Relaciones fitogeográficas de las sierras y afloramientos rocosos de la Guayana colombiana: un estudio preliminar

Giraldo-Cañas, Diego

doi:10.4067/s0716-078x2001000200012

Cited by 12 publications

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“…B) which supports results from studies of Colombian white‐sand forests showing strong phytogeographic links with the Guiana Shield flora (Cortés et al . , Giraldo‐Cañas , Arbeláez & Duivenvoorden ). On the other hand, the ecoregions with the highest percentage of shared western Amazon white‐sand specialists, when using only species from loreto.wsf.PE (Peru), and acre.wsf.BT (Brazil), are located in the western Amazon (Iquitos varzea, Napo moist forests, and Southwest Amazon moist forests) (Fig.…”

Section: Discussionmentioning

confidence: 98%

Amazonian White‐Sand Forests Show Strong Floristic Links with Surrounding Oligotrophic Habitats and the Guiana Shield

2016

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Amazonian white‐sand forests occur on quartzitic sandy soils, are distributed as an archipelago of habitat islands across the rain forests of Amazonia and contain many endemic plant species. Surprisingly, we found that only 23 percent of plant species in western Amazon white‐sand forests are white‐sand specialists, while the remaining species (77%) also occur in other habitat types. Overall, our analyses revealed: (1) somewhat unexpected composition similarity of white‐sand forests with nearby non‐white‐sand forests; (2) phytogeographical connections among distant white‐sand forests; and (3) a large proportion of western Amazon white‐sand specialists occurring in floras of the western and central Guiana Shield region (7–43%). These results suggest that dispersal from both neighboring oligotrophic non‐white‐sand habitats and distant white‐sand forests is fundamental in shaping western Amazonian white‐sand forests’ species composition and diversity. Although endemism in Amazonian white‐sand forests may be lower than previously estimated, conservation of this unique and fragile environment should remain a priority. Such conservation will require the maintenance of regional dispersal processes that connect these archipelagos of habitat islands and other ecologically similar oligotrophic habitats across the Amazon and the Guiana Shield.

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Section: Discussionmentioning

confidence: 98%

Amazonian White‐Sand Forests Show Strong Floristic Links with Surrounding Oligotrophic Habitats and the Guiana Shield

2016

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“…En general, la estructura de la vegetación se caracteriza por estar conglomerada en parches dispersos sobre una matriz de suelo rocoso sin vegetación que cubre entre el 60 % y el 70 % del área. Las coberturas boscosas tienen poca cobertura (30 % -40 %) caracterizada por árboles delgados con diámetros a la altura del pecho entre 30 y 100 mm, con un dosel irregular que no supera los 8 m de altura (Giraldo-Cañas, 2001). Sin embargo, predominan herbazales y arbustales los cuales tienen alturas de hasta 2,5 m ( Barona-Colmenares et al, 2018).…”

Section: Tipos De Cobertura Y Muestreo De Murciélagosunclassified

Los Ensamblajes De Murciélagos De La Serranía De La Lindosa Son Diversos Y Heterogéneos

2020

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La Serranía de La Lindosa es una formación geomorfológica que presenta heterogeneidad en sus coberturas vegetales. Esta zona se encuentra en una situación contradictoria debido a que presenta una elevada biodiversidad, sin embargo, es uno de los actuales focos de deforestación más grandes de Colombia. A pesar de que se espera una alta diversidad de murciélagos en La Lindosa existe poca información publicada sobre este grupo. Este trabajo presenta los resultados de inventarios de murciélagos realizados durante cinco años en la serranía de la Lindosa. Se compara la diversidad (riqueza, composición y estructura) de los ensamblajes de murciélagos en dos tipos principales de cobertura vegetal, los bosques húmedos y las sabanas casmófitas. Los inventarios recogen información de 735 murciélagos capturados, correspondientes a 46 especies. De éstas, 14 especies se encontraron solamente en sabanas casmófitas, 11 en bosques húmedos y 19 en los dos tipos de vegetación. De esta manera, se evidencia una alta complementariedad en la composición de especies de murciélagos entre los dos tipos de vegetación. Adicionalmente, la estructura de los ensamblajes de murciélagos varió entre los dos ambientes. La abundancia entre las especies es más homogénea en las sabanas casmófitas con un mayor número de especies raras comparado con los bosques húmedos. En general, la alta diversidad de murciélagos de la Serranía de La Lindosa puede estar relacionada con la heterogeneidad en la vegetación, la presencia de diferentes tipos de cuevas, y la historia evolutiva de las especies de murciélagos asociados a la Región Guayana.

