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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
presseminar2.pdf (PDF, 35.97 MB)
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