Participatory scenario development for integrated assessment of nutrient flows in a Catalan river catchment

Caille, F.; Riera, Joan Lluís; Rodríguez‐Labajos, Beatriz; Middelkoop, H.; Rosell‐Melé, Antoni

doi:10.5194/hessd-4-1265-2007

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…Mean annual rainfall ranges from 1000 mm in the mountains to 600 mm on the coast (Rovira and Batalla ). 77% of the catchment is forested, 16% has crop coverage (in the alluvial deposits) and 7% is covered by urban and industrial areas (Caille et al ). Mean annual discharge is around 4 m 3 s −1 , but as a Mediterranean river the annual hydrology is highly variable (Rovira and Batalla ).…”

Section: Methodsmentioning

confidence: 99%

Sediment microbial communities rely on different dissolved organic matter sources along a Mediterranean river continuum

Freixa

Ejarque

Crognale

et al. 2016

Limnology & Oceanography

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Heterotrophic bacteria play a key role in the degradation of organic matter and carbon cycling in river sediments. These bacterial communities are directly influenced by environmental variables that differ spatially and temporally in rivers. Here, we studied the longitudinal patterns of sediment bacterial community composition and dissolved organic matter utilization under base flow and drought conditions in a Mediterranean river. Our results indicated that sediment microbial communities were affected by dissolved organic matter quality and origin along the river continuum. In headwaters the potential degradation of cellulose and hemicellulose was greater (i.e., higher β-glucosidase and β-xylosidase activities), suggesting higher microbial utilization of allochthonous detritus from terrestrial origin. Conversely, the accumulation and transport of more recalcitrant compounds (i.e., decrease in the recalcitrant index) became potentially relevant downstream. Furthermore, discharge fluctuations had clear effects on bacterial community composition and dissolved organic matter use. The hydrological fragmentation of the river continuum during drought period generated sediment microhabitats dominated by gamma and delta-Proteobacteria, with a greater potential capacity to degrade a wide range of compounds, particularly nitrogen containing moieties. During base flow conditions, we observed a higher occurrence of alpha-Proteobacteria and a greater potential use of more recalcitrant carbon compounds, mostly of terrestrial origin. Overall, our findings suggest an upstream-downstream longitudinal transition of sediment microbial communities that rely on allochthonous to autochthonous dissolved organic matter, and a shift toward autochthonous dissolved organic matter reliance during droughtThis study was supported by the Spanish Ministry of Economy and Competitiveness through projects FLUMED-HOTSPOTS (CGL2011-30151-C02) and FUNSTREAM (CGL2014-58760-C3-R

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Section: Methodsmentioning

confidence: 99%

Sediment microbial communities rely on different dissolved organic matter sources along a Mediterranean river continuum

Freixa

Ejarque

Crognale

et al. 2016

Limnology & Oceanography

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“…With the exception of a small dam in the headwaters, there are no other reservoirs along this river. The 77% of the catchment is forested (mainly composed of evergreen oak forest and some plantations of black poplar and plane tree at the floodplain) and the remaining 16% and 7% are crops (in the alluvial deposits) and urbanindustrial areas, respectively (Rovira & Batalla, 2006;Caille et al, 2007). Population density ranged from less that 100 (headwaters) to 20 000 inhab./km 2 (urban zones).…”

Section: Study Areamentioning

confidence: 99%

Changes in bacterioplankton density and viability in the Tordera river due to the input of effluents from waste water treatment plants

Vivas¹,

Perujo²,

Freixa³

et al. 2017

Limnetica

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Changes in bacterioplankton density and viability in the Tordera river due to the input of effluents from waste water treatment plantsIn middle and lower river basin reaches, bacterioplankton communities are usually found and their development and dynamics depend on the physico-chemical characteristics of the water, the inputs from tributaries, as well as the interactions these communities establish with the riverbed. The aim of this study was to assess whether direct inputs of effluents from wastewater treatment plants (WWTP) to the river generated significant changes in the density and viability of bacterioplankton communities. To achieve this objective, prokaryote density and physico-chemical characteristics in river water were analysed just before and after two WWTP located in the middle and lower parts of the Tordera river basin, as well as in each WWTP effluent. Five samplings were carried out during a base flow period. Moreover, in two occasions, prokaryote density at the riverbed sediment was also measured in order to assess the possible link between benthic and planktonic compartments. Results showed that WWTP effluents carried more prokaryotes and nutrients and had higher temperature than the river reaches receiving such effluents, being their impact more significant in the mid-river than in the low-river reach. In the mid-river reach, WWTP effluent input increased prokaryotic density which may be determined by the higher availability of phosphate and dissolved organic matter which might favour its development, as it is also suggested by the observed increase of prokaryote viability together with a prokaryote cell density which was larger than that predicted from the river and the WWTP effluent prokaryote loads. In contrast, at the down-river reach, prokaryote density was almost not affected by the WWTP effluent input. In this reach, prokaryote viability decreased at the river waters downstream the WWTP. It is suggested that the low oxygen concentration in the WWTP effluent was not favouring bacterioplankton growth, while the lower flow velocity may have favoured the settlement of prokaryote cells at the riverbed, as suggested by the increase in cell density in river sediments. Results showed that river bacteriplankton state is highly dynamic and responsive (viability ranged from 13 to 57%) when receiving effluents with distinct characteristics. Our results suggest that the expected response of increasing river bacterioplankton density and viability when receiving effluents with high loads of nutrients and organic matter will be alleviated by specific physical and chemical characteristics of the main effluent which may inhibit prokaryote growth and/or by specific riverbed characteristics which hold the development of an active benthic microbial community.

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Effects of Wastewater Treatment Plants on Stream Nutrient Dynamics Under Water Scarcity Conditions

Martı́

Riera

Sabater

2009

The Handbook of Environmental Chemistry

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Participatory scenario development for integrated assessment of nutrient flows in a Catalan river catchment

Cited by 3 publications

References 29 publications

Sediment microbial communities rely on different dissolved organic matter sources along a Mediterranean river continuum

Sediment microbial communities rely on different dissolved organic matter sources along a Mediterranean river continuum

Changes in bacterioplankton density and viability in the Tordera river due to the input of effluents from waste water treatment plants

Effects of Wastewater Treatment Plants on Stream Nutrient Dynamics Under Water Scarcity Conditions

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