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Publications (10 of 22) Show all publications
Chauvet, E., Ferreira, V., Giller, P. S., McKie, B. G., Tiegs, S. D., Woodward, G., . . . Gessner, M. O. (2016). Litter decomposition as an indicator of stream ecosystem functioning at local-to-continental scales: insights from the European RivFunction project. In: Alex J. Dumbrell, Rebecca L. Kordas; Woodward, Guy (Ed.), Large-scale ecology: model systems to global perspectives (pp. 99-182). London: Academic Press, 55
Open this publication in new window or tab >>Litter decomposition as an indicator of stream ecosystem functioning at local-to-continental scales: insights from the European RivFunction project
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2016 (English)In: Large-scale ecology: model systems to global perspectives / [ed] Alex J. Dumbrell, Rebecca L. Kordas; Woodward, Guy, London: Academic Press , 2016, Vol. 55, p. 99-182Chapter in book (Refereed)
Abstract [en]

RivFunction is a pan-European initiative that started in 2002 and was aimed at establishing a novel functional-based approach to assessing the ecological status of rivers. Litter decomposition was chosen as the focal process because it plays a central role in stream ecosystems and is easy to study in the field. Impacts of two stressors that occur across the continent, nutrient pollution and modified riparian vegetation, were examined at > 200 paired sites in nine European ecoregions. In response to the former, decomposition was dramatically slowed at both extremes of a 1000-fold nutrient gradient, indicating nutrient limitation in unpolluted sites, highly variable responses across Europe in moderately impacted streams, and inhibition via associated toxic and additional stressors in highly polluted streams. Riparian forest modification by clear cutting or replacement of natural vegetation by plantations (e.g. conifers, eucalyptus) or pasture produced similarly complex responses. Clear effects caused by specific riparian disturbances were observed in regionally focused studies, but general trends across different types of riparian modifications were not apparent, in part possibly because of important indirect effects. Complementary field and laboratory experiments were undertaken to tease apart the mechanistic drivers of the continental scale field bioassays by addressing the influence of litter, fungal and detritivore diversity. These revealed generally weak and context-dependent effects on decomposition, suggesting high levels of redundancy (and hence potential insurance mechanisms that can mitigate a degree of species loss) within the food web. Reduced species richness consistently increased decomposition variability, if not the absolute rate. Further field studies were aimed at identifying important sources of this variability (e.g. litter quality, temporal variability) to help constrain ranges of predicted decomposition rates in different field situations. Thus, although many details still need to be resolved, litter decomposition holds considerable potential in some circumstances to capture impairment of stream ecosystem functioning. For instance, species traits associated with the body size and metabolic capacity of the consumers were often the main driver at local scales, and these were often translated into important determinants of otherwise apparently contingent effects at larger scales. Key insights gained from conducting continental scale studies included resolving the apparent paradox of inconsistent relationships between nutrients and decomposition rates, as the full complex multidimensional picture emerged from the large-scale dataset, of which only seemingly contradictory fragments had been seen previously.

Place, publisher, year, edition, pages
London: Academic Press, 2016
Series
Advances in Ecological Research, ISSN 0065-2504 ; 55
Keyword
Stream, river, ecosystem functioning, biodiversity, leaf litter decomposition, nutrient, riparian forest, functional assessment, management
National Category
Ecology
Identifiers
urn:nbn:se:hkr:diva-16183 (URN)10.1016/bs.aecr.2016.08.006 (DOI)000399647700004 ()978-0-08-100935-2 (ISBN)
Available from: 2016-10-19 Created: 2016-10-19 Last updated: 2017-12-20Bibliographically approved
Minh Tran, T., Lacoursière, J. O., Vought, L. B. M., Thanh Doan, P. & Van Tran, M. (2015). Capacity of Vitiver grass in treatment of a mixture of labaratory and domestic wastewaters. In: : . Paper presented at 6th International Conference on Vitiver (ICV6), Da Nang, Vietnam, May 5-8th 2015.
Open this publication in new window or tab >>Capacity of Vitiver grass in treatment of a mixture of labaratory and domestic wastewaters
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2015 (English)Conference paper, Published paper (Other academic)
Abstract [en]

