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  • 1. Back, C
    et al.
    Boisvert, J
    Lacoursière, Jean O.
    Charpentier, G
    High-dosage treatment of a Quebec stream with Bacillus thuringiensis serovar. israelensis: efficacy against black fly larvae (Diptera, Simuliidae) and impact on nontarget insects1985Ingår i: Canadian Entomologist, ISSN 0008-347X, E-ISSN 1918-3240, Vol. 117, nr 12, s. 1523-1534Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A typical lake outlet of the Canadian Shield was treated for 15 min with a high dose (5.28 g/L s−1 of discharge) of Teknar®, a commercial formulation of Bacillus thuringiensis serovar. israelensis. Efficacy on Simuliidae larvae and impact on non-target aquatic insects of this stream were monitored using drift nets, counting plates, and artificial turf substrates along a 1000-m section downstream of the site of application. Compared with a 4-day pre-treatment average for 12-h sampling periods, drift of Simuliidae increased from 64 to 92 ×, with shorter peaks of 133–184 ×, 2–6 h after treatment. There was no evident drift increase in larvae of Ephemeroptera, Plecoptera, Trichoptera, Chironomidae, or dipterous pupae, but larvae of Blephariceridae (Diptera) were severely affected as their drift was increased by up to 50 × and remained high for 3 days. After 30 h the mortality of Simuliidae on counting plates ranged from 95 to 82% in the first 300 m, with detachment rates of 78.5–46.5%. Densities of non-target insect larvae were not reduced on the artificial substrates, except for 2 genera of Chironomidae (Eukiefferella and Polypedilum) which were reduced 26 to 39% of their original density. Drifting larvae of 1 chironomid genus (Phaenopsectra) also showed symptoms of toxemia by B.t.i. The main impact of the treatment was thus seen in 2 Nematocera families (Chironomidae and Blephariceridae) which were mainly exposed to B.t.i. sedimented on the bottom of the stream or attached to periphyton growing on rocks.

  • 2.
    Carlsson, Nils O L
    et al.
    Lunds universitet.
    Lacoursière, Jean O.
    Lunds universitet.
    Herbivory on aquatic vascular plants by the introduced golden apple snail (Pomacea canaliculata) in Lao PDR2005Ingår i: Biological Invasions, ISSN 1387-3547, E-ISSN 1573-1464, Vol. 7, nr 2, s. 233-241Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The effect of naturally found densities of the exotic and herbivorous golden apple snail (Pomacea canaliculata) on three dominant aquatic plants – duckweed (Lemna minor), water hyacinth (Eichhornia crassipes) and morning glory (Ipomoea aquatica) – was assessed in a wetland survey and quantified in a field experiment in Laos in southeast Asia. Snail grazing reduced plant biomass, but plant species were differently affected by grazing. Duckweed had almost disappeared after 6 and water hyacinth after 21 days, whereas morning glory remained at 80% of initial biomass after 32 days. Snail growth was lowest on morning glory and, when all plant species were simultaneously presented to snails, this plant was not preferred. We suggest that the negative effect the golden apple snail had on the growth of these plant species in field enclosures is present in the natural environment as well. This new and intense herbivory could have serious negative effects on invaded freshwater ecosystems in this region.

  • 3.
    Chauvet, Eric
    et al.
    Frankrike.
    Ferreira, V.
    Portugal.
    Giller, P. S.
    Irland.
    McKie, B. G.
    SLU, Uppsala.
    Tiegs, S. D.
    USA.
    Woodward, G.
    Storbritannien.
    Elosegi, A.
    Spanien.
    Dobson, M.
    Storbritannien.
    Fleituch, T.
    Polen.
    Graca, M. A. S.
    Portugal.
    Gulis, V.
    USA.
    Hladyz, S.
    Australien.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Lecerf, A.
    Frankrike.
    Pozo, J.
    Spanien.
    Preda, E.
    Rumänien.
    Riipinen, M.
    Storbritannien.
    RisŸnoveanu, G.
    Rumänien.
    Vadineanu, A.
    Rumänien.
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Gessner, M. O.
    Tyskland.
    Litter decomposition as an indicator of stream ecosystem functioning at local-to-continental scales: insights from the European RivFunction project2016Ingår i: Large-scale ecology: model systems to global perspectives / [ed] Alex J. Dumbrell, Rebecca L. Kordas; Woodward, Guy, London: Academic Press , 2016, Vol. 55, s. 99-182Kapitel i bok, del av antologi (Refereegranskat)
    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.

