| Title | MICROBIAL COMMUNITIES IN STREAMBED SEDIMENTS RECOVERING FROM DESICCATION |
| Abstract | 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. |
| Source | FEMS microbiology, ecology (print) 71, pp. 374–386 |
| Keywords | streamclimate changedroughtrewetting |
| Journal | FEMS microbiology, ecology (print) |
| Editor | Elsevier, Amsterdam, Paesi Bassi |
| Year | 2010 |
| Type | Articolo in rivista |
| DOI | 10.1111/j.1574-6941.2009.00819.x |
| Authors | MARXSEN J. (1,2); ZOPPINI A. (3); WILCZEK S. (1) |
| Text | 42357 2010 10.1111/j.1574 6941.2009.00819.x ISI Web of Science WOS 000274163000005 stream climate change drought rewetting MICROBIAL COMMUNITIES IN STREAMBED SEDIMENTS RECOVERING FROM DESICCATION MARXSEN J. 1,2 ; ZOPPINI A. 3 ; WILCZEK S. 1 1 Limnologische Fluss Station des Max Planck Instituts fur Limnologie, Schlitz, Germany; 2 Institut fur Allgemeine und Spezielle Zoologie, Tierokologie, Justus Liebig Universitat, Gießen, Germany; 3 Istituto di Ricerca Sulle Acque, Consiglio Nazionale delle Ricerche, Monterotondo, Rome, Italy 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. 71 http //onlinelibrary.wiley.com/journal/10.1111/ ISSN 1574 6941/homepage/EditorialBoard.html Microbial communities in streambed sediments recovering from 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 and the recovery of microbial functions were explored after rewetting desiccated streambed sediments via a sediment core perfusion technique. Marxsen_Zoppini_Wilczeck_FEMS_10.pdf Articolo in rivista Elsevier 0168 6496 FEMS microbiology, ecology print FEMS microbiology, ecology print FEMS microbiol. ecol. print FEMS microbiology, ecology. print Federation of European Microbiological Societies microbiology, ecology print annamaria.zoppini ZOPPINI ANNAMARIA TA.P02.002.003 Ruolo di comunita microbiche nella degradazione della sostanza organica e nella circolazione del carbonio nei sistemi acquatici |