 In this study, laboratory wastewater containing organic matters, heavy metals and aromatic compounds, was treated by vetiver grass (Vetiveria zizanioides) as a phytoremediation method to remove the above three groups of pollutants. Sewage effluent, as a source of nutrient supply for plant growth, was firstly fed to two wetland systems: mini horizontal subsurface flow (HSSF) and floating raft (FR) wetlands. Next, laboratory wastewater was added gradually to mix with sewage. Nominal hydraulic retention time in both wetlands are 12 hours. Pollutants removal efficiencies were monitored. Microbial community change corresponding with each stages of sewage only and mixture with laboratory wastewater was also examined. The examined microbial community includes Nitrogen-fixing (N-fixing) bacteria, Phosphate-solubilizing (P-solubilizing) microorganism, Pseudomonas sp., and Zoogloea sp. 

In HSSF wetland, base materials (gravel and sand), algae, and vetiver root were in turn investigated for pollutant removal efficiencies. The results reveal that even with the presences of heavy metals and aromatic compounds, vetiver presented reasonable removal efficiencies of about 62%, 68.6%, and 58.3% for BOD, TN, and TP removal, respectively. Base materials showed almost no effect on pollutant removal. Algae was slightly responsible for approximate 6.3%, 16.6%, and 19.7% of BOD, TN, and TP removals, respectively. On the other hand vetiver roots, in term of heavy metals, had an impressive removal efficiencies of 99.2, 95.8, 96.2, and 96.7% of Cr+6 (in K2Cr2O7), Mn (MnSO4), Fe (FeSO4), and Cu (CuSO4), respectively. For aromatic compounds, the wetland is responsible for 96.8 and almost 100% of correspondingly phenol and benzene removal efficiencies. For microbial aspect, N-fixing microorganisms (e.g. Azospirillum sp., Azotobacter sp.) and Phosphate-solubilizing bacteria (Bacillus sp.) increased gradually in population during domestic wastewater feeding stage. When laboratory wastewater was added, N-fixing and P-solubilizing bacteria were quantitatively decreased slightly while population of Pseudomonas sp. increased. Besides, Zoogloea sp. was also found increasing through out the experiment and keeping a stable growth even during laboratory wastewater adding. 

In FR wetland, both algae and vetiver root were also investigated for BOD and aromatic compounds and heavy metals. The outcomes show similar tendencies in treatment and microbial behaviours as in HSSF wetland. Vetiver grass, mainly responsible for organic matters and nutrients removal, presented slightly lower removal efficiencies than those in HSSF wetland. The average values of removal efficiencies are 59%, 63.5%, and 53.0% for BOD, TN, and TP removal, respectively. Algae, also, took minor responsibility for approximate 3.3%, 9.1%, and 8.9% of BOD, TN, and TP removals, respectively. Heavy metals of Cr+6 (in K2Cr2O7), Mn (MnSO4), Fe (FeSO4), and Cu (CuSO4) were found removing less than in HSSF wetland with average removal efficiencies values of 92.4, 85.1, 91.8, and 91.5%, respectively, by 

vetiver root. Algae show almost no effect on heavy metals and aromatic removals. The vetiver root likewise plays important role in phenol and benzene removals with values of 91.5 and 96% in efficiency, respectively. N-fixing and P-solubilizing microorganisms, Pseudomonas sp., and Zoogloea sp. presented similar responses tendencies to different living condition when domestic and laboratory wastewaters, in turn, were fed.

