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Community analysis of diatom colonization on artificial substrata in a northern Baltic Sea archipelago: A comparison of methods

ELINA LESKINEN and JOUKO SARVALA
Annales Botanici Fennici
Vol. 25, No. 1 (1988), pp. 21-32
Stable URL: http://www.jstor.org/stable/23726427
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.
Community analysis of diatom colonization on artificial substrata in a northern Baltic Sea archipelago: A comparison of methods
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Abstract

Colonization by diatoms of ceramic and glass panels was studied for 8 weeks in early summer in the hydrolittoral (0.3 m) and sublittoral (2.5 and 5 m) of a brackish-water archipelago at Tvärminne in the northern Baltic Sea. The structure of the diatom community was described with several diversity and evenness indices, species abundance distributions, ranked-abundance and k-dominance curves, and multivariate ordination methods. Altogether 99 diatom species occurred on the panels, while the maximum number of species on a panel at any time was 46. In spite of major differences in abundance, the development of the diatom community at all three depths and on the two substrata showed a similar pattern, passing from the strong dominance of a single species towards the more even distribution of more numerous species. In the sublittoral, there were no consistent differences between the substrata, but in the hydrolittoral the diatom community on glass had higher dominance early in the study period. The diversity ordering of the diatom associations at the end of the study period showed the lowest diversity and highest dominance in the hydrolittoral. The simplest and most efficient description of changes in the structure of the diatom community was obtained with the number of species observed in samples of standardized size together with ranked-abundance or k-dominance curves. The spatial and temporal patterns of diatom colonization were successfully described by principal coordinates analysis with Williamson's modification for calculating distances and correspondence analysis.

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