• Français
  • English

Clémentine Durand-Bessart PhD thesis

Analysis of seed dispersal networks between trees and frugivores in African tropical forests

Started in october 2018

Funding: doctoral grant

SUpervisors: François Bretagnolle & Colin Fontaine

 

Abstract

Exceptional large vertebrate species are hosted in the tropical forest of Africa such as elephant, gorilla, chimpanzee or buffalos. Actually, these forests are under alarming defaunation process that, beyond the simple ethical problem, raise the problem of the consequence of the decline of these species on the functioning of this ecosystem. In order to understand these aspects, and to evaluate the resilient capacities of these forests, we focalise in the mutualistic bipartite network of seed dispersal by frugivorous vertebrates. To do so, we have compiled an exhaustive database concerning the interactions among tree species and vertebrate frugivorous of African tropical rainforests. The constitution of this database results from a collaboration among several searchers working on different sites through African forests. The database consist of about 8000 entries and concern 800 tree species and 200 frugivorous species. The objective of this phD project is to analyse and to compare the different network structures (modularity, nestedness, connectivity…) and to evaluate the robustness of the different networks to the progressive species extinction. Such analytic approach will also enable to explore the relative seed dispersal effectiveness of the different frugivorous species in relation with the functional traits of the seeds and fruits .Finally, an experimental approach in the national park of Moukalaba-Doudou (Gabon) will be planned in order to validate some predictions or results obtained from the analysis of the database.

 

Keywords

Tropical ecology, seed dispersion, African fauna, mutualist networks

 

Thesis advisory panel

François Bretagnolle (supervisor), Biogéosciences, Dijon
Colin Fontaine (supervisor) – CESCO, Paris
Doyle McKey, CEFE, Montpellier
Elisa Thebault, CNRS

extrait:
lien_externe:
titre_these:
date_de_debut_these:
2018-10
kc_data:
a:8:{i:0;s:0:"";s:4:"mode";s:0:"";s:3:"css";s:0:"";s:9:"max_width";s:0:"";s:7:"classes";s:0:"";s:9:"thumbnail";s:0:"";s:9:"collapsed";s:0:"";s:9:"optimized";s:0:"";}
kc_raw_content:

Analysis of seed dispersal networks between trees and frugivores in African tropical forests

Started in october 2018

Funding: doctoral grant

SUpervisors: François Bretagnolle & Colin Fontaine

 

Abstract

Exceptional large vertebrate species are hosted in the tropical forest of Africa such as elephant, gorilla, chimpanzee or buffalos. Actually, these forests are under alarming defaunation process that, beyond the simple ethical problem, raise the problem of the consequence of the decline of these species on the functioning of this ecosystem. In order to understand these aspects, and to evaluate the resilient capacities of these forests, we focalise in the mutualistic bipartite network of seed dispersal by frugivorous vertebrates. To do so, we have compiled an exhaustive database concerning the interactions among tree species and vertebrate frugivorous of African tropical rainforests. The constitution of this database results from a collaboration among several searchers working on different sites through African forests. The database consist of about 8000 entries and concern 800 tree species and 200 frugivorous species. The objective of this phD project is to analyse and to compare the different network structures (modularity, nestedness, connectivity…) and to evaluate the robustness of the different networks to the progressive species extinction. Such analytic approach will also enable to explore the relative seed dispersal effectiveness of the different frugivorous species in relation with the functional traits of the seeds and fruits .Finally, an experimental approach in the national park of Moukalaba-Doudou (Gabon) will be planned in order to validate some predictions or results obtained from the analysis of the database.

 

Keywords

Tropical ecology, seed dispersion, African fauna, mutualist networks

 

Thesis advisory panel

François Bretagnolle (supervisor), Biogéosciences, Dijon
Colin Fontaine (supervisor) – CESCO, Paris
Doyle McKey, CEFE, Montpellier
Elisa Thebault, CNRS

titre:
Analyse des réseaux d'interactions mutualistes arbres - frugivores, des forêts tropicales africaines
nom:
Durand-Bessart
date_de_debut_these_numerique:
20181001

Log In

Create an account