Resumo

BELLO PULIDO, Jesús; VELASQUEZ ARENAS, Roger; ACOSTA, Vanessa  e  MARCHAN, Claudio. Florula, identification key and community structure of the angiosperms presents in isla larga, Mochima national park, Sucre state, Venezuela. Saber [online]. 2014, vol.26, n.3, pp.249-264. ISSN 1315-0162.

Mochima National Park comprises a group of islands, as well as a mountainous area that has been well documented from the floristic point of view, registering1124 species of angiosperms. However, the limited knowledge of the vascular flora of the island area, was proposed as the objective of describing the flora and community structure of Isla Larga. A set of 28 quadrats of 100 m2 was established, and all individuals within them were measured, identified and quantified, and ecological indices were determined. A total of 2.225 individuals were registered, distributed in 59 species of angiosperms, including 54 genera belonging to 33 families. The best represented families were Euphorbiaceae (9 spp.), Cactaceae (5 spp.), Poaceae (5 spp.) and Mimosaceae (4 spp.) which accounted for 38.98% of the total number of species in the area. The diversity was 2.84 bits/inds; however, evenness was low 0.59 reflecting an inequitable distribution of species in the area. The highest value of importance value index (IVI), was for Rhizophora mangle (262,78), Croton pungens (172,82), Caesalpinia coriaria (139.36) and Opuntia caracassana (125.45). The dominance of these species may be related to the morpho-anatomical changes developed in these species to survive in the environmental conditions of the area, which allowed them to adapt more effectively than other species. Furthermore, they are species characteristic of the types of vegetation present in the area (tropophyle and mangrove forests).

Palavras-chave : Tropophyle forest; mangrove forest; community structure; angiosperms.

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