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Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
Provedor de dados: Revista Chilena de Historia Natural
Autores: MÁRQUEZ,EDJULY J.; FARIÑAS,MARIO R.; BRICEÑO,BENITO; RADA,FERMÍN J.
In Venezuelan paramos grasses, after Asteraceae, are the second family in numerical importance. We studied their distribution in an altitudinal gradient located in Venezuela, Sierra de La Culata, between 2,500 and 4,200 m of altitude. Twenty one 32 m parallel line transects every 50 m were placed along the gradient, perpendicular to the main slope. Each line was divided into contiguous 50 x 50 cm sampling units. Grass species occurrence inside each sample unit was considered to determine their frequency in each line or altitude. The peak and altitudinal amplitude was determined through the weighted averaging method. A total of 47 grass species were found along the gradient. Agrostis was the best-represented genus in the gradient. Considering the...
Tipo: Journal article
Palavras-chave: Altitudinal patterns; Phytogeography; Poaceae; South American Andes; Tropical high mountain.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400008