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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Calibration and validation of toxicokinetic-toxicodynamic models for three neonicotinoids and some aquatic macroinvertebrates
Focks, Andreas ; Belgers, Dick ; Boerwinkel, Marie Claire ; Buijse, Laura ; Roessink, Ivo ; Den Brink, Paul J. van - \ 2018
Ecotoxicology 27 (2018)7. - ISSN 0963-9292 - p. 992 - 1007.
Aquatic ecotoxicology - Macroinvertebrates - Neonicotinoids - Time-variable exposure - Toxicokinetic-toxicodynamic modelling
Exposure patterns in ecotoxicological experiments often do not match the exposure profiles for which a risk assessment needs to be performed. This limitation can be overcome by using toxicokinetic-toxicodynamic (TKTD) models for the prediction of effects under time-variable exposure. For the use of TKTD models in the environmental risk assessment of chemicals, it is required to calibrate and validate the model for specific compound–species combinations. In this study, the survival of macroinvertebrates after exposure to the neonicotinoid insecticide was modelled using TKTD models from the General Unified Threshold models of Survival (GUTS) framework. The models were calibrated on existing survival data from acute or chronic tests under static exposure regime. Validation experiments were performed for two sets of species-compound combinations: one set focussed on multiple species sensitivity to a single compound: imidacloprid, and the other set on the effects of multiple compounds for a single species, i.e., the three neonicotinoid compounds imidacloprid, thiacloprid and thiamethoxam, on the survival of the mayfly Cloeon dipterum. The calibrated models were used to predict survival over time, including uncertainty ranges, for the different time-variable exposure profiles used in the validation experiments. From the comparison between observed and predicted survival, it appeared that the accuracy of the model predictions was acceptable for four of five tested species in the multiple species data set. For compounds such as neonicotinoids, which are known to have the potential to show increased toxicity under prolonged exposure, the calibration and validation of TKTD models for survival needs to be performed ideally by considering calibration data from both acute and chronic tests.
Toxicity of sediment-bound lufenuron to benthic arthropods in laboratory bioassays
Brock, T.C.M. ; Belgers, J.D.M. ; Boerwinkel, M.C. ; Jollie, L. ; Kraak, M.H.S. ; Papo, M.J. ; Vonk, J.A. ; Roessink, I. - \ 2018
Aquatic Toxicology 198 (2018). - ISSN 0166-445X - p. 118 - 128.
Benthic macroinvertebrates - Benzoylurea insecticide - Regulatory acceptable concentration - Sediment ecotoxicology - Sediment-spiked laboratory toxicity tests - Species sensitivity distributions
This paper deals with species sensitivity distributions (SSDs) for the lipophilic insecticide lufenuron and benthic arthropods based on sediment-spiked laboratory toxicity tests. This compound that inhibits chitin synthesis and moulting of arthropods persists in sediment. Using field-collected sediment, toxicity tests were conducted with three macro-crustaceans and six insects. The Hazardous Concentration to 5% of the tested species, the HC5 (and 95% confidence limit), derived from an SSD constructed with 10d-LC50′s was 2.2 (1.2–5.7) μg/g organic carbon (OC) in dry sediment. In addition, HC5 values derived from SSDs constructed with 28d-LC10 and 28-d LC50 values were 0.13 (0.02–1.50) μg/g OC and 2.0 (1.3–5.5) μg/g OC, respectively. In 28d toxicity tests with Chironomus riparius and Hyalella azteca, a higher sensitivity was observed when using lufenuron-spiked field-collected sediment than in lufenuron-spiked artificial sediment. Overall, the non-biting midge C. riparius appeared to be a representative and sensitive standard test species to assess effects of lufenuron exposure in sediment. The Tier-1 (based on standard test species), Tier-2 (based on standard and additional test species) and Tier-3 (model ecosystem approach) regulatory acceptable concentrations (RACs) for sediment-spiked lufenuron did not differ substantially. The Tier-2 RAC was the lowest. Since to our knowledge this study is the first in the open literature that evaluates the tiered approach in the sediment effect assessment procedure for pesticides, we advocate that similar evaluations should be conducted for pesticides that differ in toxic mode-of-action.
