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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Identification of Loci Associated with Enhanced Virulence in Spodoptera litura Nucleopolyhedrovirus Isolates Using Deep Sequencing
Zwart, Mark P. ; Ali, Ghulam ; Strien, Elisabeth A. van; Schijlen, Elio G.W.M. ; Wang, Manli ; Werf, Wopke van der; Vlak, Just M. - \ 2019
Viruses 11 (2019)9. - ISSN 1999-4915
deep sequencing - genomics - Illumina - SpltNPV - Spodoptera litura nucleopolyhedrovirus - virulence

Spodoptera litura is an emerging pest insect in cotton and arable crops in Central Asia. To explore the possibility of using baculoviruses as biological control agents instead of chemical pesticides, in a previous study we characterized a number of S. litura nucleopolyhedrovirus (SpltNPV) isolates from Pakistan. We found significant differences in speed of kill, an important property of a biological control agent. Here we set out to understand the genetic basis of these differences in speed of kill, by comparing the genome of the fast-killing SpltNPV-Pak-TAX1 isolate with that of the slow-killing SpltNPV-Pak-BNG isolate. These two isolates and the SpltNPV-G2 reference strain from China were deep sequenced with Illumina. As expected, the two Pakistani isolates were closely related with >99% sequence identity, whereas the Chinese isolate was more distantly related. We identified two loci that may be associated with the fast action of the SpltNPV-Pak-TAX1 isolate. First, an analysis of rates of synonymous and non-synonymous mutations identified neutral to positive selection on open reading frame (ORF) 122, encoding a viral fibroblast growth factor (vFGF) that is known to affect virulence in other baculoviruses. Second, the homologous repeat region hr17, a putative enhancer of transcription and origin of replication, is absent in SpltNPV-Pak-TAX1 suggesting it may also affect virulence. Additionally, we found there is little genetic variation within both Pakistani isolates, and we identified four genes under positive selection in both isolates that may have played a role in adaptation of SpltNPV to conditions in Central Asia. Our results contribute to the understanding of the enhanced activity of SpltNPV-Pak-TAX1, and may help to select better SpltNPV isolates for the control of S. litura in Pakistan and elsewhere.

Is comfort food actually comforting for emotional eaters? A (moderated) mediation analysis
Strien, Tatjana van; Gibson, E.L. ; Baños, Rosa ; Cebolla, Ausiàs ; Winkens, Laura H.H. - \ 2019
Physiology and Behavior 211 (2019). - ISSN 0031-9384
Eating satisfaction - Food, mood, emotional eating - Tastiness

An important but unreplicated earlier finding on comfort eating was that the association between food intake and immediate mood improvement appeared to be mediated by the palatability of the food, and that this effect was more pronounced for high than for low emotional eaters [26]. This has not yet been formally tested using mediation and moderated mediation analysis. We conducted these analyses using data from two experiments on non-obese female students (n = 29 and n = 74). Mood and eating satisfaction in Study 1, and mood, tastiness and emotional eating in Study 2 were all self-reported. In Study 1, using a sad mood induction procedure, emotional eaters ate more food, and when mood was assessed immediately after food intake, ‘eating satisfaction’ acted as mediator between food intake and mood improvement (decrease in sadness or increase in happiness). In Study 2, where we measured the difference in actual food intake after a control or a stress task (modified Trier Social Stress Test), and assessed mood during the food intake after stress, we found significant moderated mediation. As expected, there was a significant positive mediation effect of tastiness between food intake and mood improvement in the high emotional eaters, but also a significant negative mediation effect of tastiness between food intake and mood improvement in the low emotional eaters. This suggests that tastiness promotes ‘comfort’ from food in female emotional eaters, but conflicts in non-emotional eaters with a tendency to eat less when stressed. In conclusion, palatable food may indeed provide comfort specifically for high emotional eaters during eating.

