Hyporheic biofilm development on artificial substrata, as a tool for assessing trophic status of aquatic systems : first results

To determine the relationship between biofilm characteristics and organic nutrient content, we investigated the development of hyporheic biofilms on artificial substrata (glass slides) in the early phase of bacterial colonization (one week) in contrasting river habitats with significantly different...

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Bibliographic Details
Published in:Annales de limnologie 1998-06, Vol.34 (2), p.119-128
Main Author: Claret, C.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
bacterial counts
bactéries à STE actif
Biological and medical sciences
COD
DOC
dénombrements bactériens
eau interstitielle
ETS-active bacteria
Fresh water ecosystems
Fundamental and applied biological sciences. Psychology
interstitial water
Synecology
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Summary:To determine the relationship between biofilm characteristics and organic nutrient content, we investigated the development of hyporheic biofilms on artificial substrata (glass slides) in the early phase of bacterial colonization (one week) in contrasting river habitats with significantly different concentrations of dissolved organic carbon (DOC) and biodegradable and refractory DOC (BDOC and RDOC). Results suggest that the quality of DOC (i.e. BDOC versus RDOC content) controlled electron -transport system (ETS)-active bacterial abundances early in colonization, while DOC concentrations limit biofilm development only in the latter phase of colonization. Afin de mettre en évidence les relations entre les caractéristiques des biofilms et les concentrations en nutriments organiques du milieu, nous avons suivi la croissance de biofilms hyporhéiques sur des substrats artificiels (lames de verre) durant les premiers stades de colonisation (1 semaine) dans deux habitats aquatiques où les concentrations en carbone organique dissous (COD) et en COD réfractaire et biodégradable (CODR et CODB) sont significativement différentes. Les résultats laissent supposer que la qualité du DOC (i.e. CODB et CODR) exercerait un contrôle sur les bactéries à système de transport d'électrons (STE) actif dès les premiers stades de colonisation, alors que les concentrations en COD ne deviendraient quantitativement limitantes que pour des biofilms bien développés.
ISSN:0003-4088
2100-000X
DOI:10.1051/limn/1998011