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Selection: Jactel:H [8 articles] 

Publications by author Jactel:H.

Tree diversity reduces pest damage in mature forests across Europe

Biology Letters, Vol. 12, No. 4. (27 April 2016), 20151037,


Forest pest damage is expected to increase with global change. Tree diversity could mitigate this impact, but unambiguous demonstration of the diversity–resistance relationship is lacking in semi-natural mature forests. We used a network of 208 forest plots sampled along two orthogonal gradients of increasing tree species richness and latitudes to assess total tree defoliation in Europe. We found a positive relationship between tree species richness and resistance to insect herbivores: overall damage to broadleaved species significantly decreased with the number of ...


Biotic homogenization can decrease landscape-scale forest multifunctionality

Proceedings of the National Academy of Sciences, Vol. 113, No. 13. (29 March 2016), pp. 3557-3562,


[Significance] Numerous studies have demonstrated the importance of biodiversity in maintaining multiple ecosystem functions and services (multifunctionality) at local spatial scales, but it is unknown whether similar relationships are found at larger spatial scales in real-world landscapes. Here, we show, for the first time to our knowledge, that biodiversity can also be important for multifunctionality at larger spatial scales in European forest landscapes. Both high local (α-) diversity and a high turnover in species composition between locations (high β-diversity) were found to ...


The global spectrum of plant form and function

Nature, Vol. 529, No. 7585. (23 December 2015), pp. 167-171,


[Headlines] The authors found that the key elements of plant form and function, analysed at global scale, are largely concentrated into a two-dimensional plane indexed by the size of whole plants and organs on the one hand, and the construction costs for photosynthetic leaf area, on the other. [Abstract] Earth is home to a remarkable diversity of plant forms and life histories, yet comparatively few essential trait combinations have proved evolutionarily viable in today’s terrestrial biosphere. By analysing worldwide variation in six major traits ...


Biodiversity evaluation tools for European forests

Vol. 50 (2001)


The Biodiversity Evaluation Tools BETs for European forest presented in this report are the outcome of a pan-European project BEAR, bringing together expertise from 27 European research organisations. The main achievements are a common scheme of key factors of biodiversity applicable to European forests, European-level Forest Types for Biodiversity Assessment and a list of potential biodiversity indicators to assess forest biodiversity. Furthermore the report gives general advice for European and national level assessment and monitoriing of forest biodiversity. [\n] The BETs for ...


A multicriteria risk analysis to evaluate impacts of forest management alternatives on forest health in Europe

Ecology and Society, Vol. 17, No. 4. (2012),


Due to climate change, forests are likely to face new hazards, which may require adaptation of our existing silvicultural practices. However, it is difficult to imagine a forest management approach that can simultaneously minimize all risks of damage. Multicriteria decision analysis (MCDA) has been developed to help decision makers choose between actions that require reaching a compromise among criteria of different weights. We adapted this method and produced a multicriteria risk analysis (MCRA) to compare the risk of damage associated with ...


Tree diversity limits the impact of an invasive forest pest

PLoS ONE, Vol. 10, No. 9. (11 September 2015), e0136469,


The impact of invasive herbivore species may be lower in more diverse plant communities due to mechanisms of associational resistance. According to the “resource concentration hypothesis” the amount and accessibility of host plants is reduced in diverse plant communities, thus limiting the exploitation of resources by consumers. In addition, the “natural enemy hypothesis” suggests that richer plant assemblages provide natural enemies with more complementary resources and habitats, thus promoting top down regulation of herbivores. We tested these two hypotheses by comparing ...


Tree diversity reduces herbivory by forest insects

Ecology Letters, Vol. 10, No. 9. (1 September 2007), pp. 835-848,
Keywords: abies-balsamea   acalitus-rudis   albizia-guachapele   alsophila-pometaria   amblypelta-cocophaga   atta-cephalotes   betula-pendula   biodiversity   callophylum-brasiliense   cardiaspina-fiscella   cecidomyiidae   choristoneura-fumiferana   choristoneura-spp   chrysoptharta-bimaculata   corylus-avellana   curculio-elephas   dendroctonus-frontalis   dipteryx-panamensis   diversity   euclystis-spp   forest-pests   forest-resources   genipa-americana   hylobius-abietis   hypsipyla-robusta   lepidoptera   lymantria-dispar   matsucoccus-feytaudi   milicia-excelsa   myzocallis-coryli   neuroterus-spp   phyllobius-argentatus   phyllonorycter-spp   phytolyma-lata   picea-abies   picea-glauca   picea-sitchensis   pinus-densiflora   pinus-nigra-laricio   pinus-pinaster   pinus-strobus   pinus-sylvestris   pinus-taeda   pissodes-strobi   plant-pests   populus-angustifolia   pseudotsuga-menziesii   quercus-petraea   quercus-rotundifolia   quercus-suber   rhyacionia-frustrana   sonneratia-apetala   stigmella-spp   stryphnodendron-microstachyum   thaumetopoea-pytiocampa   thecodiplosis-japonensis   toona-ciliata   virola-koschnyi   vochysia-ferruginea   vochysia-guatemalensis   zeuzera-conferta  


Biodiversity loss from plant communities is often acknowledged to affect primary production but little is known about effects on herbivores. We conducted a meta-analysis of a worldwide data set of 119 studies to compare herbivory in single-species and mixed forests. This showed a significant reduction of herbivory in more diverse forests but this varied with the host specificity of insects. In diverse forests, herbivory by oligophagous species was virtually always reduced, whereas the response of polyphagous species was variable. Further analyses ...


Plantation forests and biodiversity: oxymoron or opportunity?

Biodiversity and Conservation In Biodiversity and Conservation, Vol. 17, No. 5. (1 May 2008), pp. 925-951,


Losses of natural and semi-natural forests, mostly to agriculture, are a significant concern for biodiversity. Against this trend, the area of intensively managed plantation forests increases, and there is much debate about the implications for biodiversity. We provide a comprehensive review of the function of plantation forests as habitat compared with other land cover, examine the effects on biodiversity at the landscape scale, and synthesise context-specific effects of plantation forestry on biodiversity. Natural forests are usually more suitable as habitat for ...

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