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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    Predictive potential of wildlife value orientations for acceptability of management interventions
    Jacobs, M.H. ; Vaske, J.J. ; Sijtsma, M.T.J. - \ 2014
    Journal for Nature Conservation 22 (2014)4. - ISSN 1617-1381 - p. 377 - 383.
    conservation - netherlands - hierarchy - attitudes - issues - model
    tWildlife value orientations are patterns of basic beliefs that give direction and meaning to fundamentalvalues in the context of wildlife. Wildlife value orientations can help managers estimate public eval-uations to management interventions. Their usefulness, both practically and scientifically, depends ontheir predictive potential. This article examined the predictive value of wildlife value orientations on theacceptability of wildlife management interventions in different situations. The situations varied in (a)severity of the human wildlife problem and (b) severity of the interventions for wildlife. Two wildlifevalue orientations were measured: domination (human needs have priority over wildlife well-being, 10items) and mutualism (rights are assigned to wildlife, 9 items). Acceptability was measured as a dichoto-mous variable for management interventions across 5 different situations. The predictive value of wildlifevalue orientations was largest for acceptability of the most severe interventions (hunting, 35–42% of vari-ance explained), followed by the least severe interventions (doing nothing, 5–17%) and the intermediateinterventions (shaking eggs or applying contraceptives, 1–9%) in the scenarios that include a problemfor humans. Value priorities appear to be an integral feature of value orientations. Intermediate inter-ventions do not harm wildlife, but might solve the problem caused by wildlife. Such interventions alsocreate minimal small internal value conflicts. Orientations that prioritize values and offer a template forconflict resolution are likely to have less predictive potential for these interventions.
    Sustainable, profitable and socially responsible-building a 'triple bottom line' grouper and snapper culture industry in Komodo
    Meyer, T. ; Mous, P.J. ; Pet, J.S. - \ 2004
    Aquaculture Asia IX (2004)4. - ISSN 0859-600X - p. 34 - 36.
    Vertical distribution patterns of zooplanktivorous fish in a shallow, eutrophic lake, mediated by water transparency
    Mous, P.J. ; Densen, W.L.T. van; Machiels, M.A.M. - \ 2004
    Ecology of Freshwater Fish 13 (2004)1. - ISSN 0906-6691 - p. 61 - 69.
    juvenile sockeye-salmon - oncorhynchus-nerka - reactive distance - migration - netherlands - ijsselmeer - turbidity - growth - perch
    The vertical distribution pattern (VDP) of fish at shallow sites in eutrophic lake - Lake IJssel, the Netherlands - as affected by water transparency, was examined. The pattern was assessed by pair trawling at three depths and by hydroacoustics from June to August. Water transparency was estimated by light intensity and Secchi depth measurements. Hydroacoustics showed that fish were more dispersed at night than during the day. European smelt, (Osmerus eperlanus) and young-of-the-year Eurasian perch (Perca fluviatilis) comprised 97% of the fish in numbers. European smelt concentrated near the surface, at light intensities of >200 muW . cm(-2) when the water was turbid, and near the bottom when the water was clear (Secchi depth > 1.2 m). We concluded that low water transparency over-ruled the light sensitivity of European smelt, and caused European smelt to stay higher in the water column.
    Interactions in the utilisation of small fish by piscivorous fish and birds, and the fishery in IJsselmeer
    Mous, P.J. ; Dekker, W. ; Leeuw, J.J. de; Eerden, M.R. van; Densen, W.L.T. van - \ 2003
    In: Interactions between fish and birds: implications for management / Cowx, I.G, Oxford : Blackwell Science - ISBN 9780632063857 - p. 84 - 118.
    Interactions in the utilisation of smalll fish and birds, and the fishery in IJsselmeer.
    Mous, P.J. ; Dekker, W. ; Leeuw, J.J. de; Eerden, M.R. van; Densen, W.L.T. van - \ 2003
    In: Interactions between fish and birds: Implications for management / Cowx, I.G., Oxford : Blackwell Science - ISBN 9780632063857 - p. 84 - 118.
    The effect of smaller mesh sizes on catching larger fish with trawls
    Mous, P.M. ; Densen, W.L.T. van; Machiels, M.A.M. - \ 2002
    Fisheries Research 54 (2002). - ISSN 0165-7836 - p. 171 - 179.
    Interactions between fisheries and birds in IJsselmeer, The Netherlands
    Mous, P.J. - \ 2000
    Agricultural University. Promotor(en): E.A. Huisman; M.A.M. Machiels; A.D. Rijnsdorp. - S.l. : S.n. - ISBN 9789058081834 - 205
    visserij - vis - vogels - ijsselmeer - fisheries - fish - birds - lake ijssel

