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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    Changing weather conditions and floating plants in temperate drainage ditches
    Peeters, E.T.H.M. ; Zuidam, B.G. van; Zuidam, J.P. van; Nes, E.H. van; Kosten, S. ; Heuts, P.G.M. ; Roijackers, R.M.M. ; Netten, J.J.C. ; Scheffer, M. - \ 2013
    Journal of Applied Ecology 50 (2013)3. - ISSN 0021-8901 - p. 585 - 593.
    climate-change - submerged macrophytes - aquatic macrophytes - species richness - shallow lakes - lemna-minor - eutrophication - growth - phytoplankton - phenology
    Dominance of free-floating plants such as duckweed is undesirable as it indicates eutrophication. The objectives of this study are to investigate whether the onset of duckweed dominance is related to weather conditions by analysing field observations, to evaluate the effect of different climate scenarios on the timing of duckweed dominance using a model and to evaluate to what extent nutrient levels should be lowered to counteract effects of global warming. To analyse the onset of duckweed dominance in relation to weather conditions, duckweed cover in Dutch ditches was correlated with weather conditions for the period 1980-2005. Furthermore, a model was developed that describes biomass development over time as a function of temperature, light and nutrient availability, crowding and mortality. This model was used to evaluate the effects of climate change scenarios and the effects of lowering nutrients. The onset of duckweed dominance in the field advanced by approximately 14 days with an increase of 1 °C in the average maximum daily winter temperature. The modelled biomass development correlated well with the field observations. Scenarios showed that expected climate change will affect onset and duration of duckweed dominance in temperate ditches. Reducing nutrient levels may counteract the effect of warming. Synthesis and applications. Global warming may lead to an increase in the dominance of free-floating plants in drainage ditches in the Netherlands. The expected reductions in nutrient-loading to surface waters as a result of different measures taken so far are likely not sufficient to counteract these effects of warming. Therefore, additional measures should be taken to avoid a further deterioration of the ecological water quality in ditches. © 2013 The Authors. Journal of Applied Ecology © 2013 British Ecological Society.
    Ontwerp van een vispasseerbare kantelstuw: de V-stuw
    Hoitink, A.J.F. ; Dommerholt, A. ; Heuts, P.G.M. ; Ottburg, F.G.W.A. - \ 2007
    Utrecht : Stowa (STOWA rapport 2007 04) - ISBN 9789057733505 - 35
    waterbeheer - stuwen - vissen - vismigratie - hydraulische systemen - ontwerp - waterstand - water management - weirs - fishes - fish migration - hydraulic structures - design - water level
    Waterschappen streven ernaar om het peilbeheer zo optimaal mogelijk te maken. In plaats van overtollig regenwater af te voeren in tijden van te veel water en water in te laten ten tijde van water tekort, streeft men naar het bergen en vasthouden van gebiedseigen en regenwater. Uit ecologisch oogpunt is het gewenst om de inlaat van ‘gebiedsvreemd water’ zo veel mogelijk te voorkomen. Veelal worden stuwen als kunstwerk geplaatst om water ‘vast te kunnen houden’ om de toevoer van water te beperken. Stuwen hebben als nadeel dat deze niet passeerbaar zijn voor vissen met als gevolg dat achterliggende gebieden niet bereikbaar zijn. Om dit te voorkomen is een nieuw soort kunstwerk ontwikkeld, de zogenaamde vispasseerbare kantelstuw, ook wel V-stuw genaamd. Deze stuw bestond alleen nog maar als concept. Het rapport legt verslag van een studie resulterend in een principe ontwerp van een vispasseerbare stuw
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