Precipitación Media Mensual en Costa Rica, Octubre

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de precipitaciones media mensual en Octubre.

Precipitación Media Mensual en Costa Rica, Noviembre

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de precipitaciones media mensual en Noviembre.

Precipitación Media Mensual en Costa Rica, Diciembre

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de precipitaciones media mensual en Diciembre.

Promedio de días con lluvia en Costa Rica, Marzo

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de isoyetas del promedio de días con lluvia, en Marzo.

Promedio de días con lluvia en Costa Rica, Abril

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de isoyetas del promedio de días con lluvia, en Abril.

Promedio de días con lluvia en Costa Rica, Mayo

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de isoyetas del promedio de días con lluvia, en Mayo.

Promedio de días con lluvia en Costa Rica, Junio

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de isoyetas del promedio de días con lluvia, en Junio.

Promedio de días con lluvia en Costa Rica, Julio

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de isoyetas del promedio de días con lluvia, en Julio.

Promedio de días con lluvia en Costa Rica, Agosto

Mapa perteneciente al Atlas Climático de Costa Rica y corresponde a un mapa de isoyetas del promedio de días con lluvia, en Agosto.

Tipos de influencia según ubicación de sistemas o ciclones tropicales para Costa Rica.

Mapa de ubicación de amenazas naturales, con el objetivo de apoyar el proceso de prevención y mitigación de riesgo y desastres naturales en Costa Rica.

Novas espécies de Desmiphorini (Coleoptera, Cerambycidae, Lamiinae) da Costa Rica e do Equador

Novas espécies são descritas: Eupogonius lateralis sp. nov., Estola nigrodorsalis sp. nov., Pseudestoloides rubiginosa sp. nov de Heredia (Costa Rica); Pseudestoloides affinis sp. nov. de Guanacaste and Puntarenas (Costa Rica); Mimopogonius hovorei sp. nov. de Azuay (Equador).

Novos táxons de Desmiphorini (Coleoptera, Cerambycidae, Lamiinae) da Costa Rica e do Brasil

Novos táxons descritos: Estola acrensis sp. nov. do Acre (Brasil), Eupogonius brevifascia sp. nov. de Guanacaste (Costa Rica) e Disgregus gen. nov., espécie-tipo, D. bezarki sp. nov. de Guanacaste (Costa Rica).

Variation in the wood anatomical structure of Gmelina arborea (Verbenaceae) trees at different ecological conditions in Costa Rica

The tree Gmelina arborea has been widely introduced in Costa Rica for commercial purposes. This new conditions for melina cause variations on anatomy in secondary xylem of the trees growing in plantations. The objective of the present research was to determine the variation in the anatomy of xylem caused by the ecological conduction variation. Dimensions of fiber, axial parenchyma percentage of cross sections, parameters of vessels and the ray were measured. The results showed that some anatomical characteristics remained stable despite variations of ecological conditions, especially radial parenchyma and anatomical features which were less affected by the altitude. On the other hand, the vessels, axial parenchyma and fiber were less stable because they were affected significantly by the longitude, latitude, altitude and precipitation. Latitude significantly affected vessel percentage, length and diameter of the fiber and lumen. Longitude affected vessel percentage and fiber diameter. Altitude had a significant correlation with the amount of cells at my height. Annual average precipitation affected vessel percentage and diameter, not only of the fiber, but also of the lumen. These results suggest that the new growth conditions of G. arborea trees in Costa Rica have produced an anatomic adaptation.

Radial variation of anatomical features, wood density and decay resistance in teak (Tectona grandis) from two qualities of growing sites and two climatic regions of Costa Rica

The objective of this study was to show the radial variation of some anatomic characteristics, wood density and natural durability of teak (Tectona grandis L.F.) growing in Costa Rica. Samples of trees 13 years old were obtained from two growing sites (high and low growing) of plantations established in a humid tropical climate (CHT) and dry tropical climate (CST). The variables measured of the fibers as well as for the rays were not affected by the climate or the type of growing site, except for the length of the fibers. The fibers of teak wood from the best growing site were significantly larger. Vessels were found with a greater frequency for the CST but mostly solitary in comparison with the CBT. Average density, maximum density and the variation within the ring presented a light higher magnitude for the CST. The quality of the growing site did not affect these variables. The resistance of fungus attack was similar in the area of heartwood near the pith compared to the heartwood near the sapwood for all the conditions evaluated. Nevertheless, it was observed in some trees a similar resistance of fungus attack for areas of sapwood compared to similar areas of heartwood.

Radial variation of the wood anatomical structure of Gmelina arborea trees from different climatic and management conditions in Costa Rica

The evaluations of the effect of the climatic conditions and of the intensity of forest management in the trunk of the Gmelina arborea Linn. Roxb. trees are restricted to its physical-mechanical properties and use. The present work has as objective to study the radial variations of the wood anatomy of the gmelina trees sampled in plantations of 30 sites in Costa Rica, characterized by two climatic conditions (tropical dry and humid) and three intensities of forest management (intensive, moderate and without management). The results of the analyses demonstrated the existence of radial variation of the different anatomical parameters, except for the fiber lumen diameter and multiple vessels in the wood of the gmelina trees. For the wood anatomical elements, fibers (width, lumen diameter, and length), vessels (multiple vessels, diameter and frequency) and radial parenchyma (height) relationships were observed with the climate (tropical humid and dry). The radial variations of the wood anatomical elements were, also, influenced by the management regimes of the gmelina trees.