Exposure and effects of sediment-spiked fludioxonil on macroinvertebrates and zooplankton in outdoor aquatic microcosms
Yin, Xiaohui ; Brock, Theo C.M. ; Barone, Lidia E. ; Belgers, J.D.M. ; Boerwinkel, Marie Claire ; Buijse, Laura ; Wijngaarden, René P.A. van; Hamer, Mick ; Roessink, Ivo - \ 2018
Science of the Total Environment 610-611 (2018). - ISSN 0048-9697 - p. 1222 - 1238.
Benthic and pelagic populations - Direct and indirect effects - Exposure dynamics - Fungicide - Sediment ecotoxicology

Information from effects of pesticides in sediments at an ecosystem level, to validate current and proposed risk assessment procedures, is scarce. A sediment-spiked outdoor freshwater microcosm experiment was conducted with fludioxonil (lipophilic, non-systemic fungicide) to study exposure dynamics and treatment-related responses of benthic and pelagic macroinvertebrates and zooplankton. Besides blank control and solvent control systems the experiment had six different treatment levels (1.7–614 mg a.s./kg dry sediment) based around the reported 28-d No Observed Effect Concentration (NOEC) for Chironomus riparius (40 mg a.s./kg dry sediment). Twelve systems were available per treatment of which four were sacrificed on each of days 28, 56 and 84 after microcosm construction. Fludioxonil persisted in the sediment and mean measured concentrations were 53–82% of the initial concentration after 84 days. The dissipation rate increased with the treatment level. Also exposure concentrations in overlying water were long-term, with highest concentrations 28 days after initiation of the experiment. Sediment-dwelling Oligochaeta and pelagic Rotifera and Cladocera showed the most pronounced treatment-related declines. The most sensitive sediment-dwelling oligochaete was Dero digitata (population NOEC 14.2 mg a.s./kg dry sediment). The same NOEC was calculated for the sediment-dwelling macroinvertebrate community. The most sensitive zooplankton species was the cladoceran Diaphanosoma brachyurum (NOEC of 1.6 μg a.s./L in overlying water corresponding to 5.0 mg a.s./kg dry sediment). At the two highest treatments several rotifer taxa showed a pronounced decrease, while the zooplankton community-level NOEC was 5.6 μg a.s./L (corresponding to 14.2 mg a.s./kg dry sediment). Zooplankton taxa calanoid Copepoda and Daphnia gr. longispina showed a pronounced treatment-related increase (indirect effects). Consequently, an assessment factor of 10 to the chronic laboratory NOECs of Chironomus riparius (sediment) and Daphnia magna (water) results in a regulatory acceptable concentration that is sufficiently protective for both the sediment-dwelling and pelagic organisms in the microcosms.

Effects of sediment-spiked lufenuron on benthic macroinvertebrates in outdoor microcosms and single-species toxicity tests
Brock, T.C.M. ; Bas, D.A. ; Belgers, J.D.M. ; Bibbe, L. ; Boerwinkel, M.C. ; Crum, S.J.H. ; Diepens, N.J. ; Kraak, M.H.S. ; Vonk, J.A. ; Roessink, I. - \ 2016
Aquatic Toxicology 177 (2016). - ISSN 0166-445X - p. 464 - 475.
