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Floristic Diversity and Structure of Upland and Arroyo Forests of Coastal Jalisco
Emily J. Lott, Stephen H. Bullock and J. Arturo Solis-Magallanes
Vol. 19, No. 3 (Sep., 1987), pp. 228-235
Published by: Association for Tropical Biology and Conservation
Stable URL: http://www.jstor.org/stable/2388340
Page Count: 8
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The species richness at Chamela, Jalisco (average annual rainfall 748 mm, with a 4-month wet season), exceeded that of other Neotropical dry forests with more than twice its annual rainfall. Transect samples totaling 0.3 ha included 176 species and 1352 plants $\geq$2.5 cm DBH. The mean number of species per 100-m$^2$ transect was 22.7 Upland and arroyo sites were similar in species number, but the latter included greater percentages of species of vines (11% vs 21%) and trees $\geq$10 cm DBH (24% vs 31%). The only species that were both common and ubiquitous were Trichilia trifolia. Caesalpinia eriostachys, and Cordia alliodora. Upland sites were typified by species of Croton, Lonchocarpus, and Cordia, and arroyo sites were typified by Thouinidium decandrum and a variety of vines. Families with the most species were Leguminosae, Euphorbiaceae, Rubiaceae, and Bignoniaceae. Total basal area averaged 0.24 m$^2$/100 m$^2$ in uplands but 0.52 m$^2$/100 m$^2$ in arroyos; most of the difference was due to trees $\geq$30 cm DBH. In all sites, over 50 percent of the stems were <5 cm DBH, but vines and large trees were more abundant in arroyos. Stem densities averaged about 45/100 m$^2$ in both sites.
Biotropica © 1987 Association for Tropical Biology and Conservation