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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Simulating long-term effects of bioenergy extraction on dead wood availability at a landscape scale in Sweden
Hof, Anouschka R. ; Löfroth, Therese ; Rudolphi, Jörgen ; Work, Timothy ; Hjältén, Joakim - \ 2018
Forests 9 (2018)8. - ISSN 1999-4907
Biodiversity - Biofuel - Boreal forest - Modelling - Saproxylic species

Wood bioenergy may decrease the reliance on fossil carbon and mitigate anticipated increases in temperature. However, increased use of wood bioenergy may have large impacts on forest biodiversity primarily through the loss of dead wood habitats. We evaluated both the large-scale and long-term effects of different bioenergy extraction scenarios on the availability of dead wood and the suitability of the resulting habitat for saproxylic species, using a spatially explicit forest landscape simulation framework applied in the Swedish boreal forest. We demonstrate that bioenergy extraction scenarios, differing in the level of removal of biomass, can have significant effects on dead wood volumes. Although all of the scenarios led to decreasing levels of dead wood, the scenario aimed at species conservation led to highest volumes of dead wood (about 10 m3 ha-1) and highest connectivity of dead wood patches (mean proximity index of 78), whilst the scenario aimed at reaching zero fossil fuel targets led to the lowest levels (about 8 m3 ha-1) and least connectivity (mean proximity index of 7). Our simulations stress that further exploitation of dead wood from sites where volumes are already below suggested habitat thresholds for saproxylic species will very likely have further negative effects on dead wood dependent species.

Are we restoring enough? : Simulating impacts of restoration efforts on the suitability of forest landscapes for a locally critically endangered umbrella species
Hof, A.R. ; Hjältén, J. - \ 2018
Restoration Ecology 26 (2018)4. - ISSN 1061-2971 - p. 740 - 750.
Habitat restoration is often implemented to mitigate the negative effects of intensive forestry on biodiversity. It may be increasingly adopted in future to alleviate additional negative effects of climate change. Ascertaining the restoration effort needed to fulfill project goals is difficult. Insights may be gained through simulating the effects of restoration efforts on landscape dynamics through time. Here we used a spatially explicit landscape simulation model to simulate the effects of different restoration efforts on forest landscapes in Sweden to assess the level of mitigation that is needed to allow viable populations of the locally critically endangered White-backed Woodpecker (Dendrocopos leucotos); an umbrella species whose protection may serve the protection of a range of other species. Based on the goals of the protection plan for the species, which reflect its habitat requirements, we evaluated which of several restoration scenarios could fulfill goals with respect to (1) the amount of deciduous forest; (2) the amount of dead wood; and (3) the age of the forest. We found that whereas it may be relatively easy and quick to acquire high levels of dead wood, increasing the proportions of deciduous forest and of old forests require considerably more time and effort. Also, current management actions would not be sufficient to create the required amount of habitat to conserve the White-backed Woodpecker in our study region. Simulations like ours can provide valuable information about the levels of restoration needed through time to fulfill project goals and may prevent wasting valuable resources, time, effort, and money.
Compromises in data selection in a meta-analysis of biodiversity in managed and unmanaged forests: response to Halme et al.
Paillet, Y. ; Bergès, L. ; Hjältén, J. ; Ódor, P. ; Avon, C. ; Bernhardt-Römermann, M. ; Bijlsma, R.J. ; Bruyn, L. De; Fuhr, M. ; Grandin, U. ; Kanka, R. ; Lundin, L. ; Luque, S. ; Magura, T. ; Matesanz, S. ; Mészáros, I. ; Sebastià, M.T. ; Schmidt, W. ; Standovár, T. ; Tóthmérész, B. ; Uotila, A. ; Valladares, F. ; Vellak, K. ; Virtanen, R. - \ 2010
Conservation Biology 24 (2010)4. - ISSN 0888-8892 - p. 1157 - 1160.
ancient black art - pseudoreplication
Biodiversity Differences between Managed and Unmanaged Forests: Meta-Analysis of Species Richness in Europe
Paillet, Y. ; Bergès, L. ; Hjältén, J. ; Ódor, P. ; Avon, C. ; Bernhardt-Römermann, M. ; Bijlsma, R.J. ; Bruyn, L. de; Fuhr, M. ; Grandin, U. ; Kanka, R. ; Lundin, L. ; Luque, S. ; Magura, T. ; Matesanz, S. ; Mészáros, I. ; Sebastià, M.T. ; Schmidt, W. ; Standovár, T. ; Tóthmérész, B. ; Uotila, A. ; Valladares, F. ; Vellak, K. ; Virtanen, R. - \ 2010
Conservation Biology 24 (2010)1. - ISSN 0888-8892 - p. 101 - 112.
old-growth forests - broadleaved temperate forests - saproxylic beetles - dead wood - layer vegetation - boreal forests - windstorm disturbance - landscape scale - natural forests - land-use
Past and present pressures on forest resources have led to a drastic decrease in the surface area of unmanaged forests in Europe. Changes in forest structure, composition, and dynamics inevitably lead to changes in the biodiversity of forest-dwelling species. The possible biodiversity gains and losses due to forest management (i.e., anthropogenic pressures related to direct forest resource use), however, have never been assessed at a pan-European scale. We used meta-analysis to review 49 published papers containing 120 individual comparisons of species richness between unmanaged and managed forests throughout Europe. We explored the response of different taxonomic groups and the variability of their response with respect to time since abandonment and intensity of forest management. Species richness was slightly higher in unmanaged than in managed forests. Species dependent on forest cover continuity, deadwood, and large trees (bryophytes, lichens, fungi, saproxylic beetles) and carabids were negatively affected by forest management. In contrast, vascular plant species were favored. The response for birds was heterogeneous and probably depended more on factors such as landscape patterns. The global difference in species richness between unmanaged and managed forests increased with time since abandonment and indicated a gradual recovery of biodiversity. Clearcut forests in which the composition of tree species changed had the strongest effect on species richness, but the effects of different types of management on taxa could not be assessed in a robust way because of low numbers of replications in the management-intensity classes. Our results show that some taxa are more affected by forestry than others, but there is a need for research into poorly studied species groups in Europe and in particular locations. Our meta-analysis supports the need for a coordinated European research network to study and monitor the biodiversity of different taxa in managed and unmanaged forests
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