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Caractérisation de la distribution spatiale de Prioria balsamifera (Vermoesen) Breteler et Prioria oxyphylla (Harms) Breteler dans la Réserve Forestière de Yoko (République Démocratique du Congo)

par Bbidjo Tsoro, Vivien ;Luambua, Nestor Kashikija;Kumba, Sylvain;Mbayu, Faustin;Sabongo, Prosper;Katusi, Roger;Mopanga, Urbain;Hardy, Olivier J. ;Lisingo, Janvier
Référence Biotechnologie, agronomie, société et environnement, 30, 1, page (64-80)
Publication Publié, 2026-06-01

Article révisé par les pairs

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Résumé :

Description of the subject. The study of the spatial distribution of trees provides information on species ecology and forest dynamics. Such knowledge is important for the sustainable management of large African trees, including Prioria balsamifera (Vermoesen) Breteler and Prioria oxyphylla (Harms) Breteler. Objectives. This study aimed to (i) characterize the spatial distribution patterns of P. balsamifera and P. oxyphylla, (ii) highlight their intraspecific and interspecific relationships, and (iii) identify environmental factors that may explain their spatial structure. Method. Univariate and bivariate pair correlation functions were used to characterize spatial distribution patterns. Generalized linear models with a Poisson distribution, together with toroidal shift randomization tests, were applied to assess the effects of environmental factors on the spatial structure of Prioria. Results. Each Prioria species exhibits an aggregated spatial structure and spatial autocorrelation of trunk diameters, while sharing the same microhabitat. Their coexistence may be facilitated by functional trait differentiation, with P. balsamifera and P. oxyphylla displaying acquisitive and conservative resource-use strategies, respectively. An attraction between juveniles and adults of P. balsamifera was observed within a 500 m radius, with a less pronounced trend in P. oxyphylla. Finally, the abundance of individuals of both P. balsamifera and P. oxyphylla is significantly related to altitude. Conclusions. This study shows that the spatial distribution of these two Prioria species is linked to altitude, and that their coexistence is facilitated by some degree of ecological niche differentiation.