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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    Unexpected role of canonical aerobic methanotrophs in upland agricultural soils
    Ho, Adrian ; Lee, Hyo Jung ; Reumer, Max ; Meima-Franke, Marion ; Raaijmakers, Ciska ; Zweers, Hans ; Boer, Wietse de; Putten, Wim H. Van der; Bodelier, Paul L.E. - \ 2019
    Soil Biology and Biochemistry 131 (2019). - ISSN 0038-0717 - p. 1 - 8.
    C labelling - High-affinity methane oxidation - Methylocystaceae - PLFA analysis/ land-use change - pmoA

    Aerobic oxidation of methane at (circum-)atmospheric concentrations (<40 ppmv) has long been assumed to be catalyzed by the as-yet-uncultured high-affinity methanotrophs in well-aerated, non-wetland (upland) soils, the only known biological methane sink globally. Although the low-affinity canonical methanotrophs with cultured representatives have been detected along with the high-affinity ones, their role as a methane sink in upland soils remains enigmatic. Here, we show that canonical methanotrophs can contribute to (circum-)atmospheric methane uptake in agricultural soils. We performed a stable-isotope 13C–CH4 labelling incubation in the presence and absence of bio-based residues that were added to the soil to track the flow of methane. Residue amendment transiently stimulated methane uptake rate (<50 days). Soil methane uptake was sustained throughout the incubation (130 days), concomitant to the enrichment of 13C–CO2. The 13C-enriched phospholipid fatty acids (PLFAs) were distinct in both soils, irrespective of amendments, and were unambiguously assigned almost exclusively to canonical alphaproteobacterial methanotrophs with cultured representatives. 16S rRNA and pmoA gene sequence analyses revealed that the as-yet-uncultured high-affinity methanotrophs were virtually absent in these soils. The stable-isotope labelling approach allowed to attribute soil methane uptake to canonical methanotrophs, whereas these were not expected to consume (circum-)atmospheric methane. Our findings thus revealed an overlooked reservoir of high-affinity methane-oxidizers represented by the canonical methanotrophs in agriculture-impacted upland soils. Given that upland agricultural soils have been thought to marginally or do not contribute to atmospheric methane consumption due to the vulnerability of the high-affinity methanotrophs, our findings suggest a thorough revisiting of the contribution of agricultural soils, and the role of agricultural management to mitigation of climate change.

    Differences in PCB accumulation between male and female moles (Talpa europaea) in an area with heterogeneous soil contamination
    Lange, H.J. de; Zweers, H. ; Lammertsma, D.R. ; Faber, J.H. - \ 2013
    In: Proceedings of the 23rd SETA Europa 2013 congres. - - p. 261 - 261.
    The neonicotinoid imidachloprid shows high chronic toxicity to mayfly nymphs
    Roessink, I. ; Merga, L.B. ; Zweers, A.J. ; Brink, P.J. van den - \ 2013
    Environmental Toxicology and Chemistry 32 (2013)5. - ISSN 0730-7268 - p. 1096 - 1100.
    pesticides - water
    The present study evaluated the acute and chronic toxicity of imidacloprid to a range of freshwater arthropods. Mayfly and caddisfly species were most sensitive to short-term imidacloprid exposures (10 tests), whereas the mayflies showed by far the most sensitive response to long-term exposure of all seven arthropod species tested (28-d EC10 values of approximately 0.03¿µg/L). The results indicated a high aquatic risk of chronic exposure of imidacloprid to mayflies.