    IJsselmeer, a eutrophic, shallow lake (mean depth 4 m) of 180,000 ha, is heavily exploited by a fishery that catches dfl 11 million worth of eel Anguilla anguilla , perch Perca fluviatilis , pikeperch Stizostedion lucioperca and of the small zooplanktivorous smelt Osmerus eperlanus, the main prey for perch and pikeperch and for the piscivorous birds of IJsselmeer. The population of cormorant Phalacrocorax carbo affects the fisheries through its predation on perch and pikeperch, whereas black tern Chlidonias niger and black-headed gull Larus ridibundus are affected by the availability of smelt in IJsselmeer. The spatial distribution of prey fish and piscivorous birds was described as a function of spatial scale, water transparency and water depth. The carrying capacity of IJsselmeer for the production of prey fish was assessed, and a dynamic simulation model was constructed to predict consequences of fishery management measures on the fisheries and on the food availability for piscivorous birds.

    A towed body designed for side-scanning hydroacoustic surveying of fish stocks in shallow waters
    Mous, P.J. ; Kemper, J. ; Schelvis, A. - \ 1999
    Fisheries Research 40 (1999). - ISSN 0165-7836 - p. 97 - 98.
    An aluminum towed body was designed for use in hydroacoustic surveying of fish stocks in shallow (2–10 m depth) inland waters. The design allows applications in deep (>10 m) water bodies as well. Test results showed that the towed body was a stable platform for the hydroacoustic transducer. The towed body features adjustable beam direction, allowing a side-looking as well as a vertical-looking mode. As the design of the towed body is simple, it can be easily constructed by any skilled craftsman.
    Soil Vapour extraction versus bioventing of toluene and decane in bench-scale soil columns.
    Malina, G. ; Grotenhuis, J.T.C. ; Rulkens, W.H. ; Mous, S.L.J. ; Wit, J.C.M. de - \ 1998
    Environmental Technology 19 (1998). - ISSN 0959-3330 - p. 977 - 991.
    Modeling zero sink nutrient uptake by roots with root hairs from soil: comparison of two models.
    Geelhoed, J.S. ; Mous, S.L.J. ; Findenegg, G.R. - \ 1997
    Soil Science 162 (1997). - ISSN 0038-075X - p. 544 - 553.
    An analytical isotherm equation (CONICA) for nonideal mono- and bidentate competitive ion adsorption to heterogeneous surfaces.
    Riemsdijk, W.H. van; Wit, J.C.M. de; Mous, S.L.J. ; Koopal, L.K. ; Kinniburgh, D.G. - \ 1996
    Journal of Colloid and Interface Science 183 (1996). - ISSN 0021-9797 - p. 35 - 50.
    Development and testing of an input friendly mathematical model for optimalisation of in situ vapour extraction and biorestoration.
    Malina, G. ; Mous, S.J.L. ; Wit, H. de - \ 1996
    In: Remediation and isolation techniques for soils and sediments / Grotenhuis, J.T.C., - p. 185 - 199.
    Monitoring the fisheries.
    Mous, P.J. ; Ligtvoet, W. ; Mkumbo, O.C. - \ 1995
    In: Fish stocks and fisheries of Lake Victoria. A handbook for field observations / Witte, F., van Densen, W.L.T., Cardigan, UK : Samara Publishing Ltd - p. 187 - 208.
    Fisheries statistical service system and governmental framework.
    Budeba, Y.L. ; Mous, P.J. - \ 1995
    In: Fish stocks and fisheries of Lake Victoria. A handbook for field observations / Witte, F., van Densen, W.L.T., Cardigan, UK : Samara Publishing Ltd - p. 173 - 186.
    Data processing.
    Mous, P.J. - \ 1995
    In: Fish stocks and fisheries of Lake Victoria. A handbook for field observations / Witte, F., van Densen, W.L.T., Cardigan, UK : Samara Publishing Ltd - p. 135 - 171.
    Monitoring fish stocks from survey data.
    Ligtvoet, W. ; Mkumbo, O.C. ; Mous, P.J. ; Goudswaard, P.C. - \ 1995
    In: Fish stocks and fisheries of Lake Victoria. A handbook for field observations / Witte, F., van Densen, W.L.T., Cardigan, UK : Samara Publishing Ltd - ISBN 9781873692059 - p. 119 - 134.
