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.

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Effects of temperature and food source on reproduction and longevity of aphid hyperparasitoids of the genera Dendrocerus and Asaphes
Boer, Jetske G. de; Salis, Lucia ; Tollenaar, Ward ; Heumen, Lisa J.M. van; Costaz, Thibault P.M. ; Harvey, Jeffrey A. ; Kos, Martine ; Vet, Louise E.M. - \ 2019
BioControl 64 (2019)3. - ISSN 1386-6141 - p. 277 - 290.
Aphidius colemani - Fourth trophic level - Hymenoptera - Megaspilidae - Myzus persicae - Pteromalidae

Hyperparasitoids of aphid parasitoids commonly occur in (sweet pepper) greenhouses, and can pose a threat to effective biological control of aphids. Here, we studied life history characteristics of laboratory colonies of Dendrocerus spp. Ratzeburg (Hymenoptera: Megaspilidae) and Asaphes spp. Walker (Pteromalidae) that originated from a commercial sweet pepper greenhouse. We aimed to clarify how these two hyperparasitoid taxa can coexist inside greenhouses. Hyperparasitoids of both taxa have a long lifespan that was extended significantly by food sources that are naturally available in a greenhouse environment, including aphid honeydew and sweet pepper flowers. Differences in sensitivity to decreased or increased temperatures did not appear to explain seasonal patterns in abundance of Dendrocerus spp. and Asaphes spp. in sweet pepper greenhouses. Instead, Dendrocerus spp. may have an advantage early in the season because it thrives on aphid honeydew, while Asaphes spp. may do better later in the season because of its long lifespan and extensive reproductive period.

Ursodeoxycholic acid counteracts celecoxib in reduction of duodenal polyps in patients with familial adenomatous polyposis: a multicentre, randomized controlled trial
Heumen, B.W. van; Roelofs, H.M.J. ; Vink-Börger, M.E. ; Dekker, E. ; Mathus-Vliegen, E.M. ; Dees, J. ; Koornstra, J.J. ; Langers, A.M. ; Nagtegaal, I.D. ; Kampman, E. ; Peters, W.H. ; Nagengast, F.M. - \ 2013
Orphanet Journal of Rare Diseases 8 (2013). - ISSN 1750-1172 - 11 p.
primary sclerosing cholangitis - cyclooxygenase-2 expression - ulcerative-colitis - combination treatment - colorectal adenomas - colon-cancer - cells - management - sulindac - roles
Background Due to prophylactic colectomy, mortality in patients with familial adenomatous polyposis (FAP) has changed, with duodenal cancer currently being the main cause of death. Although celecoxib reduces duodenal polyp density in patients with FAP, its long-term use may increase the risk of cardiovascular events and alternatives need to be explored. Preclinical studies suggest that the combination of celecoxib with ursodeoxycholic acid (UDCA) is a potentially effective strategy. We performed a randomized, double-blind, placebo-controlled trial to investigate the effect of celecoxib and UDCA co-treatment on duodenal adenomatosis in patients with FAP. Methods Patients with FAP received celecoxib (400 mg twice daily) and UDCA (1000-2000 mg daily, ~20-30 mg/kg/day, n=19) or celecoxib and placebo (n=18) orally for 6 months. Primary outcome was drug efficacy, assessed by comparing duodenal polyp density at pre- and post-intervention by blinded review of endoscopic recordings. As secondary outcomes, cell proliferation, apoptosis, and COX-2 levels in normal duodenal mucosa were assessed by immunohistochemistry or real-time quantitative polymerase chain reaction. Results In intention-to-treat analysis, deceased polyp density was observed after celecoxib/placebo treatment (p=0.029), whereas increased polyp density was observed after celecoxib/UDCA treatment (p=0.014). The difference in change in duodenal polyp density was statistically significant between the groups (p=0.011). No changes in secondary outcomes were observed. Thirty patients (81%) reported one or more adverse events, 16 patients (84%, Common Toxicity Criteria for Adverse Events version 3.0 (CTCAE) grade 1–3) treated with celecoxib/UDCA and 14 patients (78%, CTCAE grade 1–2) treated with celecoxib/placebo. Nine patients (24%) discontinued intervention prematurely, 5 patients (26%) treated with celecoxib/UDCA and 4 patients (22%) treated with celecoxib/placebo. Conclusions Celecoxib reduces duodenal polyp density in patients with FAP, and unexpectedly, high dose UDCA co-treatment counteracts this effect. The benefit of long term use of celecoxib for duodenal cancer prevention needs to be weighed against the (risk of) adverse events.
Verspreiding ArMV bij bloembollen
Kock, Maarten de - \ 2012
PlAMV in lelie - Update van 2 jaar praktijkgericht onderzoek
Kock, Maarten de - \ 2012
Worked examples: description of thin section 74251 (Heumen II, Aeric Ochraqualf)
Miedema, R. - \ 1985
In: Handbook for soil thin section description / Bullock, P., - p. 143 - 144.
Vegetatiekundig en oecologisch-geografisch onderzoek van het Quercion robori-petraeae in de Nederlandse zandgebieden ten Zuiden van de Waal
Bakker, J.G. - \ 1969
Wageningen University. Promotor(en): H.J. Venema. - Wageningen : Veenman - 144
loofverliezende bossen - bosecologie - historische ecologie - noord-brabant - rijk van nijmegen - gelderland - limburg - deciduous forests - forest ecology - historical ecology - noord-brabant - rijk van nijmegen - gelderland - limburg
In this thesis are given the results of an investigation of the vegetation, habitat and distribution of the Quercion robori petraeae (oak-birch-woods) in the sandy regions of N-Brabant and Limburg and in the ,Rijk van Nijmegen'. Data obtained from literature and from investigations by the author made in other parts of the Netherlands are compiled.

