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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Large-scale GWAS identifies multiple loci for hand grip strength providing biological insights into muscular fitness
Willems, Sara M. ; Wright, D.J. ; Day, Felix R. ; Trajanoska, Katerina ; Joshi, P.K. ; Morris, John A. ; Matteini, Amy M. ; Garton, Fleur C. ; Grarup, Niels ; Oskolkov, Nikolay ; Thalamuthu, Anbupalam ; Mangino, Massimo ; Liu, Jun ; Demirkan, Ayse ; Lek, Monkol ; Xu, Liwen ; Wang, Guan ; Oldmeadow, Christopher ; Gaulton, Kyle J. ; Lotta, Luca A. ; Miyamoto-Mikami, Eri ; Rivas, Manuel A. ; White, Tom ; Loh, Po Ru ; Aadahl, Mette ; Amin, Najaf ; Attia, John R. ; Austin, Krista ; Benyamin, Beben ; Brage, Søren ; Cheng, Yu Ching ; Ciȩszczyk, Paweł ; Derave, Wim ; Eriksson, Karl Fredrik ; Eynon, Nir ; Linneberg, Allan ; Lucia, Alejandro ; Massidda, Myosotis ; Mitchell, Braxton D. ; Miyachi, Motohiko ; Murakami, Haruka ; Padmanabhan, Sandosh ; Pandey, Ashutosh ; Papadimitriou, Ioannis ; Rajpal, Deepak K. ; Sale, Craig ; Schnurr, Theresia M. ; Sessa, Francesco ; Shrine, Nick ; Groot, Lisette C.P.G.M. De - \ 2017
Nature Communications 8 (2017). - ISSN 2041-1723
Hand grip strength is a widely used proxy of muscular fitness, a marker of frailty, and predictor of a range of morbidities and all-cause mortality. To investigate the genetic determinants of variation in grip strength, we perform a large-scale genetic discovery analysis in a combined sample of 195,180 individuals and identify 16 loci associated with grip strength (P<5 × 10-8) in combined analyses. A number of these loci contain genes implicated in structure and function of skeletal muscle fibres (ACTG1), neuronal maintenance and signal transduction (PEX14, TGFA, SYT1), or monogenic syndromes with involvement of psychomotor impairment (PEX14, LRPPRC and KANSL1). Mendelian randomization analyses are consistent with a causal effect of higher genetically predicted grip strength on lower fracture risk. In conclusion, our findings provide new biological insight into the mechanistic underpinnings of grip strength and the causal role of muscular strength in age-related morbidities and mortality.
Local ecological knowledge (LEK) on fish behavior around anchored FADs : The case of tuna purse seine and ringnet fishers from Southern Philippines
Macusi, Edison D. ; Abreo, Neil A.S. ; Babaran, Ricardo P. - \ 2017
Frontiers in Marine Science 4 (2017)JUN. - ISSN 2296-7745
FADs - Fish aggregating devices - LEK - Payao - Philippines - Tuna

The Fishing Industry in the Philippines plays an important role in the food and employment need of Filipino fishers. By using anchored Fish Aggregating Devices (FADs or payao), the Philippine tuna fisheries was transformed into a million-dollar industry. Minimal studies on exploitation rates and fish behavior around anchored FADs hampered further understanding of this fishery practice. Studies on fish behavior using Local Ecological Knowledge (LEK) are good complement where data is limited. A study using semi-structured interview (n = 46) and three focus group discussions (n = 39 participants) to record fishers' knowledge and observations on the behavior of different fish species around anchored FADs was conducted. This particularly focused on attraction, retention, and departure behavior of fishes in identified FAD sites. Based on the fishers' knowledge, tuna schools are attracted to anchored FADs at 10 km distance. In anchored FADs, tuna form schools segregated by species and size. There was no relationship between the attraction distance and the reported school size and the various waiting times for fish to aggregate below the FADs. There was no variation between the species present at day or night time although fishers have reported a distinction of species found near the surface (0-10 m) and those found at other depths (11-20 m). Juvenile yellowfin tuna (Thunnus albacares), skipjack (Katsuwonus pelamis), and frigate and bullet tunas (Auxis spp.) are found to stay at 25-50 m from the FAD at a depth of >20 m. Adult oceanic tunas reside in deeper waters (75 m). The fish visual census produced similar results with the semi-structured interviews and FGDs but did not observe oceanic tunas at depths of 15-20 m in the anchored FADs examined.