Parenting quality in infancy and emotional eating in adolescence : Mediation through emotion suppression and alexithymia
Strien, Tatjana van; Beijers, Roseriet ; Smeekens, Sanny ; Winkens, Laura H.H. ; Konttinen, Hanna - \ 2019
Appetite 141 (2019). - ISSN 0195-6663
Alexithymia - Emotion regulation - Emotional eating - Longitudinal - Quality of parenting

This study assessed the association between parenting quality at age 15 and 28 months and emotional eating (EE) at age 12 and 16 years through serial mediation by suppression of emotions and alexithymia at 12 years. The sample included 129 children and their parents. Lower parental quality in infancy was related to more suppression of emotions, which in turn was related to more difficulty identifying emotions, and in turn to higher EE in adolescence. This serial mediation model was significant for EE at 12 years, and for EE at 16 years. If future studies reveal converging findings, this knowledge points to the need for programs preventing the development of EE in adolescence through increasing the quality of parenting in infancy.

Distribution trends of European dragonflies under climate change
Termaat, Tim ; Strien, Arco J. van; Grunsven, Roy H.A. van; Knijf, Geert De; Bjelke, Ulf ; Burbach, Klaus ; Conze, Klaus Jürgen ; Goffart, Philippe ; Hepper, David ; Kalkman, Vincent J. ; Motte, Grégory ; Prins, Marijn D. ; Prunier, Florent ; Sparrow, David ; Top, Gregory G. van den; Vanappelghem, Cédric ; Winterholler, Michael ; Wallis De Vries, Michiel F. - \ 2019
Diversity and Distributions 25 (2019)6. - ISSN 1366-9516 - p. 936 - 950.
citizen science data - climate change - Community Temperature Index - Multi-species Indicator - Odonata - Species Temperature Index

Aim: Poleward range shifts of species are among the most obvious effects of climate change on biodiversity. As a consequence of these range shifts, species communities are predicted to become increasingly composed of warm-dwelling species, but this has only been studied for a limited number of taxa, mainly birds, butterflies and plants. As species groups may vary considerably in their adaptation to climate change, it is desirable to expand these studies to other groups, from different ecosystems. Freshwater macroinvertebrates, such as dragonflies (Odonata), have been ranked among the species groups with highest priority. In this paper, we investigate how the occurrence of dragonflies in Europe has changed in recent decades, and if these changes are in parallel with climate change. Location: Europe. Methods: We use data from 10 European geographical regions to calculate occupancy indices and trends for 99 (69%) of the European species. Next, we combine these regional indices to calculate European indices. To determine if changes in regional dragonfly communities in Europe reflect climatic warming, we calculate Species Temperature Indices (STI), Multi-species Indicators (MSI) and Community Temperature Indices (CTI). Results: 55 of 99 considered species increased in occupancy at European level, 32 species remained stable, and none declined. Trends for 12 species are uncertain. MSI of cold-dwelling and warm-dwelling species differ in some of the regions, but increased at a similar rate at European level. CTI increased in all regions, except Cyprus. The European CTI increased slightly. Main conclusions: European dragonflies, in general, have expanded their distribution in response to climate change, even though their CTI lags behind the increase in temperature. Furthermore, dragonflies proved to be a suitable species group for monitoring changes in communities, both at regional and continental level.

Over a century of data reveal more than 80% decline in butterflies in the Netherlands
Strien, Arco J. van; Swaay, Chris A.M. van; Strien-van Liempt, Willy T.F.H. van; Poot, Martin J.M. ; WallisDeVries, Michiel F. - \ 2019
Biological Conservation 234 (2019). - ISSN 0006-3207 - p. 116 - 122.
Bayesian inference - Distribution - JAGS - List length analysis - Living Planet Index - Monitoring

Opportunistic butterfly records from 1890 to 2017 were analysed to quantitatively estimate the overall long-term change in occurrence of butterfly species in the Netherlands. For 71 species, we assessed trends in the number of occupied 5 km × 5 km sites by applying a modified List Length method, which takes into account changes in observation effort. We summarised the species trends in a Multi-Species Indicator (MSI) by taking the geometric mean of the species indices. Between 1890–1930 and 1981–1990, the MSI decreased by 67%; downward trends were detected for 42 species, many of which have disappeared completely from the Netherlands. Monitoring count data available from 1992 showed a further 50% decline in MSI. Combined, this yields an estimated decline of 84% in 1890–2017. We argue that in reality the loss is likely even higher. We also assessed separate MSIs for three major butterfly habitat types in the Netherlands: grassland, woodland and heathland. Butterflies strongly declined in all three habitats alike. The trend has stabilised over recent decades in grassland and woodland, but the decline continues in heathland.

