Demography of Astrocaryum malybo H.Karst. (arecaceae) in Colombia, recommendations for its management and conservation

Abstract

The palm Astrocaryum malybo is an endangered species growing in forest remnants in the Caribbean lowlands of Colombia, where its spear leaves provide fiber for a flourishing artisanal activity. We studied the palm's population structure and dynamics near the town of Chimichagua, Cesar, in order to provide ecological information required for its management and conservation. We modeled population growth and fiber production in the next 20 years under different management scenarios using Integral Projection Models. Although there was a low proportion of seedlings and population structure was variable, the population would grow for the next 20 years, with an annual growth rate of 7.1%, yielding ca. 35 spear leaves/ha/year for artisanal activity. Simulations of the model show that the population is susceptible to alterations that affect the survival of individuals; removal of as few as 34 palms of any size per ha/year would cause the population to decrease, and spear leaf production will decline accordingly. Conversely, any increase in seedling growth or survival would lead to population growth. If properly managed, A. malybo is a key species for conservation of the dry forest relicts in the Caribbean lowlands of Colombia.