Variabilidad Intraespecifica de los Rasgos Anatómicos de Tres Especies de Bosque Seco Tropical en un Gradiente de Temperatura y Precipitación en Colombia

Abstract

The present study is to answer if there is intraspecific variation in the anatomical traits of the wood associated to mechanical support and water transport of three (3) species of tropical dry forest, Astronium graveolens Jacq, Enterolobium cyclocarpum (Jacq.) Griseb and Platymiscium pinnatum (Jacq.) Dugand, in a temperature and precipitation gradient in Colombia, because in the country are predicted scenarios of climate change that alter the behavior of these variables, impacting the country's ecosystems, as the case of the Tropical dry forest, being one of the most threatened ecosystems in our country. The measurement of anatomical wood traits was made through histological lamellae, accompanied by the measurement of traits from the maceration process carried out through different methodologies suggested by different authors, with respect to the data analysis, mixed models were used in the R software. The response in the anatomical wood traits of the three (3) species studied were slightly representative in the temperature and precipitation gradient, it was obtained a variation of two (2) traits in the temperature gradient and four (4) traits In the precipitation gradient for Astronium graveolens, one (1) trait in the temperature gradient for Platymiscium pinnatum, and Enterolobium cyclocarpum did not show any variation of the ten (10) measured traits. It was found greater variation of traits associated whit hydraulic transport oriented to the hidraulic security in drought conditions, however, the present variations of the study gradients were only manifested in the anatomical traits of Astronium graveolens, contrary to species Enterolobium cyclocarpum and Platymiscium pinnatum that do not present the adaptation to the drought conditions, determining a greater vulnerability of the species by not responding to environmental variations.