Planten reageren onverwacht op extra kooldioxide
Struik, Paul - \ 2018

Planten groeien beter als de hoeveelheid koolstofdioxide in de atmosfeer stijgt, zo is de gedachte. Maar op lange termijn reageert het merendeel van de planten niet op extra CO2, blijkt nu uit onderzoek aan de universiteit van Minnesota.

Planten groeien beter als de hoeveelheid koolstofdioxide in de atmosfeer stijgt, zo is de gedachte. Maar op lange termijn reageert het merendeel van de planten niet op extra CO2, blijkt nu uit onderzoek aan de universiteit van Minnesota.

Woodland ectomycorrhizal fungi benefit from large-scale reduction in nitrogen deposition in the Netherlands
Strien, Arco J. van; Boomsluiter, Menno ; Noordeloos, Machiel E. ; Verweij, Richard J.T. ; Kuijper, Thomas - \ 2018
Journal of Applied Ecology 55 (2018)1. - ISSN 0021-8901 - p. 290 - 298.
Citizen science - Ectomycorrhiza - Environmental measures - Legacy - Mycoflora - Nitrogen deposition - Saprotrophs - Wood parasites

Woodland ectomycorrhizal (ECM) fungal species declined considerably in the Netherlands in the late 20th century, mainly due to raised levels of atmospheric nitrogen deposition. Environmental measures have been taken to reduce this deposition, but it remains unclear whether and to what extent ECM species have benefitted from these. We hypothesized that ECM species, especially those species that are known to be nitrophobic, that is, sensitive to nitrogen loading, have recovered to some extent from the reduction in nitrogen deposition after 1994. We further hypothesized that, due to legacy effects of deposition, recovery has been stronger in regions where deposition levels have previously been lower. To test these hypotheses, we analysed long-term opportunistic data, that is, observations collected without standardized field method. We applied data filtering and a modified List Length method to adjust for potential biases in these data. The removal of bias left us with two periods to examine ECM species trends: before (1965-1985) and after (1994-2013) deposition reduction started [in 1994]. We compared trends in ECM species in 1965-1985 with those in 1994-2013. Multispecies indicators were used to summarize the findings of ECM species, and to compare these with results of litter saprotrophic species and wood saprotrophic and wood parasitic species. We found that (1) most trends switched in direction from negative to positive after the reduction in nitrogen deposition began; (2) these trends were more pronounced for nitrophobic ECM species than for nitrotolerant ECM species; (3) trends for ECM species differed from those of the other functional groups; and (4) recovery was stronger in the region with a history of lower deposition. Policy implications. Our results suggest that woodland ectomycorrhizal species benefit substantially from environmental measures to reduce nitrogen deposition. Our study is one of few scientific studies to date documenting evidence of success of large-scale (nation-wide) environmental measures. We have demonstrated that opportunistic citizen science data can be used for the detection of species trends, but it is essential to examine and control for potential bias in the data.

