Forests Amazonias seek answers by drought

The Amazon basin has experienced a more variable climate over the past decade, with severe and widespread drought in 2005 causing great losses of biomass throughout the basin. A climatological drought of similar magnitude occurred again in 2010; However, there has been a ground assessment of the entire basin based on the effects on vegetation. We examine to what extent the 2010 drought affected forest dynamics using ground observations of mortality and growth of an extensive network of forest plots. We find that during the interval of the 2010 drought, forest biomass not win regardless of whether forests experienced anomalies in the precipitation deficit. The net impact of biomass was driven by increased mortality and decreased productivity. Surprisingly, the magnitude of losses tree mortality was not related to anomalies local precipitation estimated and was independent of local droughts estimated pre 2010. Therefore, there was no evidence that droughts pre the 2010 aggravated the effects the drought of 2010. we have seen an impact throughout the basin systematic drought of 2010 on growth rates of trees through the Amazon, which are related to the strength of moisture deficit. On the basis of these data in the field, living biomass in trees and corresponding estimates of the living biomass in lianas and roots, it is estimated that the virgin forests of the Amazon were carbon neutral in 2010 in line with the results of an independent analysis of estimates of flows of air at atmospheric during 2010.

Los bosques del amazonas

Los Bosques de Amazonias buscan respuestas por la sequía.

Ver Más


Exploring palm-insect interactions across geographical and environmental gradients

Mutualistic relationships, such as plant-pollinator interactions, have been suggested to drive ecological divergence(Ehrlich & Raven, 1964; Thompson & Cunningham, 2002; Weiblen & Bush, 2002; Thompson, 2005; Whittall & Hodges, 2007). Therefore, it is likely that plant reproductive isolation is closely related to pollination biology and differences in pollinator distribution and plant-pollinator specificity may contribute to population differentiation and coevolution and even drive speciation.

Insects are the predominant pollinators across flowering plants and therefore plant-insect interaction is expected to be an important evolutionary factor in most clades across the angiosperm phylogeny (Farrell; Mitter & Futuyma, 1992.)Classic examples of plant-insect coevolution are found throughout the plant tree of life and include yucca moths and Yucca L. (e.g. Wiebes, 1979) and ants and Acacia Mill.(Janzen, 1966).These studies have shown that high pollinator specificity results in high species turnover between host plants (here defined as visited or pollinated plant individuals), although plant-insect coevolution is diffuse when pollinator species use several host plants.


Exploring palm-insect interactions across geographical and environmental gradients

Ver Más


Veredal mammals Road Angelópolis

By: Carlos Arturo Cuartas-calle

Area of ​​study : The study was conducted in the town of Angelopolis in veredal path of the aqueduct, between the gorges Las Animas and La Ramirez. The municipality is , according to the political division of the department of Antioquia, in the southwest subrregión ; and according to the division CORANTIOQUIA in South dubrregión Aburrá . The place is located in the living area submontane wet forest ( BMH -SM ) , has a height of 1850-1900 m.s.n.m. , with coordinates 06 ° 06'48 " N latitude and 75 ° 43'02 " Length O.

The sector is characterized by permanent fog, abundant sources of clean, clear water, and the forest is in some secondary sectors early- and late- succession, while in the blades and slopes has a structure of primary forest little intervenidoy with seral states climáxicos in less accessible sites.


Mamíferos del Camino Veredal de Angelópolis

Ver Más