    Gears and boats.
    Goudswaard, P.C. ; Mous, P.J. ; Ligtvoet, W. ; Densen, W.L.T. van - \ 1995
    In: Fish stocks and fisheries of Lake Victoria. A handbook for field observations / Witte, F., van Densen, W.L.T., Cardigan, UK : Samara Publishing Ltd - ISBN 9781873692059 - p. 83 - 115.
    Sampling and measuring.
    Mous, P.J. ; Goudswaard, P.C. ; Katunzi, E.F.B. ; Budeba, Y.L. ; Witte, F. ; Ligtvoet, W. - \ 1995
    In: Fish stocks and fisheries of Lake Victoria. A handbook for field observations / Witte, F., van Densen, W.L.T., Cardigan, UK : Samara Publishing Ltd - ISBN 9781873692059 - p. 55 - 82.
    The Lake Victoria fish stocks and fisheries.
    Ligtvoet, W. ; Mous, P.J. ; Mkumbo, O.C. ; Budeba, Y.L. ; Goudswaard, P.C. ; Katunzi, E.F.B. ; Temu, M.M. ; Wanink, J.H. ; Witte, F. - \ 1995
    In: Fish stocks and fisheries of Lake Victoria. A handbook for field observations / Witte, F., van Densen, W.L.T., Cardigan, UK : Samara Publishing Ltd - ISBN 9781873692059 - p. 11 - 53.
    An efficient solution procedure for the ONE-STEP experiment
    Mous, S. - \ 1995
    Applied mathematical modelling 19 (1995). - ISSN 0307-904X - p. 130 - 132.
    Characteristics of a Sri Lankan reservoir fishery and consequences for the estimation of annual yield.
    Pet, J.S. ; Wijsman, J.W.M. ; Mous, P.J. ; Machiels, M.A.M. - \ 1995
    Fisheries Research 24 (1995). - ISSN 0165-7836 - p. 9 - 33.
    Literatuurstudie naar de toepasbaarheid van vetzuursamenstellinganalyses voor migratieonderzoek aan zalm Salmo salar en zeeforel Salmo trutta uit het IJsselmeer.
    Mous, P. ; Luten, J.B. - \ 1995
    Unknown Publisher (RIVO Rapport CO18/95) - 20 p.
    Application of a hydroacoustic sampling technique in a large wind-exposed shallow lake.
    Mous, P.J. ; Kemper, J. - \ 1995
    In: Stock assessment in inland fisheries / Cowx, I.G., Oxford : Blackwell Scientific Publications - p. 179 - 195.
    Visserijkundige waarnemingen aan de bijvangst van zeldzame vissoorten door de beroepsvisserij op het IJsselmeer en Markermeer. TMAO-gehaltes in het vlees en realtie tot migratiepatronen van bijgevangen zalmachtigen.
    Mous, P.J. ; Luten, J.B. ; Willigen, J. van - \ 1995
    Unknown Publisher (RIVO Rapport CO37/95) - 28 p.
    Optimalisatie van in situ bioventilatie, experimentele resultaten en modelontwikkeling.
    Grotenhuis, T. ; Malina, G. ; Mous, S. ; Keizer, M. ; Wit, H. de - \ 1994
    In: Bodem Breed, M.J. Lexmond (ed.). Verslag 6e Nationaal Symp. Bodemonderzoek, Lunteren. Programmabureau Bodemonderzoek, Wageningen (1994) 124-124A
    On identification of nonlinear systems
    Mous, S.L.J. - \ 1994
    Agricultural University. Promotor(en): J. Grasman; M. de Gee. - S.l. : Mous - ISBN 9789054852254 - 129
    operationeel onderzoek - modellen - onderzoek - niet-lineair programmeren - operations research - models - research - nonlinear programming

    The development of accurate models is very important for analyzing problems concerning simulation, prediction, control, etc. Therefore it is not astonishing that many studies in applied science are about the modeling of these processes. In this thesis we will focus on the building of models that are used to describe some nonlinear processes in hydrology and meteorology; the first process is the movement of water in porous media and the second process is the large-scale atmospheric circulations.

    The process of model development can be divided in three essential subprocesses: selection of a model structure, determination of a "best fit" criterion and experimental design. In literature, their are several examples of "case-studies" known, where the specific combination of model structure, criterion and experimental design did not lead to unique estimates of the unknown parameters of the model. This situation is designated by the term: "the model is not identifiable".

