Hydrological pulse regulating the bacterial heterotrophic metabolism between Amazonian mainstems and floodplain lakes
| Autor: | Luiz F. Artigas, Luciana O. Vidal, Fábio Roland, Mariana Câmara dos Reis, Marc F. Benedetti, Marcelo Bernardes, Michaela Ladeira de Melo, Lúcia M. Lobão, Patricia Moreira-Turcq, Valdemar L. Tornisielo, Gwenaël Abril |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Microbiology (medical)
Bacterial carbon demand Floodplain Amazonian Heterotroph lcsh:QR1-502 Bacterial growth Biology Microbiology bacterial production lcsh:Microbiology bacterial growth efficiency Dissolved organic carbon Respiration Organic matter Original Research chemistry.chemical_classification geography hydrological pulse geography.geographical_feature_category Ecology Aquatic ecosystem chemistry Environmental chemistry Amazonian freshwater ecosystems bacterial respiration |
| Zdroj: | Frontiers in Microbiology, Vol 6 (2015) Frontiers in Microbiology |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|