Business Sites Gardens as opportunity for Urban Biodiversity ?
Hortense Serret, September 26th
This 3-sentence summary covers the key points:
The document examines business site gardens in the Paris region as an opportunity for urban biodiversity, analyzing their spatial organization, ecological features, and how employees view them. It finds that while they make a small contribution to regional connectivity, some sites are strategically located and local connectivity is high in suburban areas. Field observations show business gardens support a variety of habitats and indigenous plant and animal species, contributing to the conservation and functionality of urban biodiversity.
1. Business Sites Gardens as opportunity
for Urban Biodiversity ?
Hortense SERRET
September, 26th
Doctorat financé par
Département Développement Durable d’
4. Research questions
o How are Business Sites Gardens spatially organized and what kind of
contribution do they have for urban connectivities ?
o What are their ecological features ?
Astrance
o How employees see those Gardens ?
4
5. What is a « Business Site Garden » ?
o Every green spaces around business sites buildings
8 700 ha in Paris region
Very heterogeneous sizes, until more than 100 ha
Astrance
15 % of housing gardens areas
23 % of parks and gardens
Double of wasteland surfaces
5
8. Business sites gardens areas per urbanization
classes (%)
Astrance
Proportion of business site gardens per
urbanization classes
3
2,5
2
1,5
1
0,5
0
Urban center
Dense urban
Suburban
Périurban
8
10. How Business Sites Gardens contribute to urban
connectivities ?
o Graph theory
Astrance
• Nodes = Habitat patches
• Links
Leat-cost path
• Dispersion capacity of a model species
o Landscape metrics
• Probability of Connectivity, PC (Saura et Pascual-Hortual 2007)
• Decomposition of PC (Saura et Pascal-Hortual 2010)
10
11. How Business Sites Gardens contribute to urban
connectivities ?
o Low contribution at global scale for global connectivities
o High contribution at local scale for global connectivities in
suburban areas
Astrance
• Recent urbanisation with Activitiy Parks organisation
o Low contribution in area for connectivities compared to other
green spaces (parks, housing gardens)
o Strategical location for connectivities : 10 % of business sites
highly contribute to coherence of connectivities
11
12. Field observations
o A study of 56 business green spaces
o Two areas
•
Astrance
•
« South » area : high density of urbanisation, high
land pression, few connectivities with other green
spaces
« Cergy » area : bigger green spaces, more open
landscape
o 28 business sites on each area
12
14. Contribution for Conservation and Fonctionnality
of urban biodiversity
o Conservation
Cynoglossum
officinal
Astrance
• Plants
94,2 % of indigenous species
14 % of urbanophobic plants
10 % of species are considered ‘in
regression’ ou ‘vulnerable ‘ in the region
• Birds
Presence of birds species which
population are declining at national scale
o Fonctionnality
• 70 % of entomogam plant species
• Extensive management promotes butterflies
sensitive to urbanisation
• Contribution to bats activity
• Presence of birds considered as indicators for
green connectivities
Achusa arvensis
Carduelis cannabina
Pyrrhula pyrrhula
Maniola jurtina
14
16. A project to involve compagnies in the
promotion of biodiversity on their sites
o Promotion of extensive management on
business sites
Astrance
o Biodiversity monitoring to evaluate efficiency of
practices changes
o Partnership with scientific community to share
data
16
17. Thank you !
Any questions ?
hortense.serret@gmail.com
Doctorat financé par
Département Développement Durable d’