  • 4. Hart, J.R.
    et al.
    Tiev, V.
    Stovin, V.R.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Guymer, I.
    The effects of vegetation on the hydraulic residence time of stormwater ponds2014Ingår i: Proceedings of the 19th IAHR-APD Congress 2014, Hanoi, Vietnam, 2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    Storm water ponds treat polluted run-off from urban areas, highways and agricultural land. Vegetation plays a key role in water treatment, but further understanding is required to identify how vegetation density and spatial distribution within a pond affect the residence time, an important parameter with respect to water treatment. This paper presents results from a preliminary study where the residence time distribution and discharge of a water treatment pond were measured at two stages within the vegetation’s seasonal growth cycle, representing the minimum and maximum states of the vegetation’s density. The results show clear and significant differences between the residence time distribution for the two cases, and highlight the need for further work on the topic.

  • 5.
    Hladyz, Sally
    et al.
    University College Cork, Department of Zoology.
    Åsbjörnsson, Kajsa
    University College Cork, Department of Zoology.
    Chauvet, Eric
    Université de Toulouse.
    Dobson, Michael
    Manchester Metropolitan University.
    Elosegi, Arturo
    University of the Basque Country, Bilbao.
    Ferreira, Verónica
    University of Coimbra.
    Fleituch, Tadeusz
    Polish Academy of Sciences, Kraków.
    Gessner, Mark O.
    Swiss Federal Institute of Aquatic Science and Technology, Kastanienbaum.
    Giller, Paul S.
    University College Cork, Department of Zoology.
    Gulis, Vladislav
    Department of Life Sciences, University of Coimbra.
    Hutton, Stephen. A.
    University College Cork, Department of Zoology.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Lamothe, Sylvain
    Université de Toulouse.
    Lecerf, Antoine
    Université de Toulouse.
    Malmqvist, Björn
    Umeå University.
    McKie, Brendan G.
    Umeå University.
    Nistorescu, Marius
    University of Bucharest.
    Preda, Elena
    University of Bucharest.
    Riipinen, Miira P.
    Manchester Metropolitan University.
    Risnoveanu, Geta
    University of Bucharest.
    Schindler, Markus
    Swiss Federal Institute of Aquatic Science and Technology, Kastanienbaum.
    Tiegs, Scott D.
    Swiss Federal Institute of Aquatic Science and Technology, Kastanienbaum.
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Woodward, Guy
    University College Cork.
    Stream ecosystem functioning in an agricultural landscape: the importance of terrestrial-aquatic linkages2011Ingår i: Ecosystems in a human-modified landscape: a European perspective / [ed] Guy Woodward, San Diego: Academic Press, 2011, Vol. 44, s. 211-276Kapitel i bok, del av antologi (Refereegranskat)
    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.

  • 6. Islam, Kamal Ziaul
    et al.
    Islam, Md Sirajul
    North South University, Dhaka.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Low cost rainwater harvesting: an alternate solution to salinity affected coastal region of Bangladesh2014Ingår i: American Journal of Water Resources, ISSN 2333-4819, Vol. 2, nr 6, s. 141-148Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study investigated the prospect of rainwater harvesting as a low cost alternative potable water supply option along the coastal region of Bangladesh, which is considered as one of the most vulnerable countries in the world due to climate change and resulting sea level rise. Because of increasing salinity intrusion, potable water scarcity become severe at the south-western coastal region of the country. The study area for this investigation was Patkelghata in Satkhira district of Bangladesh located in the same zone. The Satkhira district averages nearly 1,710 mm rainfall per year. Based on rural housing pattern of the region, a rainwater harvesting system is proposed, which consists of roof catchment, gutters, down pipes, first flush devices, filter chamber and storage tank. The minimum catchment area was assumed to be 6 m2 and storage tank of 2000 liter capacity. Data was collected on the present state of freshwater supply, sources and quality, average rainfall in the region, dry spell period, family size, water use nature, rain water quality and material to be used for storage, etc. Rainwater quality was also tested and the parameters were found to be within Bangladesh’s standard limit. After a detail calculation, an approximate cost was assumed to be $171 for building and operation of the whole system. A questionnaire survey was also conducted on views and opinion of local people to understand the problems, prospects and the popularity of rainwater harvesting in Bangladesh.