Benzoylurea insecticide - Chironomus riparius - Hyalella azteca - Lumbriculus variegatus - Sediment ecotoxicology - Semi-field experiment

Sediment ecotoxicity studies were conducted with lufenuron to (i) complement the results of a water-spiked mesocosm experiment with this lipophilic benzoylurea insecticide, (ii) to explore the predictive value of laboratory single-species tests for population and community-level responses of benthic macroinvertebrates, and (iii) to calibrate the tier-1 effect assessment procedure for sediment organisms. For this purpose the concentration-response relationships for macroinvertebrates between sediment-spiked microcosms and those of 28-d sediment-spiked single-species toxicity tests with Chironomus riparius, Hyalella azteca and Lumbriculus variegatus were compared. Lufenuron persisted in the sediment of the microcosms. On average, 87.7% of the initial lufenuron concentration could still be detected in the sediment after 12 weeks. Overall, benthic insects and crustaceans showed treatment-related declines and oligochaetes treatment-related increases. The lowest population-level NOEC in the microcosms was 0.79 μg lufenuron/g organic carbon in dry sediment (μg a.s./g OC) for Tanytarsini, Chironomini and Dero sp. Multivariate analysis of the responses of benthic macroinvertebrates revealed a community-level NOEC of 0.79 μg a.s./g OC. The treatment-related responses observed in the microcosms are in accordance with the results of the 28-d laboratory toxicity tests. These tests showed that the insect C. riparius and the crustacean H. azteca were approximately two orders of magnitude more sensitive than the oligochaete L. variegatus. In our laboratory tests, using field-collected sediment, the lowest 28-d EC10 (0.49 μg a.s./g OC) was observed for C. riparius (endpoint survival), while for the standard OECD test with this species, using artificial sediment, a NOEC of 2.35 μg a.s./g OC (endpoint emergence) is reported. In this particular case, the sediment tier-1 effect assessment using the chronic EC10 (field-collected sediment) or chronic NOEC (artificial sediment) of C. riparius and an assessment factor of 10, seems to be protective for the treatment-related responses observed in the sediment-spiked microcosms.

Chronic aquatic effect assessment for the fungicide azoxystrobin
Wijngaarden, R.P.A. van; Belgers, J.D.M. ; Zafar, M.I. ; Matser, A.M. ; Boerwinkel, M.C. ; Arts, G.H.P. - \ 2014
Environmental Toxicology and Chemistry 33 (2014)12. - ISSN 0730-7268 - p. 2775 - 2785.
fresh-water microcosms - herbicide linuron - primary producers - outdoor ponds - responses - 3,4-dichloroaniline - chlorpyrifos - sensitivity - fate - invertebrates
This study examined ecological effects of a range of chronic exposure concentrations of the fungicide azoxystrobin in freshwater experimental systems (1270 L outdoor microcosms). Intended and environmentally relevant test concentrations of azoxystrobin were 0, 0.33, 1, 3.3, 10, 33 µg ai/L, kept at constant values. Responses of freshwater populations and community parameters were studied. Over the 42-day experimental period, the time-weighted average concentrations of azoxystrobin ranged from 93.5 to 99.3% of intended values. Zooplankton, especially copepods and Daphnia group longispina, were the most sensitive groups. At the population level, a consistent NOEC of 1 µg ai/L was calculated for Copepoda. The NOEC at the zooplankton community level was 10 µg azoxystrobin/L. The principle of the EU pesticide directive is that lower-tier Regulatory Acceptable Concentrations (RACs) are protective of higher-tier RACs. This was tested for chronic risks from azoxystrobin. With the exception of the microcosm community chronic RAC (highest tier), all other chronic RAC values were similar to each other (0.5 – 1 µg ai/L). The new and stricter first-tier species requirements of the EU pesticide regulation (1107/2009/EC) are not protective for the most sensitive populations in the microcosm study, when based on the higher-tier population RAC. In comparison, the Water Framework Directive (WFD) generates Environmental Quality Standards (EQS) which are 5 - 10 times lower than the derived chronic RACs.
Species traits as predictors for intrinsic sensitivity of aquatic invertebrates to the insecticide chlorpyrifos
Rubach, M.N. ; Baird, D.J. ; Boerwinkel, M.C. ; Maund, S.J. ; Roessink, I. ; Brink, P.J. van den - \ 2012
Ecotoxicology 21 (2012)7. - ISSN 0963-9292 - p. 2088 - 2101.
