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Long-Distance Dispersal, Isolation, and the Cloud Forest Flora of the Serrania de Macuira, Guajira, Colombia

Andrew M. Sugden
Biotropica
Vol. 14, No. 3 (Sep., 1982), pp. 208-219
DOI: 10.2307/2388027
Stable URL: http://www.jstor.org/stable/2388027
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Long-Distance Dispersal, Isolation, and the Cloud Forest Flora of the Serrania de Macuira, Guajira, Colombia
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Abstract

The Serrania de Macuira (865 m) is a small mountain range rising from the arid lowlands of the Guajira peninsula on the Caribbean coast of Colombia. It supports on its summits a cloud forest which is isolated from the nearest extensive moist area by at least 250 km. Palaeoclimatic and geological evidence indicates that the cloud forest is of recent origin and has never been connected to other moist regions. Hardly any of the 126 species of vascular plants in the cloud forest are found in the surrounding dry lowlands, and it is suggested that long-distance dispersal accounts for their presence in the Serrania de Macuira. Forty-one percent of the flora is adapted for internal dispersal by birds, 39 percent for wind dispersal, and 5 percent for external carriage by birds (or mammals) A small percentage show no obvious adaptations for dispersal, but these nevertheless have small propagules and in some cases may have been accidentally introduced by man.

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