    Verspreiden van bagger op het land in klei- en veengebieden
    Harmsen, J. ; Rietra, R.P.J.J. ; Groenenberg, J.E. ; Lahr, J. ; Toorn, A. van den; Zweers, H. - \ 2012
    Amersfoort : Stowa (Rapport / STOWA 2012-22) - ISBN 9789057735622 - 150
    baggeren - sloten - veengronden - zware kleigronden - landbouwgrond - bodemkwaliteit - bodemverontreiniging - inventarisaties - dredging - ditches - peat soils - clay soils - agricultural land - soil quality - soil pollution - inventories
    De meeste baggerspecie, inclusief licht verontreinigde baggerspecie die vrijkomt bij onderhoud van watergangen, wordt verspreid op landbouwpercelen. Het in dit rapport beschreven onderzoek is opgezet om op praktijkschaal na te gaan of op dit moment de praktijk van het verspreiden van licht verontreinigde bagger meetbare effecten heeft veroorzaakt en aan te geven wat er in de toekomst kan worden verwacht bij voortzetting van de huidige praktijk. De belangrijkste conclusie van het onderzoek is dat in de onderzochte klei- en veengebieden de praktijk van verspreiden van baggerspecie niet heeft geleid tot een sterke achteruitgang van de bodem. Achteruitgang is echter wel mogelijk als de praktijk van verspreiden meer opschuift in de richting van de kwaliteit die maximaal is toegestaan. Op basis van het onderzoek worden diverse aanbevelingen voor het beleid gemaakt.
    Organohalogen exposure in a Eurasian owl (Bubo bubo) population from Southeastern Spain: Temporal-spatial trends and risk assessment
    Gomez-Ramirez, P. ; Martinez-Lopez, E. ; Garcia-Fernandez, A. ; Zweers, A.J. ; Brink, N.W. van den - \ 2012
    Chemosphere 88 (2012)8. - ISSN 0045-6535 - p. 903 - 911.
    brominated flame retardants - polybrominated diphenyl ethers - polychlorinated-biphenyls - organochlorine contaminants - haliaeetus-albicilla - hieraaetus-pennatus - breeding success - residue levels - great-lakes - eggs
    Polybrominated diphenyl ethers (PBDEs), polychlorinated biphenyls (PCBs) and organochlorine insecticides (OCs) were analysed in 58 Eurasian Eagle owl (Bubo bubo) unhatched eggs collected between 2004 and 2009 in Southeastern Spain. Levels of p,p'-DDE were found to be higher than in eggs laid by other European owls in the same decade, probably due to the greater agricultural activity in our study area. Compared to other European raptors, exposure to PCBs can be considered intermediate, but low to PBDEs. Land use differences and prey availability were the rationale to divide the study area in two subareas in further assessments. Temporal trends of HCB, p,p'-DDE, ß-HCH, PCBs and PBDEs were significantly different in each subarea, generally increasing over time in the Southern but decreasing or remaining stable in the Northern. On the contrary, levels of cyclodienes tended to decrease in both subareas. Dietary shifts with a greater amount of birds are suggested as a cause for increasing organochlorine loads in raptors. This may explain the increasing trend in the Southern territories. However, due to the proximity of most of these nests to Cartagena, an important industrial city, increasing environmental pollution cannot be ruled out. Although average levels of the compounds analysed are below threshold levels, 17% of the samples exceeded 400 pg g-1 ww (wet weight), the LOAEC for Total TEQs. Moreover, a negative correlation between TEQ concentrations and the metabolizable fraction of PCBs (Fprob = 0.0018) was found when TEQs values were above 10 pg g-1 ww. This could be indicative of hepatic enzymes induction in the birds exposed at higher concentrations, which are mainly breeding in the Southern subarea. These females could be suffering from Ah-receptor-related toxic effects, some of which have been related to altered bird reproduction. Finally, a significant negative correlation between p,p'-DDE levels and eggshell thickness (r = -0.469, p <0.001) was observed, with about 17% of eggshell thinning for eggs with p,p'-DDE levels above 100 µg g -1 lw. The persistence of this degree of thinning over a period of time has been related to population declines in other raptor species
    Verspreiden van bagger op het land in klei- en veengebieden
    Harmsen, J. ; Rietra, R.P.J.J. ; Groenenberg, J.E. ; Lahr, J. ; Toorn, A. van den; Zweers, A.J. - \ 2012
    Wageningen : Alterra (Alterra-rapport 2282) - 150
    baggeren - sloten - veengronden - zware kleigronden - landbouwgrond - bodemkwaliteit - bodemverontreiniging - inventarisaties - dredging - ditches - peat soils - clay soils - agricultural land - soil quality - soil pollution - inventories
    De meeste baggerspecie, inclusief licht verontreinigde baggerspecie die vrijkomt bij onderhoud van watergangen, wordt verspreid op landbouwpercelen. Het in dit rapport beschreven onderzoek is opgezet om op praktijkschaal na te gaan of op dit moment de praktijk van het verspreiden van licht verontreinigde bagger meetbare effecten heeft veroorzaakt en aan te geven wat er in de toekomst kan worden verwacht bij voortzetting van de huidige praktijk. De belangrijkste conclusie van het onderzoek is dat in de onderzochte klei- en veengebieden de praktijk van verspreiden van baggerspecie niet heeft geleid tot een sterke achteruitgang van de bodem. Achteruitgang is echter wel mogelijk als de praktijk van verspreiden meer opschuift in de richting van de kwaliteit die maximaal is toegestaan. Op basis van het onderzoek worden diverse aanbevelingen voor het beleid gemaakt.
