Does landscape heterogeneity modify the trade-off between production and biodiversity? Muriel Tichit

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  • 1. Does landscape heterogeneity modifythe trade-off between production and biodiversity? Rodolphe Sabatier & Muriel Tichit INRA SAD – Sciences for Action and Development Division, PARIS DIET AGRICULTURE ENVIRONMENT
  • 2. Stating the problem Explaining ‘Landscape Heterogeneity’ compositionnal heterogeneity + + + after Fahrig 2011 200 m 200 m structural heterogeneity + + +
  • 3. Stating the problem‘Biodiversity needs Benton 2003 heterogeneity’ Tscharntke 2005 Fahrig 2011 = qualitative reviews  need for quantificationsLandscape simplification – mechanization and field enlargement – use of chemical inputs in large areas – loss of semi natural elements – …
  • 4. Stating the problem To what extent can biodiversity be enhanced by increasing landscape heterogeneity? biodiversity production
  • 5. Case study – A grassland landscape (5000 ha) with 50 beef cattle farms
  • 6. Case study – A grassland landscape (5000 ha) with 50 beef cattle farms – Bird sp. which life cycle is deeply linked to management practices fecundity survival
  • 7. Sabatier 2010Spatially explicit dynamic model Teillard 2010 50% 25% 25% Farm Field Landscape mowing heavy (productive) grazing light (ecological) grazing
  • 8. Relative effect of composition and structure Sabatier 2010 bird population size Bird growth rate herbage production (LU.days.ha-1)
  • 9. Relative effect of composition and structure Sabatier 2010 Composition bird population size Bird growth rate herbage production (LU.days.ha-1) mowing (39%) heavy (productive) grazing light (ecological) grazing
  • 10. Relative effect of composition and structure Sabatier 2010 Composition Structure bird population size bird population size Bird growth rate herbage production (LU.days.ha-1) landscape structure mowing 39% heavy (productive) grazing light (ecological) grazing
  • 11. Heterogeneity leverages the trade-off (in biodiversity) Sabatier 2010 bird population size herbage production (LU.days.ha-1) mowing 39% heavy (productive) grazing light (ecological) grazing
  • 12. Heterogeneity leverages the trade-off (in production) Sabatier 2010 bird population size herbage production (LU.days.ha-1) mowing heavy (productive) grazing light (ecological) grazing
  • 13. Conclusion • Heterogeneity leverages the tradeoff • The positive effect of heterogeneity derives from complementarities between management regimes • Heterogeneity more important for mobile species • Modifying landscape heterogeneity requires coordination between farmers
  • 14. Future challenges From possiblelandscapes to feasible landscapes Co-design of feasible landscapes with farmers and other stakeholders
  • 15. Thank you for your attentionFundings 2009-2012FarmBird project« Coviability models of FARMing and BIRD biodiversity » muriel.tichit@agroparistech.fr