Diatoms and biomonitoring: should cell size be accounted for? |
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Authors: | Isabelle Lavoie Stéphane Campeau Marie-Andrée Fallu Peter J Dillon |
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Institution: | (1) Trent University, K9J 7B8 Peterborough, Ontario, Canada;(2) Université du Québec à Trois-Rivières, G9A 5H7 Trois-Rivières, Québec, Canada |
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Abstract: | Despite the fact that biovolume calculation is a common procedure in most phytoplankton and periphyton studies, diatom community
analyses are usually based on relative abundance data. In a biomonitoring context, a community metric that accounts for cell
size could be of interest due to the potential differences that might exist in nutrient uptake between large and small-sized
species. This paper addresses the question of whether diatom community analysis should be based on relative abundance, biovolume
or cell surface. The results show that although community structure expressed as relative proportion of taxa varied according
to the metric used, the ordinations conducted with each metric were similar. The explained percentage of species variance
was slightly higher with the relative abundance metric compared to the metrics based on relative biovolume or cell surface
area. Partial CCAs showed that each water chemistry variable generally explained a higher portion of species variance when
the relative abundance was used. The analyses conducted with two size groups (small and large taxa) expressed as relative
abundance and relative biovolume showed similar results. Moreover, our data showed that there is no significant relationship
between diatom size and total phosphorus. According to these results, it seems that relative abundance would be the most appropriate
metric to use for biomonitoring purposes. The biovolume and cell surface area calculations added substantially to the total
analysis time due to the numerous measurements required, but did not improve the variance explained in community structure,
and site ordinations were not significantly different.
Electronic supplementary material Electronic supplementary material is available for this article at
and accessible for authorised users. |
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Keywords: | bioassessment biovolume cell surface diatom community structure relative abundance valve area |
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