ecological risk-assessment - fresh-water arthropods - daphnia-magna - toxicity assessment - organic-chemicals - biological traits - model - exposure - bioconcentration - bioaccumulation
Ecological risk assessment (ERA) has followed a taxonomy-based approach, making the assumption that related species will show similar sensitivity to toxicants, and using safety factors or species sensitivity distributions to extrapolate from tested to untested species. In ecology it has become apparent that taxonomic approaches may have limitations for the description and understanding of species assemblages in nature. Therefore it has been proposed that the inclusion of species traits in ERA could provide a useful and alternative description of the systems under investigation. At the same time, there is a growing recognition that the use of mechanistic approaches in ERA, including conceptual and quantitative models, may improve predictive and extrapolative power. Purposefully linking traits with mechanistic effect models could add value to taxonomy-based ERA by improving our understanding of how structural and functional system facets may facilitate inter-species extrapolation. Here, we explore whether and in what ways traits can be linked purposefully to mechanistic effect models to predict intrinsic sensitivity using available data on the acute sensitivity and toxicokinetics of a range of freshwater arthropods exposed to chlorpyrifos. The results of a quantitative linking of seven different endpoints and twelve traits demonstrate that while quantitative links between traits and/or trait combinations and process based (toxicokinetic) model parameters can be established, the use of simple traits to predict classical sensitivity endpoints yields little insight. Remarkably, neither of the standard sensitivity values, i.e. the LC50 or EC50, showed a strong correlation with traits. Future research in this area should include a quantitative linking of toxicodynamic parameter estimations and physiological traits, and requires further consideration of how mechanistic trait-process/parameter links can be used for prediction of intrinsic sensitivity across species for different substances in ERA.
Mogelijke effecten van geneesmiddelen in effluent op aquatische organismen
Roessink, I. ; Fait, G. ; Belgers, J.D.M. ; Boerwinkel, M.C. - \ 2012
Wageningen : Alterra, Wageningen-UR (Alterra-report 2338) - 46
geneesmiddelen - waterorganismen - afvoerwater - milieueffect - waterverontreiniging - experimentele ecosystemen - drugs - aquatic organisms - effluents - environmental impact - water pollution - experimental ecosystems
Dit onderzoek is uitgevoerd in opdracht van het waterschap Regge en Dinkel. In dit onderzoek wordt met de beschikbare internationale literatuur en een experimentele studie onderzocht of er mogelijke effecten op populaties van aquatische organismen te verwachten zijn van geneesmiddelen in effluent van waterzuiveringsinstallaties. De gevonden resultaten in de testsystemen laten zien dat met uitzondering van Sulfamethoxazole en Bisphenol A de geneesmiddelen in het testmedium onder de gebruikte testcondities niet persistent zijn. Er kon geen negatieve impact van het geteste effluent op populaties van watervlooien, waterpissebedden, wormen, slakken en waterplanten aangetoond worden. Het effluent had echter wel een stimulerend effect op de populatiedichtheden van deze waterorganismen. Dit werd waarschijnlijk veroorzaakt door de hoge voedselbeschikbaarheid (nutriënten; organisch materiaal) in het effluent.
Cadmium Accumulation in Small Mammals: Species Traits, Soil Properties, and Spatial Habitat Use
Brink, N.W. van den; Lammertsma, D.R. ; Dimmers, W.J. ; Boerwinkel, M.C. - \ 2011
Environmental Science and Technology 45 (2011)17. - ISSN 0013-936X - p. 7497 - 7502.
mice apodemus-sylvaticus - heavy-metal concentrations - river floodplains - food-web - earthworms - lead - diet - bioaccumulation - stressors - pollution
In this study, the impact of species-specific spatial habitat use, diet preferences, and soil concentrations and properties on the accumulation of cadmium in small mammals was investigated. The results show that for the wood mouse (Apodemus sylvaticus), a mobile species with a large range in diet composition, accumulation of cadmium was not related to local soil concentrations or soil properties, but to diet preferences. For the common vole (Microtus arvalis), a nonmobile, specific feeding species, accumulation of cadmium was related to local soil concentrations or properties. For the bank vole (Myodes glareolus), a species with a smaller home range than the wood mouse but a broader diet spectrum than the common vole, both local soil properties and diet appeared to affect the cadmium accumulation in the kidneys. The results of this field study show that species-specific traits of small mammals are important determinants of accumulation of cadmium on a local scale. For site-specific assessment of risks of contaminants, such information is essential in order to understand exposure dynamics
Effects of soil properties on food web accumulation of heavy metals to the wood mouse (Apodemus sylvaticus)
Brink, N.W. van den; Lammertsma, D.R. ; Dimmers, W.J. ; Boerwinkel, M.C. ; Hout, A. van der - \ 2010
Environmental Pollution 158 (2010)1. - ISSN 0269-7491 - p. 245 - 251.