Keyword
Vetiver, wastewater, hydraulic retention time, phytoremediation, laboratory, microorganism
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:hkr:diva-14620 (URN)
Conference
6th International Conference on Vitiver (ICV6), Da Nang, Vietnam, May 5-8th 2015
Available from: 2015-09-18 Created: 2015-09-18 Last updated: 2015-12-08Bibliographically approved
Lacoursière, J. O. & Vought, L. B. M. (2015). Measuring residence time distribution in a vegetated pond. In: : . Paper presented at Residence Times in Vegetated Stormwater Ponds - Mid-Project Workshop, The University of Warwick, UK, March 18, 2015..
Open this publication in new window or tab >>Measuring residence time distribution in a vegetated pond
2015 (English)Conference paper, Oral presentation only (Other academic)
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:hkr:diva-14642 (URN)
Conference
Residence Times in Vegetated Stormwater Ponds - Mid-Project Workshop, The University of Warwick, UK, March 18, 2015.
Projects
CITYBLUES++
Available from: 2015-09-21 Created: 2015-09-21 Last updated: 2015-09-22Bibliographically approved
Lacoursière, J. O. & Vought, L. B. M. (2015). Toilets need allies - breaking down silo thinking for decentralized sanitation. In: : . Paper presented at Sanitation Governance - making the system work, Swedish Water House, Stockholm International Water Institute, Stockholm, February 19, 2015..
Open this publication in new window or tab >>Toilets need allies - breaking down silo thinking for decentralized sanitation
2015 (English)Conference paper, Oral presentation only (Other academic)
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:hkr:diva-14643 (URN)
Conference
Sanitation Governance - making the system work, Swedish Water House, Stockholm International Water Institute, Stockholm, February 19, 2015.
Projects
CITYBLUES++
Available from: 2015-09-21 Created: 2015-09-21 Last updated: 2015-09-22Bibliographically approved
Lacoursière, J. O. & Vought, L. B. M. (2014). Creating citywide water-energy-food nexus opportunities: FSM as driving force. In: From faecal sludge to fuel: safe sanitation with business opportunities (workshop). Paper presented at World Water Week 2014 (Water & Energy), Aug. 31 - Sept. 5 2014, Stockholm, Sweden.
Open this publication in new window or tab >>Creating citywide water-energy-food nexus opportunities: FSM as driving force
2014 (English)In: From faecal sludge to fuel: safe sanitation with business opportunities (workshop), 2014Conference paper, Oral presentation only (Other academic)
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:hkr:diva-14622 (URN)
Conference
World Water Week 2014 (Water & Energy), Aug. 31 - Sept. 5 2014, Stockholm, Sweden
Projects
CITYBLUES++
Available from: 2015-09-18 Created: 2015-09-18 Last updated: 2016-01-11Bibliographically approved
Lacoursière, J. O. & Vought, L. B. M. (2014). The challenges of keeping floodplains and wetlands in rapidly growing cities: lessons learnt from 24 years of observing Vientiane, Lao PDR. In: : . Paper presented at SEAFDEC Expert Meeting on Mekong Cooperation on Fisheries, Aquatic Resources and Wetlands: 15 years lesson learnt, 12th - 14th November 2014, Phnom Penh, Cambodia.
Open this publication in new window or tab >>The challenges of keeping floodplains and wetlands in rapidly growing cities: lessons learnt from 24 years of observing Vientiane, Lao PDR
2014 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:hkr:diva-14644 (URN)
Conference
SEAFDEC Expert Meeting on Mekong Cooperation on Fisheries, Aquatic Resources and Wetlands: 15 years lesson learnt, 12th - 14th November 2014, Phnom Penh, Cambodia
Available from: 2015-09-21 Created: 2015-09-21 Last updated: 2016-01-11Bibliographically approved
Woodward, G., Gessner, M. O., Giller, P. S., Gulis, V., Hladyz, S., Lecerf, A., . . . Chauvet, E. (2012). Continental-scale effects of nutrient pollution on stream ecosystem functioning. Science, 336(6087), 1438-1440
Open this publication in new window or tab >>Continental-scale effects of nutrient pollution on stream ecosystem functioning
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2012 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 336, no 6087, p. 1438-1440Article in journal (Refereed) Published
Abstract [en]

Excessive nutrient loading is a major threat to aquatic ecosystems worldwide that leads to profound changes in aquatic biodiversity and biogeochemical processes. Systematic quantitative assessment of functional ecosystem measures for river networks is, however, lacking, especially at continental scales. Here, we narrow this gap by means of a pan-European field experiment on a fundamental ecosystem process—leaf-litter breakdown—in 100 streams across a greater than 1000-fold nutrient gradient. Dramatically slowed breakdown at both extremes of the gradient indicated strong nutrient limitation in unaffected systems, potential for strong stimulation in moderately altered systems, and inhibition in highly polluted streams. This large-scale response pattern emphasizes the need to complement established structural approaches (such as water chemistry, hydrogeomorphology, and biological diversity metrics) with functional measures (such as litter-breakdown rate, whole-system metabolism, and nutrient spiraling) for assessing ecosystem health.