Data from: Woodland ectomycorrhizal fungi benefit from large-scale reduction of nitrogen deposition in the Netherlands
Strien, Arco J. van; Boomsluiter, Menno ; Noordeloos, Machiel E. ; Verweij, Richard J.T. ; Kuijper, T.W.M. - \ 2017
nitrogen reduction - mycoflora - citizen science - ectomycorrhiza - environmental measures - saprotrophs - wood parasites - legacy
1.Woodland ectomycorrhizal (ECM) fungal species declined considerably in the Netherlands in the late 20th century, mainly due to raised levels of atmospheric nitrogen deposition. Environmental measures have been taken to reduce this deposition, but it remains unclear whether and to what extent ECM species have benefitted from this. 2.We hypothesised that ECM species, especially those species that are known to be nitrophobic, i.e. sensitive to nitrogen loading, have recovered to some extent from the reduction in nitrogen deposition after 1994. We further hypothesised that, due to legacy effects of deposition, recovery has been stronger in regions where deposition levels have previously been lower. 3.To test these hypotheses, we analysed long-term opportunistic data, i.e., observations collected without standardised field method. We applied data filtering and a modified List Length method to adjust for potential biases in these data. The removal of bias left us with two periods to examine ECM species trends: before (1965-1985) and after (1994-2013) deposition reduction started [in 1994]. 4.We compared trends in ECM species in 1965-1985 with those in 1994-2013. Multispecies indicators were used to summarise the findings of ECM species, and to compare these with results of litter saprotrophic species and wood saprotrophic and wood parasitic species. 5.We found that (i) most trends switched in direction from negative to positive after the reduction of nitrogen deposition began, (ii) these trends were more pronounced for nitrophobic ECM species than for nitrotolerant ECM species; (iii) trends for ECM species differed from those of the other functional groups; and (iv) recovery was stronger in the region with a history of lower deposition. 6.Policy implications. Our results suggest that woodland ectomycorrhizal species benefit substantially from environmental measures to reduce nitrogen deposition. Our study is one of few scientific studies to date documenting evidence of success of large-scale (nation-wide) environmental measures. We have demonstrated that opportunistic citizen-science data can be used for the detection of species trends, but it is essential to examine and control for potential bias in the data.
Strong recovery of dragonflies in recent decades in The Netherlands
Termaat, T. ; Grunsven, R.H.A. van; Plate, C.L. ; Strien, A. van - \ 2015
Freshwater Science 34 (2015)3. - ISSN 2161-9549 - p. 1094 - 1104.
change odonata corduliidae - boreal forest lakes - climate-change - trends - conservation - assemblages - indicators - integrity - abundance - plants
Many dragonfly species in The Netherlands declined in the 20th century because of acidification, eutrophication, and desiccation of lotic and lentic habitats and canalization of streams and rivers. These pressures peaked in the 1970s, when 26 of 65 native species had an unfavorable conservation status on the 1997 Dutch Red List. Since the 1980s, environmental regulations have led to improved water quality, and any habitat restoration projects have been carried out. We used standardized monitoring data (1999–2013) and unstandardized observations (1991–2013) to investigate how dragonflies have changed in the last 20 y on a national scale. We compared trends of dragonfly species from different habitat types and with southern vs northern distribution in Europe. Dragonflies recovered strongly in The Netherlands in a period of ~20 y, probably because of recent habitat improvements. Lotic species have benefitted more than lentic species, and southern species have more positive trends than northern species, suggesting that climate change has contributed to the recovery. Dragonflies were resilient and able to quickly recover when their habitats were restored. Recovery has led to a better conservation status for many species. Unstandardized data delivered results consistent with those from monitoring data and had greater statistical power to detect trends because many more unstandardized data than standardized data were available. Thus, when the goal is to provide a general overview of changes in dragonflies, unstandardized data can outperform standardized abundance data. However, abundance data may deliver complementary information for individual species. Our results support the suitability of dragonflies as indicators of freshwater habitat condition, but they recover more strongly in The Netherlands than many other insects, possibly because of their higher dispersal abilities or different habitat requirements.
