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Demography, and genetic and morphological variability of the endangered Sophronitis sincorana (Orchidaceae) in the Chapada Diamantina, Brazil

E. L. Borba, R. R. Funch, P. L. Ribeiro, E. C. Smidt and V. Silva-Pereira
Plant Systematics and Evolution
Vol. 267, No. 1/4 (2007), pp. 129-146
Published by: Springer
Stable URL: http://www.jstor.org/stable/23655717
Page Count: 18
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Demography, and genetic and morphological variability of the endangered Sophronitis sincorana (Orchidaceae) in the Chapada Diamantina, Brazil
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Abstract

We carried out a demographic study and evaluated the genetic and morphological variability in five populations of the endangered Sophronitis sincorana (Orchidaceae) endemic to Northeastern Brazil, based on allozyme and morphometric analyses. Plant density was approximately 0.5 plants/m2, and the projected total number of plants was approximately 50,000 individuals. However, fruit set and recruitment of individuals are rare. The genetic variability was very high in all populations (P = 100, A = 3.0—3.5, He = 0.33—0.48), and all populations presented similar values of morphological variability. Low genetic and morphological structuring were found in the species (FST = 0.053, AMRPP = 0.018). The elevated coefficient of endogamy encountered in populations of S. sincorana indicates the occurrence of structuring within the populations. The lack of correlation between morphological and genetic variation in this species indicates that none of the markers examined should be used separately for either conservation purposes.

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