Abstract:
:Dissolved organic carbon (DOC) photochemical reactions establish important links between DOC and planktonic bacteria. We hypothesize that seasonal changes in DOC quality, related to the flood pulse, drive the effects of light-DOC interactions on uptake by planktonic bacteria uptake in clear-water Amazonian ecosystems. Water samples from two ecosystems (one lake and one stream) were incubated in sunlight during different hydrological periods and were then exposed to bacterial degradation. Photochemical and bacterial degradation were driven by seasonal DOC inputs. Bacterial mineralization was the main degradation pathway of autochthonous DOC in the lake, while allochthonous DOC was more available for photochemical oxidation. We suggest that sunlight enhances the bacterial uptake of refractory DOC but does not alter uptake of labile forms. We also observed a positive relationship between sunlight and bacterial degradation of DOC, instead of competition. We conclude that photochemical reactions and bacteria complementarily degrade the different sources of DOC during the flood pulse in Amazonian clear-water aquatic ecosystems.
journal_name
FEMS Microbiol Ecoljournal_title
FEMS microbiology ecologyauthors
Amado AM,Farjalla VF,Esteves Fde A,Bozelli RL,Roland F,Enrich-Prast Adoi
10.1111/j.1574-6941.2006.00028.xsubject
Has Abstractpub_date
2006-04-01 00:00:00pages
8-17issue
1eissn
0168-6496issn
1574-6941pii
FEM028journal_volume
56pub_type
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