    Spreading of slightly polluted sediment on agricultural land
    Harmsen, J. ; Groenenberg, B.J. ; Rietra, R.P.J.J. ; Toorn, A. van den; Zweers, H. - \ 2011
    In: Proceedings of CleanUp 2011, 4th International Contaminated site Remediation Conference, Adelaide, Australia, 11-15 September 2011. - Adelaide, Australia : CRC - ISBN 9781921431296 - p. 49 - 50.
    Ecologische effecten van het ontwormingsmiddel ivermectine
    Lahr, J. ; Kats, R.J.M. van; Hout, A. van der; Lammertsma, D.R. ; Werf, D.C. van der; Zweers, A.J. ; Siepel, A. - \ 2011
    Vakblad Natuur Bos Landschap 8 (2011)10. - ISSN 1572-7610 - p. 28 - 31.
    paarden - excreten - veterinaire producten - wormen - ziektebestrijding - bodembiologie - grote grazers - natuurgebieden - ecosystemen - horses - excreta - veterinary products - helminths - disease control - soil biology - large herbivores - natural areas - ecosystems
    Het is inmiddels een bekend feit dat ontwormingsmiddelen die aan vee worden gegeven, giftig kunnen zijn voor de mestfauna, de insecten die zich met mest voeden en er hun eieren in leggen. Het verdwijnen van bepaalde soorten mestfauna kan er in bepaalde gevallen toe leiden dat de afbraak van mest in het veld vertraagd wordt, zo blijkt uit buitenlandse studies. Enquêtes wezen eerder uit dat ontwormingsmiddelen in veel Nederlandse natuurgebieden worden toegediend aan grote grazers. Komen dit soort ecologische effecten dus ook in onze natuurgebieden voor? Dit is de afgelopen jaren door Alterra onderzocht in opdracht van het ministerie van EL&I.
    Measuring shoot length of submerged aquatic plants using graph analysis
    Zweers, A.J. ; Brock, T.C.M. ; Polder, G. ; Hovens, H. ; Roessink, I. ; Wijngaarden, R.P.A. van; Belgers, D. ; Boonstra, H. ; Groenwold, J.G. - \ 2011
    Verwijdering gewasbeschermingsmiddelen uit glastuinbouw effluent
    Jansen, R.M.C. ; Staaij, M. van der; Beltman, W.H.J. ; Zweers, A.J. ; Os, E.A. van; Blok, C. ; Beerling, E.A.M. - \ 2011
    Organochlorine pesticides levels in eagle owl (Bubo bubo) eggs: Temporal trends and sublethal effects
    Gómez-Ramírez, P. ; Martínez-López, E. ; Maria-Mojica, P. ; Espin, S. ; Zweers, H. ; García-Fernández, A.J. ; Brink, N.W. van den - \ 2010
    Toxicology Letters 196 (2010)suppl.. - ISSN 0378-4274 - p. s129 - s129.
