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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    Nest defence and offspring provisioning in a cooperative bird : individual subordinates vary in total contribution, but no division of tasks among breeders and subordinates
    Teunissen, Niki ; Kingma, Sjouke A. ; Peters, Anne - \ 2020
    Behavioral Ecology and Sociobiology 74 (2020)7. - ISSN 0340-5443
    Altruism - Cooperation - Parental care - Predation - Predator defence - Task division

    Abstract: Research aimed at understanding the evolution of costly, seemingly altruistic helping behaviour in cooperative birds has strongly focused on a single aspect of helping—offspring provisioning. However, various other activities are also important for successful breeding, most notably nest defence, and emphasis on a single aspect of helping might hamper a full understanding of the evolutionary drivers of cooperation and seemingly altruistic helping behaviour. Nonetheless, the extent to which social classes (i.e. dominant breeders and subordinate helpers), as well as different individuals within social classes, divide tasks in cooperative groups remains largely unknown. Here we tested whether individual purple-crowned fairy-wrens, Malurus coronatus, show task division in the two forms of costly offspring care important for reproductive success: nestling provisioning and nest defence (to predator models presented at nests). Subordinates and breeders generally contributed to both tasks. Breeders defended marginally more than subordinates, and provisioned at a consistently high level, irrespective of their individual contribution to defence, whereas subordinates’ investment in both types of care was positively correlated. Thus, we found no evidence for division of tasks between or within social classes, highlighting it may be absent in facultatively cooperative birds even when activities are costly and important for reproduction. This suggests that in such species, cooperative improvement of overall investment may be more effective than enhanced individual efficiency at different tasks. Significance statement: In many social species, cooperation between individuals to achieve communal goals is important for successful reproduction. When multiple individuals are working together, division of tasks can occur, with tasks unevenly distributed among group members. Research on cooperative breeding, where subordinate helpers seemingly altruistically assist others in raising their young, has however mainly focused on offspring provisioning, while subordinates can often contribute to several breeding tasks. Thus, if task divisioning occurs, this would call into question conclusions about adaptive benefits of helping based on provisioning effort alone. Here we use nestling feeding watches and predator model presentations at nests to quantify nestling provisioning and nest defence effort by individuals in a classical cooperative breeder, the purple-crowned fairy-wren. We show a lack of task divisioning by breeders and subordinates, which is reassuring for our current understanding of the evolution of cooperative breeding.

    Heritability estimates for 361 blood metabolites across 40 genome-wide association studies
    Hagenbeek, Fiona A. ; Pool, René ; Dongen, Jenny van; Draisma, H.M. ; Jan Hottenga, Jouke ; Willemsen, Gonneke ; Abdellaoui, Abdel ; Fedko, Iryna O. ; Braber, Anouk den; Visser, Pieter Jelle ; Geus, Eco J.C.N. de; Willems van Dijk, Ko ; Verhoeven, Aswin ; Suchiman, H.E. ; Beekman, Marian ; Slagboom, P.E. ; Duijn, Cornelia M. van; Barkey Wolf, J.J.H. ; Cats, D. ; Amin, N. ; Beulens, J.W. ; Bom, J.A. van der; Bomer, N. ; Demirkan, A. ; Hilten, J.A. van; Meessen, J.M.T.A. ; Moed, M.H. ; Fu, J. ; Onderwater, G.L.J. ; Rutters, F. ; So-Osman, C. ; Flier, W.M. van der; Heijden, A.A.W.A. van der; Spek, A. van der; Asselbergs, F.W. ; Boersma, E. ; Elders, P.M. ; Geleijnse, J.M. ; Ikram, M.A. ; Kloppenburg, M. ; Meulenbelt, I. ; Mooijaart, S.P. ; Nelissen, R.G.H.H. ; Netea, M.G. ; Penninx, B.W.J.H. ; Stehouwer, C.D.A. ; Teunissen, C.E. ; Terwindt, G.M. ; Jukema, J.W. ; Reinders, M.J.T. - \ 2020
    Nature Communications 11 (2020)1. - ISSN 2041-1723

    The original version of the Supplementary Information associated with this Article included an incorrect Supplementary Data 1 file, in which additional delimiters were included in the first column for a number of rows, resulting in column shifts for some of these rows. The HTML has been updated to include a corrected version of Supplementary Data 1; the original incorrect version of Supplementary Data 1 can be found as Supplementary Information associated with this Correction. In addition, the original version of this Article contained an error in the author affiliations. An affiliation of Abdel Abdellaoui with Department of Psychiatry, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands was inadvertently omitted. This has now been corrected in both the PDF and HTML versions of the Article.

