Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/23188
Title: | Impact of freshwater inflow on bacterial abundance and activity in the estuarine system Ria de Aveiro |
Author: | Santos, Luísa Vaz, Leandro Marcial Gomes, Newton C. Vaz, Nuno Dias, João Miguel Cunha, Ângela Almeida, Adelaide |
Keywords: | Bacterial biomass productivity Bacterial dynamics Estuary Freshwater inflow Lagrangian model Particle-attached bacteria Ria de Aveiro |
Issue Date: | 2014 |
Publisher: | Elsevier |
Abstract: | The influence of freshwater flow on bacterial communities in the estuarine system Ria de Aveiro (Portugal) was investigated at two sites differently impacted by river inputs, representative of the marine and brackish water zones of the estuary. Sampling events were clustered based on hydrological features. The hydrodynamic was simulated with a Lagrangian model and related to microbiological parameters. Estuarine bacteria responded to different freshwater regimes developing distinct patterns of abundance and activity at the marine and brackish water zones. A circulation pattern induced by high river inflow produced vertical stratification in the marine zone, promoting a seaward flux of bacterioplankton, and stimulating the import of riverine phytoplankton and particle-attached bacteria to the brackish water zone. Advective transport and resuspension processes contributed to a 3-times increase in abundance of particle-attached bacteria during intense freshwater inputs. Additionally, bacterial activity in the estuary was controlled by inorganic nitrogen, responding to different freshwater inputs, which, in association with different prevailing sources of organic substrates induced significant changes in bacterial production. The dynamic and main controlling factors of bacterial communities are clearly impacted by freshwater inputs. Therefore, significant changes in the recycling of nutrients by microbial activities can be expected from alterations in freshwater inputs either related to global climate change or regional hydrological regimes. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/23188 |
DOI: | 10.1016/j.ecss.2013.12.021 |
ISSN: | 0272-7714 |
Appears in Collections: | CESAM - Artigos DBio - Artigos DFis - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Santos et al. - 2014 - Impact of freshwater inflow on bacterial abundance.pdf | 2.57 MB | Adobe PDF |
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