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          Institute: MPI für Evolutionsbiologie     Collection: Limnological River Station Schlitz     Display Documents

ID: 442366.0, MPI für Evolutionsbiologie / Limnological River Station Schlitz
Microbial communities in streambed sediments recovering from desiccation
Authors:Marxsen, Jürgen; Zoppini, Annamaria; Wilczek, Sabine
Date of Publication (YYYY-MM-DD):2010-02-01
Title of Journal:FEMS Microbiology Ecology
Journal Abbrev.:FEMS Microbiol. Ecol.
Issue / Number:3
Start Page:374
End Page:386
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Climate change affects running waters not only by increasing temperatures but also by increasing discharge variability as more frequent and severe floods and more frequent and longer droughts occur, especially in upper reaches. Mediterranean streams are known to experience droughts, but Central European headwaters are also beginning to be affected. The development of bacterial communities (abundance, composition) and the recovery of microbial functions (bacterial production, extracellular enzyme activity) were explored after rewetting desiccated streambed sediments via a sediment core perfusion technique. The bacterial community composition changed only slightly in the sediments from the Central European stream Breitenbach (Germany), but distinctly in the Mediterranean Mulargia River (Sardinia, Italy) during 4 days of experimental rewetting. Breitenbach sediments probably enabled survival of bacterial communities more similar to indigenous streambed communities, because they were less dry. High activity of enzymes involved in polymer degradation at the beginning of rewetting in both sediments indicated the persistence of extracellular enzymes during drought. After 4 days, nearly all microbial activities reached a level similar to unaffected sediments for the Breitenbach, but not for Mulargia. Here, much more intense drying resulted in a more distinct change and reduction of the microbial community, responsible for slower recovery of structure and functions.
Free Keywords:stream; climate change; drought; rewetting; bacterial community composition; extracellular enzymes
Comment of the Author/Creator:Published online: 26 Nov 2009. Final version published online: 23 December 2009.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Evolutionsbiologie/AG Limnologische Fluss-Station
External Affiliations:Istituto di Ricerca Sulle Acque, Consiglio Nazionale delle Ricerche, Monterotondo, Rome, Italy;
Institut für Allgemeine und Spezielle Zoologie, Tierökologie, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 26-32, 35392 Gießen, Germany
LOCALID:1108 [Publication no.]
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