    Antifouling Polymer Brushes via Oxygen-Tolerant Surface-Initiated PET-RAFT
    Kuzmyn, Andriy R. ; Nguyen, Ai T. ; Teunissen, Lucas W. ; Zuilhof, Han ; Baggerman, Jacob - \ 2020
    Langmuir 36 (2020)16. - ISSN 0743-7463 - p. 4439 - 4446.

    This work presents a new method for the synthesis of antifouling polymer brushes using surface-initiated photoinduced electron transfer-reversible addition-fragmentation chain-transfer polymerization with eosin Y and triethanolamine as catalysts. This method proceeds in an aqueous environment under atmospheric conditions without any prior degassing and without the use of heavy metal catalysts. The versatility of the method is shown by using three chemically different monomers: oligo(ethylene glycol) methacrylate, N-(2-hydroxypropyl)methacrylamide, and carboxybetaine methacrylamide. In addition, the light-triggered nature of the polymerization allows the creation of complex three-dimensional structures. The composition and topological structuring of the brushes are confirmed by X-ray photoelectron spectroscopy and atomic force microscopy. The kinetics of the polymerizations are followed by measuring the layer thickness with ellipsometry. The polymer brushes demonstrate excellent antifouling properties when exposed to single-protein solutions and complex biological matrices such as diluted bovine serum. This method thus presents a new simple approach for the manufacturing of antifouling coatings for biomedical and biotechnological applications.

    Long-eared Owis breeding on Madeira in 2019 - recent colonisation or never discovered population?
    Bemmelen, R.S.A. van; Teunissen, W. ; Lagerveld, S. - \ 2020
    Dutch Birding 42 (2020)2. - ISSN 0167-2878 - p. 75 - 80.
    Invloed greppel-plasdras op kuikenoverleving kievit
    Melman, Dick ; Kleyheeg, Erik ; Visser, Tim ; Oosterveld, Ernst ; Roodbergen, Maja ; Teunissen, Wolf ; Slier, Thalisa - \ 2020
    Driebergen : VBNE, Vereniging van Bos- en Natuurterreineigenaren (Sovon rapport S2020/12) - 54
    Heritability estimates for 361 blood metabolites across 40 genome-wide association studies
    Hagenbeek, Fiona A. ; Pool, René ; Dongen, Jenny van; Draisma, Harmen H.M. ; Hottenga, Jouke Jan ; Willemsen, Gonneke ; Abdellaoui, Abdel ; Fedko, Iryna O. ; Braber, Anouk den; Visser, Pieter Jelle ; Geus, Eco J.C.N. de; Willems van Dijk, Ko ; Verhoeven, Aswin ; Suchiman, H.E. ; Beekman, Marian ; Slagboom, Eline P. ; Duijn, Cornelia M. van; Barkey Wolf, J.J.H. ; Cats, D. ; Amin, N. ; Beulens, J.W. ; Bom, J.A. van der; Bomer, N. ; Demirkan, A. ; Hilten, J.A. van; Meessen, J.M.T.A. ; Moed, M.H. ; Fu, J. ; Onderwater, G.L.J. ; Rutters, F. ; So-Osman, C. ; Flier, W.M. van der; Heijden, A.A.W.A. van der; Spek, A. van der; Asselbergs, F.W. ; Boersma, E. ; Elders, P.M. ; Geleijnse, J.M. ; Ikram, M.A. ; Kloppenburg, M. ; Meulenbelt, I. ; Mooijaart, S.P. ; Nelissen, R.G.H.H. ; Netea, M.G. ; Penninx, B.W.J.H. ; Stehouwer, C.D.A. ; Teunissen, C.E. ; Terwindt, G.M. ; Jukema, J.W. ; Reinders, M.J.T. - \ 2020
    Nature Communications 11 (2020)1. - ISSN 2041-1723

