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Distribution Patterns of Paramo Plants in Ecuador

P. Sklenar and P. M. Jorgensen
Journal of Biogeography
Vol. 26, No. 4 (Jul., 1999), pp. 681-691
Published by: Wiley
Stable URL: http://www.jstor.org/stable/2656172
Page Count: 11
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Distribution Patterns of Paramo Plants in Ecuador
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Abstract

We will analyse the geographical and vertical distributions of Ecuadorian high páramo plants. Lists of species were prepared for six Ecuadorian mountains, and floristic relationships among them were expressed by means of Sørensen's index of similarity. A mantel test was employed to analyse the pattern of geographical distribution of the species to see if the distance between the mountains was sufficient to explain the differences discovered. Altitudinal range and mean altitude of species occurrence were tested against the number of mountains from which the species were recorded using a Kruskal-Wallis nonparametric test. We found that distance as a single factor can not fully explain the pattern of floristic similarity shared by the mountains. Other important factors are involved. Altitudinal range of the species examined was positively correlated with their distribution in Ecuador. Species with a broad altitudinal occurrence were found on several mountains, whereas species with narrow altitudinal distribution were found on fewer mountains.

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