Tropical Ecology and Conservation [Monteverde Institute]

Alternative Title

Depredación de semillas de Persea americana por Dasyprocta punctata en Monteverde, Costa Rica

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Publication Date

November 2005

Abstract

Dasyprocta punctata (Rodentia: Dasyproctidae), a scatter-hoarding rodent, plays an important role in seedling recruitment and tropical forest composition. (Herrera and Pellmyr 2002) The purpose of this study was to see if D. punctata maximizes its fitness by behaving as a density-dependent forager, and if the scatter-hoarding caching behavior of D. punctata is aiding the fitness of Persea americana (Lauraceae). P. americana seeds were presented to D. punctata in three distinct densities at the Santuario Ecológico in Cerro Plano, Costa Rica to observe individual seed fate. No significant difference was found for the fates of P. americana seeds between the three densities (p = 0.8651, Chi–square = 0.2900, df = 2). However, more seeds were cached than eaten, partially eaten, or untouched (Two-way ANOVA, p = 0.0002, < 0.0001, < 0.0001, respectively, df = 3). This study gives evidence that D. punctata is a density-independent forager, possibly due to seed satiation (overabundance of seeds), which aids the fitness of P. americana via caching. Dasyprocta punctata (Rodentia: Dasyproctidae), es un roedor que deposita las semillas debajo de la tierra; este animal juega un papel importante en el reclutamiento de semillas y en la composición del bosque tropical (Herrera y Pellmyr 2002). El propósito de este estudio fue determinar si D. punctata maximiza sus adaptaciones al comportarse como un depredador dependiente de la densidad, y si el comportamiento de esconder las semillas ayuda a Persea americana (Lauraceae). Las semillas de P. americana fueron presentadas a D. punctata en tres densidades diferentes en el Santuario Ecológico en Cerro Plano, Costa Rica, para observar el destino de cada semilla. No se encontraron diferencias significativas para el destino de las semillas de P. americana entre las tres densidades (p = 0.8651, Chi-square = 0.2900, df = 2). Sin embargo, enterraron más semillas de las que se comieron, fueron parcialmente comidas, o no las tocaron del todo (ANOVA, p = 0.0002, < 0.0001, < 0.0001, respectivamente, df = 3). Este estudio proporcionó evidencia de que D. punctata es un depredador independiente de la densidad de semillas; posiblemente debido a la saciedad (Sobreabundancia de semillas), lo que ayuda a la adaptación de P. Americana.

Keywords

Central American agouti, Pizote Centroamericano, Mammals, Mamiferos, Costa Rica--Puntarenas--Monteverde Zone--Cerro Plano, Costa Rica--Puntarenas--Zona de Monteverde--Cerro Plano, CIEE Fall 2005, CIEE Otoño 2005

Description

Student affiliation : Department of Comprehensive Sciences, Villanova University Digitized by MVI

Subject: topical

Central American agouti; Pizote Centroamericano; Mammals; Mamiferos; CIEE Fall 2005; CIEE Otoño 2005

Subject: geographic

Costa Rica--Puntarenas--Monteverde Zone--Cerro Plano; Costa Rica--Puntarenas--Zona de Monteverde--Cerro Plano

Genre

Reports

Holding Location

Monteverde Institute MVI

Identifier

M39-00271

Seed predation on Persea americana by Dasyprocta punctata in Monteverde, Costa Rica

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