COMPOSICION Y ESTRUCTURA DE UN IGAPO ECUATORIANO

Abstract

The study area is located in the Yasuní National Park, in Francisco de Orellana province, Nuevo Rocafuerte County at the confluence of Yasuní River and Jatun Cochi Lagoon. The approximate coordinates are 75°27’W and 59°30‘S and 180 m elevation, and it belongs to Tropical Rain Forest life zone and Lowland evergreen forests inundated by black waters (lgap$). We did the fielwork in September 1999. We established a permanent plot of 1 Ha (100 x 100 m) and divided it into ¿5subplots of 20 x 20 m. Vé measured trees and lianas with a DBH equal to or greater than 10 cm. Wb registered phenological information and DBH of species in the plot. Based on the frequency and DBH of the species, we obtained the BasalArea and the Importance Vhlue Index (IVI) for species, genera and families. The mounted vouchers are deposited at QAP Herbarium with collection numbers 38967-39576 from the first authoR Cerón et al: Composición .vEstructura de un Igapó We registered 556 individuals, 12.9% in a reproductive stage and 87.1% in a vegetative stage. These individuals belonged to 114 species, 81 genera and  families. The total Basal Area was 39.54 m2. The more frequent species are Pouteria m ultiflora (Sapotaceae), Inga stenoptera (Mimosaceae), and Astrocaryum jauarl(Arecaceae), the most frequent genera were Pouteria, Inga and Virola, and the most frequent families were Mimosaceae, Sapotaceae, and Myristicaceae. Based on the IVI, Pouteria multiflora, Virola surinamensis(Myristicaceae), and Inga ruiziana (Mimosaceae) were the dominant species; Pouteria, Coussapoa and Macrolobium were the dominant genera, and Sapotaceae. Mimosaceae and Cecropiaceae were the dominant fasmilies. The plot studied registered tl lianas with a Basal Area of 0.67 m2, and the most abundant epiphytes were Anthurium clavigerum (Araceae) and Microgramma pilloselloides{Polypodiaceae). Traducción: Alina Fralro-Fierro