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

Content Provider	Springer Nature Link
Author	Ylla, Irene Sanpera Calbet, Isis Muñoz, Isabel Romaní, Anna M. Sabater, Sergi
Copyright Year	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.
Starting Page	523
Ending Page	535
Page Count	13
File Format	PDF
ISSN	10151621
Journal	Aquatic Sciences
Volume Number	73
Issue Number	4
e-ISSN	14209055
Language	English
Publisher	SP Birkhäuser Verlag Basel
Publisher Date	2011-05-26
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Amino acids Biofilms Intermittency Mediterranean stream Degradation index Drought periods Life Sciences Marine & Freshwater Sciences Freshwater & Marine Ecology Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Water Science and Technology Ecology, Evolution, Behavior and Systematics

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