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“…Las afinidades florísticas del BTI de nuestra área de estudio se exploraron a través de un enfoque fenético con un análisis de conglomerados (UPGMA) mediante el coeficiente de similitud de Sorensen (Acosta, 2004;Giraldo-Cañas, 2001). Para ello se construyó una matriz de presencia-ausencia de los géneros de plantas leñosas presentes en estudios de BTI's de la península de Yucatán y del estado de Tabasco, y BTA's de la península de Yucatán (Cuadro 1).…”

Section: Análisis De Similitud Florísticaunclassified

Diversidad, estructura y afinidades florísticas de un bosque temporalmente inundable de la Península de Yucatán

Albor-Pinto

Tun‐Garrido

Ortíz-Díaz

2017

RBT

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Diversity, structure and floristic affinities of a temporarily flooded forest of the Yucatan Peninsula. Temporarily flooded forests (TFF's) are among the most endangered tree communities in Southeast Mexico and in a contradictory way among the least known in terms of their diversity. Therefore, the aim of this study was to characterize the richness, diversity (Shannon-Wiener) and dominance (relative importance value; RIV) of a TFF of the Yucatan Peninsula, and evaluate its floristic affinities with other TFF's and upland forests (UF's) of Southeast Mexico. A sampling method based on 10 quadrants of 10 x 20 m (2 000 m 2 ) was used to record all woody individuals with diameter ≥ 1 cm and height ≥ 1.5 m. A floristic similarity analysis was used including 192 genera of woody plants belonging to TFF's and UF's of the Yucatan and Tabasco TFF's. A Mantel correlation test was performed to determine if the geographic distance has effect on the floristic similarities between TFF's and UF´s of the Yucatan peninsula. The TFF under study was characterized with a low level of diversity (2.79) and species richness (56), and a high dominance level (52.3 % of RIV in five species). Dominant species such as Haematoxylum campechianum, Dalbergia glabra, Cameraria latifolia, Byrsonima crassifolia, Crescentia cujete and Terminalia buceras showed a floristic neotropical affinity typical of floodable habitats. The structure of the community was characterized by an inverted "J" pattern for the distribution of individuals in the diametric and height classes. The high density of woody lianas, mainly of Dalbergia glabra (22 % of the recorded individuals) suggested an optimal state of conservation of the studied area. The floristic similarity analysis revealed that most of TFF's in Yucatan Peninsula were grouped with high similarity (55 %) independently of the adjacent UF's; however, TFF´s resulted similar among them (36 % similarity) when compared with TFF's from other regions (16 % similarity). According to the Mantel test, the similarity between sites is not influenced by its geographical proximity (r = -0.098, p>0.05). This emphasizes the need to generate conservation strategies for the TFF's of the Yucatan peninsula independently from other regions of Southeast Mexico. Our results suggest that the TFF of the studied region has a similar diversity from other TFF's in Southeast Mexico, a different floristic composition compared with adjacent UF's and a structure with an optimal conservation status, characteristics that indicate their importance for the regional flora conservation. Further ecological studies are needed to build a solid foundation for management and conservation for the TFF's. Rev. Biol. Trop. 65 (3): 868-880. Epub 2017 September 01.

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Relaciones fitogeográficas de las sierras y afloramientos rocosos de la Guayana colombiana: un estudio preliminar

Cited by 12 publications

References 0 publications

Amazonian White‐Sand Forests Show Strong Floristic Links with Surrounding Oligotrophic Habitats and the Guiana Shield

Amazonian White‐Sand Forests Show Strong Floristic Links with Surrounding Oligotrophic Habitats and the Guiana Shield

Los Ensamblajes De Murciélagos De La Serranía De La Lindosa Son Diversos Y Heterogéneos

Diversidad, estructura y afinidades florísticas de un bosque temporalmente inundable de la Península de Yucatán

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