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Effects of agricultural
intensifica2on on land snail
communi2es in alpine meadows
Master pre-final results
Lauriane Dani – 26th October 2016
Supervised by Jean-Yves Humbert

Sources:
•  hJp://snailstales.blogspot.ch/2007/11/vallonia-costata-new-backyard-snail.html
•  © Lauriane Dani

1

Outline
• 
• 
• 
• 
• 
• 
• 
• 
• 

Introduc2on
Material and methods
Research ques2ons
Results
Discussion
Limita2ons and cri2cs
Conclusion
Management recommenda2ons
Aknowledgement

2

Introduc2on
Tradi2onally managed alpine meadows = Biodiversity rich habitat
Since mid 20th century: farmers confronted to a difficult socio-economical context

Threatened by:

Agricultural intensifica/on

Land-abandonment

(if not sufficiently produc2ve)

(if slope too steep)

•  Bisses à sprinklers
•  Solid manure/no fer2lizer à high
amounts of slurry

•  Forest encroachment

(less maintenance)


Sources:
• 
hJp://www.musee-des-bisses.ch/event/conference-film-chant-bisses-ladakh
• 
hJp://www.suone.ch/files/suonen/41_2.JPG
• 
hJp://globestories.com/der-traum-vom-alpsommer/?lang=en
• 
hJp://www.jardipartage.fr/choisir-fumure-organique/


3

Introduc2on
Tradi2onally managed alpine meadow
Sources
• 
hJp://jardinet.a.j.f.unblog.fr/files/2012/11/
img_0767.jpg
• 
hJps://www.2.bund.de/en/bd/fields-of-ac2vity/
biodiversity-in-agricultural-landscapes/land-use-andlandscape-change/
•  © Lauriane Dani


Agricultural intensifica2on

Land abandonment

à Biodiversity loss ß
Effect on snail???

4

Introduc2on
plant species richness

*

*
*



*



*

*

yield



invertebrate
biomass



Objec/ve: to find a threshold of intensifica2on leading to a trade-off between
biodiversity and yields to avoid land-abandonment and extreme intensifica2on

low intensity

Trade-off?

high intensity
5

Snails
Food

The one who
eat your food

Sources:
•  hJps://thumbs.dreams2me.com/z/schnecken-als-feinschmeckerische-nahrung-21959125.jpg
•  hJp://s2ckeramoi.com/foret/6969-s2cker-mural-escargot-mage-salade.html


6

Introduc2on
•  Why snails?
– 
– 
– 
– 

Rela2vely easy to collect and iden2fy
Important detri2vorous and herbivorous taxon
Prey for vertebrates and invertebrates
Species on the Red list

« A bag of cold water that cannot even move unless it
leaks should not be able to survive outside a bog ».


Sources:
•  hJp://i.f1g.fr
•  hJps://inpn.mnhn.fr/

(Rollo and Wellington 1977)

7

Introduc2on
•  Why snails?
– 
– 
– 
– 

Easy to collect and iden2fy
Important detri2vorous and herbivorous taxon
Prey for vertebrates and invertebrates
Species on the Red list

–  Good bioindicators:
•  Narrow niche specificity
•  Low dispersal ability

sensi2ve to disturbances and
c h a n g e s i n e n v i r o n m e n t a l
condi2ons such as land-use changes


8

Introduc2on
•  Why snails?
– 
– 
– 
– 

Easy to collect and iden2fy
Important detri2vorous and herbivorous taxon
Prey for vertebrates and invertebrates
Species on the Red list

–  Good bioindicators:
•  Narrow niche specificity
•  Low dispersal ability

sensi2ve to disturbances and
c h a n g e s i n e n v i r o n m e n t a l
condi2ons such as land-use changes


–  Sensi2ve to pH, soil moisture and temperature,
trampling by caJle… à variables suscep2ble to vary
with agricultural intensifica2on

9


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