Budongo Forest (budongo + forest)

Distribution by Scientific Domains
Life Sciences100%

Terms modified by Budongo Forest

  • budongo forest reserve
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    Selected Abstracts

    Home ranges and survival of Nahan's Francolin Francolinus nahani in Budongo Forest, Uganda

    AFRICAN JOURNAL OF ECOLOGY, Issue 4 2009
    Eric Sande
    Abstract We studied home ranges, habitat use and survival of radio-tagged Nahan's Francolin in Budongo Forest Reserve, Uganda during July 1998,December 1999. We studied Nahan's Francolin in an unlogged nature reserve, in a compartment logged in 1947,1952 and in a compartment logged twice, in 1963,1964 and 1996,1997. Mean home range was 14.22 ± 1.35 ha (n = 17). The home range was significantly larger in the nature reserve than in the recently logged compartment. Birds spent more time during the day in areas with high understorey vegetation density but preferred to roost and nest between buttresses of large trees. Understorey vegetation density and canopy openness were significantly greater in the logged forest than in the nature reserve. Annual survival of adult Nahan's Francolins was 20.09 ± 7.33% (n = 23). Our results suggest that the maintenance of large trees and areas with high understorey vegetation density are both important for Nahan's Francolin. Résumé Nous avons étudié le territoire, l'utilisation de l'habitat et la survie de francolins de Nahan marqués dans la Réserve Forestière de Budongo, en Ouganda, entre juillet 1998 et décembre 1999. Nous avons étudié les francolins de Nahan dans une réserve naturelle non exploitée, dans une parcelle qui avait été exploitée entre 1947 et 1952 et dans une parcelle où des coupes de bois avaient eu lieu deux fois, en 1963,64 et en 1996,97. Le territoire moyen couvrait 14,22 ± 1,35 ha (n = 17). Le territoire était significativement plus grand dans la réserve naturelle que dans la parcelle récemment exploitée. Pendant la journée, les oiseaux passaient plus de temps dans les endroits où la végétation des sous-bois était très dense, mais ils préféraient se percher et nicher protégés par le rempart de grands arbres. La densité de la végétation des sous-bois et l'ouverture de la canopée étaient sensiblement plus grandes dans la forêt exploitée que dans la réserve naturelle. La survie annuelle des francolins adultes était de 20.09 ± 7.33% (n = 23). Nos résultats suggèrent que le maintien de grands arbres et de zones où la végétation des sous-bois est dense est très important pour le francolin de Nahan. [source]

    Cordia millenii: on the risk of local extinction?

    AFRICAN JOURNAL OF ECOLOGY, Issue 3 2009
    Fred Babweteera
    Abstract Selective logging of valuable tropical timber trees is a conservation concern because it threatens the long-term sustainability of forests. However, there is insufficient information regarding the postlogging recovery of harvested species. Here, I assessed the seed dispersal patterns, recruitment and abundance of Cordia millenii, a valuable timber tree in two Ugandan tropical rain forests that have been subjected to varying disturbance regimes. The aim was to determine the vulnerability of Cordia in these forests. The rate of seed dispersal was lower in the heavily disturbed Mabira Forest compared with the less disturbed Budongo Forest. Frugivores in Mabira were small-bodied individuals that spat seeds beneath fruiting trees, whereas 90% of the fruit in Budongo was consumed by large-bodied chimpanzees that disperse seeds over long distances. Juveniles of Cordia were not found in the closed forest, although they were found in forest gaps in Budongo but not Mabira. Mature tree density was higher in Budongo compared with Mabira. Lack of effective seed dispersal coupled with the inability of seedlings of Cordia to establish under closed canopy account for the arrested recruitment in Mabira. Enrichment planting in felling gaps is necessary to avoid local extinction of Cordia in forests without large vertebrates. Résumé L'abattage sélectif des espèces précieuses d'arbres tropicaux inquiète le milieu de la conservation parce qu'il menace la durabilité des forêts à long terme. Cependant, il n'y a pas assez d'informations au sujet de la restauration des espèces prélevées après l'abattage. Ici, j'ai évalué les schémas de dispersion des semences, le recrutement et l'abondance de Cordia millenii, une espèce d'arbre prisée, dans deux forêts tropicales pluviales d'Ouganda qui ont été soumises à des régimes de perturbation variables. Le but était de déterminer la vulnérabilité de Cordia dans ces forêts. Le taux de dispersion des graines était plus faible dans la forêt très perturbée de Mabira que dans la forêt de Budongo, moins dérangée. Les frugivores de Mabira étaient des individus de petite taille qui recrachaient les graines sous les arbres producteurs des fruits alors que 90% des fruits de Budongo étaient consommés par des chimpanzés qui peuvent disperser les semences sur le longues distances. On n'a pas trouvé de juvénile de Cordia dans la forêt fermée; on en trouvait dans des clairières dans la forêt de Budongo, mais pas dans celle de Mabira. La densité des arbres matures était plus haute à Budongo qu'à Mabira. Le manque de dispersion efficace des graines, coupléà l'incapacité des semences de Cordia de s'établir sous une canopée fermée, intervient dans l'arrêt du recrutement à Mabira. Il est nécessaire de pratiquer un enrichissement des plantations dans les clairières déboisées pour éviter l'extinction locale des Cordia dans les forêts qui n'abritent pas de grands vertébrés. [source]

