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- W2117557552 abstract "Summary We used catalysed reported deposition – fluorescence in situ hybridization (CARD‐FISH) to analyse changes in the abundance of the bacterial groups Alphaproteobacteria , Gammaproteobacteria and Bacteroidetes, and of hydrocarbon‐degrading Cycloclasticus bacteria in mesocosms that had received polycyclic aromatic hydrocarbons (PAHs) additions. The effects of PAHs were assessed under four contrasting hydrographic conditions in the coastal upwelling system of the Rías Baixas: winter mixing, spring bloom, summer stratification and autumn upwelling. We used realistic additions of water soluble PAHs (approximately 20–30 μg l −1 equivalent of chrysene), but during the winter period we also investigated the effect of higher PAHs concentrations (10–80 μg l −1 chrysene) on the bacterial community using microcosms. The most significant change observed was a significant reduction (68 ± 5%) in the relative abundance of Alphaproteobacteria . The magnitude of the response of Cycloclasticus bacteria (positive with probe CYPU829) to PAHs additions varied depending on the initial environmental conditions, and on the initial concentration of added PAHs. Our results clearly show that bacteria of the C ycloclasticus group play a major role in low molecular weight PAHs biodegradation in this planktonic ecosystem. Their response was stronger in colder waters, when their background abundance was also higher. During the warm periods, the response of Cycloclasticus was limited, possibly due to both, a lower bioavailability of PAHs caused by abiotic factors (solar radiation, temperature), and by inorganic nutrient limitation of bacterial growth." @default.
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- W2117557552 date "2007-06-27" @default.
- W2117557552 modified "2023-10-18" @default.
- W2117557552 title "Dynamics of the hydrocarbon‐degrading <i>Cycloclasticus</i> bacteria during mesocosm‐simulated oil spills" @default.
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- W2117557552 doi "https://doi.org/10.1111/j.1462-2920.2007.01373.x" @default.
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