No evidence of the effect of extreme weather events on annual occurrence of four groups of ectothermic species
Malinowska, A.H. ; Strien, A.J. van; Verboom, J. ; Wallis de Vries, M.F. ; Opdam, P. - \ 2014
PLoS ONE 9 (2014)10. - ISSN 1932-6203 - 10 p.
climate-change - metapopulation dynamics - habitat fragmentation - population-dynamics - occupancy models - european climate - range expansion - dispersal - trends - impact
Weather extremes may have strong effects on biodiversity, as known from theoretical and modelling studies. Predicted negative effects of increased weather variation are found only for a few species, mostly plants and birds in empirical studies. Therefore, we investigated correlations between weather variability and patterns in occupancy, local colonisations and local extinctions (metapopulation metrics) across four groups of ectotherms: Odonata, Orthoptera, Lepidoptera, and Reptilia. We analysed data of 134 species on a 1×1 km-grid base, collected in the last 20 years from the Netherlands, combining standardised data and opportunistic data. We applied dynamic site-occupancy models and used the results as input for analyses of (i) trends in distribution patterns, (ii) the effect of temperature on colonisation and persistence probability, and (iii) the effect of years with extreme weather on all the three metapopulation metrics. All groups, except butterflies, showed more positive than negative trends in metapopulation metrics. We did not find evidence that the probability of colonisation or persistence increases with temperature nor that extreme weather events are reflected in higher extinction risks. We could not prove that weather extremes have visible and consistent negative effects on ectothermic species in temperate northern hemisphere. These findings do not confirm the general prediction that increased weather variability imperils biodiversity. We conclude that weather extremes might not be ecologically relevant for the majority of species. Populations might be buffered against weather variation (e.g. by habitat heterogeneity), or other factors might be masking the effects (e.g. availability and quality of habitat). Consequently, we postulate that weather extremes have less, or different, impact in real world metapopulations than theory and models suggest.
Optimalisatie bemesting Van Strien : voortgang 2013
Hospers-Brands, A.J.T.M. ; Strien, J. van - \ 2014
Driebergen : Louis Bolk Instituut (Rapport / Louis Bolk Instituut 2014-012 LbP) - 19 p.
bemesting - akkerbouw - veldproeven - vollegrondsgroenten - landbouwkundig onderzoek - stikstof - proefopzet - biologische landbouw - fertilizer application - arable farming - field tests - field vegetables - agricultural research - nitrogen - experimental design - organic farming
Dit rapport bevat de resultaten van het derde jaar van het project “Bedrijfsinterne Optimalisatie”, en wel van het deelproject “Van Strien”. Op diverse percelen zijn metingen uitgevoerd aan de bodem om de stikstof werking van maaimeststoffen in beeld te krijgen.
Emotional, external and restrained eating behaviour and BMI trajectories in adolescence
Snoek, Harriëtte M. ; Engels, Rutger C.M.E. ; Strien, Tatjana Van; Otten, Roy - \ 2013
Appetite 67 (2013). - ISSN 0195-6663 - p. 81 - 87.
Individual differences in eating behaviours might partly explain the variations in development of weight gain and subsequent overweight and obesity. In the current study, identified trajectories of BMI in adolescence and their associations with restrained, emotional and external eating were tested. For the assessment of BMI trajectories growth mixture modelling was used; a method used to identify clusters of individuals within a population that follow distinct developmental trajectories. In total 328 Dutch adolescents (13–15 years old at baseline) self-reported their height and weight at five annual waves and their eating behaviour at baseline. Development of BMI was best fitted in five distinct trajectories that showed similar moderate increase of BMI over time; parallel but at a different level. High restrained eaters had a higher chance of being in the higher BMI trajectories. Emotional and external eating were unrelated to the BMI trajectories. In conclusion, adolescents in this study followed very parallel patterns of moderate increases in BMI which suggests that factors acting on individual differences in weight status have had their influence mostly at a – perhaps much – younger age. Restraint eating was related to BMI in early adolescence, but not to an increases or decreases in BMI over the course of adolescence.
