
    De bestandsschattingen van schol en tong zijn onder andere gebaseerd op de gegevens van wetenschappelijke onderzoekssurveys uitgevoerd door IMARES. De visserijsector heeft regelmatig kritiek geuit op de manier waarop deze gegevens verzameld worden. Deze kritiekpunten worden door de sector en IMARES gezamenlijk opgepakt binnen de bedrijfssurvey, met als een van de doelen dat vissers meer vertrouwen in bestandsschattingen krijgen. De bedrijfssurvey is een gezamenlijk onderzoek van de visserijsector en IMARES naar ontwikkelingen in de tong- en scholstand in de Noordzee. De bedrijfssurvey levert extra gegevens op van schol en tong, welke gebruikt kunnen gaan worden voor bestandsschattingen. Ze kunnen hiervoor pas worden gebruikt nadat een datareeks van 5 jaar is opgebouwd. Deze rapportage gaat over het derde jaar van de bedrijfssurvey. In deze rapportage evalueren we de survey en beschrijven we de resultaten.
    Biomassahubs in de regio Emmen - Coevorden
    Smakman, G.J.J. ; Annevelink, E. - \ 2013
    Lelystad : PPO-AGV - ACRRES - 58
    logistiek - biomassa - biomassa cascadering - karteringen - terminalfaciliteiten - regionale ontwikkeling - haalbaarheidsstudies - industriële grondstoffen - ketenmanagement - biobased economy - drenthe - logistics - biomass - biomass cascading - surveys - terminal facilities - regional development - feasibility studies - feedstocks - supply chain management - biobased economy - drenthe
    Doelstelling van deze verkenning is om aan te geven welke kansen er liggen voor een of meerdere biomassahubs, hoe deze eruit zouden kunnen zien en op welke manier deze zouden kunnen bijdragen aan het tot stand komen van regionale activiteiten op het gebied van de biobased economy. De biomassahub verbindt de leveranciers van biogene grondstoffen met de verwerkende industrie, door deze grondstoffen aan te leveren op een manier dat de industrie ze rechtstreeks en op een efficiënte manier kan toepassen in hun halffabricaten of eindproducten. De biomassahub kent verschillende uitvoeringsvormen, afhankelijk van de vraag en aanbod van biogene producten. Een belangrijk kenmerk van de biomassahub is de mogelijkheid om door middel van raffinagetechnieken ruwe grondstoffen te splitsen in componenten en deze allemaal een nuttige toepassing te bieden, waardoor (vrijwel) geen onbruikbare restproducten meer voorkomen.
    Check title to add to marked list
    << previous | next >>

    Show 20 50 100 records per page

    Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.