La vegetación de las lajas en la región de Lomerío, Santa Cruz, Bolivia

AUTOR(ES)
FONTE

Acta Amaz.

DATA DE PUBLICAÇÃO

2001-03

RESUMO

Plant species richness and composition was studied on three rock outcrops (lajas) in a tropical dry forest in Lomerio, Bolivia. The variation in vegetation was determined from the center to the periphery of the influence of the rock outcrops and plant species indicators of rock outcrop habitats were identified. Species richness varied among lajas, but was higher in rock outcrop habitats compared to adjoining forests. Species richness was highest on the periphery of the rock outcrops compared to the vegetated islands on the center of the outcrop. The highest species richness was encountered 10 m from the vegetated border on the periphery of the pure rock surface. Deuterocohnia meziana Kuntze ex Mez was the most dominant (highest ground cover) plant species colonizing the center of the rock outcrops, while D. meziana and Monvillea kroenleinii R. Kiesling were the most abundant. On the periphery of the laja Anthurium plowmanii Croat, Pseudananas sagenarius (Arruda) Camargo, Urera baccifera L., Casearia gossypiosperma Briq., Aspidosperma rigidum Rusby and Cereus tacuaralensis Cárdenas were the most dominant species. Regeneration appears to be occurring for the principal tree species. Lajas are key habitats that should be considered in the natural management of forests in which they are imbedded. They constitute areas of high biodiversity and endemic species and are refuges and feeding areas for many animal species.

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