ecological risk-assessment - small mammals - earthworms - cadmium - lead - model - mice - zinc - netherlands - floodplain
Effects of soil properties on the accumulation of metals to wood mice (Apodemus sylvaticus) were evaluated at two sites with different pH and organic matter content of the soil. pH and organic matter content significantly affected accumulation of Cd, Cu, Pb and Zn in earthworms and vegetation. For Cd, Cu and Zn these effects propagated through the food web to the wood mouse. Soil-to-kidney ratios differed between sites: Cd: 0.15 versus 3.52, Cu: 0.37 versus 1.30 and Zn: 0.33–0.83. This was confirmed in model calculations for Cd and Zn. Results indicate that total soil concentrations may be unsuitable indicators for risks that metals pose to wildlife. Furthermore, environmental managers may, unintentionally, change soil properties while taking specific environmental measures. In this way they may affect risks of metals to wildlife, even without changes in total soil concentrations. Soil properties significantly affect accumulation of heavy metals to wood mice so; risks cannot be based on total concentrations.
The reintroduction of the Eurasian otter (Lutra lutra) into the Netherlands: hidden life revealed by noninvasive genetic monitoring
Koelewijn, H.P. ; Pérez-Haro, M. ; Jansman, H.A.H. ; Boerwinkel, M.C. ; Bovenschen, J. ; Lammertsma, D.R. ; Niewold, F.J.J. ; Kuiters, A.T. - \ 2010
Conservation Genetics 11 (2010)2. - ISSN 1566-0621 - p. 601 - 614.
natural-populations - individual identification - conservation genetics - spatial-organization - microsatellite loci - genotyping feces - eastern germany - dna - size - biology
The last recorded presence of the Eurasian otter (Lutra lutra) in the Netherlands dates from 1989 and concerned a dead individual. In 2002 a reintroduction programme was started, and between June 2002 and April 2008 a total of 30 individuals (10 males and 20 females) were released into a lowland peat marsh in the north of the Netherlands. Noninvasive genetic monitoring based on the genetic profiles obtained from DNA extracted from otter faeces (spraints) was chosen for the post-release monitoring of the population. To this end, the founding individuals were genotyped before release and spraints were collected in the release area each winter from 2002 to 2008. From June 2002 to April 2008 we analysed the genetic profile of 1,265 spraints on the basis of 7–15 microsatellite loci, 582 of which (46%) were successfully assigned to either released or newly identified genotypes. We identified 54 offspring (23 females and 31 males): the females started to reproduce after 2 years and the males after 4 years. The mating and reproductive success among males was strongly skewed, with a few dominant males fathering two-thirds of the offspring, but the females had a more even distribution. The effective population size (Ne) was only about 30% of the observed density (N), mainly because of the large variance in reproductive success among males. Most juvenile males dispersed to surrounding areas on maturity, whereas juvenile females stayed inside the area next to the mother’s territory. The main cause of mortality was traffic accidents. Males had a higher mortality rate (22 out of 41 males (54%) vs. 9 out of 43 females (21%)). During winter 2007/08 we identified 47 individuals, 41 of which originated from mating within the release area. This study demonstrates that noninvasive molecular methods can be used efficiently in post-release monitoring studies of elusive species to reveal a comprehensive picture of the state of the population
Effecten van locatiespecifieke bodemkarakteristieken op de accumulatie van zware metalen in terrestrische voedselketens : veldgegeven en modelelberekeningen
Brink, N.W. van den; Boerwinkel, M.C. ; Dimmers, W.J. ; Hout, A. van der; Lammertsma, D.R. - \ 2009
Wageningen : Alterra (Alterra-rapport 1639) - 42
zware metalen - bodemverontreiniging - bodemeigenschappen - bodem ph - organisch bodemmateriaal - voedselwebben - kleine zoogdieren - nederland - ecotoxicologie - heavy metals - soil pollution - soil properties - soil ph - soil organic matter - food webs - small mammals - netherlands - ecotoxicology
Bodemeigenschappen bepalen (mede) de biobeschikbaarheid van verontreinigingen en daarmee de opname ervan door bodemorganismen en planten. In deze studie ligt de aandacht bij kleine zoogdieren, met name muizen, zoals de bosmuis, veldmuis, spitsmuis. Veldwerk wordt beschreven dat uitgevoerd is om (eerder beschreven) modeluitkomsten te valideren. Op basis van deze veldgegevens, en verdere modelontwikkeling kan worden geconcludeerd dat er een sterke invloed is van de bodemkarakteristieken op de opname van zware metalen door kleine zoogdieren. De risico’s van dergelijke verontreinigingen voor hogere organismen als gevolg van voedselweb accumulatie worden daarmee niet alleen bepaald door de totaalgehaltes van deze verontreinigingen in de bodem, maar ook door de beschikbaarheid ervan.
