Vidal L. O., Abril G., Artigas L. F., Melo M. L., Bernardes M. C., Lobao L. M., Reis M. C., Moreira Turcq Patricia, Benedetti M., Tornisielo V. L., Roland F. (2015). Hydrological pulse regulating the bacterial heterotrophic metabolism between Amazonian mainstems and floodplain lakes. Frontiers in Microbiology, 6, p. art. 1054 [10 p.]. ISSN 1664-302X.
Titre du document
Hydrological pulse regulating the bacterial heterotrophic metabolism between Amazonian mainstems and floodplain lakes
Année de publication
2015
Auteurs
Vidal L. O., Abril G., Artigas L. F., Melo M. L., Bernardes M. C., Lobao L. M., Reis M. C., Moreira Turcq Patricia, Benedetti M., Tornisielo V. L., Roland F.
Source
Frontiers in Microbiology, 2015,
6, p. art. 1054 [10 p.] ISSN 1664-302X
We evaluated in situ rates of bacterial carbon processing in Amazonian floodplain lakes and mainstems, during both high water (HW) and low water (LW) phases (p < 0.05). Our results showed that bacterial production (BP) was lower and more variable than bacterial respiration, determined as total respiration. Bacterial carbon demand was mostly accounted by BR and presented the same pattern that BR in both water phases. Bacterial growth efficiency (BGE) showed a wide range (0.2 -23%) and low mean value of 3 and 6%, (in HW and LW, respectively) suggesting that dissolved organic carbon was mostly allocated to catabolic metabolism. However, BGE was regulated by BP in LW phase. Consequently, changes in BGE showed the same pattern that BP. In addition, the hydrological pulse effects on mainstems and floodplains lakes connectivity were found for BP and BGE in LW. Multiple correlation analyses revealed that indexes of organic matter (OM) quality (chlorophyll-a, N stable isotopes and C/N ratios) were the strongest seasonal drivers of bacterial carbon metabolism. Our work indicated that: (i) the bacterial metabolism was mostly driven by respiration in Amazonian aquatic ecosystems resulting in low BGE in either high or LW phase; (ii) the hydrological pulse regulated the bacterial heterotrophic metabolism between Amazonian mainstems and floodplain lakes mostly driven by OM quality.
Plan de classement
Limnologie biologique / Océanographie biologique [034]
;
Ecologie, systèmes aquatiques [036]
;
Hydrologie [062]
Description Géographique
BRESIL ; AMAZONIE ; AMAZONE BASSIN ; SOLIMOES COURS D'EAU ; RIO NEGRO ; MADEIRA COURS D'EAU ; URUBU COURS D'EAU ; TAPAJOS COURS D'EAU ; CABALIANA LAC ; JANAUACA LAC ; MIRITITUBA LAC ; CANACARI LAC ; CURUAI LAC
Localisation
Fonds IRD [F B010065404]
Identifiant IRD
fdi:010065404
