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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad de Costa Rica
2015
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| Online Access: | https://www.redalyc.org/articulo.oa?id=44939781022 https://www.redalyc.org/journal/449/44939781022/ https://www.redalyc.org/journal/449/44939781022/html/ https://www.redalyc.org/journal/449/44939781022/44939781022.epub https://www.redalyc.org/journal/449/44939781022/movil |
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Table of Contents:
- Floristic similarity and dispersal syndromes in a rocky outcrop in semi-arid Northeastern Brazil Elainne Cristina Silva Costa Sérgio de Faria Lopes José Iranildo Miranda de Melo Biología diasporas Inselbergs South America xeric corridor floristic similarity Floristic studies provide valuable information on species richness in a region, and are particularlyimportant if these areas belong to less studied environments, such as rocky outcrops, that may increase ourknowledge. An important aspect for species colonization includes the mechanisms of diaspores dispersal ineach community; these are essential to understand its structure, dynamics, and the regeneration process, andconstitute an important tool for conservation. We developed a floristic survey on a granite-gneiss outcrop withthe objective to increase the knowledge on plant diversity, through a floristic similarity analysis and detectionof dispersal syndromes of sampled species, in a semi-arid region of Brazil. The fieldwork included collectionand observation of the botanical materialin locoduring a period of 12 months. A total of 161 species belongingto 127 genera and 50 families of angiosperms were recorded. Fabaceae, Asteraceae and Convolvulaceae werethe most representative families in number of species.Allophylus quercifolius(Mart.) Radlk. (Capparaceae)andLafoensia pacariA. St.-Hil. (Lythraceae) represented new records for the State of Paraíba. The autochoricsyndrome was the most representative, with 51.5 % of the recorded species; the anemochory was the secondmost representative syndrome with 26.7 % of the species; and finally the zoochory, representing 22.3 % of thespecies. The floristic similarity dendrogram showed the formation of three well-defined groups, whose areawith the highest value (J = 33.2) is located in a Caatinga region called Cariri Paraibano, while the lowest valueobserved (J = 5.2), occurred in a settled area in two geomorphological units, a crystalline complex and a plateauregion. These results may be due to the varying topographic conditions and edaphic heterogeneity arising fromthe specific geological formation of the region. These results yet demonstrate that, in rocky outcrops, abioticsyndromes represent an effective dispersion of its diaspores, favoring plant specie’s colonization dynamics. Rev.Biol. Trop. 63 (3): 827-843. Epub 2015 September 01. 2015 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44939781022 https://www.redalyc.org/journal/449/44939781022/ https://www.redalyc.org/journal/449/44939781022/html/ https://www.redalyc.org/journal/449/44939781022/44939781022.epub https://www.redalyc.org/journal/449/44939781022/movil en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.3 Vol.63