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Organic matter characteristics in a Mediterranean stream through amino acid composition: Changes driven by intermittency

Amino acid composition (quality) and abundance (quantity) of organic matter (OM) in an intermittent Mediterranean stream were followed during transitions from wet to dry and dry to wet conditions. Amino acids were analyzed in benthic material (epilithic biofilms, sand sediments, leaf material) as well as in the flowing water (dissolved organic matter, DOM). A principal component analysis and the estimation of the amino acid degradation index (DI) elucidated differences in amino acid composition and quality among the wet-drought-wet cycle. Amino acid content and composition were dependent on the source of OM as well as on its diagenetic state. The highest-quality OM (high DI and high N content) occurred on epilithic biofilms and the most degraded and lowest-quality OM occurred in sandy sediments. Differences between the pre- and post-drought periods were evident in DOM quality; autochthonous-derived material was predominant during the pre-drought (wet period preceding drying), while allochthonous inputs dominated during the post-drought period (wet period following drying). In contrast, benthic OM compartments were more stable, but benthic OM quality decreased continuously throughout the drought period. This study revealed that wet-drought-wet cycles resulted in subtle changes in benthic OM quality, and degradation of DOM was related to flow intermittency

This study was funded by projects CGL2007-65549/BOS, CGL2008-05618-C02/BOS and Consolider-Ingenio CSD2009-00065 (SCARCE) of the Spanish Ministry of Science and Innovation

© Aquatic Sciences : Research Across Boundaries, 2011, vol. 73, p. 523-535

Springer Verlag

Author: Ylla i Monfort, Irene
Sanpera-Calbet, Isis
Muñoz Gràcia, Isabel
Romaní i Cornet, Anna M.
Sabater, Sergi
Date: 2011
Abstract: Amino acid composition (quality) and abundance (quantity) of organic matter (OM) in an intermittent Mediterranean stream were followed during transitions from wet to dry and dry to wet conditions. Amino acids were analyzed in benthic material (epilithic biofilms, sand sediments, leaf material) as well as in the flowing water (dissolved organic matter, DOM). A principal component analysis and the estimation of the amino acid degradation index (DI) elucidated differences in amino acid composition and quality among the wet-drought-wet cycle. Amino acid content and composition were dependent on the source of OM as well as on its diagenetic state. The highest-quality OM (high DI and high N content) occurred on epilithic biofilms and the most degraded and lowest-quality OM occurred in sandy sediments. Differences between the pre- and post-drought periods were evident in DOM quality; autochthonous-derived material was predominant during the pre-drought (wet period preceding drying), while allochthonous inputs dominated during the post-drought period (wet period following drying). In contrast, benthic OM compartments were more stable, but benthic OM quality decreased continuously throughout the drought period. This study revealed that wet-drought-wet cycles resulted in subtle changes in benthic OM quality, and degradation of DOM was related to flow intermittency
This study was funded by projects CGL2007-65549/BOS, CGL2008-05618-C02/BOS and Consolider-Ingenio CSD2009-00065 (SCARCE) of the Spanish Ministry of Science and Innovation
Format: application/pdf
ISSN: 1015-1621
Document access: http://hdl.handle.net/10256/12522
Language: eng
Publisher: Springer Verlag
Collection: MICYT/PN 2007-2010/CGL2007-65549/BOS
MICINN/PN 2009-2011/CGL2008-05618-C02
MICINN/PN 2009-2014/CSD2009-00065
Reproducció digital del document publicat a: http://dx.doi.org/10.1007/s00027-011-0211-x
Articles publicats (D-CCAA)
Is part of: © Aquatic Sciences : Research Across Boundaries, 2011, vol. 73, p. 523-535
Rights: Tots els drets reservats
Subject: Aminoàcids
Amino acids
Humus
Biofilms
Biodegradació
Biodegradation
Title: Organic matter characteristics in a Mediterranean stream through amino acid composition: Changes driven by intermittency
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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