    Production, seasonality and management of chimpanzee food trees in Budongo Forest, Uganda

    AFRICAN JOURNAL OF ECOLOGY, Issue 4 2007
    Mnason Tweheyo
    First page of article [source]

    Paternity and social rank in wild chimpanzees (Pan troglodytes) from the Budongo Forest, Uganda

    AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, Issue 3 2010
    Nicholas E. Newton-Fisher
    Abstract We analyzed patterns of paternity and male dominance rank in the Sonso community of wild East African chimpanzees (Pan troglodytes schweinfurthii) in the Budongo Forest, Uganda. Our major objective was to determine whether and how social rank influenced paternity success. We successfully genotyped 52 individuals at up to nine microsatellite loci, using DNA extracted from fecal samples. Of 24 offspring analyzed, we identified sires for 21. Paternity success was significantly correlated with social rank, with alpha males siring a disproportionate number of offspring. However, both middle- and low-ranking males also fathered offspring, and the priority-of-access model provided a relatively poor prediction of which males would be successful and under what circumstances. The concentration of paternities among only seven males and the tendency for high-ranking males to sire offspring of multiparous females suggest that both individual variation in male quality and the resource value of particular females may be mediating factors. In comparison with other chimpanzee studies, our results support the hypothesis that larger male cohort size reduces the ability of the alpha male to monopolize females, though within our study, male number did not affect the success of the alpha. Successful sires were not necessarily those who achieved the highest mating success with the females whose offspring they sired, but were those who demonstrated higher investment by spending significantly more time in association with these females. Finally, we estimate extra-group paternity at 0,5%, supporting other evidence that the community serves as the primary reproductive unit in chimpanzees. Am J Phys Anthropol 2010. © 2009 Wiley-Liss, Inc. [source]

    Temperature's influence on the activity budget, terrestriality, and sun exposure of chimpanzees in the Budongo Forest, Uganda

    AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, Issue 2 2009
    Valerie P. Kosheleff
    Abstract Chimpanzee (Pan troglodytes schweinfurthii) activity budget, terrestriality, and sun exposure were found to be influenced by the immediate environmental temperature. Thirty adult chimpanzees in the Budongo Forest, Uganda, were observed for 247 h. Temperatures in the shade and sun, sky cover, sun exposure, activity, and terrestriality were recorded at 5-min intervals at <15 m from the center of the party. Terrestriality frequency was 26.5% for females and 41.5% for males. Terrestriality and resting both show a significant positive correlation with temperature in the sun. Controlling for seven potential confounding factors, temperature in the sun remained the strongest predictor of terrestriality. The difference between temperatures in the sun and shade had a significant effect on chimpanzee sun exposure frequency. Time spent continuously in the sun was negatively correlated with temperature, beginning to decrease around 30°C, and markedly decreasing around 40°C. A concurrent experiment determined that dark pelage (lacking physiological coping mechanisms) exposed to the same solar regime can easily reach 60°C within minutes. This study indicates that both temperature in the sun and sun exposure play a role in influencing chimpanzee activity behavior, and specifically suggests that chimpanzees thermoregulate behaviorally both by moving to the ground and by decreasing their activity level. These results, in the context of deforestation and increasing global temperatures, have physiological and conservation implications for wild chimpanzees. Am J Phys Anthropol, 2009. © 2008 Wiley-Liss, Inc. [source]

    Influence of Forest Type and Tree Species on Canopy-Dwelling Beetles in Budongo Forest, Uganda,

    BIOTROPICA, Issue 3 2000
    Thomas Wagner
    ABSTRACT Beetles were collected on 64 trees of four species (Cynometra alexandri C. H. Wright, Rinorea beniemis (Welwitsch ex Olivier) Kuntze, Teclea nobilis Delile, and Trichilia rubescens Olivier) in Budongo Forest, Uganda, using an insecticidal fogging technique. Selected tree species were abundant, taxonomically not closely related, and different in the shape of leaves, growth form, and size, with heights between 7 and 35 m. Trees were fogged in an old primary forest stand, in an area of secondary forest where selective logging was performed, and in a swamp forest. Eight conspecific trees per forest type were fogged. A total of 29,736 beetles were collected from all trees that could be assigned to 1433 (morpho)-species; 41.6 percent were singletons and 89.6 percent of species were found with less than ten individuals. Abundant beetle taxa included Latridiidae (N= 4093), Chrysomelidae (3952), Staphylinidae (2931), Apioninae (2621), and Curculionidae (2457). Most species-rich groups were Staphylinidae (N= 196 spp.), Curculionidae (189), and Chrysomelidae (148). Abundance increased in the order: primary < secondary < swamp forest. Due to the relatively high dominance of some species in the secondary forest, species richness increased in the order: secondary < primary < swamp forest. Beta diversity measures and factor analysis showed distinct differences among forest types but higher similarity of beetle communities on different tree species within one forest type. The taxonomic distribution of beetles in the secondary forest was more heterogeneous than in the primary forest. Analyses of the data revealed low host specificity even for phytophagous beetles, underlining the importance of habitat structure and chance effects on the spatial distribution of beetles in the canopy of Budongo Forest. [source]