    Metabolomics examines the small molecules involved in cellular metabolism. Approximately 50% of total phenotypic differences in metabolite levels is due to genetic variance, but heritability estimates differ across metabolite classes. We perform a review of all genome-wide association and (exome-) sequencing studies published between November 2008 and October 2018, and identify >800 class-specific metabolite loci associated with metabolite levels. In a twin-family cohort (N = 5117), these metabolite loci are leveraged to simultaneously estimate total heritability (h2 total), and the proportion of heritability captured by known metabolite loci (h2 Metabolite-hits) for 309 lipids and 52 organic acids. Our study reveals significant differences in h2 Metabolite-hits among different classes of lipids and organic acids. Furthermore, phosphatidylcholines with a high degree of unsaturation have higher h2 Metabolite-hits estimates than phosphatidylcholines with low degrees of unsaturation. This study highlights the importance of common genetic variants for metabolite levels, and elucidates the genetic architecture of metabolite classes.

    Olfactory and gustatory functioning and food preferences of patients with Alzheimer’s disease and mild cognitive impairment compared to controls: the NUDAD project
    Doorduijn, A.S. ; Schueren, M.A.E. de van der; Rest, O. van de; Leeuw, F.A. de; Fieldhouse, J.L.P. ; Kester, M.I. ; Teunissen, C.E. ; Scheltens, P. ; Flier, W.M. van der; Visser, M. ; Boesveldt, S. - \ 2020
    Journal of Neurology 267 (2020)1. - ISSN 0340-5354 - p. 144 - 152.
    Cognition - Dementia - Malnutrition - Older adults

    Our aim is to compare olfactory and gustatory function and food preferences of patients with Mild Cognitive Impairment (MCI) and Alzheimer’s disease (AD) with controls. We included 22 patients with MCI, 30 patients with AD and 40 controls and assessed olfactory threshold, odor discrimination and odor identification (Sniffin’ Sticks), gustatory functioning (Taste Strips), and food preferences (Macronutrient and Taste Preference Ranking Task). Linear regression analyses were used to study associations of five cognitive domains or AD biomarkers with olfactory functioning. Groups did not differ in olfactory threshold, gustatory function and food preferences. Patients with MCI and AD scored lower on odor discrimination and identification than controls. Poorer memory, but no other cognitive domain, was associated with poorer odor discrimination and odor identification, but not with odor threshold. No associations with AD biomarkers were found. In conclusion, patients with MCI and AD have poorer odor discrimination and identification ability than controls, but similar detection thresholds. This is likely a consequence of poorer memory rather than directly caused by AD pathology.

    Beheer van vogels in akkerland en kleinschalig cultuurland
    Teunissen, Wolf A. ; Melman, T.C.P. - \ 2019
    Vakblad Natuur Bos Landschap (2019)158. - ISSN 1572-7610 - p. 22 - 25.
    Associations of AD biomarkers and cognitive performance with nutritional status: The NUDAD project
    Doorduijn, Astrid S. ; Visser, Marjolein ; Rest, Ondine van de; Kester, Maartje I. ; Leeuw, Francisca A. de; Boesveldt, Sanne ; Fieldhouse, Jay L.P. ; Heuvel, Ellen G.H.M. van den; Teunissen, Charlotte E. ; Scheltens, Philip ; Flier, Wiesje M. van der; Schueren, Marian A.E. de van der - \ 2019
    Nutrients 11 (2019)5. - ISSN 2072-6643
    Alzheimer’s disease - Body composition - Malnutrition - Mild cognitive impairment - Older adults - Subjective cognitive decline

    As malnutrition is common in patients with Alzheimer’s disease (AD), we evaluated nutritional status and body composition of patients with AD, mild cognitive impairment (MCI) and controls, and studied associations of AD biomarkers and cognitive performance with nutritional status and body composition. We included 552 participants, of which 198 patients had AD, 135 patients had MCI and 219 controls. We assessed nutritional status (mini nutritional assessment (MNA)) and body composition (body mass index (BMI), fat-free mass (FFM) and waist circumference). Linear regression analyses (adjusted for age, gender and education where appropriate) were applied to test associations of AD biomarkers and cognitive performance on five domains with nutritional parameters (dependent). Patients with MCI and AD had a lower BMI and MNA score than controls. Worse performance in all cognitive domains was associated with lower MNA score, but not with body composition. AD biomarkers were associated with MNA score, BMI and waist circumference, and associations with MNA score remained after adjustment for cognitive performance. Both AD biomarkers and cognitive performance were associated with nutritional status, associations with AD biomarkers remained after adjustment for cognition. Our data suggest that malnutrition is not only related to impaired cognition but also to AD pathology.

