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Variance partitioning of deconstructed tropical diatom communities in reservoirs cascade

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Abstract

We used variation partitioning to evaluate significance of local environment, spatial structure and hydrological connectivity in the diatom community variation in phytoplankton and superficial sediments of six reservoirs of southeast Brazil. Common and rare diatom species were represented by different data sets, according to the species relative abundance and frequency of occurrence. To clarify the connectivity effect on the metacommunity organization, analyses were performed with and without a hydrological connectivity matrix as predictor. Results for rare and common species were similar, but explanation power depended on the habitat and the climatic season. The hydrological connectivity predictor proved to play an important role toward explaining the diatom metacommunity dynamics. Consequently, this landscape feature should not be neglected in ecological models of managed rivers.

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Acknowledgements

This study was carried out within the framework of the AcquaSed Project supported by funds from FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo, Grant No. 2009/53898-9), and was undertaken as part of GCM thesis at the Instituto de Botânica, São Paulo, Brazil (FAPESP Fellowship No. 2013/10314-2). CEMB thanks CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for Research Fellowship (No. 305031/2016-3). We deeply appreciate the valuable assistance of the personnel from Votorantim Energia for their logistical support during the fieldwork. We are also grateful to Prof. William de Queiróz (Universidade de Guarulhos, Geoprocessing Laboratory) for the study area illustration.

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Correspondence to Gisele C. Marquardt.

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Marquardt, G.C., Padial, A.A. & Bicudo, C.E.M. Variance partitioning of deconstructed tropical diatom communities in reservoirs cascade. Aquat Sci 80, 17 (2018). https://doi.org/10.1007/s00027-018-0571-6

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  • DOI: https://doi.org/10.1007/s00027-018-0571-6

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