Abstract
The desmids constitute a highly diverse group with potential as a bioindicator of the conservation status of freshwater environments. We evaluated the changes in the desmid community on macrophytes with different structural complexities within mixed stands in a floodplain shallow lake in the Brazilian semi-arid region. Our main question was whether the environmental variables that best predict desmid structure among macrophyte species in mixed stands. Samplings were performed at each two months at four fixed stations during one year in a shallow tropical lake. To assess the changes in community structure, we sampled the periphyton on three macrophytes species (Cabomba caroliniana, Nymphaea amazonum, and Utricularia foliosa) with different complexity levels, which were quantified by their fractal dimension. Multivariate analysis showed that the structure and composition of the periphytic desmids were influenced by fractal dimension, nutrient availability, and temperature. The richness, density, and diversity of desmids differed between macrophytes with complex structure (U. foliosa and C. caroliniana) and simple structure (N. amazonum). We also observed that more complex macrophytes have a greatest contribution of desmids with small cell (< 40 μm) in the community, suggesting that the substrate complexity affects the use of habitat. Our results suggest that the substantial fractal differences between host macrophytes are a major determining factor in the structure of periphytic desmid communities.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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To the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and the Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB: Project “Flora da Bahia,” 483909/2012) for the financial support. To the CNPq for the doctoral scholarship granted (141734/2017-5) to the first author. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.
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This study was financed in part by the Conselho Nacional de Aperfeiçoamento Científico e Tecnológico (CNPq), by Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB) and by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES).
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The study conception, material preparation, data collection, and analysis were performed by Maria Aparecida dos Santos, Carlos Wallace do Nascimento Moura, and Carla Ferragut. Daniela Mariano Lopes da Silva contributed to the chemical analysis. Nadson Ressyé Simões contributed to the study design and statistical analysis. The first draft of the manuscript was written by Maria Aparecida dos Santos and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Fig. S1
Associations between the environmental variables and desmids richness: a Relation between desmids richness and water temperature considered only macrophytes with df > 1.656; b relation between desmids richness and P-PO4, considered only the macrophytes with df > 1.656; and c relation between the desmids richness and DIN, considered only the macrophytes with df < 1.656. Supplementary file1 (TIF 11485 kb)
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dos Santos, M.A., Ferragut, C., Simões, N.R. et al. What are the main environmental predictors of differences in the community structure of periphytic desmids in a semi-arid floodplain lake?. Aquat Ecol 56, 1037–1053 (2022). https://doi.org/10.1007/s10452-022-09957-7
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DOI: https://doi.org/10.1007/s10452-022-09957-7