    A model may not be identifiable (given a certain choice of the experimental design) because the chosen object function is insensitive to some linear combinations of the parameters. In this case the identification problem will not have a unique solution. On the other hand, due to noise in the system, the optimization problem may have many local optima. One can then easily be misled because an optimization algorithm may converge to such a local optimum. It will be studied how such a situation can be recognized. Furthermore, it will be studied how the identifiability can be improved by an appropriate choise of the experimental design.

    There are also other situations where the chosen combination of model structure, "best fit" criterion and experimental design will not lead to a unique solution. Such a case occurs when we are dealing with chaotic systems. For chaotic systems the optimization problem, using the output-error criterion as "best- fit" criterion, is ill-posed, because the model's solution depends sensitively on its initial state. The observed values and the model values will then diverge due to the limited accuracy of the initial state. Several criteria are analyzed on their capability for detecting small perturbations in the system and for estimating unknown parameters in the system.

    In chapter 2 of this thesis the ONE-STEP method is described. This method is developed to identify the parameters in a model for the movement of water in the unsaturated soils. The motivation to analyze the identifiability of this model comes from the statement made by several authors that not all model parameters can be estimated uniquely. In this chapter we will analyze first some numerical schemes to solve the mathematical model, because the efficiency and the accuracy- of a numerical scheme are very important for applicability of the ONE- STEP method.

    In chapter 3 the concept of "structural identifiability" is further developted. The term "numerical identifiable" is introduced, so that we can take into account the accuracy of the sensitivity matrix. The identifiability analysis of the ONE- STEP method shows that not all parameters can be estimated uniquely. In the best case, where the pressure in the pressure cell is increased during the experiment at certain time instants, only 5 of the 6 model parameters can be estimated uniquely. Analyzing the structure of the model, we can derive that the object function depends on 5 independent parameters only, which explains the identifiability problem. Only by adding some other measurements, for example the pressure head at a certain position in the soil core, one may, expect better results of this method.

    As already mentioned above, the output-error criterion in combination with chaotic systems, leads to ill-posed problems. In chapter 4 it is analyzed whether a criterion, based on a modified sentinel function, can be used to detect an external perturbation in a chaotic system. We found that fast varying perturbations are often "stealthy" for this function. Therefore this criterion can only be used to detect slowly varying perturbations.

    The sentinel function can also be used to estimate uncertain parameters that are used to describe such a small perturbation term. We have compared the performance of the sentinel approach with an adaptive extended Kalman filter in a test-case. In the example that is presented, the size of a perturbation in the equator-pole temperature gradient is estimated. The equator-pole temperature gradient characterizes the driving force in a low-order spectral model of the atmospheric circulation and therefore a change in the equator-pole temperature gradient may be important in studing the greenhouse effect. In this test-case the performance of the adaptive extended Kalman filter was better then the performance of the sentinel approach. The less accurate results of the sentinel method are caused by the relative slow sampling frequency. The effect of neglecting higher order terms in the Taylor expansion and the influence of observation errors is then felt.

    A disadvantage of extended Kalman filtering is that the filter easily diverges. In chapter 5 this problem is studied for chaotic systems. A reasonable approach to solve the divergence problem is to add an artificial noise term to the state equations. This noise term is used to control the accuracy of the state estimates and so preventing that the filter learns the wrong state too well. With the extended Kalman filter one can easily obtain an approximation of the value of the loglikelihood function. For this problem we have developed an optimization procedure that can be used together with the extended Kalman filter to estimate the unknown parameters in the model description as well as the parameters that are used to describe the covariance matrix of the artificial noise term. This method is successfully applied to determine the optimal extended Kalman filter for a T11-spectral model of the atmospheric circulation.

    Reconstruction of the seasonally varying contact rate for measles.
    Kalivianakis, M. ; Mous, S. ; Grasman, J. - \ 1994
    Mathematical Biosciences 124 (1994). - ISSN 0025-5564 - p. 225 - 234.
    Distribution patterns of 0+ perch (Perca fluviatilis) and smelt (Osmerus eperlanus) in a large shallow lake in relation to hydroacoustic sampling strategy.
    Mous, P.J. - \ 1993
    Journal of Fish Biology 43 (1993). - ISSN 0022-1112 - p. 332 - 333.
    A catch effort data recording system for the developing fishery on the small pelagic Rastrineobola argentea in the southern part of Lake Victoria.
    Mous, P.J. ; Budeba, Y.L. ; Temu, M.M. ; Densen, W.L.T. van - \ 1991
    In: Catch-effort sampling and their application in freshwater fisheries management / Cowx, I.G., Blackwell - p. 335 - 349.
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