NDLI: Organic matter availability during pre- and post-drought periods in a Mediterranean stream

Content Provider	Springer Nature Link
Author	Ylla, Irene Sanpera Calbet, Isis Vázquez, Eusebi Romaní, Anna M. Muñoz, Isabel Butturini, Andrea Sabater, Sergi
Copyright Year	2010
Abstract	Mediterranean streams are characterized by water flow changes caused by floods and droughts. When intermittency occurs in river ecosystems, hydrologic connectivity is interrupted and this affects benthic, hyporheic and flowing water compartments. Organic matter use and transport can be particularly affected during the transition from wet to dry and dry to wet conditions. In order to characterize the changes in benthic organic matter quantity and quality throughout a drying and rewetting process, organic matter, and enzyme activities were analyzed in the benthic accumulated material (biofilms growing on rocks and cobbles, leaves, and sand) and in flowing water (dissolved and particulate fractions). The total polysaccharide, amino acid, and lipid content in the benthic organic matter were on average higher in the drying period than in the rewetting period. However, during the drying period, peptide availability decreased, as indicated by decreases in leucine aminopeptidase activity, as well as amino acid content in the water and benthic material, except leaves; while polysaccharides were actively used, as indicated by an increase in β-glucosidase activity in the benthic substrata and an increase in polysaccharide content of the particulate water fraction and in leaf material. During this process, microbial heterotrophs were constrained to use the organic matter source of the lowest quality (polysaccharides, providing only C), since peptides (providing N and C) were no longer available. During the flow recovery phase, the microbial community rapidly recovered, suggesting the use of refuges and/or adaptation to desiccation during the previous drought period. The scouring during rewetting was responsible for the mobilization of the streambed and loss of benthic material, and the increase in high quality organic matter in transport (at that moment, polysaccharides and amino acids accounted for 30% of the total DOC). The dynamics of progressive and gradual drought effects, as well as the fast recovery after rewetting, might be affected by the interaction of the individual dynamics of each benthic substratum: sand sediments and leaves providing refuge for microorganisms and organic matter storage, while on cobbles, an active bacterial community is developed in the rewetting. Since global climate change may favor a higher intensity and frequency of droughts in streams, understanding the effects of these disturbances on the materials and biota could contribute to reliable resource management. The maintenance of benthic substrata heterogeneity within the stream may be important for stream recovery after droughts.
Starting Page	217
Ending Page	232
Page Count	16
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	657
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-03-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mediterranean stream Drought Organic matter Lipids Polysaccharides Amino acids Extracellular enzyme activities Benthic substrata Zoology Ecology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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

Microbial biofilm structure and organic matter use in mediterranean streams

Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream

Organic matter decomposition by fungi in a Mediterranean forested stream : contribution of streambed substrata

The effects of drying on sediment nitrogen content in a Mediterranean intermittent stream: a microcosms study

Drought impact on stream detritivores: experimental effects on leaf litter breakdown and life cycles

Coniferous needle litter acts as a stable food resource for stream detritivores

Leaf litter breakdown and benthic invertebrate colonization affected by seasonal drought in headwater lotic systems of Andean Patagonia

Nutrients and light effects on stream biofilms: a combined assessment with CLSM, structural and functional parameters

Organic matter availability during pre- and post-drought periods in a Mediterranean stream

Similar Documents

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

Microbial biofilm structure and organic matter use in mediterranean streams

Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream

Organic matter decomposition by fungi in a Mediterranean forested stream : contribution of streambed substrata

The effects of drying on sediment nitrogen content in a Mediterranean intermittent stream: a microcosms study

Drought impact on stream detritivores: experimental effects on leaf litter breakdown and life cycles

Coniferous needle litter acts as a stable food resource for stream detritivores

Leaf litter breakdown and benthic invertebrate colonization affected by seasonal drought in headwater lotic systems of Andean Patagonia

Nutrients and light effects on stream biofilms: a combined assessment with CLSM, structural and functional parameters

Organic matter availability during pre- and post-drought periods in a Mediterranean stream