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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Environmental and spatial drivers of diatom assemblages in the water column and surface sediment of tropical reservoirs

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Author(s):
Bartozek, Elaine C. R. [1, 2] ; da Silva-Lehmkuhl, Angela M. [1, 2, 3] ; Gregory-Eaves, Irene [4] ; Bicudo, Denise C. [2]
Total Authors: 4
Affiliation:
[1] Univ Estadual Paulista, Inst Biociencias, Rio Claro, SP - Brazil
[2] Inst Bot, Dept Ecol, Av Miguel Stefano 3687, BR-04301902 Sao Paulo, SP - Brazil
[3] Univ Fed Amazonas, Inst Ciencias Sociais Educ & Zootecnia, Parintins, AM - Brazil
[4] McGill Univ, Dept Biol, Montreal, PQ - Canada
Total Affiliations: 4
Document type: Journal article
Source: JOURNAL OF PALEOLIMNOLOGY; v. 62, n. 3, p. 245-257, OCT 2019.
Web of Science Citations: 0
Abstract

The relative contribution of environmental and spatial drivers of community structure has been the focus of many ecological studies. In the context of metacommunity theory, diatoms have been associated mainly with local environmental factors, but in some cases spatial factors have also been identified as important drivers. This study aimed to determine the relative importance of environmental and spatial drivers as predictors of surface sediment and water column diatom assemblages in tropical reservoirs. Sampling was carried out in 33 reservoirs in southeast Brazil, which range in trophic state from oligotrophic to hypereutrophic, and span five hydrological basins. We performed a partial RDA between the predictor matrices (environmental and spatial predictors) and the response matrix (either surface sediment or water column diatom assemblages) to identify the main environmental drivers, and used variation partitioning to assess the relative contribution of environmental and spatial predictors of diatom assemblages. In general, diatom assemblages were structured by a combination of environmental and spatial drivers. Comparisons of results between surface sediment and water column ordinations demonstrated that the assemblages were structured by similar environmental variables (productivity-related variables such as total phosphorus, water transparency and pH) and by a similar set of diatom species, mainly centric diatoms like Aulacoseira granulata var. granulata, A. tenella, Discostella stelligera and Spicaticribra kingstonii. Overall, surface sediment diatoms were more strongly associated with environmental factors than were water-column assemblages, probably because they integrate information in space and time, confirming that surface sediment assemblages are robust indicators of environmental conditions. (AU)

FAPESP's process: 09/53898-9 - Paleolimnological reconstruction of Guarapiranga Reservoir and diagnosis of water and sediment current quality of SPMR water supply reservoirs facing their management
Grantee:Carlos Eduardo de Mattos Bicudo
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 13/14337-7 - Influence of trophic status and habitat in the distribution of diatoms in reservoirs of the Mid Tietê river/Alto Sorocaba basin (SP, Brazil).
Grantee:Elaine Cristina Rodrigues Bartozek
Support Opportunities: Scholarships in Brazil - Doctorate