Recent changes in distribution of ectotherms cannot be explained by extreme weather events
Malinowska, A.H. ; Strien, A.J. van; Wallisde Vries, M.F. ; Opdam, P. - \ 2013
Optimalisatie bemesting Van Strien : voortgang 2012
Hospers-Brands, A.J.T.M. ; Burgt, G.J.H.M. van der; Strien, J. van - \ 2013
[Driebergen] : Louis Bolk Instituut (Publicatie / Louis Bolk Instituut nr.: 2013-013 LbP) - 27 p.
bemesting - akkerbouw - veldproeven - proefopzet - vollegrondsgroenten - landbouwkundig onderzoek - stikstof - biologische landbouw - fertilizer application - arable farming - field tests - experimental design - field vegetables - agricultural research - nitrogen - organic farming
Dit rapport bevat de resultaten van het tweede jaar van het project “Bedrijfsinterne Optimalisatie”, en wel van het deelproject “Van Strien”. Op diverse percelen zijn metingen uitgevoerd aan de bodem om de stikstof werking van maaimeststoffen in beeld te krijgen. Soms betreft het een vergelijking met de toediening van dierlijke mest, soms gaat het om verschillende hoeveelheden van toegediende maaimeststoffen. Er zijn geen verrassende resultaten, met uitzondering van een perceel tarwe waarbij een gift maaimeststof zonder (wel geplande) dierlijke mest geen meeropbrengst gaf ten opzichte van helemaal geen bemesting.
Beperkt herstel konijnenstand na virusziekten : duinbeheerders met ziekteverlof
Strien, A.J. van; Meij, T. van der; Dekker, J.J.A. - \ 2012
Vakblad Natuur Bos Landschap 9 (2012)9. - ISSN 1572-7610 - p. 14 - 17.
konijnen - fauna - ecologisch herstel - virusziekten - duingebieden - zuid-holland - noord-holland - rabbits - ecological restoration - viral diseases - duneland
De laatste jaren zie je het weer: afgegraasd duingrasland met veel konijnenkeutels. De terreinbeheerders zijn blij met de terugkeer van het konijn, want deze dieren zijn belangrijke hulpkrachten bij het duinbeheer. Door ziekten waren er niet veel meer van over. Het herstel is nog wankel en de mogelijkheden van terreinbeheerders om wat aan de lage stand te doen, zijn vrij beperkt.
Correspondence: Uncertainty in thermal tolerances and climatic debt
Devictor, V. ; Swaay, C. van; Brereton, T. ; Brotons, L. ; Chamberlain, D. ; Heliölä, J. ; Herrando, S. ; Julliard, R. ; Kuussaari, M. ; Lindström, A. ; Reif, J. ; Roy, D.B. ; Schweiger, O. ; Settele, J. ; Stefanescu, C. ; Strien, A. van; Turnhout, C. van; Vermouzek, Z. ; Wallis de Vries, M.F. ; Wynhoff, I. ; Jiguet, F. - \ 2012
Nature Climate Change 2 (2012). - ISSN 1758-678X - p. 638 - 639.
Differences in the climatic debts of birds and butterflies at a continental scale
Devictor, V. ; Swaay, C. van; Brereton, T. ; Brotons, L. ; Chamberlain, D. ; Heliölä, J. ; Herrando, S. ; Julliard, R. ; Kuussaari, M. ; Lindström, A. ; Reif, J. ; Roy, D.B. ; Schweiger, O. ; Settele, J. ; Stefanescu, C. ; Strien, A. van; Turnhout, C. van; Vermouzek, Z. ; Wallis de Vries, M.F. ; Wynhoff, I. ; Jiguet, F. - \ 2012
Nature Climate Change 2 (2012). - ISSN 1758-678X - p. 121 - 124.
evolutionary responses - global change - extinction - adaptation
Climate changes have profound effects on the distribution of numerous plant and animal species(1-3). However, whether and how different taxonomic groups are able to track climate changes at large spatial scales is still unclear. Here, we measure and compare the climatic debt accumulated by bird and butterfly communities at a European scale over two decades (1990-2008). We quantified the yearly change in community composition in response to climate change for 9,490 bird and 2,130 butterfly communities distributed across Europe(4). We show that changes in community composition are rapid but different between birds and butterflies and equivalent to a 37 and 114 km northward shift in bird and butterfly communities, respectively. We further found that, during the same period, the northward shift in temperature in Europe was even faster, so that the climatic debts of birds and butterflies correspond to a 212 and 135 km lag behind climate. Our results indicate both that birds and butterflies do not keep up with temperature increase and the accumulation of different climatic debts for these groups at national and continental scales.
Toepassing van maaimeststoffen - Van Strien, 2011
Burgt, G.J.H.M. van der; Rietberg, P. - \ 2012
Driebergen : Louis Bolk Instituut (Publikatie / Louis Bolk Instituut 2012-027) - 36 p.
biologische landbouw - groenbemesters - organische meststoffen - grasmaaisel - akkerbouw - bemesting - organic farming - green manures - organic fertilizers - grass clippings - arable farming - fertilizer application
