The first, Saurauio oreophilae-Alnetum acuminatae ass. Our results lead us to propose two mixed cloud-forest associations within the class Alnetea acuminatae. We then applied multivariate analysis to classify and order the data in the matrix obtained from the frequency of the sampled plants. where carried out 36 inventories, each one in an area of 0.1 ha. We divided the study area into three altitudinal belts between 2,400 and 3,020 m a.s.l. This paper analyses the distribution of the vegetation on the volcano of San Pedro in terms of its species-richness, composition, structure and abundance, and the possible relationships between these components and the changes in elevation and orientation that occur there. We provide a base of information against which future studies can measure temporal changes in presence of species such as may accompany environmental changes resulting from human activities and/or climate change.įrom a standpoint of phytosociological research, little is known about the phytocoenosis found on the volcanoes of Central America. In addition, 16 of the 96 native species collected are known only from to the western montane departments of Guatemala and the montane regions of southern Chiapas, Mexico. saxorum, Koanophyllon coulteri, Stevia triflora, and Telanthophora cobanensis. Six more species were new records for the Departmen to f Quetzaltenango: Ageratina pichinchensis, A. Of the plants collected, Ageratina rivalis and Verbesina sousae were new species records for Guatemala. Species richness of native Asteraceae measured along an elevational gradient ranged from a low of 16 species at 3400-3542 m to a high of 68 species at 2300-2699 m, where human land use most actively affects cloud forest habitat. The most diverse genus is Ageratina (Eupatorieae, 9 species). In the present study, the Heliantheae contains the greatest number of native species (29). Combining the present survey with past collections, a total of 56 genera and 126 species of Asteraceae have been reported from Pico Zunil, five of which are naturalized Old World species. From 2003 to 2005, 46 genera and 96 species of native Asteraceae were collected on the northwestern slopes of Pico Zunil, a montane cloud forest habitat in southwestern Guatemala.
0 kommentar(er)
