Community Ecology
Volume/Issue:
Volume 13: Issue 2
Bacterioplankton community composition in Portuguese water bodies under a severe summer drought
Authors:
D. Figueiredo University of Aveiro Department of Biology & CESAM (Centre for Environmental and Marine Studies) 3810-193 Aveiro Portugal

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B. Castro University of Aveiro Department of Biology & CESAM (Centre for Environmental and Marine Studies) 3810-193 Aveiro Portugal

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M. Pereira University of Aveiro Department of Biology & CESAM (Centre for Environmental and Marine Studies) 3810-193 Aveiro Portugal

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A. Correia University of Aveiro Department of Biology & CESAM (Centre for Environmental and Marine Studies) 3810-193 Aveiro Portugal

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Pages:
185–193
Online Publication Date:
21 Nov 2012
Publication Date:
01 Dec 2012
Article Category:
Research Article
DOI:
https://doi.org/10.1556/comec.13.2012.2.8
Keywords:
Bacterial diversity; Drought; Freshwater bodies; Southern Europe; 16SrDNA-DGGE analysis
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In 2005, a severe drought occurred in Portugal, with several reservoirs becoming dry in the southern region. A set of 20 Portuguese water bodies were analysed through denaturing gradient gel electrophoresis (16SrDNA-DGGE) and DNA sequencing to assess its bacterioplankton diversity under these particular conditions. Environmental parameters were determined to assess the trophic conditions of each water body. Most water bodies fell into the meso-to eutrophic and hypereutrophic state. In general, the levels for conductivity, pH and total suspended solids were higher than the average data from previous years. Dominant phylotypes belonged to Cyanobacteria, Actinobacteria Alphaproteobacteria, Betaproteobacteria and Bacteroidetes groups. Despite the geographic distance, common phylotypes could be recorded among water bodies. Bacteroidetes dominated at Sousa River and were related to high nutrient levels. Cyanobacteria dominated at Alentejo reservoirs and correlated with higher conductivity values. However, Actinobacteria showed ubiquitous phylotypes throughout several samples, suggesting its persistence over geographically distant water bodies. This study showed a clear deterioration of water quality, from a physico-chemical point of view; furthermore, dominance of Cyanobacteria and Actinobacteria in reservoirs used for drinking water supply were also detected, which may become a concerning issue. However, the most severe bacterial community composition variations between summer 2005 and others were mainly related to higher water residence times. Thus, along with the expected intensification of drought episodes, with severe effects particularly in Southern Europe, it is clearly predictable an intensification in risks for water quality maintenance and even Public Health.

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Cover Community Ecology
Community Ecology An Interdisciplinary Journal Reporting Progress in Community and Population Studies
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Community Ecology
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