National Category
Biological Sciences
Identifiers
urn:nbn:se:hkr:diva-9495 (URN)000305211700045 ()22700929 (PubMedID)
Available from: 2012-06-28 Created: 2012-06-28 Last updated: 2017-12-07Bibliographically approved
Hladyz, S., Åsbjörnsson, K., Chauvet, E., Dobson, M., Elosegi, A., Ferreira, V., . . . Woodward, G. (2011). Stream ecosystem functioning in an agricultural landscape: the importance of terrestrial-aquatic linkages. In: Guy Woodward (Ed.), Ecosystems in a human-modified landscape: a European perspective (pp. 211-276). San Diego: Academic Press, 44
Open this publication in new window or tab >>Stream ecosystem functioning in an agricultural landscape: the importance of terrestrial-aquatic linkages
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2011 (English)In: Ecosystems in a human-modified landscape: a European perspective / [ed] Guy Woodward, San Diego: Academic Press, 2011, Vol. 44, p. 211-276Chapter in book (Refereed)
Abstract [en]

The loss of native riparian vegetation and its replacement with non-native species or grazing land for agriculture is a worldwide phenomenon, but one that is prevalent in Europe, reflecting the heavily-modified nature of the continent's landscape. The consequences of these riparian alterations for freshwater ecosystems remain largely unknown, largely because bioassessment has traditionally focused on the impacts of organic pollution on community structure. We addressed the need for a broader perspective, which encompasses changes at the catchment scale, by comparing ecosystem processes in woodland reference sites with those with altered riparian zones. We assessed a range of riparian modifications, including clearance for pasture and replacement of woodland with a range of low diversity plantations, in 100 streams to obtain a continental-scale perspective of the major types of alterations across Europe. Subsequently, we focused on pasture streams, as an especially prevalent widespread riparian alteration, by characterising their structural (e.g. invertebrate and fish communities) and functional (e.g. litter decomposition, algal production, herbivory) attributes in a country (Ireland) dominated by this type of landscape modification, via field and laboratory experiments. We found that microbes became increasingly important as agents of decomposition relative to macrofauna (invertebrates) in impacted sites in general and in pasture streams in particular. Resource quality of grass litter (e.g., carbon : nutrient ratios, lignin and cellulose content) was a key driver of decomposition rates in pasture streams. These systems also relied more heavily on autochthonous algal production than was the case in woodland streams, which were more detrital based. These findings suggest that these pasture streams might be fundamentally different from their native, ancestral woodland state, with a shift towards greater reliance on autochthonous-based processes. This could have a destabilizing effect on the dynamics of the food web relative to the slower, detrital-based pathways that dominate in woodland streams.

Place, publisher, year, edition, pages
San Diego: Academic Press, 2011
Series
Advances in ecological research, ISSN 0065-2504 ; 44
Keyword
leaf-litter decomposition, fresh-water ecosystems, complex food-web, riparian vegetation, community structure, headwater streams, new-zealand, land-use, contrasting responses, breakdown rates
National Category
Ecology
Identifiers
urn:nbn:se:hkr:diva-8796 (URN)10.1016/B978-0-12-374794-5.00004-3 (DOI)000293800600005 ()978-0-12-374794-5 (ISBN)
Note

ISI: 000293800600005

Available from: 2011-12-06 Created: 2011-12-06 Last updated: 2015-05-12Bibliographically approved
Mark, O., Lacoursière, J. O., Vought, L. B. M., Amena, Z. & Babel, M. S. (2010). Application of hydroinformatics tools for water quality modeling and management: case study of Vientiane, Lao PDR. Journal of Hydroinformatics, 12(2), 161-171
Open this publication in new window or tab >>Application of hydroinformatics tools for water quality modeling and management: case study of Vientiane, Lao PDR
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2010 (English)In: Journal of Hydroinformatics, ISSN 1464-7141, E-ISSN 1465-1734, Vol. 12, no 2, p. 161-171Article in journal (Refereed) Published
Abstract [en]