Individual variation in mate preference in great tits (Parus major)
Zandberg, Lies - \ 2016
When all individuals have similar mate preferences, variation within a population should decrease, known as the ‘lek paradox’. One possible solution to this paradox may be that individuals differ in mate preference. Variation in preference may weaken the directional selection on traits and may thereby allow diversity to persist. We tested for individual differences in great tit mate preferences, and whether these preferences varied depending on the choosers own traits, since this would affect the relative benefit of complementary traits in their partner. Using a six-choice test 70 males and females were tested for their mate preference. Preference functions were calculated for several phenotypic and genetic traits, among which plumage ornaments, personality and heterozygosity. We found evidence for an important role for genetic traits in individual preferences, and complementary preferences depending on the choosers traits. Such non directional mate preferences have implications for the maintenance of variation in nature.
Zandafzetting, standplaats, beheer en botanische kwaliteit van Stroomdalgrasland
Rotthier, S.L.F. ; Sykora, K.V. ; Bekisa, B. ; Ras̆omavic̆ius, V. ; Makaske, A. ; Wallinga, J. ; Schipper, P. - \ 2016
Driebergen : Vereniging van Bos- en Natuurterreineigenaren (Rapport nr. 2016/OBN-200-RI) - 196 p.
Het onderzoek naar de ecologie van stroomdalgrasland vond plaats langs zes riviertakken: de Gelderse IJssel (Cortenoever en Vreugderijkerwaard), de Lek (Koekoekswaard), de Maas (Oeffelter Meent), de Merwede (Kop van de Oude Wiel), de Overijsselse Vecht (Junner Koeland), de Waal (Millingerwaard en Erlecomsewaard).
Biologische bestrijding vraagt om goede strategie
Dalfsen, P. van; Abeelen, F. van; Pijnakker, J. ; Lek, R. - \ 2015
De Boomkwekerij 28 (2015)12. - ISSN 0923-2443 - p. 27 - 27.
Kies de juiste vriend tegen je vijand
Dalfsen, P. van; Abeelen, F. ; Pijnakker, J. ; Lek, R. - \ 2015
Randwijk : Praktijkonderzoek Plant en Omgeving, Bloembollen, Boomkwekerij en Fruit - 35 p.
'Hoe lek is de kas?'
Kempkes, F. - \ 2015
Individual variation in mate preference in great tits (Parus major)
Zandberg, E.C.A. ; Oers, K. van; Hinde, C.A. - \ 2014
In: Book of Abstracts of the 15th Conference of the International Society for Behavioral Ecology (ISBE2014). - - p. 305 - 305.
When individuals have the same preference for mates, variation within the population should decrease, known as the ‘lekparadox’. Resolution of the lek paradox has been attempted by considering fluctuating selection, condition dependence of the signal, as well as mate choice for non-additive genetic benefits, but the possible role of individual differences in matechoice is severely underexplored. Variation in mate preferences may weaken the strong directional selection on ornaments and thereby allow diversity to persist. Here we tested for individual differences in great tit mate preferences, and whether these preferences vary depending on the chooser’s own traits, since this would affect the relative benefit of complementary traits in their partner. In great tits, as in numerous passerine species, both males and females are ornamented and invest heavily in reproduction. They both display multiple ornaments primarily relating to dominance (breast stripe) and parental care (yellow plumage). We expected that not only the females, but both sexes would display mate preferences. Using a 6 choice test 29 female and 30 male great tits were tested for their mate preference. Preference functions were calculated for a number of traits such as breast stripe size, intensity of yellow breast feathers and personality. Here we describe the individual mate preferences in relation to the choosers own phenotype.
