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      Vertebrate predation of Brazil-nuts ( Bertholletia excelsa, Lecythidaceae), an agouti-dispersed Amazonian seed crop: a test of the escape hypothesis

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          Abstract

          The effects of escape distance to parental trees and tree clusters on the removal of Brazil-nut seeds (Bertholletia excelsa, Lecythidaceae) by vertebrate seed predators were examined in an entirely undisturbed stand of Brazil-nut trees of eastern Amazonia. Population density estimates, based on line-transect censuses, are also presented forBertholletiatrees and agoutis (Dasyprocta leporina), the most important scatterhoarder and seed predator of Brazil-nuts at this site. Seed removal experiments were conducted within and outside a naturalBertholletiatree cluster (castanhal) during both the wet and dry seasons. While there were no within-cluster effects of escape distance from parent trees on seed removal rates, overall seed removal within the cluster was significantly greater than that well outside the cluster. Moreover, removal rates in the wet season were consistently higher than those in the dry season both within and outside the tree cluster. Results suggest that the probability of early seed survival forBertholletia, in relation to distance to seed sources, operates on different spatial scales, and that seed predators allocate greater foraging effort to scattered seeds during the fruitfall (wet) season, when buried seed stocks are being cached by agoutis.

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          Spacing Dynamics of a Tropical Rain Forest Tree: Evaluation of the Janzen-Connell Model

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            An Introduction to Generalized Linear Models

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              Early Consequences of Seed Dispersal for a Neotropical Tree (Virola surinamensis)

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                Author and article information

                Journal
                applab
                Journal of Tropical Ecology
                J. Trop. Ecol.
                Cambridge University Press (CUP)
                0266-4674
                1469-7831
                January 1997
                July 2009
                : 13
                : 01
                : 69-79
                Article
                10.1017/S0266467400010269
                c85b6103-4ef4-444d-a8ef-08ebbe847ae2
                © 1997
                History

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