The application of hydroinformatics tools is restricted in developing countries due to the non-availability of the required data and information under local conditions. This paper presents the state of water quality of the city of Vientiane (capital of Lao PDR) before the extensive rectification of its drainage network and describes an approach and methodology for water quality modeling. This is done with respect to the application of a combined hydrodynamic/water quality model based on minimal input data and observations for model verification. It further evaluates options to improve the deteriorating water quality observed in the rectified channels associated with the absence of suitable wastewater treatment. Two pollutants associated with the enrichment of receiving water bodies by wastewaters, total-P and NH4-N, are modeled. The modelling study is carried out in three steps: dry weather flow simulation, wet weather flow simulation and nutrient modeling using MOUSE. The dry weather flow simulations are carried out to calibrate the model for hydraulic roughness coefficient, dispersion coefficient and travel time. The wet weather flow simulations analyze the effect on flooding of two channel states, namely unvegetated and vegetated conditions. Nutrient modeling therefore evaluates removal efficiency by the vegetation. Model results are compared with the observed data and recommendations are made with respect to the predicted effects of the water quality improvement schemes studied. In conclusion, the modeling approach herein presented can be applied for performance analyses of urban channels in the developing part of the world, where data are often limited.

Keyword
flooding, MOUSE, nutrients modeling, urban drainage, water quality, management, water quality modeling
National Category
Natural Sciences
Identifiers
urn:nbn:se:hkr:diva-7527 (URN)10.2166/hydro.2009.024 (DOI)000276755000004 ()
Available from: 2010-12-21 Created: 2010-12-20 Last updated: 2017-12-11Bibliographically approved
Pinay, G., Gumiero, B., Tabacchi, E., Gimenez, O., Tabacchi-Planty, A. M., Hefting, M. M., . . . Decamps, H. (2007). Patterns of denitrification rates in European alluvial soils under various hydrological regimes. Freshwater Biology, 52(2), 252-266
Open this publication in new window or tab >>Patterns of denitrification rates in European alluvial soils under various hydrological regimes
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2007 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 52, no 2, p. 252-266Article in journal (Refereed) Published
Abstract [en]

1. Denitrification in floodplain soils is one of the main biological processes emitting and reducing nitrous oxide, a greenhouse gas, and the main process responsible for the buffering capacity of riparian zones against diffuse nitrate pollution. 2. The aim of this study was to measure denitrification rates under a wide range of current climatic conditions and hydrological regimes in Europe (from latitude 64 degrees N to latitude 42 degrees N and from longitude 2 degrees W to longitude 25 degrees E), in order to determine the response patterns of this microbial process under different climatic and hydrological conditions, and to identify denitrification proxies robust enough to be used at the European scale. 3. Denitrification activity was significant in all the floodplain soils studied whatever the latitude. However, we found an increase in rates of an order of magnitude from high to mid latitudes. Maximum rates (above 30 g N m(-2) month(-1)) were measured in the maritime conditions of the Trent floodplain. These rates are similar to mineralisation rates measured in alluvial soils and of the same order of magnitude as the amount of N stored in herbaceous plants in alluvial soils. 4. We used Multivariate Adaptative Regression Splines to relate the response variable denitrification with five relevant predictors, namely soil moisture, temperature, silt plus clay, nitrate content and herbaceous plant biomass. 5. Soil moisture, temperature, and nitrate were the three main control variables of microbial denitrification in alluvial soils in decreasing order of importance. 6. The model developed for denitrification with interaction effects outperformed a pure additive model. Soil moisture was involved in all interactions, emphasising its importance in predicting denitrification. 7. These results are discussed in the context of scenarios for future change in European hydrological regimes.

Keyword
Climate change, Europe, microbial process, riparian zone, river, floodplain, NITROUS-OXIDE PRODUCTION, FRESH-WATER WETLANDS, CLIMATE-CHANGE, RIPARIAN ZONES, SHORTGRASS STEPPE, NUTRIENT DYNAMICS, RIVER FLOODPLAIN, FLUVIAL SYSTEMS, FLOODED SOIL, FOREST
National Category
Natural Sciences
Identifiers
urn:nbn:se:hkr:diva-180 (URN)10.1111/j.1365-2427.2006.01680.x (DOI)000243473600005 ()0046-5070 (ISBN)
Available from: 2009-02-13 Created: 2009-02-11 Last updated: 2017-12-14Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3700-3518

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