    Innovatievermogen van het Rotterdam Food Cluster : bedrijvigheid en vernieuwing in het verleden, heden en de Next Economy
    Wubben, E.F.M. ; Huisink, W. ; Kooten, O. van; Huisink, W. ; Bram, E. ; Haren, J. van; Teunissen, D. ; Weerdt, N.P. van der - \ 2018
    Rotterdam : - 124 p.
    De derde industriële revolutie zal ook op de voedingsmiddelenindustrie van grote invloed zijn. Bedrijven uit de keten, van primaire producenten tot verwerkende industrie, handel en logistiek, worden geconfronteerd met majeure uitdagingen. Dat zien we nu al en zal in de nabije toekomst nog sterker voelbaar worden. Deze ‘agribusiness’ bedrijven zullenook een belangrijke rol moeten spelen in de oplossing van mondiale voedselvraagstukken en de transitie naar een circulaire economie. De vraag is daarom niet óf de keten moet veranderen, maar hoe? En wie zullen daarbij voorop gaan?
    Novel Selectivity-Based Forensic Toxicological Validation of a Paper Spray Mass Spectrometry Method for the Quantitative Determination of Eight Amphetamines in Whole Blood
    Teunissen, Sebastiaan F. ; Fedick, Patrick W. ; Berendsen, Bjorn J.A. ; Nielen, Michel W.F. ; Eberlin, Marcos N. ; Graham Cooks, R. ; Asten, Arian C. van - \ 2017
    Journal of the American Society for Mass Spectrometry 28 (2017)12. - ISSN 1044-0305 - p. 2665 - 2676.
    Amphetamines - Forensic toxicology - Paper spray mass spectrometry - Selectivity - Validation - Whole blood
    Paper spray tandem mass spectrometry is used to identify and quantify eight individual amphetamines in whole blood in 1.3 min. The method has been optimized and fully validated according to forensic toxicology guidelines, for the quantification of amphetamine, methamphetamine, 3,4-methylenedioxyamphetamine (MDA), 3,4-methylenedioxy-N-methylamphetamine (MDMA), 3,4-methylenedioxy-N-ethylamphetamine (MDEA), para-methoxyamphetamine (PMA), para-methoxymethamphetamine (PMMA), and 4-fluoroamphetamine (4-FA). Additionally, a new concept of intrinsic and application-based selectivity is discussed, featuring increased confidence in the power to discriminate the amphetamines from other chemically similar compounds when applying an ambient mass spectrometric method without chromatographic separation. Accuracy was within ±15% and average precision was better than 15%, and better than 20% at the LLOQ. Detection limits between 15 and 50 ng/mL were obtained using only 12 μL of whole blood. [Figure not available: see fulltext.].
    Weidevogels - op weg naar kerngebieden
    Melman, T.C.P. ; Teunissen, Wolf A. ; Guldemond, J.A. - \ 2016
    In: Agrarisch natuurbeheer in Nederland / de Snoo, G.R., Melman, Th.C.P., Brouwer, F.M., van der Weijden, W.J., Udo de Haes, H.A., Wageningen Academic Publishers - ISBN 9789086862818 - p. 137 - 161.
    Concentrating or scattering management in agricultural landscapes : Examining the effectiveness and efficiency of conservation measures
    Hammers, Martijn ; Müskens, Gerard J.D.M. ; Kats, Ruud J.M. van; Teunissen, Wolf A. ; Kleijn, David - \ 2016
    Agriculture, Ecosystems and Environment 235 (2016). - ISSN 0167-8809 - p. 51 - 60.
    Conservation management - Farmland biodiversity - Seed-eating farmland birds - Species-specific responses - Wild bird seed mixtures - Winter food availability

