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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Data from: Reanalyzing the Palaeoptera problem - the origin of insect flight remains obscure
Simon, S. ; Blanke, Alexander ; Meusemann, Karen - \ 2018
transcriptomics - phylogenomics - homologization - odonata - ephemeroptera - neoptera - palaeoptera - chiastomyaria - metapterygota
The phylogenetic relationships of the winged insect lineages – mayflies (Ephemeroptera), damselflies and dragonflies (Odonata), and all other winged insects (Neoptera) – are still controversial with three hypotheses supported by different datasets: Palaeoptera, Metapterygota and Chiastomyaria. Here, we reanalyze available phylogenomic data with a focus on detecting confounding and alternative signal. In this context, we provide a framework to quantitatively evaluate and assess incongruent molecular phylogenetic signal inherent in phylogenomic datasets. Despite overall support for the Palaeoptera hypothesis, we also found considerable signal for Chiastomyaria, which is not easily detectable by standardized tree inference approaches. Analyses of the accumulation of signal across gene partitions showed that signal accumulates gradually. However, even in case signal only slightly supported one over the other hypothesis, topologies inferred from large datasets switch from statistically strongly supported Palaeoptera to strongly supported Chiastomyaria. From a morphological point of view, Palaeoptera currently appears to be the best-supported hypothesis; however, recent analyses were restricted to head characters. Phylogenetic approaches covering all organ systems including analyses of potential functional or developmental convergence are still pending so that the Palaeoptera problem has to be considered an open question in insect systematics.
Reanalyzing the Palaeoptera problem – The origin of insect flight remains obscure
Simon, Sabrina ; Blanke, Alexander ; Meusemann, Karen - \ 2018
Arthropod Structure & Development 47 (2018)4. - ISSN 1467-8039 - p. 328 - 338.
Chiastomyaria - Homologization - Metapterygota - Palaeoptera - Phylogenomics - Transcriptomics

The phylogenetic relationships of the winged insect lineages – mayflies (Ephemeroptera), damselflies and dragonflies (Odonata), and all other winged insects (Neoptera) – are still controversial with three hypotheses supported by different datasets: Palaeoptera, Metapterygota and Chiastomyaria. Here, we reanalyze available phylogenomic data with a focus on detecting confounding and alternative signal. In this context, we provide a framework to quantitatively evaluate and assess incongruent molecular phylogenetic signal inherent in phylogenomic datasets. Despite overall support for the Palaeoptera hypothesis, we also found considerable signal for Chiastomyaria, which is not easily detectable by standardized tree inference approaches. Analyses of the accumulation of signal across gene partitions showed that signal accumulates gradually. However, even in case signal only slightly supported one over the other hypothesis, topologies inferred from large datasets switch from statistically strongly supported Palaeoptera to strongly supported Chiastomyaria. From a morphological point of view, Palaeoptera currently appears to be the best-supported hypothesis; however, recent analyses were restricted to head characters. Phylogenetic approaches covering all organ systems including analyses of potential functional or developmental convergence are still pending so that the Palaeoptera problem has to be considered an open question in insect systematics.

Assessing the impact of changes in land-use intensity and climate on simulated trade-offs between crop yield and nitrogen leaching
Blanke, Jan Hendrik ; Olin, Stefan ; Stürck, Julia ; Sahlin, Ullrika ; Lindeskog, Mats ; Helming, John ; Lehsten, Veiko - \ 2017
Agriculture, Ecosystems and Environment 239 (2017). - ISSN 0167-8809 - p. 385 - 398.
Climate change - Fertilization - Land-use intensity projections - LPJ-GUESS - Nitrogen leaching - Trade-offs

In this study, a global vegetation model (LPJ-GUESS) is forced with spatial information (Nomenclature of Units for Territorial Statistics (NUTS) 2 level) of land-use intensity change in the form of nitrogen (N) fertilization derived from a model chain which informed the Common Agricultural Policy Regionalized Impact (CAPRI) model. We analysed the combined role of climate change and land-use intensity change for trade-offs between agricultural yield and N leaching in the European Union under two plausible scenarios up until 2040. Furthermore, we assessed both driver importance and uncertainty in future trends based on an alternative land-use intensity dataset derived from an integrated assessment model. LPJ-GUESS simulated an increase in wheat and maize yield but also N leaching for most regions when driven by changes in land-use intensity and climate under RCP 8.5. Under RCP 4.5, N leaching is reduced in 53% of the regions while there is a trade-off in crop productivity. The most important factors influencing yield were CO2 (wheat) and climate (maize), but N application almost equaled these in importance. For N leaching, N application was the most important factor, followed by climate. Therefore, using a constant N application dataset in the absence of future projections has a substantial effect on simulated ecosystem responses, especially for maize yield and N leaching. This study is a first assessment of future N leaching and yield responses based on projections of climate and land-use intensity. It further highlights the importance of accounting for changes in future N applications and land-use intensity in general when evaluating environmental impacts over long time periods.

De gehalten aan stikstof, fosfor en kalium in blanke vleeskalveren
Kemme, P.A. ; Diepen, J.T.M. van; Togt, P.L. van der; Jongbloed, A.W. - \ 2004
Lelystad : ID - Voeding (Rapport / Animal Sciences Group 04/0005643)
rundveehouderij - vleeskalveren - vleesproductie - stikstof - fosfor - mineralenboekhouding - chemische analyse - cattle husbandry - veal calves - meat production - nitrogen - phosphorus - nutrient accounting system - chemical analysis
Door ECLNV is gevraagd om de hoeveelheden en gehalten aan N, P en K in blanke vleeskalveren, die onder praktijkomstandigheden worden gevoerd en gehouden gedurende de opfok en op het eindgewicht vast te stellen.Voor dit doel zijn in totaal 22 blanke vleeskalveren afkomstig uit een proef van Van der Togt en Gerrits (1998) nader chemisch onderzocht. In dit rapport zijn de resultaten van deze studie weergegeven.
Themaboek Roze Vleeskalveren
Schans, F.C. van der; Plomp, M. ; Pieterse, A. ; Loseman, L. ; Scherphof, W. ; Huyben, M.W.C. ; Heeres-van der Tol, J.J. - \ 1996
Lelystad : Praktijkonderzoek Rundvee, Schapen en Paarden (Themaboek 17) - 46 p.
De roze vleeskalverhouderij staat vanaf eind 80-er jaren in de belangstelling. Aanleiding waren enerzijds de kanttekeningen die geplaatst werden bij de individuele huisvesting en de eenzijdige voeding van blanke vleeskalveren en anderzijds de hoge productiekosten. Omdat de kennis over de productie van roze kalfsvlees beperkt was, is in 1990 op het proefbedrijf van het PR, de Waiboerhoeve, een proefaccommodatie voor 320 kalveren gebouwd. In de periode 1991 t/m 1995 is het project ‘pro-ductie alternatief kalfsvlees’ uitgevoerd. Dit onderzoek is gefinancierd door het Landbouwschap, Ministerie LNV en Produktschap voor Vee en Vlees. In dit project zijn de voeding en de geschiktheid van verschillende typen kalveren uitgebreid onderzocht. De onderzoekresultaten zijn beschreven in PR-publicaties. Daarnaast was er behoefte de tot nu toe verkregen kennis in één publicatie te bundelen. Dit heeft geresulteerd in een themaboek voor de Roze vleeskalverhouderij. In dit themaboek worden de onderzoekresultaten kort weergegeven gekoppeld aan een praktisch advies. Naast het onderzoek wordt ook aandacht besteed aan o.a. huisvesting, wetgeving en diergezondheid.
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