Abstract
We developed the Trophic Diatom Index for Reservoirs (TDIR), the first index proposal for water trophic quality assessment of tropical reservoirs in Brazil. Furthermore, we applied four borrowed diatom indices to compare their performances with TDIR. The proposal development considered a calibration set from surface sediment diatoms (n = 113) from reservoirs ranging from ultraoligotrophic to hypereutrophic. Weighted averaging methods were applied to infer optimum (values) and tolerances for total phosphorous for each diatom species. Indicative values were categorized within the trophic classification for tropical reservoirs, and sensitivity values were classified according to the range of tolerances of diatom species. The TDIR index scores ranged from 1 (ultraoligotrophic) to 6 (hypereutrophic). The TDIR showed good performance for the trophic classification of reservoirs. In contrast, the borrowed diatom indices developed in subtropical rivers underestimated the water quality, whereas the diatom index developed for lakes in temperate regions overestimated the water quality of our reservoirs. Moreover, we calculated new records of indicative values, and some well-cited species had different optimum and tolerances values concerning other well-known studies. TDIR provides an applicable index and contributes as a reliable tool for assessing the water quality and ecological status of tropical reservoirs.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
This study was carried out in the context of the AcquaSed project, funded by FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo, AcquaSed Project, no 2009/53898-9), at the Institute of Botany, presently Environmental Research Institute (São Paulo, Brazil). We would like to thank the FAPEAM (Fundação de Amparo à Pesquisa do Estado do Amazonas, Edital N. 003/2015 RH-INTERIORIZAÇÃO) for AMSL’s Ph.D. scholarship and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for grants 310404/2016-9 and 310176/2019-0 to DCB. We deeply thank all the students from the Department of Ecology involved in field and laboratory work and those who collaborated in the construction of the AcquaSed database. We are grateful to editor and two reviewers for all interesting insights and suggestions.
Funding
This study was carried out in the context of the AcquaSed project, funded by FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo, AcquaSed Project, no 2009/53898-9), at the Institute of Botany, presently Environmental Research Institute (São Paulo, Brazil). We would like to thank the FAPEAM (Fundação de Amparo à Pesquisa do Estado do Amazonas, Edital N. 003/2015 RH-INTERIORIZAÇÃO) for AMSL’s Ph.D. scholarship and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for grants 310404/2016-9 and 310176/2019-0 to DCB.
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da Silva-Lehmkuhl, A.M., Blanco, S. & Bicudo, D.C. A new Trophic Diatom Index for Tropical Reservoirs (TDIR). Hydrobiologia 849, 4651–4666 (2022). https://doi.org/10.1007/s10750-022-05003-7
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DOI: https://doi.org/10.1007/s10750-022-05003-7