    A key issue in conservation is where and how much management should be implemented to obtain optimal biodiversity benefits. Cost-effective conservation requires knowledge on whether biodiversity benefits are higher when management is concentrated in a few core areas or scattered across the landscape, and how these effects vary between species. To address these questions, we examined species-specific behavioural responses of over-wintering farmland birds to enhanced seed availability. In a two-year experiment we first examined the relationship between landscape-scale seed availability and farmland bird density. Then we investigated the relative resource delivery (difference in bird densities between landscapes with and without additional management) and the efficiency (number of individuals supported per unit management) of conservation actions, both at the landscape-scale (ca 100 ha) and at the scale of the conservation measures (3.6 ha). The conservation actions were targeted towards ten seed-eating farmland bird species, but we also considered the responses of seven non-targeted and more generalist seed-eating species, seven species that are less dependent on seeds and three species of birds of prey. We found a positive relationship between bird density and landscape-scale seed availability for eleven species and, for four of these species, the slope of this relationship changed before and after a threshold seed density. For two seed-eating specialists, the number of individuals using conservation patches declined with landscape-scale seed availability. In addition, we found that the relative resource delivery declined with landscape scale seed availability for three seed-eating specialists and was independent of landscape-scale seed availability in four other species. Our results suggest that farmland specialists may benefit most from winter food additions if conservation actions result in high landscape-scale seed availability. This may be achieved by concentrating conservation measures or by establishing measures in areas with high baseline seed availability. By contrast, species that can utilize a wider range of habitats and resources may benefit more from scattering measures across larger areas. Therefore, optimal management for the full range of farmland birds in wintertime may require a combination of core areas with concentrated management and more widely distributed smaller patches of conservation measures.

    Effect of increased protein intake on renal acid load and renal hemodynamic responses
    Teunissen-Beekman, Karianna F.M. ; Dopheide, Janneke ; Geleijnse, Marianne ; Bakker, Stephan J.L. ; Brink, Elizabeth J. ; Leeuw, Peter W. de; Baak, Marleen A. van - \ 2016
    Physiological Reports 4 (2016)5. - ISSN 2051-817X - 10 p.
    Acid load - Carbohydrate - Glomerular filtration rate - Kidney - Protein

    Increased protein intake versus maltodextrin intake for 4 weeks lowers blood pressure. Concerns exist that high-protein diets reduce renal function. Effects of acute and 4-week protein intake versus maltodextrin intake on renal acid load, glomerular filtration rate and related parameters were compared in this study. Seventy-nine overweight individuals with untreated elevated blood pressure and normal kidney function were randomized to consume a mix of protein isolates (60 g/day) or maltodextrin (60 g/day) for 4 weeks in energy balance. Twenty-four-hour urinary potential renal acid load (uPRAL) was compared between groups. A subgroup (maltodextrin N = 27, protein mix N = 25) participated in extra test days investigating fasting levels and postprandial effects of meals supplemented with a moderate protein- or maltodextrin-load on glomerular filtration rate, effective renal plasma flow, plasma renin, aldosterone, pH, and bicarbonate. uPRAL was significantly higher in the protein group after 4 weeks (P ≤ 0.001). Postprandial filtration fraction decreased further after the protein-supplemented breakfast than after the maltodextrin-supplemented breakfast after 4 weeks of supplementation (P ≤ 0.001). Fasting and postprandial levels of glomerular filtration rate, effective renal plasma flow, renin, aldosterone, angiotensin-converting enzyme, pH and bicarbonate did not differ between groups. In conclusion, 4 weeks on an increased protein diet (25% of energy intake) increased renal acid load, but did not affect renal function. Postprandial changes, except for filtration fraction, also did not differ between groups. These data suggest that a moderate increase in protein intake by consumption of a protein mix for 4 weeks causes no (undesirable) effects on kidney function in overweight and obese individuals with normal kidney function.

    The Missing Stakeholder Group : Why Patients Should be Involved in Health Economic Modelling
    Voorn, G.A.K. van; Vemer, Pepijn ; Hamerlijnck, Dominique ; Ramos, Isaac Corro ; Teunissen, G.J. ; Al, Maiwenn ; Feenstra, T.L. - \ 2016
    Applied Health Economics and Health Policy 14 (2016)2. - ISSN 1175-5652 - p. 129 - 133.