  • 7. Lacoursière, Jean O.
    A laboratory study of fluid flow and microhabitat selection by larvae of Simulium vittatum (Diptera: Simuliidae)1992Ingår i: Canadian Journal of Zoology, ISSN 0008-4301, E-ISSN 1480-3283, Vol. 70, nr 3, s. 582-596Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Microhabitat selection by Simulium vittatum Zetterstedt larvae in a flume was studied at different mainstream velocities on two substrates; a thin flat plate parallel to the flow and a cylinder in cross flow. The results do not support the generally accepted assumptions that simuliid larvae keep within the boundary layer to avoid the direct influence of mainstream current and that they select the fastest velocity available when offered a longitudinal velocity gradient within their tolerance range. Instead, larvae gathered along the zone of boundary layer separation and remained along the stagnation line at the leading point of the cylinder when artificially positioned there. Further, under most conditions, larvae avoided zones of maximum surface shear stress. Larval reaction to hydraulic changes was immediate. It is hypothesized that S. vittatum larvae first scan the velocity profile at the substrate, initially moving toward increasing flow velocity (or water acceleration). They than cue on a steep velocity gradient along the body as part of the processes involved in choosing a location for suspension feeding.

  • 8.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Working together making Hoi An a green city - The CITYBLUES++ research platform...: turning climate adapted EcoCity development into action and business opportunities2013Konferensbidrag (Övrigt vetenskapligt)
  • 9. Lacoursière, Jean O.
    et al.
    Boisvert, JL
    Short-term Maintenance System for Black Fly Larvae (Diptera: Simuliidae)1987Ingår i: Journal of medical entomology, ISSN 0022-2585, E-ISSN 1938-2928, Vol. 24, nr 4, s. 463-466Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A simple, readily transportable apparatus for maintenance of black fly larvae in the laboratory is proposed as an alternative to a full-scale rearing system. This compact apparatus of the compressed-air type can maintain dense populations of black fly larvae without time-consuming manipulation. Large numbers of Simulium venustum Say complex, Simulium decorum Walker, and Prosimulium mixtum Syme & Davies group larvae (> 1,200 larvae per liter) were maintained successfully at low temperature in our laboratories for 3 – 5 mo. Mortality rates for mid- to late instars of each of the three species were <5%. Large areas of removable substrate allow easy access to larvae. This system can be used in the field to transport larvae to the laboratory, where they can be maintained or reared to the adult stage.

  • 10. Lacoursière, Jean O.
    et al.
    Charpentier, G
    Laboratory study of the influence of water temperature and pH on Bacillus thuringiensis var. israelensis efficacy against black fly larvae (Diptera: Simuliidae)1988Ingår i: Journal of the American Mosquito Control Association, ISSN 8756-971X, E-ISSN 1943-6270, Vol. 4, nr 1, s. 64-72Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An experimental formulation of Bacillus thuringiensis var. israelensis was used in the laboratory to assess the influence of water temperature and pH on the relationship between concentration, duration of exposure, and mortality of the northern black fly species Simulium decorum and Prosimulium mixtum/fuscum group. Mortality increases in both species with increases in duration of exposure, concentration, temperature and pH. Onset of death is shortened by increase in concentration and temperature. As temperature rises, the concentration of B. t. i required to induce mortality decreases; the sharpest decline occurring between 12 and 18 degree C for S. decorum , and between 4 and 8 degree C for P. mixtum/fuscum larvae. Lower pH induces a loss of efficacy of the B. t. i. formulation on S. decorum larvae at 4 and 12 degree C.