Local knowledge and perceptions of animal population abundances by communities adjacent to the northern Gonarezhou National Park, Zimbabwe
Gandiwa, E. - \ 2012
Tropical conservation science 5 (2012)3. - ISSN 1940-0829 - p. 255 - 269.
traditional ecological knowledge - africa protected areas - wildlife management - conservation - perspective - prospects - indonesia - campfire - declines - tanzania
Understanding animal abundances and population trends is a fundamental goal of ecology. The aim of this study was to examine local ecological knowledge (LEK) held by local people bordering the northern Gonarezhou National Park (GNP), Zimbabwe, concerning domestic and wild animal species abundances and perceived population trends, in order to evaluate the possible contribution of LEK to wildlife conservation and management. Data were collected through interviews using a semi-structured questionnaire from 236 local people in communities adjacent to the northern GNP from December 2010 to May 2011. The results show that perceptions of domestic animal population trends were mixed, with 44% of the respondents perceiving an increase, 36% perceiving a decline, and 20% perceiving that domestic animal populations had remained the same between 2000 and 2010. Furthermore, about 76% of the respondents perceived that wild animal abundances had increased, 15% perceived a decline, and 9% perceived that wild animal abundances had remained the same in GNP between 2000 and 2010. Responses on perceptions of animal population trends were to a great extent in line with recorded population trends from conventional scientific studies. The study results suggest that LEK may serve as a valuable source of ecological information and could compliment scientific information for wildlife conservation and management, particularly in community-based natural resources management programmes.
Competitive Dairy Value Chains in Southeast Asia – Part II : Dairy Expert Roundtable Meeting, December 8 & 9, 2010, Muak Lek, Thailand
Haartsen, L. ; Lee, J. van der; Wouters, A.P. - \ 2011
Wageningen : Wageningen UR Centre for Development Innovation
The regional Dairy Expert Roundtable Meeting on “Competitive Dairy Value Chains in Southeast Asia” provided a forum for participants from six Southeast Asian countries to discuss how dairy value chains in this region can become more competitive and sustainable. The demand for dairy products in these countries is increasing steadily. Countries rely more and more on imports. Inefficiencies in the chain, low productivity, quality issues, as well as institutional obstacles make locally produced dairy products less competitive. International developments, national policies and experiences, lessons learned, and challenges in the value chain were presented and discussed during the meeting. Many countries in the region face similar challenges. Solutions depend much on the local context. Better exchange of experiences and knowledge among the Southeast Asian countries can contribute to more efficient local dairy value chains. This document, Part II, contains the PowerPoint presentations from the workshop and is an annex to the main report (Part I) of the meeting.
Competitive dairy value chains in Southeast Asia : Dairy Expert Roundtable Meeting December 8 & 9, 2010, Muak Lek, Thailand : part I: project report
Haartsen, L. ; Lee, J. van der; Wouters, A.P. - \ 2011
Wageningen : Wageningen UR Centre for Development Innovation - 41
Evaluatie van de vistrappen in de Nederrijn-Lek
Winter, H.V. - \ 2010
IJmuiden : IMARES (Rapport / Wageningen IMARES C064/10) - 38
zoetwatervissen - vismigratie - hydraulische systemen - stuwen - rivieren - lek - rijn - monitoring - freshwater fishes - fish migration - hydraulic structures - weirs - rivers - river lek - river rhine
In de periode 2001-2004 zijn er drie stuwen in de Nederrijn-Lek voorzien van een vistrap. Het toegepaste type was een bekkenvistrap met V-vormige overlaten en een 'vertical slot' sleuf in het midden tot op de bodem. Deze vistrappen zijn de eerste van dit type die gebouwd zijn. Het ontwerp is zodanig dat deze vistrappen geacht worden alle vissoorten van alle formaten te faciliteren in het passeren van de stuwen. In deze evaluatie is gekeken of de vistrappen voldoen.
