Morphological variation in Puya (Bromeliaceae): an allometric study |
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Authors: | C Hornung-Leoni V Sosa |
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Institution: | (1) Instituto de Ecología, A.C., Apartado Postal 63, 91000 Xalapa, Veracruz, Mexico |
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Abstract: | A group of representative species of the genus Puya was studied to determine if there are allometric relationships between vegetative and floral parts, whether these relationships
correlate with their pollination system and if plant size is correlated with elevation and latitude. Fifty-three species representing
the morphological variation and distribution of the genus were studied. Total plant height, as well as leaf, inflorescence,
petal and sepal length were measured and these data subjected to univariate and multivariate analyses. To test for correlation
between plant size and altitudinal and latitudinal distribution, ANOVAs were performed. When the pollination system of a species
is known, additional multivariate and univariate analyses were also performed. The results indicate that the characters studied
are correlated with a size component, exhibiting positive allometry for sepal and petal length and negative allometry for
leaf length. Inflorescence length is an isometric character. There was no significant correlation between plant size and altitudinal
or latitudinal distribution. The ANOVAs show that the only character correlated to pollinator type was petal length. Small
plants with small flowers are correlated to pollinators such as insects, while medium to large plants with medium to large-sized
flowers are correlated with pollinators such as birds and bats. Large plants have small flowers, that are more evident and
attract more pollinators. |
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Keywords: | Allometry altitudinal and latitudinal distribution Bromeliaceae plant size pollination system Puya |
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