The investigated area, where the Quercion robori-petraeae must have dominated in the original landscape, covers:
1. North Brabant, except the holocene alluvia in the north western part and along the river Meuse;
2. North and Central Limburg, except the valley of the river Meuse (its southern limit is roughly formed by the line connecting Echt and Koningsbosch);
3. ,Rijk van Nijmegen', which comprises the municipalities of Nijmegen, Ubbergen, Groesbeek, Heumen, Overasselt and Wychen);
4. The borderland east of Brunssum and Schinveld.

To describe the Quercion robori-petraeae use has been made of ,sociological groups of species', viz. groups of species, which show a strong similarity in sociological amplitude.

In chapter two the natural condition in the investigated area is described. The climate is compared to that of the Netherlands: it is relatively warm in summer, with a gradual increase in temperature going eastwards, and relatively mild in winter with a gradual increase in temperature going westwards, while the mean annual precipitation is relatively slight, with decreasing yearly totals going eastwards (par. 2.1). The landscape, except for some peat bogs, is built up of cover sands, low terrace, push morraine, loess, blown sands derived from pleistocene riverterraces or cover sands, old pleistocene terraces and tertiary sands. Short descriptions of distribution, age, origin, topography, texture and the main soil types are given (par. 2.2).

In chapter three a general historical survey of the deciduous forests in the investigated area from the Neolithicum onwards are given. In this period deforestation began. Up to about 700 AD this process in general probably took place very gradually, but from 700-1200 AD the wooded areas were greatly reduced, corresponding with the formation of many settlements. By the late middle ages the landscape had mostly turned into vast stretches of heather, on many places alternated with sand drifts, and so it remained until far into the nineteenth century. Reforestation then started, first mostly with oak coppices, later, in the twentieth century, mostly with conifers. Much of the heaths were reclaimed and also small remnants of the original forests which mostly grew in moist to wet places in the low sandy areas, which are crossed by many brooklets. Thus the present day culture-landscape was formed. Of some of the still existing forests very old data were collected, viz. on those of the push moraine in the ,Rijk van Nijmegen' (the oldest record dates back to Roman times), the ,Echterbosch' (the oldest record is from the early middle ages), the ,Liesbosch', the ,Ulvenhoutsche Bosch' and the ,Mastbosch' (which were recorded for the first time in the late middle ages).

