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Diversidad Florística De Especies No Arbóreas De La Escalera, Estado Bolívar, Venezuela Yuribia Vivas A., Omaira Hokche D., Silvia Pérez C

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Diversidad Florística De Especies No Arbóreas De La Escalera, Estado Bolívar, Venezuela Yuribia Vivas A., Omaira Hokche D., Silvia Pérez C ISSN 1698 - 7418 FARAUTE Ciens. y Tec., 5(1): 74-88, 2010 Depósito Legal PP200402CA1617 Yuribia Vivas A., Omaira Hokche D., Silvia Pérez C. y Alix Amaya W. DIVERSIDAD FLORÍSTICA DE ESPECIES NO ARBÓREAS DE LA 1. Introducción presencia de especies como Brocchinia micrantha ESCALERA, ESTADO BOLÍVAR, VENEZUELA (Bromeliaceae), endémica de la Guayana, que sólo Se han realizado numerosos trabajos sobre la ha sido colectada en la Escalera (Holst, 1997), así flora al sur del Venezuela (Steyermark, 1979; como en la abundancia de orquídeas y helechos. Floristic diversity of no tree species in La Escalera, Bolívar State, Venezuela Steyermark et al., 1995; Aymard et al., 1997; Salas et al., 1997; Hernández, 1999; Durán, 2001; El análisis florístico realizado en la región YURIBIA VIVAS A., OMAIRA HOKCHE D., SILVIA PÉREZ C. y ALIX AMAYA W. Blanco, 2002; Steyermark et al., 2005), no hasta el presente se ha enfocado, principalmente, en Fundación Instituto Botánico de Venezuela, Jardín Botánico de Caracas, Apdo. Postal 2156 obstante, existen algunas áreas inexploradas o cuyo elementos dendrológicos, haciéndose necesario Caracas 1010-A, Venezuela conocimiento florístico aun es insuficiente. abordar el estudio del componente no arbóreo. Así, {yuribia.vivas, omaira.hokche, silvia.perez, alix.amaya}@ucv.ve el desarrollo de inventarios florísticos en La En Sierra de Lema, como en la mayoría de las Escalera con énfasis en las especies herbáceo- Fecha de Recepción: 30/04/2010, Fecha de Revisión: 25/02/2011, Fecha de Aceptación: 08/06/2011 regiones de la Guayana, se han realizado arbustivas permitirá complementar el conocimiento exploraciones botánicas; sin embargo, la de la diversidad de este importante sector y ampliar información florística disponible es incompleta. los rangos de distribución altitudinal y geográfico Algunas expediciones botánicas se han efectuado de las especies, lo que será de utilidad para análisis Resumen en la periferia de dicha sierra (Steyermark & fitogeográficos, ecológicos y de conservación de Nilsson, 1962; Steyermark, 1966; Huber, 1995). En estos bosques, y además para otras disciplinas Se presentan los resultados del trabajo de investigación de especies herbáceas y arbustivas, realizado en el sector La Escalera muchas de las especies de asociadas a la fitodiversidad. bosques del sector oriental de La Escalera, estado Bolívar, Venezuela, ubicados desde 200 hasta 1440 m árboles, arbustos y hierbas han sido señaladas en la snm. El análisis florístico preliminar indica la presencia de 491 taxones, siendo la familia Orchidaceae la obra Flora of the Venezuelan Guayana (Steyermark Investigaciones realizadas recientemente más diversa con 55 géneros y 168 especies, seguida de Rubiaceae (23 y 33), Melastomataceae (16 y 30), et al., 1995-2005), pero la información publicada es han permitido determinar la presencia de al menos Poaceae (18 y 23), Bromeliaceae (11 y 20) y Cyperaceae (11 y 17). Se encontraron 76 nuevos registros de escasa y no se dispone de una lista de especies de 240 especies arbóreas en La Escalera, unas 25 especies para La Escalera, 33 especies (7%) endémicas para Venezuela, de las cuales 23 (5%) sólo se han dicho sector. especies de Lauraceae para los bosques reportado para el estado Bolívar. El 63% de las especies endémicas estudiadas pertenece a las familias premontanos por encima de 1000 m snm, cinco Orchidaceae (45%) y Rubiaceae (18%); dos especies de orquídeas son catalogadas con estado de La mayoría de los estudios en la Sierra de especies nuevas para la Ciencia (Hernández, 2005; conservación vulnerable. Lema se han enfocado principalmente a aspectos Sanoja et al., 2006; Holst & Vivas, 2009; Sanoja, Palabras clave: Diversidad, Endemismo, Florística, La Escalera ecológicos donde el componente arbóreo es el más com. pers.) y varios registros nuevos (Feuillet & explorado (Hernández, 1994; Rosales et al., 1997; Vanderplank, 2009; Sanoja, com. pers.). Esto pone Ortiz, 2002; Hernández & Ortiz, 2004; Hernández en evidencia la necesidad de llevar a cabo & Castellanos, 2006; Ortiz et al., 2006). Las expediciones que involucren actividades más investigaciones florísticas se han traducido en la intensivas de recolección de material vegetal en el Abstract descripción y publicación de nuevas especies sector, por lo tanto se planteó en el presente trabajo arbóreas para la ciencia (Sanoja, 2004). inventariar las especies de arbustos y hierbas de los The results of research work of herb and shrub species conducted in the forests of the eastern sector of La bosques del sector oriental de La Escalera, Sierra de Escalera, Bolívar State, Venezuela, at