Dit is het eerste tussentijdse verslag van onderzoek naar de optimalisatie van bedrijfsinterne mineralenstromen. Het onderzoek vond plaats op het bedrijf van Joost van Strien. Gezien het feit dat dit het eerste jaar is van een meerjarig onderzoek gaat het vooral om het vastleggen en beschikbaar hebben van gegevens.
Ecological strategies successfully predict the effects of river floodplain rehabilitation on breeding birds
Turnhout, C.A.M. van; Leuven, R.S.E.W. ; Hendriks, A.J. ; Kurstjens, G. ; Strien, A. van; Foppen, R.P.B. ; Siepel, H. - \ 2012
River Research and Applications 28 (2012)3. - ISSN 1535-1459 - p. 269 - 282.
theoretical habitat templets - life-history tactics - upper rhone river - species richness - lowland rivers - present state - rhine - europe - biodiversity - restoration
To improve the ecological functioning of riverine ecosystems, large-scale floodplain rehabilitation has been carried out in the Rhine–Meuse Delta since the 1990s. This paper evaluates changes in abundance of 93 breeding bird species over a period of 10 years in response to rehabilitation, by comparing population changes in 75 rehabilitated sites with 124 non-rehabilitated reference sites. Such quantitative, multi-species, large-scale and long-term evaluations of floodplain rehabilitation on biodiversity are still scarce, particularly studies that focus on the terrestrial component. We try to understand the effects by relating population trends to ecological and life-history traits and strategies of breeding birds. More specifically, we try to answer the question whether rehabilitation of vegetation succession or hydro-geomorphological river processes is the key driver behind recent population changes in rehabilitated sites. Populations of 35 species have significantly performed better in rehabilitated sites compared to non-rehabilitated floodplains, whereas only 8 have responded negatively to rehabilitation. Differences in effects between species are best explained by the trait selection of nest location. Reproductive investment and migratory behaviour were less strong predictors. Based on these three traits we defined eight life-history strategies that successfully captured a substantial amount of variation in rehabilitation effects. We conclude that spontaneous vegetation succession and initial excavations are currently more important drivers of population changes than rehabilitation of hydrodynamics. The latter are strongly constrained by river regulation. If rehabilitation of hydro-geomorphological processes remains incomplete in future, artificial cyclic floodplain rejuvenation will be necessary for sustainable conservation of characteristic river birds
Occupancy dynamics of wild rabits (Oryctolagus cuniculus) in the coastal dunes of the Nederlands with imperfect detection
Strien, A.J. van; Dekker, J.J.A. ; Straver, M. ; Meij, T. van der; Soldaat, L.L. ; Ehrenburg, A. ; Loon, E. van - \ 2011
Wildlife Research 38 (2011)8. - ISSN 1035-3712 - p. 717 - 725.
hemorrhagic-disease - spotlight counts - european rabbits - population-size - conservation - abundance - models
Context: Wild rabbits are considered a key species in the coastal dunes of the Netherlands, but populations have collapsed as a result of viral diseases. Aim: We studied to what extent population collapse led to local extinction and whether recolonisation of empty patches in the dunes happened. Methods: We investigated occupancy dynamics using data of 245 transects where rabbits were surveyed in 1984–2009. Dynamic site-occupancy models were used to analyse the data. These models adjust for imperfect detection to avoid bias in occupancy-trend estimation. Key results: The decline of the rabbit population has resulted in many local extinctions, especially in woodland and in the northern part of the coastal dunes. Most transects along grassland and mixed vegetation have recently been reoccupied. The recovery of woodland occupancy is slow, probably not because of limited dispersal capacity of rabbits, but because the quality of woodland habitats is poor. Detection probability of rabbits varied considerably over the years and among habitat types, indicating the necessity of taking detection into account. Rabbits were slightly better detected when it was cloudy, windy and rainy and when lunar phase approached new moon. Conclusion: Extinction and recolonisation of habitat patches varied considerably among habitat types. Implications: The current slow recolonisation hampers the recovery of rabbit populations in woodland habitats in the Dutch coastal dunes. Furthermore, monitoring rabbit occupancy should take imperfect detection into account to avoid biased results.
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