Na herintroductie in 2002: Het gaat goed met de otter
Lammertsma, D.R. ; Kuiters, A.T. ; Niewold, F.J.J. ; Jansman, H.A.H. ; Koelewijn, H.P. ; Perez-Haro, M.I. ; Boerwinkel, M.C. ; Bovenschen, J. - \ 2008
Zoogdier 19 (2008)2. - ISSN 0925-1006 - p. 3 - 5.
otters - lutra lutra - zoogdieren - populatie-ecologie - populaties - wildbeheer - mammals - population ecology - populations - wildlife management
Na het uitsterven van de otter (Lutra lutra) in Nederland in 1989 werd in juli 2002 gestart met de herintroductie er van in de Kop van Overijssel (De Wieden). De otters zijn gevolgd. De populatie is flink toegenomen. Een toenemende bron van zorg is het aantal doodgereden otters in en rondom de uitzetgebieden. De otter heeft zich inmiddels door het hele uitzetgebied verspreid, alsmede een aantal aangrenzende gebieden. Ook wordt er bij geplande uitbreidingen rekening gehouden met de ecologische verbindingszones
Herintroductie van de otter: een succesverhaal?
Lammertsma, D.R. ; Niewold, F.J.J. ; Jansman, H.A.H. ; Kuiters, L. ; Koelewijn, H.P. ; Perez Haro, M.I. ; Adrichem, M.H.C. van; Boerwinkel, M.C. ; Bovenschen, J. - \ 2006
De Levende Natuur 107 (2006)2. - ISSN 0024-1520 - p. 42 - 46.
lutra - geïntroduceerde soorten - populatiedynamica - migratie - monitoring - overijssel - noordwest-overijssel - introduced species - population dynamics - migration
In 1988 werd in Friesland de laatste otter doodgereden. Kort hierna begon men met voorbereidingen van terugkeer, in juli 2002 ging de herintroductie van start; halverwege het programma is nu de tijd voor een tussenbalans
Chloroplast DNA haplotype samenstelling van eikenopstanden (categorie "van bekende origine") van de Rassenlijst van Bomen; een aanvullende methode voor identificatie van autochtoniteit
Buiteveld, J. ; Boerwinkel, M.C. ; Bovenschen, J. ; Kranenborg, K.G. ; Vries, S.M.G. de - \ 2005
Wageningen : Alterra (Alterra-rapport 1169) - 40
quercus petraea - quercus - quercus robur - chloroplast dna - centra van herkomst - genetische bronnen - haplotypen - nederland - centres of origin - genetic resources - haplotypes - netherlands
Tegenwoordig kan autochtoon materiaal op de Rassenlijst van Bomen geplaatst worden in de categorie `van bekende origine¿ en heeft daardoor een `officiële¿ status. Identificatie van autochtone opstanden blijft echter nog een lastige zaak. Momenteel worden autochtone opstanden geïdentificeerd met de veldmethode van Maes (1993), waarbij zowel historische als veldcriteria worden gehanteerd. Voor zomer- en wintereik kan ook chloroplastDNA onderzoek naar postglaciale migratieroutes gebruikt worden om vast te stellen of een herkomst als autochtoon aangemerkt kan worden. In dit rapport is de chloroplast-haplotype samenstelling van eikenopstanden in de categorie `van bekende origine¿ van de Rassenlijst van Bomen beschreven, met als doel een uitspraak te doen over de fylogenetische oorsprong en het autochtone karakter van deze eikenopstanden. De studie heeft laten zien dat onderzoek naar de cpDNAvariatie een waardevolle aanvulling is op de criteria die gebruikt worden voor de evaluatie van autochtoniteit van eikenopstanden. Daarnaast laat het cpDNAonderzoek zien dat er duidelijke geografische verschillen en soortverschillen zijn voor de mate van autochtoniteit. Zo bevestigt cpDNAonderzoek zowel het vermoeden dat in het westen van Nederland minder autochtone opstanden bewaard zijn gebleven dan in het oostelijk deel van het land als dat zomereik meer verplaatst en aangeplant is dan wintereik.