altitudes ranging from 200 to 1440 m asl are presented. Preliminary La presencia de ecosistemas boscosos Lema, estado Bolívar, Venezuela. floristic analysis indicates the presence of 491 taxa, Orchidaceae family is the most diverse with 59 genera florísticamente ricos y ecológicamente complejos and 168 species, followed by Rubiaceae (23 and 33), Melastomataceae (16 and 30), Poaceae (18 and 23), en La Escalera ha permitido el establecimiento y la 2. Área de estudio Bromeliaceae (11 and 20) and Cyperaceae (11 and 17). Seventy six new records for La Escalera were diversificación de comunidades de mamíferos, found, thirty-five 33 species (7%) endemic to the country were found, of which 23 (5%) were only reported reptiles, anfibios y aves (Huber et al., 2000); estas El sector La Escalera se encuentra localizado for Bolívar State. 63% of endemic species studied belong to the families Orchidaceae (45%) and Rubiaceae últimas han llamado la atención de observadores entre los kilómetros 715 y 861 (anteriormente 90 y (18%); two species of orchids are scheduled to vulnerable conservation status. por lo que, desde hace algunos años, esta zona se ha 136) de la carretera El Dorado-Santa Elena de convertido en un destino frecuente para su Uairén, estado Bolívar. Forma parte de la Sierra de Keywords: Diversity, Endemism, Floristic, La Escalera contemplación. La importancia florística de este Lema, y se ubica aproximadamente entre 5º08´- sector se puede evidenciar, entre otras, por la 6º10´ Lat. N y 61º23´- 61º25´ Long. O. 74 FARAUTE Ciens. y Tec., 5(2). 2010 75 ISSN 1698 - 7418 FARAUTE Ciens. y Tec., 5(1): 74-88, 2010 Depósito Legal PP200402CA1617 Yuribia Vivas A., Omaira Hokche D., Silvia Pérez C. y Alix Amaya W. DIVERSIDAD FLORÍSTICA DE ESPECIES NO ARBÓREAS DE LA 1. Introducción presencia de especies como Brocchinia micrantha ESCALERA, ESTADO BOLÍVAR, VENEZUELA (Bromeliaceae), endémica de la Guayana, que sólo Se han realizado numerosos trabajos sobre la ha sido colectada en la Escalera (Holst, 1997), así flora al sur del Venezuela (Steyermark, 1979; como en la abundancia de orquídeas y helechos. Floristic diversity of no tree species in La Escalera, Bolívar State, Venezuela Steyermark et al., 1995; Aymard et al., 1997; Salas et al., 1997; Hernández, 1999; Durán, 2001; El análisis florístico realizado en la región YURIBIA VIVAS A., OMAIRA HOKCHE D., SILVIA PÉREZ C. y ALIX AMAYA W. Blanco, 2002; Steyermark et al., 2005), no hasta el presente se ha enfocado, principalmente, en Fundación Instituto Botánico de Venezuela, Jardín Botánico de Caracas, Apdo. Postal 2156 obstante, existen algunas áreas inexploradas o cuyo elementos dendrológicos, haciéndose necesario Caracas 1010-A, Venezuela conocimiento florístico aun es insuficiente. abordar el estudio del componente no arbóreo. Así, {yuribia.vivas, omaira.hokche, silvia.perez, alix.amaya}@ucv.ve el desarrollo de inventarios florísticos en La En Sierra de Lema, como en la mayoría de las Escalera con énfasis en las especies herbáceo- Fecha de Recepción: 30/04/2010, Fecha de Revisión: 25/02/2011, Fecha de Aceptación: 08/06/2011 regiones de la Guayana, se han realizado arbustivas permitirá complementar el conocimiento exploraciones botánicas; sin embargo, la de la diversidad de este importante sector y ampliar información florística disponible es incompleta. los rangos de distribución altitudinal y geográfico Algunas expediciones botánicas se han efectuado de las especies, lo que será de utilidad para análisis Resumen en la periferia de dicha sierra (Steyermark & fitogeográficos, ecológicos y de conservación de Nilsson, 1962; Steyermark, 1966; Huber, 1995). En estos bosques, y además para otras disciplinas Se presentan los resultados del trabajo de investigación de especies herbáceas y arbustivas, realizado en el sector La Escalera muchas de las especies de asociadas a la fitodiversidad. bosques del sector oriental de La Escalera, estado Bolívar, Venezuela, ubicados desde 200 hasta 1440 m árboles, arbustos y hierbas han sido señaladas en la snm. El análisis florístico preliminar indica la presencia de 491 taxones, siendo la familia Orchidaceae la obra Flora of the Venezuelan Guayana (Steyermark Investigaciones realizadas recientemente más diversa con 55 géneros y 168 especies, seguida de Rubiaceae (23 y 33), Melastomataceae (16 y 30), et al., 1995-2005), pero la información publicada es han permitido determinar la presencia de al menos Poaceae (18 y 23), Bromeliaceae (11 y 20) y Cyperaceae (11 y 17). Se encontraron 76 nuevos registros de escasa y no se dispone de una lista de especies de 240 especies arbóreas en La Escalera, unas 25 especies para La Escalera, 33 especies (7%) endémicas para Venezuela, de las cuales 23 (5%) sólo se han dicho sector. especies de Lauraceae para los bosques reportado para el estado Bolívar. El 63% de las especies endémicas estudiadas pertenece a las familias premontanos por encima de 1000 m snm, cinco Orchidaceae (45%)
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