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Gembloux Agro-Bio Tech (GxABT)
Gembloux Agro-Bio Tech (GxABT)
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Explaining the distribution patterns of morphologically similar species and gene pools of a tropical tree genus (Erythrophleum) using functional and life-history trait approach

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Daher, Nassim ULiège
Promotor(s) : Fayolle, Adeline ULiège ; Gorel, Anaïs ULiège
Date of defense : 29-Aug-2018 • Permalink : http://hdl.handle.net/2268.2/5159
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Title : Explaining the distribution patterns of morphologically similar species and gene pools of a tropical tree genus (Erythrophleum) using functional and life-history trait approach
Translated title : [fr] Explication de la distribution géographique d'espèces et de populations génétiques morphologiquement proches d'un genre tropical (Erythrophleum) en utilisant une approche basée sur les traits fonctionnels et les traits d'histoire de vie
Author : Daher, Nassim ULiège
Date of defense  : 29-Aug-2018
Advisor(s) : Fayolle, Adeline ULiège
Gorel, Anaïs ULiège
Committee's member(s) : Hebert, Jacques ULiège
Monty, Arnaud ULiège
Lassois, Ludivine ULiège
Language : English
Number of pages : 45
Keywords : [en] Tropical forests, Central Africa, Cameroon, Erythrophleum, ecological specialisation, trade-offs, gene pools, functional traits, allometry, diversification, stress tolerance
Discipline(s) : Life sciences > Environmental sciences & ecology
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)

Abstract

[en] Aim : Erythrophleum species and gene pools, despite being morphologically similar, oc-
cupy contrasted habitats. The aim of this work is to determine if Erythrophleum species
and gene pools respond differently to shade and drought, to understand the underlying
mechanisms that explain these differences by measuring traits on control seedlings, and
finally to understand if these differences can explain their distribution patterns.
Location : Industrial site of Pallisco-CIFM in Mindourou, Cameroon, and two zones
in southern (Dja-and-Lobo department) and central Cameroon (Mba-and-Kim depart-
ment).
Methods : The work consisted of an in situ and a drought and shade experiment. Dur-
ing the in situ experiment, two zones where species or gene pools are coexisting were
sampled. During the drought/shade experiment, two modalities of drought (watered or
non watered) and two modality of light (low light and hight light) were tested on 190
seedlings from two species and six gene pools to compare their response to stress. At the
end of the experiment, functional traits were measured on 56 control seedlings.
Results : Allometric models have been calculated and phenophases compared for field
individuals sampled in the field of two gene pools. Differences of phenophases and crown
shape have been highlighted. No clear difference between species and gene pools were
observed experimentally in seedling survival and response to drought and shade. Differ-
ences of functional traits have been found between species and gene pools, suaW having
more drought-adapted traits than any other pool.
Main conclusions : Dry forests gene pools had more drought tolerant traits than pools
found in wetter forests, but did not show more resistance to drought or more sensitivity
to shade in the drought/shade experiment. A difference exist but is thin because of
the morphological proximity of the pools and species, supporting the ecological gradient
hypothesis.


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Author

  • Daher, Nassim ULiège Université de Liège > Gembloux Agro-Bio Tech

Promotor(s)

Committee's member(s)

  • Hebert, Jacques ULiège Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Gestion des ressources forestières et des milieux naturels
    ORBi View his publications on ORBi
  • Monty, Arnaud ULiège Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage
    ORBi View his publications on ORBi
  • Lassois, Ludivine ULiège Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Gestion des ressources forestières et des milieux naturels
    ORBi View his publications on ORBi
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  • Total number of downloads 125










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