    According to the NRC requirements, the eagle owl could be considered a suitable sentinel species for biomonitoring organochlorine pesticides, reflecting both their use and food web transfer. In order to obtain this information from an agricultural area in Southeastern Spain, 58 unhatched eggs from the period 2004–2009 were analysed for 23 organochlorine compounds. Homogenized egg contents were processed with n-hexane, and cleaned up by GPC. Detection and quantification was performed using GC–MS. A homogeneous temporal trend was found for the total of compounds analyzed, with a significant decrease in 2008 (Chi-square = 13.31, p <0.01). On the contrary, lindane (Chi-square = 15.03, p <0.01) and DDT (Chi-square = 9.76, p <0.05) significantly increased along the whole period, reaching higher levels in 2009. Although DDT was banned in Spain in 1971, this compound has been used until 2008 for the synthesis of dicofol, an insecticide recommended for citrus farming in the study area. Previous studies in other raptor species from the same region show a positive correlation between DDT blood levels and citrus, vineyard and olive tree crops, for which dicofol was also recommended. Lindane was banned in Spain in 2000 for agricultural use, and allowed for animal use until December 2007. The increasing levels could reflect a current illegal use of this compound. Eggshell thickness is a good biomarker, inversely correlated with DDE levels in birds. A significant negative correlation was found between eggshell thickness and DDE concentration in our population (P = -0.445, p <0.01) and a 17% of thinning when DDE levels were higher than 100 µg/g (lipid weight). Although other contaminants may cause some eggshell thinning, DDE has been established as the main role.
    Measuring shoot length of submerged aquatic plants using graph analysis
    Polder, G. ; Hovens, H.L.E. ; Zweers, A.J. - \ 2010
    In: Proceedings of the ImageJ User and Developer Conference 2010, Mondorf-les-Bains, Luxembourg, 27-29 October 2010. - Luxembourg : Centre de Recherche Public Henri Tudor - ISBN 9782919941117 - p. 172 - 177.
    (No) effect of oral ivermectin treatment of ponies on dung degradation in semi-natural pastures. A field study
    Lahr, J. ; Kats, R.J.M. van; Hout, A. van der; Zweers, A.J. ; Siepel, A. - \ 2010
    (No) effect of oral ivermectin treatment of ponies on dung degradation in semi-natural pastures. A field study
    Lahr, J. ; Kats, R.J.M. van; Hout, A. van der; Werf, D.C. van der; Zweers, A.J. ; Siepel, A. - \ 2010
    Determination of the neurotoxins BMAA (ß-N-methylamino-L-alanine) and DAB (a-,¿-diaminobutyric acid) by LC-MSMS in Dutch urban waters with cyanobacterial blooms
    Faassen, E.J. ; Gillissen, F. ; Zweers, H. ; Lürling, M.F.L.L.W. - \ 2009
    Amyotrophic Lateral Sclerosis 10 (2009)Suppl. 2. - ISSN 1748-2968 - p. 79 - 84.
    amino-acid - neurodegenerative disease - chamorro people - flying foxes - guam - cycas - biomagnification - als/pdc - dietary - produce
    We aimed to determine concentrations of the neurotoxic amino acids ß-N-methylamino-L-alanine (BMAA) and -,¿-diaminobutyric acid (DAB) in mixed species scum material from Dutch urban waters that suffer from cyanobacterial blooms. BMAA and DAB were analysed in scum material without derivatization by LC-MSMS (liquid chromatography coupled to tandem mass spectrometry) using hydrophilic interaction chromatography (HILIC). Our method showed high selectivity, good recovery of added compounds after sample extraction (86% for BMAA and 85% for DAB), acceptable recovery after sample hydrolysation (70% for BMAA and 56% for DAB) and acceptable precision. BMAA and DAB could be detected at an injected amount of 0.34 pmol. Free BMAA was detected in nine of the 21 sampled locations with a maximum concentration of 42 µg/g DW. Free DAB was detected in two locations with a maximum concentration of 4 µg/g DW. No protein-associated forms were detected. This study is the first to detect underivatized BMAA in cyanobacterial scum material using LC-MSMS. Ubiquity of BMAA in cyanobacteria scums of Dutch urban waters could not be confirmed, where BMAA and DAB concentrations were relatively low; however, co-occurrence with other cyanobacterial neurotoxins might pose a serious health risk including chronic effects from low-level doses
    Ruimere toepassingsmogelijkheden landfarming van verontreinigde baggerspecie : het duurt even, maar de specie wordt echt schoon
    Harmsen, J. ; Zweers, A.J. - \ 2009
    Bodem 19 (2009)5. - ISSN 0925-1650 - p. 7 - 10.
