Effect of farmland heterogeneity on multiple ES spatial variability and trade-offs

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This is an author’s version published in: http://oatao.univ-toulouse.fr/17488

To cite this version:

Sirami, Clélia and Gauffre, Bertrand Effect of farmland

heterogeneity on multiple ES spatial variability and trade-offs.

(2016) In: 5. International EcoSummit 2016. Ecological Sustainability: Engineering Change, 29 August 2016 - 1 September 2016 (Montpellier, France).

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Effect of farmland heterogeneity

on multiple ES spatial variability and trade-offs

Clélia Sirami, Bertrand Gauffre, The FarmLand consortium

1

www.farmland-biodiversity.org

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The role of agricultural landscape heterogeneity

Species di ver si ty % of semi-natural habitats

Proportion of

semi-natural habitats

Role studied/known

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Role studied/known

Implementation not always feasible

Proportion of

few semi-natural habitats

The role of agricultural landscape heterogeneity:

a paradox

Heterogeneity of the

large « farmland matrix »

Role ?

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Farmland heterogeneity

farmland configurational heterogeneity Fahrig et al. 2011 Semi-natural habitats Agricultural habitats

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Farmland heterogeneity

far mland compo sitio nal he ter og ene ity farmland configurational heterogeneity Fahrig et al. 2011 Semi-natural habitats Agricultural habitats

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Lleida Coteaux Camargue Goettingen PVDS East Anglia Armorique

A multi-region, multi-taxa, multi-ES project

Biodiversity (7 taxa)

Biological control

Pollination

Production

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2. Sampling site selection  1 x 1 km  2 independent gradients  60-90% semi-natural habitat  30-90 landscapes/region Total: 435 landscapes  3 representative fields (cereal, corn, grassland) Total: 1305 fields

Common protocols across regions

1. Landscape selection

Shannon diversity index of agricultural habitats

Tot al len gth of fi eld b or d er s 25 m 3. ES measures Total: 2795 species, 78000 aphids glued,…

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Farmland heterogeneity gradients

HCONFIG

Total length of field borders (m)

HC OMPO Sha nn on div er sity i nd ex of ag ri cult ur al hab it ats

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Testing the effect of farmland heterogeneity

Landscape selection:

435 landscapes

2 uncorrelated gradients across/among regions

limited variations in % semi-natural habitat within each region

Mixed model:

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Farmland heterogeneity effects

-0,2 -0,15 -0,1 -0,05 0 0,05 0,1 0,15 0,2 biodiversity biological control pollination production Es timate (95 % CI)

Farmland compositional heterogeneity

-0,4 -0,3 -0,2 -0,1 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 biodiversity biological control pollination production Es tim at e (9 5% C I)

Farmland configurational heterogeneity

-0,4 -0,3 -0,2 -0,1 0 0,1 0,2 0,3 biodiversity biological control pollination production Es timate (95 % CI)

-0,3 -0,2 -0,1 0 0,1 0,2 0,3 0,4 0,5 0,6 biodiversity biological control pollination production Es timate (95 % CI)

ES average

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True effect of configurational heterogeneity?

1 km 1 km HCONFIG Linear SN habitats Coteaux de Gascogne

Effect

?

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Testing the true effect of farmland heterogeneity

Landscape selection:

selection of a subset of 274 landscapes

correlations between explanatory var. across/among regions <0.4

Model 2:

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Farmland true heterogeneity effects

ES average ES spatial variability -0,4 -0,3 -0,2 -0,1 0 0,1 0,2 biodiversity biological control pollination production Es timat e (95 % CI)

-0,4 -0,2 0 0,2 0,4 0,6 0,8 biodiversity biological control pollination production Es timate (95 % CI)

-0,5 -0,4 -0,3 -0,2 -0,1 0 0,1 0,2 0,3 biodiversity biological control pollination production Es timate (95 % CI)

-0,5 -0,4 -0,3 -0,2 -0,1 0 0,1 0,2 0,3 0,4 0,5 0,6 biodiversity biological control pollination production Es timate (95 % CI)

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Response variations between taxa

Farmland true heterogeneity effects

-1,5 -1 -0,5 0 0,5 1 1,5 2 2,5 3 Es timat e (95 % CI)

-1 -0,5 0 0,5 1 1,5 2 2,5 Es timate (95 % CI)

ALL TAXA

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Multiple interactions

Bir d div er sity Bir d div er sity HCOMPO

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Take-home messages

 Farmland heterogeneity has a true positive effect on biodiversity - in particular bee, bird, plant, spider

 Positive effect on biological control - due to linear semi-natural elements. No effect on pollination and production.  Complex interactions :

Farmland heterogeneitySemi-natural % Practices

 Agricultural policies should start considering field

configuration while maintaining semi-natural habitats and agrochemical reduction

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