Vascular Epiphytes and Parasitic Plants on Vitellaria paradoxa Gaertn. (Sapotaceae) in the Sudano-Guinean Savannas of Ngaoundere, Cameroon
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Keywords

shea-butter tree
vascular epiphytes
parasitic plant
humid savanna habitats
Ngaoundere
Cameroon

How to Cite

Ibrahima, A., Mapongmetsem, P. M., Mompea, H. M., Moussou, L., & --, N. (2006). Vascular Epiphytes and Parasitic Plants on Vitellaria paradoxa Gaertn. (Sapotaceae) in the Sudano-Guinean Savannas of Ngaoundere, Cameroon. Selbyana, 27(1), 72–78. Retrieved from https://ojs.test.flvc.org/selbyana/article/view/121325

Abstract

This study evaluates the density and distribution of parasitic plants and vascular epiphytes of the shea-butter tree (Vitellaria paradoxd) in the Ngaoundere savannas. The study was conducted in three savanna habitats: forest canopy (gallery or riverine), hill savanna, and plains savanna (open or plateau). For each tree, three strata were considered: basal trunk, middle section, and treetop. The design of the experiment consisted of a split-plot with six replicates. Habitats received the main treatment, with species and strata corresponding to sub-treatments. The localities were the replicates. Data collected on the density of epiphytes and parasites of the shea-butter tree showed common flora consisting of six holo-epiphytic orchids (Calyptrochilum christyanum, Graphorkis lurida, Polystachya odorata, Rangaeris rhipsalisocia, Angraecum angustum, and Tridactyle tridactylites), one hemi-epiphytic fig (Ficus thonningii), and one mistletoe (Tapinanthus globiferus ssp. apodanthus). Ecological requirements were found to differ for the epiphytes and the parasitic plant. Epiphytes preferred humid habitats, mainly the forest canopy and middle section of the trees; whereas infestation points of Tapinanthus globiferus were located mostly on the canopy fringes. Afin d'évaluer la flore parasite et épiphytique du karité (Vitellaria paradoxa) dans les savanes de Ngaoundéré, une étude a été menée dans trois (3) milieux: galerie forestière, savane planitière et colline. Trois strates étaient retenues par arbre: base, milieu et cime de l'arbre. Le dispositif expérimentale était un split-plot à 6 répétitions. Les milieux ou habitats représentent le traitement principal alors que les espèces (epiphytes et parasites) et les strates constituent le sous— traitement. Les localités étaient les répétitions. Les données collectées portaient sur la densité des epiphytes et des parasites du karité. Les résultats montrent que la flore est composée de six holo-épiphytes (Calyptrochilum christyanum, Graphorkis lurida, Polystachya odorata, Rangaeris rhipsalisocia, Angraecum angustum et Tridactyle tridactylites), d'une hemiépiphyte (Ficus thonningii) et d'un parasite (Tapinanthus globiferus ssp. apodianthus). Les epiphytes adoptent en général un comportement mésophile: la galerie forestière et le milieu d'arbres constituent leurs milieux de prédilection, alors que le parasite préfère le cime des arbres (xérophile).

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