0000000000046012
AUTHOR
Jean-charles Bouvier
showing 10 related works from this author
Les effets conjugués de la gestion parcellaire et du contexte paysager et de sa dynamique sur les bioagresseurs et les niveaux de régulation biologiq…
2017
International audience; De nombreux travaux ont mis en évidence que les caractéristiques du paysage environnant les parcelles agricoles influencent les abondances d’ennemis naturels et le niveau de régulation biologiquedans les cultures. Les effets du paysage sur l’abondance de bio-agresseurs sont par contre encore peu étudiés. Les effets du paysage sur la régulation biologique sont parfois contradictoires, souventspécifiques aux sites et de ce fait encore peu généralisables. Des travaux récents suggèrent que ces variations de réponse peuvent résulter d’interactions entre gestion parcellaire et contexte paysager,avec des effets conditionnels du paysage selon le type de gestion parcellaire e…
Introduction du séminaire. SEBIOPAG-PHYTO déterminants agricoles parcellaires et paysagers des variations de niveaux de régulation biologique
2017
Prod 2017-344b SPE équipe EA GESTAD INRA; National audience; Le niveau de compréhension des processus écologiques et de leurs interactions avec les activités agricoles est insuffisant pour que les agriculteurs mobilisent ou intègrent la biodiversité et ses services dans leurs décisions de gestion. En effet, la plupart des études portent sur la biodiversité taxonomique et peu sur la régulation biologique. Elles considèrent les activités agricoles à un grain grossier et à l’échelle annuelle, d’où une impossibilité d’identifier des modalités de conduite technique des exploitations agricoles utiles pour renforcer les régulations biologiques. En parallèle, l’intégration de résultats scientifique…
Comment favoriser les services écosystémiques assurés par la biodiversité des paysages agricoles ? Intérêts d’un réseau de sites d’observation à long…
2014
Atteindre l’objectif affiché de réduction du niveau d’usage de produits phytosanitaires tout en maintenant les niveaux de production des cultures implique la mise en place de stratégies de protection des cultures alternatives à la lutte chimique. L’adoption de pratiques plus favorables à la biodiversité dans les agroécosystèmes pourrait contribuer à augmenter les services de régulation biologique des ravageurs de culture. Il est établi que la biodiversité des milieux cultivés est modulée par des facteurs naturels et anthropiques agissant à différentes échelles spatiales, allant de la parcelle agricole au paysage, mais la compréhension des mécanismes écologiques qui produisent ces effets res…
Landscape scale and local crop protection intensity affect the abundance of the codling moth and its predation and parasitism in apple orchards
2017
International audience; One important feature that may explain variation in pest abundance and pest biocontrol in crops is the land-use intensity in the landscapes. We report results from three studies in which we tried to address this question by assessing whether amount of semi-natural habitat and/or pesticide use at both local and landscape scales affected the abundance of codling moth, its parasitism and predation of sentinel eggs in commercial apple orchards of south-eastern France. Our results indicate that in this landscape there is indeed a significant effect of the pesticide use intensity at both the local and the landscape scales on these variables
Landscape composition and farming practices affect the abundance of the codling moth and its predation and parasitism in apple orchards
2016
National audience; There is increasing recognition that landscape management could contribute to sustainable pest control. However, while many studies indicate that the proportion of semi-natural habitat over the landscape correlates positively with the abundance and diversity of natural enemies in elds, results are more equivocal concerning the reduction of pest abundance. This last result is possibly due to the diversity of land-use intensity in the landscapes. In the present studies, we assessed whether amount of semi-natural habitat and pesticide use at both local and landscape scales a ected the abundance of codling moth (Cydia pomonella, lepidoptera), its parasitism and predation of s…
Interaction of climate change with effects of conspecific and heterospecific density on reproduction
2020
We studied the relationship between temperature and the coexistence of great tit Parus major and blue tit Cyanistes caeruleus, breeding in 75 study plots across Europe and North Africa. We expected an advance in laying date and a reduction in clutch size during warmer springs as a general response to climate warming and a delay in laying date and a reduction in clutch size during warmer winters due to density-dependent effects. As expected, as spring temperature increases laying date advances and as winter temperature increases clutch size is reduced in both species. Density of great tit affected the relationship between winter temperature and laying date in great and blue tit. Specifically…
Avian biodiversity: impacts of pest management strategies and landscape in South-Eastern French apple orchards
2008
National audience; In French apple orchards, the predominant conventional management strategy has resulted insecticide resistance in major pests like codling moth and an increased frequency of environmentally harmful insecticide applications. Organic agriculture as well as IPM represent alternatives to this situation. Impacts on the avifauna of three different management strategies (organic, conventional and integrated) were studied during three years in 15 commercial apple orchards. These orchards were situated around Avignon and had similar contexts in terms of local and landscape features. Our results show that the avifauna differ significantly among the three management strategies with …
Bird populations most exposed to climate change are less responsive to climatic variation
2020
AbstractThe phenology of many species shows strong sensitivity to climate change; however, with few large scale intra-specific studies it is unclear how such sensitivity varies over a species’ range. We document large intra-specific variation in phenological sensitivity to temperature using laying date information from 67 populations of two European songbirds covering a large part of their breeding range. Populations inhabiting deciduous habitats showed stronger phenological sensitivity compared with those in evergreen and mixed habitats. Strikingly, however, the lowest sensitivity was seen in populations that had experienced the greatest change in climate. Therefore, we predict that the st…
Disentangling local agronomic practices from agricultural landscape effects on pest biological control
2019
International audience; The biological control of crop pests is a valuable service provided by various beneficial organisms that are naturally present in agricultural landscapes. Semi-natural habitats has long been recognized as essential to preserve beneficial insects, but proof of their efficiency to enhance biological control of pests remains non conclusive. Here, we examined the variability of landscape effect on biological pest control and the way local agronomic practices may modulate it. Biological pest control was monitored in 80 commercial fields (arable crops and orchards) during three consecutive years in four contrasting French agricultural landscapes distributed along a double …
Interspecific variation in the relationship between clutch size, laying date and intensity of urbanization in four species of hole-nesting birds
2016
Marie Vaugoyeau [et al.]