    Evaluations of healthcare interventions, e.g. new drugs or other new treatment strategies, commonly include a cost-effectiveness analysis (CEA) that is based on the application of health economic (HE) models. As end users, patients are important stakeholders regarding the outcomes of CEAs, yet their knowledge of HE model development and application, or their involvement therein, is absent. This paper considers possible benefits and risks of patient involvement in HE model development and application for modellers and patients. An exploratory review of the literature has been performed on stakeholder-involved modelling in various disciplines. In addition, Dutch patient experts have been interviewed about their experience in, and opinion about, the application of HE models. Patients have little to no knowledge of HE models and are seldom involved in HE model development and application. Benefits of becoming involved would include a greater understanding and possible acceptance by patients of HE model application, improved model validation, and a more direct infusion of patient expertise. Risks would include patient bias and increased costs of modelling. Patient involvement in HE modelling seems to carry several benefits as well as risks. We claim that the benefits may outweigh the risks and that patients should become involved.

    Dietary proteins improve endothelial function under fasting conditions but not in the postprandial state, with no effects on markers of low-grade inflammation
    Teunissen-Beekman, K.F.M. ; Dopheide, J. ; Geleijnse, J.M. ; Bakker, S.J. ; Brink, E.J. ; Leeuw, P.W. de; Schalkwijk, C.G. ; Baak, M.A. van - \ 2015
    The British journal of nutrition 114 (2015)11. - ISSN 0007-1145 - p. 1819 - 1828.
    Endothelial dysfunction (ED) and low-grade inflammation (LGI) have a role in the development of CVD. The two studies reported here explored the effects of dietary proteins and carbohydrates on markers of ED and LGI in overweight/obese individuals with untreated elevated blood pressure. In the first study, fifty-two participants consumed a protein mix or maltodextrin (3×20 g/d) for 4 weeks. Fasting levels and 12 h postprandial responses of markers of ED (soluble intercellular adhesion molecule 1 (sICAM), soluble vascular cell adhesion molecule 1 (sVCAM), soluble endothelial selectin and von Willebrand factor) and markers of LGI (serum amyloid A, C-reactive protein and sICAM) were evaluated before and after intervention. Biomarkers were also combined into mean Z-scores of ED and LGI. The second study compared 4 h postprandial responses of ED and LGI markers in forty-eight participants after ingestion of 0·6 g/kg pea protein, milk protein and egg-white protein. In addition, postprandial responses after maltodextrin intake were compared with a protein mix and sucrose. The first study showed significantly lower fasting ED Z-scores and sICAM after 4 weeks on the high-protein diet (P=0·02). The postprandial studies found no clear differences of ED and LGI between test meals. However, postprandial sVCAM decreased more after the protein mix compared with maltodextrin in both studies (P=0·04). In conclusion, dietary protein is beneficial for fasting ED, but not for fasting LGI, after 4 weeks of supplementation. On the basis of Z-scores, postprandial ED and LGI were not differentially affected by protein sources or carbohydrates.
    Samen met collectieven 'lerend beheren'
    Schotman, A.G.M. ; Ottburg, F.G.W.A. ; Poelmans, W. ; Teunissen, A. - \ 2015
    Vakblad Natuur Bos Landschap 2015 (2015)5. - ISSN 1572-7610 - p. 24 - 29.
    agrarisch natuurbeheer - landschapselementen - struiken - ecotypen - stilstaand water - habitats - noord-brabant - agri-environment schemes - landscape elements - shrubs - ecotypes - standing water - habitats - noord-brabant
    In 2014 moesten de provincies een concept ontwerp-Natuurbeheerplan 2016 opstellen. De provincie geeft daarin aan wat ze waar wil bereiken. Alterra heeft de provincie Noord-Brabant hierbij geholpen. In de provincie Noord-Brabant was al enorm veel kennis over agrarisch natuurbeheer. De vraag was vooral hoe je die kennis bij de nieuwe spelers krijgt en hoe je het nieuwe natuurbeheerplan formuleert zodat het voldoet aan de eisen die de stelselherziening stelt. Passend binnen het ‘korset’ van de agrarische natuurtypen en het nationaal doelenkader. Het is een gezamenlijke zoektocht geworden met een handreiking voor de collectieven als resultaat. Dit is ‘maatwerk voor Noord-Brabant’.
