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Accueil du site → Doctorat → Chine → 2020 → Plant Richness,phylogenetic Diversity of Coastal Forests of East Africa and A Comprehensive Checklist of Plants of Kenya’s Coastal Region

University of Chinese Academy of Sciences (2020)

Plant Richness,phylogenetic Diversity of Coastal Forests of East Africa and A Comprehensive Checklist of Plants of Kenya’s Coastal Region

VERONICAH MUTELE NGUMBAU;

Titre : Plant Richness,phylogenetic Diversity of Coastal Forests of East Africa and A Comprehensive Checklist of Plants of Kenya’s Coastal Region

Auteur : VERONICAH MUTELE NGUMBAU;

Grade : Doctoral Dissertation 2020

Université : University of Chinese Academy of Sciences

Résumé Partiel
Fundamental knowledge of biodiversity and how it is distributed in its natural occurrence plus the underlying processes that influence it are crucial to the study of an ecosystem and its conservation.However,the limitation of information impedes society’s competence to find out the cause or significance of a problem or even to avoid further losses in an ecosystem.It becomes even harder to identify all the biological resources at risk because there is no exhaustive inventory of either fauna or flora of a particular region.Coastal forests of East Africa are considered as an exceptional biogeographical area with varied endemic flora and fauna and thus have been identified as one of the world’s biodiversity hotspots.However,the distribution patterns of plant diversity around the region have remained obscure.Nonetheless,many studies have focused on species richness and conservation of rare and endemic animal species,but less attention has been paid to the conservation of the plant phylogenetic metrics.This study is aimed at:1)understanding both phylogenetic diversity of vascular plants of the coastal forests of East Africa,plant distribution along the latitude,the conservation status of endemic plant taxa ;2)provide a comprehensive checklist,and distribution of endemic,threatened and near-threatened plant species found at the Kenya coastal region.A total of 32,922 specimen records from the coastal forests of East Africa,representing 5,056 species(including 717 endemics)belonging to 1284 genera and 199 families,were obtained from the Rain-bio database.This represents 22.39%,40.65%and 72.89%of species,genera,and families respectively found in tropical Africa.Plantlife forms found in the region were heterogeneously distributed from Northern to Southern parts of the region.Using phylogeny at genera level we calculated the phylogenetic diversity(PD)and standard effect size phylogenetic diversity(SES_PD).Consequently,we determined the latitudinal distribution of plant species and their life forms from north to the south region of East African coastal forests(00-250 S).Our results show that the phylogenetic diversity of the coastal forests of Eastern Africa is positively correlated with the species richness and most of the plots showed positive SES.PD meaning that species in these forests are distantly related hence having a high phylogenetic diversity.Plots with negative SES value could have been the ones that were located on the roads,farms since coastal forests are highly fragmented hence low phylogenetic diversity.Alternatively,this could be the area that have received little or even a few floristic studies.On the other hand,these regions could have experienced bias in the plant collections,whereby the collectors focus on a particular taxon and thus phylogenetic clustering.

Mots clés : Coastal forests; East Africa; Endemic species; New species; Plant diversity;

Présentation (CNKI)

Page publiée le 11 juin 2021