Structure and floristic composition of the savannahs of the Nizanda region, Isthmus of Tehuantepec (Oaxaca), Mexico
Current knowledge about savanna vegetation in Mexico is still incomplete, and it is dominated by an ongoing debate over their natural versus anthropogenic origin. In this paper we provide a detailed structural and floristic description of the savannas of the Nizanda region (Oaxaca, S Mexico). Vegeta...
| Main Authors: | , , |
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| Format: | Online |
| Language: | spa |
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Instituto de Ecología, A.C.
2006
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| Online Access: | https://abm.ojs.inecol.mx/index.php/abm/article/view/1025 |
| _version_ | 1799771267135438848 |
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| author | López-Olmedo, Liliana I. Pérez-García, Eduardo A. Meave, Jorge A. |
| author_facet | López-Olmedo, Liliana I. Pérez-García, Eduardo A. Meave, Jorge A. |
| author_sort | López-Olmedo, Liliana I. |
| collection | ABM |
| description | Current knowledge about savanna vegetation in Mexico is still incomplete, and it is dominated by an ongoing debate over their natural versus anthropogenic origin. In this paper we provide a detailed structural and floristic description of the savannas of the Nizanda region (Oaxaca, S Mexico). Vegetation was sampled in 20 sites of 15 m2 each (totaling 300 m2). A total of 135 morphospecies were encountered, 86 of which could be determined to species level; they were distributed in 29 families and 68 genera. Leguminosae, Poaceae and Asteraceae were the families with the largest taxonomic richness. Total community cover was 200.7 m2, of which 69% was accounted for by grasses and sedges. Despite a clear dominance of Trachypogon spicatus (Berger-Parker Index = 0.82), this community had a relatively large diversity (log2 Shannon Index = 3.64). Life form spectrum showed a dominance of chamaephytes and hemicryptophytes, indicating a harsh environment. Notwithstanding the widespread occurrence of secondary vegetation and ruderal species in the region, the virtual lack of exotic species in these savannas, together with the presence of some endemics and the identity of the dominant species, strongly support the primary nature of this plant community. |
| format | Online |
| id | oai:oai.abm.ojs.inecol.mx:article-1025 |
| institution | Acta Botanica Mexicana |
| language | spa |
| publishDate | 2006 |
| publisher | Instituto de Ecología, A.C. |
| record_format | ojs |
| spelling | oai:oai.abm.ojs.inecol.mx:article-10252022-12-24T04:33:43Z Structure and floristic composition of the savannahs of the Nizanda region, Isthmus of Tehuantepec (Oaxaca), Mexico Estructura y composición florística de las sabanas de la región de Nizanda, Istmo de Tehuantepec (Oaxaca), México López-Olmedo, Liliana I. Pérez-García, Eduardo A. Meave, Jorge A. Chivela floristics grassland Mexico Nizanda Oaxaca savanna Trachypogon spicatus vegetation structure Chivela estructura de la vegetación florística México Nizanda Oaxaca pastizal sabana Trachypogon spicatus Current knowledge about savanna vegetation in Mexico is still incomplete, and it is dominated by an ongoing debate over their natural versus anthropogenic origin. In this paper we provide a detailed structural and floristic description of the savannas of the Nizanda region (Oaxaca, S Mexico). Vegetation was sampled in 20 sites of 15 m2 each (totaling 300 m2). A total of 135 morphospecies were encountered, 86 of which could be determined to species level; they were distributed in 29 families and 68 genera. Leguminosae, Poaceae and Asteraceae were the families with the largest taxonomic richness. Total community cover was 200.7 m2, of which 69% was accounted for by grasses and sedges. Despite a clear dominance of Trachypogon spicatus (Berger-Parker Index = 0.82), this community had a relatively large diversity (log2 Shannon Index = 3.64). Life form spectrum showed a dominance of chamaephytes and hemicryptophytes, indicating a harsh environment. Notwithstanding the widespread occurrence of secondary vegetation and ruderal species in the region, the virtual lack of exotic species in these savannas, together with the presence of some endemics and the identity of the dominant species, strongly support the primary nature of this plant community. El conocimiento sobre la vegetación de sabana en México es aún incipiente y está marcado por un debate sobre el origen primario o antropogénico de estas comunidades. En este estudio se caracterizó la estructura y la composición florística de las sabanas de la región de Nizanda (Oaxaca, México) a partir de un muestreo realizado en 20 sitios de 15 m2 cada uno (300 m2 en total). Se encontraron 135 morfoespecies (86 determinadas a nivel de especie) distribuidas en 29 familias y 68 géneros. Las familias Leguminosae, Poaceae y Asteraceae tuvieron la mayor riqueza taxonómica. La cobertura fue de 200.7 m2, de la cual 69% correspondió a gramíneas y ciperáceas. A pesar de la clara dominancia estructural de Trachypogon spicatus (índice de Berger-Parker = 0.82), la comunidad tuvo una diversidad relativamente alta (índice de Shannon log2 = 3.64). En el espectro biológico prevalecieron las camefitas y hemicriptofitas. Si bien en la región existen áreas considerables de vegetación secundaria, la virtual ausencia de elementos exóticos en las sabanas, junto con la presencia de especies endémicas y la identidad de la planta dominante son fuertes indicios de la naturaleza primaria de esta comunidad vegetal. Instituto de Ecología, A.C. 2006-10-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion artículo evaluado por pares application/pdf https://abm.ojs.inecol.mx/index.php/abm/article/view/1025 10.21829/abm77.2006.1025 Acta Botanica Mexicana; No. 77 (2006); 41-67 Acta Botanica Mexicana; Núm. 77 (2006); 41-67 2448-7589 0187-7151 spa https://abm.ojs.inecol.mx/index.php/abm/article/view/1025/1186 Derechos de autor 2016 Acta Botanica Mexicana https://creativecommons.org/licenses/by-nc/4.0 |
| spellingShingle | López-Olmedo, Liliana I. Pérez-García, Eduardo A. Meave, Jorge A. Structure and floristic composition of the savannahs of the Nizanda region, Isthmus of Tehuantepec (Oaxaca), Mexico |
| title | Structure and floristic composition of the savannahs of the Nizanda region, Isthmus of Tehuantepec (Oaxaca), Mexico |
| title_full | Structure and floristic composition of the savannahs of the Nizanda region, Isthmus of Tehuantepec (Oaxaca), Mexico |
| title_fullStr | Structure and floristic composition of the savannahs of the Nizanda region, Isthmus of Tehuantepec (Oaxaca), Mexico |
| title_full_unstemmed | Structure and floristic composition of the savannahs of the Nizanda region, Isthmus of Tehuantepec (Oaxaca), Mexico |
| title_short | Structure and floristic composition of the savannahs of the Nizanda region, Isthmus of Tehuantepec (Oaxaca), Mexico |
| title_sort | structure and floristic composition of the savannahs of the nizanda region, isthmus of tehuantepec (oaxaca), mexico |
| url | https://abm.ojs.inecol.mx/index.php/abm/article/view/1025 |
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