Klimaatdijk in de praktijk: Gebiedsspecifiek onderzoek naar nieuwe klimaatbestendige dijkverbeteringsalternatieven langs de Nederrijn en Lek
Moel, H. de; Beijersbergen, J. ; Berg, F. van den; Goei, J. de; Koch, R.C. de; Koelewijn, A.R. ; Loon-Steensma, J.M. van; Molenaar, I.M. ; Steenbergen-Kajabová, J. ; Schelfhout, H. ; Versluis, S. ; Zantinge, A.M. - \ 2010
Utrecht : Klimaat voor Ruimte (KvK rapport 019/2010) - ISBN 9789490070182 - 174
dijken - onderhoud - veiligheid - hoogwaterbeheersing - klimaatverandering - rivierengebied - dykes - maintenance - safety - flood control - climatic change - rivierengebied
Momenteel worden op vele locaties in het Nederlandse rivierengebied de dijken versterkt om mensen en kapitaal in het achterliggende gebied te beschermen. Deze dijkversterkingen lijken bijna een continu proces te zijn, in gang gehouden door veranderende inzichten, randvoorwaarden en omstandigheden. Klimaatverandering heeft de potentie om ervoor te zorgen dat dijken in de toekomst opnieuw moeten worden versterkt vanwege veranderingen in hydraulische omstandigheden. Het waterschap Rivierenland wil zoveel mogelijk voorkomen dat tracés die nu versterkt worden in de nabije toekomst opnieuw moeten worden versterkt om zo dubbel werk en overlast voor de bewoners te voorkomen. Op plaatsen waar nu dijkversterkingen zijn gepland wil het waterschap deze graag zo robuust uitvoeren, dat versterking lange tijd kan worden uitgesteld, zelfs onder veranderende omstandigheden vanwege klimaatverandering.
Uiterwaarden Lek
Janssen, J.A.M. - \ 2009
In: Europese Natuur in Nederland. Natura 2000-gebieden van Laag Nederland. / Janssen, J.A.M., Schaminée, J.H.J., Zeist : KNNV uitgeverij - ISBN 9789050112833 - p. 48 - 51.
Space use of Amazonian poison frogs: Testing the reproductive resource defense hypothesis
Poelman, E.H. ; Dicke, M. - \ 2008
Journal of Herpetology 42 (2008)2. - ISSN 0022-1511 - p. 270 - 278.
male mating success - dendrobates-pumilio - territorial behavior - colostethus-beebei - home-range - ventrimaculatus - strategies - anura - supplementation - systematics
In most Anuran species, space use includes a lek mating system with defense of a calling site for only a short time period during an individual's lifespan. In contrast, territoriality over a longer time period by one or both of the sexes has been reported in all studied dendrobatid frogs. In most dendrobatid species, territories are defended for reproductive purposes, and typically, males vocalize from these territories to attract mates and repel rivals. It has been hypothesized that reproductive resources such as oviposition sites or tadpole deposition sites are defended. For reproductive resource defense to occur, reproductive units (eggs or tadpoles) must be deposited at sites where the territorial individual displays agonistic interaction with intruding individuals. Here, we challenge this assumption in a field study on the poison frog Dendrobates ventrimaculatus in French Guiana. We show that home-range size is affected by spatial distribution of bromeliads. Clutches of eggs were found to be predominantly deposited in bromeliads located inside the 50% Kernel core areas of activity within male territories, although tadpoles were deposited more frequently outside these core areas. Vocalization of males only occurred in agonistic interactions with other males or while courting a female. Our data show that (1) males of D. ventrimaculatus defend small territories containing their reproductive resources, (2) these resources are not limited in number, and (3) territories are not defended for characteristics supporting advertisement vocalization. We conclude that males defend territories to increase the success of courting a female without interruption by other males.
Helpdesk-vraag: effecten van visserij binnen een radius van 500 m. van stuwen, dammen en waterkrachtcentrales
Winter, H.V. ; Jansen, H.M. - \ 2007
IJmuiden : IMARES (Rapport / Wageningen IMARES no. C055/07) - 19
vissen - stuwen - zoetwaterconstructies - visserij - palingen - ijsselmeer - maas - rijn - fishes - weirs - freshwater structures - fisheries - eels - lake ijssel - river meuse - river rhine
