Pre

1. Does landscape heterogeneity modify
the 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
quantifications
Landscape 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 2010
Spatially 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 possible
landscapes to feasible
landscapes
Co-design of feasible
landscapes with farmers
and other stakeholders

15. Thank you for your attention
Fundings 2009-2012
FarmBird project
« Coviability models of FARMing and BIRD biodiversity »
muriel.tichit@agroparistech.fr