    bodemverontreiniging - baggerspeciedepots - bioremediëring - bodemsanering - sludge farming - soil pollution - spoil banks - bioremediation - soil remediation - sludge farming
    Bijna 20 jaar geleden is op de locatie Kreekraksluizen een experiment gestart om verontreinigde baggerspecie biologisch te reinigen met behulp van landfarming. De gereinigde baggerspecie ligt hier nog steeds en wordt nog gemonitored en dit heeft een unieke waarnemingsreeks opgeleverd
    Resultaten extra PAK metingen aan sediment uit de cores van de laboratorium KL-experimenten, uitgevoerd voor het Deltares naleveringsproject
    Lange, H.J. de; Koelmans, A.A. ; Zweers, H. - \ 2008
    Wageningen, December 2008 : WUR LSG. Aquatische Ecologie - 2 p.
    Waterbodem geanalyseerd op olie : nieuw voorgestelde methode versus oude methode
    Beek, M. ; Pijnenburg, J. ; Zweers, A.J. - \ 2007
    [Lelystad] : Rijkswaterstaat (RWS WD rapport 2007.001) - ISBN 9789036914222 - 28
    mineraaloliën - analytische methoden - kwaliteitsnormen - waterbodems - verontreinigde sedimenten - mineral oils - analytical methods - quality standards - water bottoms - contaminated sediments
    Theory and application of landfarming to remediate polycyclic aromatic hydrocarbons and mineral oil-contaminated sediments: beneficial reuse
    Harmsen, J. ; Rulkens, W.H. ; Sims, R.C. ; Rijtema, P.E. ; Zweers, A.J. - \ 2007
    Journal of Environmental Quality 36 (2007)4. - ISSN 0047-2425 - p. 1112 - 1122.
    organic-compounds - pahs - biodegradation - carbon
    When applying landfarming for the remediation of contaminated soil and sediment, a fraction of the soil-bound contaminant is rapidly degraded; however, a residual concentration may remain, which slowly degrades. Degradation of polycyclic aromatic hydrocarbons (PAHs) and mineral oil can be described using a multi-compartment model and first-order kinetics, in which three degradable fractions are distinguished; (1) rapid, (2) slowly, and (3) very slowly degradable. Using this model populated with data from long-term experiments (initiated in 1990), it is shown that time frames from years to decades can be necessary to clean the soil or sediment to obtain a target below regulatory guidelines. In passive landfarms without active management, three principal potentially limiting factors can be identified: (1) availability of appropriate microorganisms, (2) supply of oxygen for the biodegradation process, and (3) bioavailability of the pollutants to the microorganisms. Bioavailable PAHs and mineral oil are readily biodegradable contaminants under aerobic conditions, and presence and activity of microorganisms are not problems. The other two factors can be limiting and are theoretically described. Using these descriptions, which are in agreement with field experiments of 10 to 15 yr, it is shown if and when optimization of the biodegradation process is an option. Because a long time period is necessary to degrade the slowly and very slowly degradable fractions, passive landfarming should be combined with beneficial use of the land area. Examples include the development of natural environments, use in constructions, growing of biomass for energy production, including biofuels, and use as cover for landfills
    Biodegradation rate of PAHs and mineral oil in sediments on a landfarm
    Harmsen, J. ; Rulkens, W.H. ; Zweers, A.J. ; Toorn, A. van den; Sims, R.C. - \ 2005
    In: Proceedings of the eighth international In situ and on-site bioremediation symposium. - Columbus OH (USA) : Battelle - ISBN 9781574771527 - p. F17 - F17.
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