Environmental factors affecting chlorophyll-a concentration in tropical floodplain lakes, Central Brazil
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2016
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Chlorophyll-a (Chl-a) has been widely used in the assessment and monitoring of aquatic environments. Local and regional factors can influence Chl-a concentrations; moreover, the connection between terrestrial and aquatic ecosystems is a major paradigm within aquatic ecology. Here, we investigate the spatial distribution of Chl-a concentrations in a tropical savannah floodplain in Central Brazil using a broad spatial data set (a 900-km north-south transect; 30 lakes). We determine the relative importance of local environmental variables (limnological and morphometric) and regional (land use) and spatial distances (spatial eigenvector) on Chl-a concentrations using partial linear regression. We evaluate the direct and indirect effects of local and regional variables on Chl-a with a path analysis. Our results indicate spatially autocorrelated patterns wherein lakes in closer proximity showed more similar levels of Chl-a than more distant lakes. Local environmental factors explained most variance in Chl-a (R 2 adj = 0.28; P = 0.02); more specifically, both lake area and total nitrogen significantly (P < 0.05) explained Chl-a concentrations (direct effects). Meanwhile, regional factors neither directly nor indirectly predicted Chl-a. Thus, internal processes, such as the resuspension of sediment (which is frequent in tropical floodplains), rather than external influences, were the main factors that explained Chl-a concentrations in this study. The importance of local variables in structuring Chl-a concentration may be used to guide the conservation of the aquatic ecosystems in these tropical floodplain lakes.
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Total nitrogen, Spatial eigenvector, Lake area, Araguaia River basin, Land use, Direct effect
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MARCIONILIO, Suzana Maria Loures de Oliveira et al . Environmental factors affecting chlorophyll-a concentration in tropical floodplain lakes, Central Brazil. Environmental Monitoring and Assessment, Berlin, v. 188, e611, 2016. DOI: 10.1007/s10661-016-5622-7. Disponível em: https://link.springer.com/article/10.1007/s10661-016-5622-7. Acesso em: 26 jul. 2023.