Chapter four deals with the classification of the Quercion robori-petreaea of the Netherlands. The chief criterium used was the floristical composition - as done is by the French-Swiss school, but the accent is placed rather on ,sociological groups of species' than on fidelity' (par. 4. 1). In par. 4.2 a survey is given of the sociological groups in which all the species in the described oak-birchwoods are arranged. To every group the sociological amplitude, the amplitude in connection with the chemical composition of the soil and with the hydrology (the most important environmental factors) and the dynamic indication are added. In par. 4.3 a historical survey of the classification of the Quercion robori-petraeae in the Netherlands is given and discussed. The following new classification is proposed:

Alliance Quercion robori-petraeae
(Sub-alliance Violo-Quercion)
Association Maianthemo-Quercetum ass. nov.
Sub-association Maianthemo-Quercetum anemonetosum subass. nov.
Variant with Athyrium filix-femina var. nov.
Soil: relatively very rich; (moist to) wet
Typical variant var. nov.
Soil: relatively very rich; retaining moisture to moist
Variant with Convallaria majalis var. nov.
Soil: (moderately rich to) relatively rich; dry to moisture-retaining (sometimes somewhat moist)
Sub-association Maianthemo-Quercetum typicum subass. nov.
Variant with Blechnum spicant var. nov.
Soil: moderately rich (to relatively rich); (moist to) wet
Variant with Molinia caerulea var. nov.
Soil: poor (to moderately rich); moist (to wet)
Variant with Polypodium vulgare var. nov.
Soil: poor to moderately rich; dry to moisture-retaining (sometimes somewhat moist)
(Sub-alliance Vaccinio-Quercion)
Association Querceto-Betuletum TÜXEN 1930 em. DOING 1962
Variant with Molinia caerulea var. nov.
Soil: poor; moist to wet
Variant with Festuca tenuifolia var. nov.
Soil: poor; dry to moisture-retaining (sometimes somewhat moist)

In chapter five the distribution of the Maianthemo-Quercetum and the Querceto- Betuletum outside the Netherlands is given. Both associations occur chiefly in the Northern Atlantic of Europe.

In chapter six the Quercion robori-petraeae of the Netherlands is described. In par. 6.1 the vegetation-analysis is explained. The (abundance-)dominance of the author's records from the investigated area is determined with the aid of the scale Of SEGAL and BARKMAN (pg. 0 W ); for all the other records the traditional BRAUN-BLANQUET scale in six parts was used.

In the eight tables in which the floristical diversion of the variants is rendered (appendages 1-8) the species are placed in sociological groups (for the composition and sequence of these groups cf. par. 4.2) and the records according to their geographical origin, for which the following regions are distinguished (mostly plant-geographical districts or subdistricts; cf. par. 6.2):

Campine district (Ke)
Low terraces of North and Central Limburg, North-east Brabant and the ,Rijk van Nijmegen' and also the Pliocene border country east of Brunssum and Schinveld (S1)
Push moraine of the,Rijk van Nijmegen'(S2)
Veluwezoom from Doorwerth to Dieren (S3)
Eastern part of the Achterhoek (S4)
South-eastTwente (S5)
South Limburg (ZL)
Valley of the IJssel (G1)
Veluwe, Utrechtse Heuvelrug and the Gooi (G2)
Guelders Valley (G3)
Drenthian district (Dr)
Coastal area (K).

In par. 6.3 particulars on the flora of the Quercion robori-petraeae in the investigated area are given.

In par. 6.4 the different variants are described in detail. These descriptions refer to the occurrence in the investigated area in the first part and in other parts of the Netherlands in the second part.

The first part deals with:
a. Data from the vegetation-records (date and number of each record; name of the woodland and of the municipality, coordinates on the topographical map; topography; geological formation and soil type; history of the wood and the surrounding landscape).
b. Floristical survey.
c. Habitat and distribution.

The second part deals with:
a. Data from the records of the vegetation (less systematical and detailed than those of the investigated area).
b. Distribution and geographical differentiation.

In Par. 6.5 the described oak-birch-woods in the Netherlands are subjected to a closer scruting: their geographical variation is described by means of local vicariants, which are based on specific combinations of geographically differential species, or occasionnally on one such a differential species. In conclusion a survey is given of the oak-birch woods in the investigated area, which are quite possibly remnants of original forests.
Iets over de geschiktheid voor tuinbouwdoeleinden van de gronden ten oosten van het Maas-Waalkanaal tussen Heumen en Hatert
Pons, L.J. - \ 1950
Wageningen : STIBOKA (Rapport / Stichting voor Bodemkartering no. 251) - 6
tuinbouw - grondvermogen - landevaluatie - bodemgeschiktheid - nederland - rijk van nijmegen - gelderland - horticulture - land capability - land evaluation - soil suitability - netherlands
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