Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/22499

TitleBacterial diversity and geochemical profiles in sediments from eutrophic Azorean lakes
Author(s)Martins, Gilberto
Henriques, Isabel
Ribeiro, Daniel
Correia, António
Bodelier, P. L.
Cruz, J. Virgílio
Brito, A. G.
Nogueira, R.
KeywordsSediments
Geochemical profiles
Bacterial community
Composition
Eutrophication
bacterial community composition
Issue date2012
PublisherTaylor & Francis
JournalGeomicrobiology Journal
Abstract(s)In Azores, the advanced trophic state of the lakes requires a fast intervention to achieve the good ecological status prescribed by the Water Framework Directive. Despite the considerable effort made to describe the phytoplankton growing on the water column, the lack of information regarding the microbial processes in sediments is still high. Thus, for the successful implementation of internal management actions, the present work explored the relationships between geochemical profiles and dominant members of the bacterial community in sediments from eutrophic Azorean lakes. Lake Azul geochemical profiles were quite homogeneous for all parameters, while in lake Furnas the total iron profile presented a peak below the aerobic layer. For lake Verde, the concentrations of all studied parameters (20±2 % loss-on-ignition; 2.10±0.08 mg g-1 total phosphorus; 1.31±0.50 mg g-1 total nitrogen; 8.06±0.13 mg g-1 total iron) in the uppermost sediment layer were approximately two times higher than the ones in sediments from other lakes, decreasing with sediment depth. The higher amounts of phosphorus and organic matter in lake Verde suggested a higher internal contribution of phosphorus to eutrophication. The dominant members of the sediment bacterial community, investigated by denaturing gradient gel electrophoresis, were mostly affiliated to Proteobacteria phylum (Alpha-, Delta-, and Gamma-subclasses), group Bacteroidetes/Chlorobi and phylum Chloroflexi. The Cyanobacteria phylum was solely detected in sediments from lake Verde and lake Furnas that presented the highest amounts of nitrogen and phosphorus both in the water column and sediments, while the other phyla were detected in sediments from the three studied lakes. In conclusion, management measurers to achieve the good ecological status until 2015 should be distinct for the different lakes taking into account the relative magnitude of the nutrient sources and the bacterial diversity in sediments
TypeArticle
URIhttp://hdl.handle.net/1822/22499
DOI10.1080/01490451.2011.619633
ISSN0149-0451
Other identifiers1521-0529
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

Files in This Item:
File Description SizeFormat 
01490451.2011.pdf
  Restricted access
436,05 kBAdobe PDFView/Open    Request a copy!

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID