Diversity and morphological disparity of desmid assemblages in Central European peatlands |
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Authors: | Ji?í Neustupa Kate?ina ?erná Jan ?t’astný |
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Institution: | (1) Faculty of Science, Department of Botany, Charles University of Prague, Benátská 2, 128 01 Praha, Czech Republic |
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Abstract: | Morphological disparity has increasingly been used as an alternative measure of biological diversity based on the shape features
of organisms. In this study, we investigated the species diversity and morphological disparity of benthic Desmidiales in Central
European peatland pools. The shape features of cells were determined using the 3-D elliptical Fourier analysis of their frontal
and lateral views. The resulting morphospace was used to calculate the contributions of localities and species to the morphological
variation. In addition, the disparity of samples and their average cell complexity (indicating intricacy of cell shapes) was
evaluated. These data were related to species diversity data and to the abiotic factors. Species diversity was positively
correlated with pH and conductivity. The low-pH localities generally supported a more variable species composition than did
slightly acidic to neutral localities. Conversely, the total nitrogen concentrations of these areas negatively correlated
with species diversity. Interestingly, partial morphological disparity (measuring the contribution of a sample to the overall
morphological variation) did not correlate with species diversity. On the contrary, several mountain peat bog localities had
high disparity values, irrespective of their rather low species diversity. In addition, several samples from minerotrophic
fens with high diversity had average or low values of partial morphological disparity. These results indicate the relative
importance of mountain peat bogs for the total morphological diversity of Desmidiales within the region that could not be ascertained solely from species diversity data. The inner morphological disparity of
samples was highly correlated with their species diversity. Species of the genus Micrasterias, Hyalotheca dissiliens and Desmidium species had the highest partial morphological disparity, thus indicating their marginal position within the morphospace.
Micrasterias and Euastrum species had the highest complexity values. The average cell complexity of individual samples did not correlate with their
diversity or disparity; however, it was positively correlated with the levels of total nitrogen and phosphorus, and illustrates
a pattern different from that arrived at by species diversity data.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.
Handling editor: J. Padisak |
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Keywords: | Desmidiales Elliptic Fourier analysis Geometric morphometrics Peat bogs Morphological disparity |
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