Genetische diversiteit binnen de fokpopulatie van korhoenders op Nationaal Park De Hoge Veluwe in relatie tot referentiepopulaties
Jansman, H.A.H. ; Bovenschen, J. ; Boerwinkel, M.C. ; Perez Haro, M.I. ; Niewold, F.J.J. ; Koelewijn, H.P. - \ 2004
Wageningen : Alterra (Alterra-onderzoeksrapport korhoen 2004-1) - 41
hoenders - tetrao - genetische diversiteit - populatiegenetica - wildbeheer - fauna - natuurgebieden - veluwe - gelderland - grouse - genetic diversity - population genetics - wildlife management - natural areas
Forests as a mirror of rural conditions; local views on the role of forests across Europe
Elands, B.H.M. ; O'Leary, T.N. ; Boerwinkel, H.W.J. ; Wiersum, K.F. - \ 2004
Forest Policy and Economics 6 (2004)5. - ISSN 1389-9341 - p. 469 - 482.
In a rapidly changing rural Europe, forests are promoted as contributing towards rural development in the sense of improved well-being of local communities. A trans-European research project was designed to establish whether varied rural conditions and the perspectives of local communities influence the perceived contribution of forests towards rural development. In eight European countries inhabitants and landowners were interviewed about their perceptions of quality of life in rural areas and the extent to which forests impact upon it. The contribution of forests to quality of life is perceived as either harmful, beneficial or having nothing to offer. Further, preferred future development options were assessed for the area. It turns out that the main differences between areas are related to perceptions of localities as being more or less 'marginal' and perceptions of the role of forests as being more or less 'harmful for rurality'. Results show that it is the perceived harmful aspect of forests that differentiate areas the most. Host people do not regard forestry as a major future development option, principally due to negative association with, for example, employment opportunities, industrial activities and strength of bond and friendship between neighbours. The differences between areas are related to socio-economic and cultural conditions as well as local forest history. (C) 2004 Elsevier B.V. All rights reserved.
Genetische variatie van zomereik in een aanplant en een spontane verjonging
Dam, B.C. van; Hees, A.F.M. van; Boerwinkel, M.C. - \ 2001
Nederlands Bosbouwtijdschrift 73 (2001)1. - ISSN 0028-2057 - p. 30 - 34.
quercus - quercus robur - bossen - populaties - populatiegenetica - genetische diversiteit - genetische variatie - genetische analyse - moleculaire biologie - microsatellieten - populatiebiologie - midden-limburg - forests - populations - population genetics - genetic diversity - genetic variation - genetic analysis - molecular biology - microsatellites - population biology
Uit een vergelijking van de genetische variatie in een aangeplant bos en een natuurlijke verjonging (Amerongen) met een natuurlijk bos (De Meinweg) blijkt dat het bosbeheer geen waarneembaar effect heeft. Door de bijdrage van vele, onbekende vaders is de genetische variatie overal groot. Het onderzoek werd uitgevoerd met microsatelliet-analyse
Exoten: beleefd en gewogen.
Veer, M. ; Boerwinkel, H.W.J. - \ 1998
Nederlands Bosbouwtijdschrift 69 (1998)4. - ISSN 0028-2057 - p. 157 - 164.
migratie - invasie - bosbouw - recreatie - migration - invasion - forestry - recreation
Public perception of land use transformations, conceived and measured in terms of appropriation.
Boerwinkel, H.W.J. - \ 1998
In: Public perception and attitudes of forest owners towards forest in Europe / Terrasson, D., Antony, France : Cemagref - p. 91 - 105.
Perceptions and attitudes in environmental transactions considered as appropriation components.
Boerwinkel, H.W.J. - \ 1998
In: Public perception and attitudes of forest owners towards forest in Europe / Terrasson, D., Antony, France : Cemagref - p. 11 - 20.
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