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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Climate change adaptation and the role of fuel subsidies: An empirical bio-economic modeling study for an artisanal open-access fishery
Lancker, Kira ; Deppenmeier, Anna Lena ; Demissie, Teferi ; Schmidt, Jörn O. - \ 2019
PLoS ONE 14 (2019)8. - ISSN 1932-6203

Climate change can severely impact artisanal fisheries and affect the role they play in food security. We study climate change effects on the triple bottom line of ecological productivity, fishers’ incomes, and fish consumption for an artisanal open-access fishery. We develop and apply an empirical, stochastic bio-economic model for the Senegalese artisanal purse seine fishery on small pelagic fish and compare the simulated fishery’s development using four climate projections and two policy scenarios. We find that economic processes of adaptation may amplify the effects of climate variations. The regions’ catch potential increases with climate change, induced by stock distribution changes. However, this outcome escalates over-fishing, whose effects outpace the incipiently favorable climate change effects under three of the four climate projections. Without policy action, the fishery is estimated to collapse in 2030–2035 on average over 1000 runs. We propose an easily implementable and overall welfare-increasing intervention: reduction of fuel subsidies. If fuel subsidies were abolished, ecological sustainability as well as the fishery’s welfare contribution would increase regardless of the climate projection.

KBWOT 2012: the use of an acoustic technique in mapping beds of razor clams (Ensis sp.)
Troost, K. ; Asch, M. van; Baeye, M. ; Brummelhuis, E.B.M. ; Davaasuren, N. ; Ende, D. van den; Lancker, V. van - \ 2013
Yerseke : Centrum voor Visserijonderzoek (CVO report / Centre for Fisheries Research (CVO) 13.001) - 23
ensis - schaaldieren - onderwaterakoestiek - visstand - monitoring - nederlandse wateren - kustwateren - nederland - shellfish - underwater acoustics - fish stocks - dutch waters - coastal water - netherlands
For the survey of shellfish in the Dutch coastal zone (WOT Ensis), a fixed stratified sampling grid is used. Stratification is based on expectation of occurrence, for which previously observations by Spisula fishermen were used. Spisula subtruncata has largely disappeared and was replaced by Ensis sp. However, the stratified sampling grid is still mainly based on expected occurrence of Spisula. The quality of the data would be improved with an entirely independent basis for the stratification. An improved accuracy of stratified sampling grids will increase the efficiency of the WOT surveys and will also increase the confidence level of stock assessments. This will benefit management of shellfish stocks and fishery and will also enhance the reliability of environmental impact assessment studies. Acoustic techniques are increasingly applied for seafloor mapping and optimum allocation techniques for stock assessments. In the framework of the Belgian Science Policy project EnSIS multibeam technology was successfully used to find an acoustic signal representative of dense Ensis sp. aggregations in Belgian waters. In this study however, only relatively few sampling stations were present in the areas with the acoustic signal; a plea was held for more ground-truthing enabling applications in regular monitoring of Ensis sp. or other benthic species that form dense aggregations. Within the KBWOT Fisheries programme of 2012 we further studied the possibility to apply multibeam technology in the annual WOT stock assessment of Ensis sp. in cooperation with the Royal Belgian Institute of Natural Sciences – Management Unit North Sea Mathematical Models (RBINS-MUMM), that also performed the EnSIS project in cooperation with other institutes such as IMARES. The aim of this project was fourfold: 1. study the ability to discern different types of seafloor (e.g. mud, sand, gravel, shellfish beds infaunal and epifaunal) using a high frequency multibeam acoustic sounding system; 2. assess the applicability of multibeam for stratified sampling in the coastal zone: will it optimize the sampling strategy and enhance efficiency? 3. determine what is needed to develop this innovative technique within IMARES and to apply it for stock assessments of shellfish and possibly other benthic communities (expertise, software, etc); 4. determine with whom to cooperate in future regarding availability of multibeam equipment and analysis techniques.
EnSIS - Ecosystem Sensivity to Invasive Species
Houziaux, J.S. ; Craeymeersch, J.A.M. ; Merckx, B. ; Kerckhof, F. ; Lancker, V. van; Courtens, W. ; Stienen, E.W.M. ; Rabaut, M. ; Perdon, K.J. ; Goudswaard, P.C. ; Hoey, G. van; Vigin, L. ; Hostens, K. ; Vincx, M. ; Degraer, S. - \ 2011
Brussels : Belgian Science Policy - 100 p.
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