Directie Visserij van LNV is van plan een visverbod in te stellen bij een stuw en waterkrachtcentrale binnen een afstand van 500 meter. Nagegaan wordt, in welke mate dat effectief is voor het de doelsoort aal; en wat de impact is voor bijvangsten van migrerende soorten zoals zalm en zeeforel. Behalve een literatuurstudie bevat dit onderzoek een paar case studies op de Maas bij Lith en Linne; op de Lek bij Hagestein en de Afsluitdijk bij Kornwerderzand
Zender experiment met zalm en zeeforel in de Lek/Nederrijn bij Hagestein gedurende 2005 - 2006
Winter, H.V. ; Leeuw, J.J. de - \ 2007
IJmuiden : IMARES (Rapport / Wageningen, Institute for Marine Resources &amp; Ecosystem Studies (IMARES) nr. C053/07) - 17
vissen - salmonidae - vismigratie - monitoring - zoetwaterconstructies - hydraulische systemen - rijn - fishes - fish migration - freshwater structures - hydraulic structures - river rhine
In het kader van een evaluatie van de effectiviteit van vistrappen in de Rijn (bij Hagestein, Maurik en Driel) voor de optrek van vis is dit een deelonderzoek. Namelijk die van een zender-experiment van zalm en zeeforel bij Hagestein gedurende het najaar van 2005 en 2006
Vismigratie via de vistrappen bij Hagestein en Maurik tijdens het voorjaar van 2006
Winter, H.V. - \ 2006
IJmuiden : IMARES (Rapport / Wageningen IMARES C092/06) - 34
vissen - stuwen - waterbouwkunde - rivieren - monitoring - petromyzon - vismigratie - rijn - gelderland - fishes - weirs - hydraulic engineering - rivers - fish migration - river rhine
De Neder-Rijn/Lek is na het gereedkomen van de vistrappen bij de stuwen van Hagestein en Maurik in 2004 en bij Driel in 2001 nu volledig optrekbaar voor vis. In navolging van het voorjaar van 2005 is er in 2006 de optrek bij Hagestein en Maurik bemonsterd door middel van fuiken geplaatst in het bovenstroomse deel van de vistrap. De gevangen vis werd gedetermineerd, gemeten en daarna bovenstrooms uitgezet om de migratie te hervatten. Daarnaast is er ook een merk-experiment met zeeprik uitgevoerd, omdat er in 2005 werd geconstateerd dat een veel groter aantal zeeprikken bij Hagestein passeerde dan bij Maurik, terwijl deze diadrome riviertrekvis verondersteld werd gemotiveerd te zijn om de heel serie vistrappen in de Neder-Rijn te passeren.
Patterning exergy of benthic macroinvertebrate communities using self-organizing maps
Park, Y.S. ; Lek, S. ; Scardi, M. ; Verdonschot, P.F.M. ; Jørgensen, S.E. - \ 2006
Ecological Modelling 195 (2006)1-2. - ISSN 0304-3800 - p. 105 - 113.
artificial neural-networks - dynamics
Exergy is a measure of the free energy of a system with contributions from all components including the energy of organisms, and it is used as an ecological indicator. In this study, we implemented a self-organizing map (SOM) for patterning exergy of benthic macroinvertebrate communities. The datasets were extracted from the database EKOO consisting of 650 sampling sites in the Netherlands including 855 species. Using these datasets, exergy of five trophic functional groups (carnivores, detritivores, detritivore¿herbivores, herbivores, and omnivores) were calculated for each sampling site on the basis of the biomass data. Exergy of each trophic group was used as input data of the SOM. By training the SOM the sampling sites were classified into five clusters and the classification was mainly related to water types of the sampling sites. Exergy of different trophic groups responded differently to different water types displaying characteristics of target ecosystems. Finally, the results show that exergy is an effective ecological indicator and patterning changes of exergy is an effective way to evaluate target ecosystems.
Vismigratie via de vistrappen bij Hagestein en Maurik tijdens het voorjaar van 2005
Winter, H.V. ; Klop, R.W. ; Klop, W. ; Klop, K. ; Baks, B. - \ 2005
IJmuiden : RIVO (Rapport / Nederlands Instituut voor Visserij Onderzoek (RIVO) C055/05) - 34
vismigratie - vissen - sluizen - rivieren - rijn - fish migration - fishes - sluices - rivers - river rhine
In 2004 zijn om de stuwen in de Neder-Rijn/Lek bij Hagestein en bij Amerongen (op het Eiland van Maurik) bekken-vistrappen aangelegd om de optrek van vis te verbeteren. Hierbij is een nieuw type vistrap toegepast die daarvoor alleen bij Driel is gebouwd. Om een indruk te krijgen van het functioneren van deze vistrappen is van 14 maart tot 8 juni 2005 de optrek bij Hagestein en Maurik bemonsterd. Minimaal 23 vissoorten hebben gebruik gemaakt van de vistrap bij Maurik en 19 van de vistrap bij Hagestein. In totaal zijn 24 vissoorten waargenomen.
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