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Balanites wilsoniana: regeneration with and without elephants

By Fred Babweteera, Peter Savill and Nick Brown

Abstract

Tropical forest trees that produce large fruits and/or large seeds are believed to be dependent on a few and often rare large vertebrates for dispersal. However, little is known about the population dynamics of such trees when they lose their specialised dispersers. This study examines the juvenile spatial distribution of <em>Balanites wilsoniana</em>, Dawe & Spraque, which is believed to be dependent solely on elephants for dispersal, in forests with and without elephants. Using camera traps, elephants were confirmed to be the only frugivores feeding and thus dispersing <em>Balanites wilsoniana</em> fruits. There was a high density of seedlings beneath adult trees in one forest without elephants, which was attributed to low seed and seedling predation in this forest. Nevertheless, it was only in the forest with elephants that juveniles by size revealed that saplings and poles are more likely to be found away from adult trees thus providing evidence that dispersal enhances juvenile survival. This study underlines the importance of seed dispersal for trees that cannot maintain their populations through seedlings germinating and surviving beneath adult conspecifics. The study also demonstrates that loss of vertebrates has ramifications for tree species dynamics above and beyond the loss of seed dispersers.The full-text of this article is not available in ORA, but you may be able to access the article via the publisher copy link on this record page

Topics: Plant Sciences, tropical rainforest, disturbance, fruit size, large vertebrates, dispersal and predation
Year: 2007
DOI identifier: 10.1016/j.biocon.2006.08.002
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