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

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• 作者：Irene Ylla (1) irene.ylla@gmail.com
  Isis Sanpera-Calbet (2)
  Isabel Mu?oz (2)
  Anna M. Romaní (1)
  Sergi Sabater (13)
• 关键词：Amino acids – Biofilms – Intermittency – Mediterranean stream – Degradation index – Drought periods
• 刊名：Aquatic Sciences - Research Across Boundaries
• 出版年：2011
• 出版时间：November 2011
• 年：2011
• 卷：73
• 期：4
• 页码：523-535
• 全文大小：2.0 MB
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• 作者单位：1. Institute of Aquatic Ecology, University of Girona, Campus Montilivi, 17071 Girona, Spain2. Department of Ecology, University of Barcelona, Avinguda Diagonal 645, 08028 Barcelona, Spain3. Catalan Institute for Water Research (ICRA), Emili Grahit 101, 17003 Girona, Spain
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Oceanography
  Life Sciences
  
• 出版者：Birkh盲user Basel
• ISSN：1420-9055

文摘

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.