Micro-scale ecosystem differentiation and pollination network of the extensive green roof of the Terra Research Center
Promotor(s) : Mahy, Grégory
Date of defense : 24-Aug-2020 • Permalink :
|Title :||Micro-scale ecosystem differentiation and pollination network of the extensive green roof of the Terra Research Center|
|Author :||Delruelle, Anna|
|Date of defense :||24-Aug-2020|
|Advisor(s) :||Mahy, Grégory|
|Committee's member(s) :||Monty, Arnaud
|Keywords :||[en] Green roof, analogous habitat, CSR strategies, LHS traits, Moss colonization, substrate differenciation, Ecosystem differenciation, micro-enivronmental factors, pollinator networks, plant-pollinator interactions|
|Discipline(s) :||Life sciences > Environmental sciences & ecology|
|Target public :||Researchers|
Professionals of domain
|Institution(s) :||Université de Liège, Liège, Belgique|
|Degree:||Master en bioingénieur : gestion des forêts et des espaces naturels, à finalité spécialisée|
|Faculty:||Master thesis of the Gembloux Agro-Bio Tech (GxABT)|
[fr] Green roofs are often praised for their contribution to supporting biodiversity. However, their
ecological performance depends on their design and environmental conditions. This work addresses
various ecological components of the roof of the TERRA building, three years after its installation. It
focuses on two themes.
The first one addresses the differentiation of the ecosystem over time according to the depth of the
substrate and the amount of sunlight received. Functional and taxonomic approaches revealed that
the interannual variation in the plant communities of the roof was greater than the variations caused
by substrate depth and sunlight. Over time, the communities evolved towards a more competitive and
less stress-tolerant strategy. The analysis of the LHS traits suggested a community response to climatic
events, particularly to the drought of spring 2020. After three years, a slight differentiation of
substrates according to micro-environmental conditions was observed but was not the origin of the
differentiation of plant communities.
The second theme focuses on the plant-pollinator network of the roof. The results show a low species
diversity of pollinators, including only generalist pollinators. The evolution of insect captures and of
the presence of flowering species within the quadrats suggests that greater plant abundance and
diversity are needed to ensure the continuous delivery of floral resources to pollinators.
These two themes provide knowledge about the actual performances of the roof of the TERRA building
and suggest the need for further research on the long-term resilience of green roof plant communities.
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