    Phylogenetic relationships within Fritillaria section Petilium based on AFLP fingerprints
    Wietsma, W.A. ; Deinum, D. ; Teunissen, H. ; Berg, R.G. van den - \ 2015
    Plant Systematics and Evolution 301 (2015)3. - ISSN 0378-2697 - p. 1043 - 1054.
    liliaceae - dna
    Fritillaria sect. Petilium (Fritillaria L., Liliaceae), consists of four species: F. chitralensis, F. eduardii, F. imperialis and F. raddeana. We studied their phylogenetic relationships with AFLP’s, crossing experiments and morphological observations. The AFLP data confirm that F. eduardii is a separate species and not a variety of F. imperialis. Within F. eduardii the two earlier distinguished varieties can indeed be recognised. Our AFLP results also show that F. chitralensis, originally described as F. imperialis var. chitralensis, is different from F. imperialis and is a species in its own right. The results of the AFLP’s and the crossing experiments show that within F. imperialis two varieties can be recognised, one variety containing representatives that possesses the so called ‘foxy’ smell, and a second variety with odourless representatives. A new name for this odourless variety is proposed
    Ecological contrasts drive responses of wintering farmland birds to conservation management
    Hammers, M. ; Muskens, G.J.D.M. ; Kats, R.J.M. van; Teunissen, W.A. ; Kleijn, D. - \ 2015
    Ecography 38 (2015)8. - ISSN 0906-7590 - p. 813 - 821.
    agri-environment schemes - agricultural intensification - biodiversity - populations - grassland - food - metaanalysis - communities - diversity - declines
    In the past decades, large-scale conservation programs have been implemented to halt the decline of farmland species. The mechanisms explaining the effectiveness of these programs remain poorly understood. Here we test the recent hypothesis that the effects of conservation management are determined by the ecological contrasts in limiting resources they create relative to the baseline situation. We examine responses of wintering seed-eating farmland birds to the experimental establishment of winter food plots in areas with contrasting food availability. We found that farmland bird abundance and species richness were strongly positively related to seed availability, regardless of compositional differences between agricultural landscapes. In line with the ecological contrast hypothesis, the responses of wintering farmland birds increased with increasing conservation induced contrast in a key limiting resource. Both contrasts and relative responses were negatively related to baseline food availability, but the absolute bird density in food plots was unrelated to baseline food availability. This indicates that both relative and absolute effects of conservation management need to be considered to properly evaluate the effectiveness of conservation management.
    Differential effects of proteins and carbohydrates on postprandial blood pressure-related responses
    Teunissen-Beekman, K.F.M. ; Dopheide, J. ; Geleijnse, J.M. ; Bakker, S.J.L. ; Brink, E.J. ; Leeuw, P.W. de; Serroyen, J. ; Baak, M.A. van - \ 2014
    The British journal of nutrition 112 (2014)4. - ISSN 0007-1145 - p. 600 - 608.
    randomized controlled-trials - plasma amino-acids - healthy-subjects - insulin responses - dietary-protein - overweight adults - energy-intake - whey-protein - glucose - fructose
    Diet composition may affect blood pressure (BP), but the mechanisms are unclear. The aim of the present study was to compare postprandial BP-related responses to the ingestion of pea protein, milk protein and egg-white protein. In addition, postprandial BP-related responses to the ingestion of maltodextrin were compared with those to the ingestion of sucrose and a protein mix. We hypothesised that lower postprandial total peripheral resistance (TPR) and BP levels would be accompanied by higher plasma concentrations of nitric oxide, insulin, glucagon-like peptide 1 (GLP-1) and glucagon. On separate occasions, six meals were tested in a randomised order in forty-eight overweight or obese adults with untreated elevated BP. Postprandial responses of TPR, BP and plasma concentrations of insulin, glucagon, GLP-1 and nitrite, nitroso compounds (RXNO) and S-nitrosothiols (NOx) were measured for 4 h. No differences were observed in TPR responses. Postprandial BP levels were higher after the ingestion of the egg-white-protein meal than after that of meals containing the other two proteins (P
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