Distribution of grasses along an altitudinal gradient in a Venezuelan paramo

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 al...

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Autores principales:	MÁRQUEZ,EDJULY J., FARIÑAS,MARIO R., BRICEÑO,BENITO, RADA,FERMÍN J.
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2004
Materias:	altitudinal patterns phytogeography Poaceae South American Andes tropical high mountain
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400008
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spelling	oai:scielo:S0716-078X20040004000082005-04-22Distribution of grasses along an altitudinal gradient in a Venezuelan paramoMÁRQUEZ,EDJULY J.FARIÑAS,MARIO R.BRICEÑO,BENITORADA,FERMÍN J. altitudinal patterns phytogeography Poaceae South American Andes tropical high mountain 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 distribution ranges, we assume that there are different biotic and abiotic processes determining the distribution patterns. The species occurring at the highest altitudes were temperate elements, while those in the lowest areas were tropical and subtropical elements. Seven species in the gradient are endemic to the Venezuelan paramos. Grass distribution patterns in the paramo may be related to phytogeographical origin. In order to better understand the plant altitudinal distribution pattern is necessary to consider the plant responses to low temperatures, high incoming radiation, water stress and slope aspectinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.77 n.4 20042004-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400008en10.4067/S0716-078X2004000400008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	altitudinal patterns phytogeography Poaceae South American Andes tropical high mountain
spellingShingle	altitudinal patterns phytogeography Poaceae South American Andes tropical high mountain MÁRQUEZ,EDJULY J. FARIÑAS,MARIO R. BRICEÑO,BENITO RADA,FERMÍN J. Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
description	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 distribution ranges, we assume that there are different biotic and abiotic processes determining the distribution patterns. The species occurring at the highest altitudes were temperate elements, while those in the lowest areas were tropical and subtropical elements. Seven species in the gradient are endemic to the Venezuelan paramos. Grass distribution patterns in the paramo may be related to phytogeographical origin. In order to better understand the plant altitudinal distribution pattern is necessary to consider the plant responses to low temperatures, high incoming radiation, water stress and slope aspect
author	MÁRQUEZ,EDJULY J. FARIÑAS,MARIO R. BRICEÑO,BENITO RADA,FERMÍN J.
author_facet	MÁRQUEZ,EDJULY J. FARIÑAS,MARIO R. BRICEÑO,BENITO RADA,FERMÍN J.
author_sort	MÁRQUEZ,EDJULY J.
title	Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
title_short	Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
title_full	Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
title_fullStr	Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
title_full_unstemmed	Distribution of grasses along an altitudinal gradient in a Venezuelan paramo
title_sort	distribution of grasses along an altitudinal gradient in a venezuelan paramo
publisher	Sociedad de Biología de Chile
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000400008
work_keys_str_mv	AT marquezedjulyj distributionofgrassesalonganaltitudinalgradientinavenezuelanparamo AT farinasmarior distributionofgrassesalonganaltitudinalgradientinavenezuelanparamo AT bricenobenito distributionofgrassesalonganaltitudinalgradientinavenezuelanparamo AT radaferminj distributionofgrassesalonganaltitudinalgradientinavenezuelanparamo
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Distribution of grasses along an altitudinal gradient in a Venezuelan paramo

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