Effects of land use and spatial processes in water and surface sediment of tropical reservoirs at local and regional scales

Autor(es)

Salim, Aline ^[2] ; Nascimento, Majoi de Novaes ^[2] ; Bini, Luis Mauricio ^[3] ; Bicudo, Denise Campos ^[4]

Afiliação do(s) autor(es)

^[1] Secretaria Estado Meio Ambiente, Ave Prof Freder Hermann Jr 345, BR-05459900 Sao Paulo, SP - Brazil

^[2] Florida Inst Technol, Dept Biol Sci, Paleo Ecol Lab, 150 W Univ Blvd, Melbourne, FL 32901 - USA

^[3] Univ Fed Goias, Inst Ciencias Biol, Dept Ecol, Ave Esperanca S-N, BR-74690900 Goiania, Go - Brazil

^[4] Inst Bot, Dept Ecol, Ave Miguel Stefano 3687, BR-04301012 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Science of The Total Environment; v. 644, p. 237-246, DEC 10 2018.
• Citações Web of Science: 9

Resumo

The effects of land use and connectivity on the characteristics of aquatic ecosystems are thought to be scale-dependent. This study aimed to evaluate the relationships between land use and reservoir characteristics at two spatial scales, after controlling for spatial processes. Water and surface sediment samples were collected from 31 sites (7 reservoirs) in the Paiva Castro and Piracicaba River basins (Cantareira System, Sao Paulo State, Brazil), during austral summer and winter. The dataset included 15 water quality variables and 6 surface sediment variables. Land use variables (natural areas, pasture, agriculture and urban areas) were obtained at two spatial scales (buffer and watershed) in each reservoir. Spatial variables were calculated using Moran's Eigenvectors Maps and Asymmetric Eigenvector Maps. The strengths of the relationships between land use and sediment variables were stronger than those between land use and water quality variables. The strengths of some of the relationships were scale-dependent. Finally, spatial processes, mostly hydrological connectivity, play an important role in water-sediment quality and should be considered in landscape management programs. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/23703-7 - Biodiversidade e distribuição das diatomáceas e seu uso na bioindicação da qualidade de represas da Bacia do Rio Piracicaba e do Sistema Cantareira
• Beneficiário: Stéfano Zorzal de Almeida
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/53898-9 - Reconstrução paleolimnológica da Represa Guarapiranga e diagnóstico da qualidade atual da água e dos sedimentos de mananciais da RMSP com vistas ao gerenciamento do abastecimento
• Beneficiário: Carlos Eduardo de Mattos Bicudo
• Modalidade de apoio: Auxílio à Pesquisa - Temático