  • 11. Lacoursière, Jean O.
    et al.
    Craig, DA
    A small flume for studying the influence of hydrodynamic factors on benthic invertebrate behaviour1990Ingår i: Journal of The North American Benthological Society, ISSN 0887-3593, E-ISSN 1937-237X, Vol. 9, nr 4, s. 358-367Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A compact, versatile flume for studying the influence of hydrodynamic factors on the behaviour of benthic invertebrates is described. A range of lotic micro-environments can be simulated under controlled and replicable conditions by tailoring the velocity profile at the entrance of the test section. A specially designed diffuser composed of an array of adjustable horizontal rods allows tailored flow (e.g., zone of high shear stress, adjustable velocity gradient and turbulence level) to which organisms can be exposed. Water velocities of up to a maximum of 81.5 plus or minus 0.6 cm/s, with a turbulence intensity of 0.8% can be achieved. Simultaneous observations of flow and organism behaviours can be done by means of standard flow visualization techniques. Compact (72 cm long x 22 cm high x 10 cm wide; volume 10 L) and easily transportable, this flume is an inexpensive "desk-top" version of larger, more bulky systems, without sacrifice of performance and versatility.

  • 12. Lacoursière, Jean O.
    et al.
    Craig, DA
    Fluid transmission and filtration efficiency of the labral fans of black fly larvae (Diptera: Simuliidae): Hydrodynamic, morphological, and behavioural aspects1993Ingår i: Canadian Journal of Zoology, ISSN 0008-4301, E-ISSN 1480-3283, Vol. 71, nr 1, s. 148-162Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Body stance and water flow through the labral fans of suspension-feeding Simulium vittatum Zetterstedt larvae were examined using dead and live larvae. Transmission of flowing water through the fans were determined by means of dye injections. Feeding stance is the outcome of an active feedback process between flow forces and behavioural reactions that maintains the fans in an optimal filtering position. Fans responded to velocity increases through structural reconfiguration, which resulted in an increase in aperture size. As the velocity decreased, an increased fraction of the water directly approaching the fan aperture flowed around its perimeter, with no flow through the fans below 2.5 cm/s. Fluid transmission never exceeded 30-35%, even at velocities up to 50 cm/s. Calculations of suspension-feeding efficiency are reformulated to reflect labral fan transmission and behavioural components of the feeding process. Simulium vittatum larvae are consequently showed to be 4-26 times more efficient in filter feeding than has been previously assessed. The effect of flow on labral fan transmission is discussed in relation to known habitat choices and feeding behaviours of simuliid larvae.

  • 13. Lacoursière, Jean O.
    et al.
    Dahl, C
    Widahl, L E
    Use of the continuity principle to evaluate water processing rate of suspension-feeding mosquito larvae1999Ingår i: Journal of the American Mosquito Control Association, ISSN 8756-971X, E-ISSN 1943-6270, Vol. 15, nr 2, s. 228-237Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Water processing rates of active suspension-feeding larvae of Culiseta morsitans and Cities quinquefasciatus 2nd and 4th instars were estimated through video image analysis of the conical jet flow driving the large recirculation patterns surrounding the organisms. In accordance with the principle of continuity, individual processing rates (PRs) were assessed by averaging a series of consecutive flow rates (Q(x)) defined as the product of the water velocity (U-x) and the associated cross-sectional area (A(x)) along a transect passing through the center of the delineated jet flow. Results clearly show very tight adherence to the principle of continuity. They also demonstrate that, although extreme care must be taken when streamtube delineation is performed, the methodology used can generate reliable assessment of individual processing rates regardless of the instars or species studied. The small coefficient of variation observed in assessing PR at the larval level further underlines the consistency of the method. Significant differences in water processing rates were observed for different species and instars. These could partially be related to body size, head width, and the length of the lateral palatal brushes (LPBs, which are the structures involved in the production of the water jet. Assessment of the jet velocity at the feeding groove level suggests the keg role of LPB beating frequency in the jet intensity, and consequently the magnitude of the processing rate. Analysis of data further indicates that obligate suspension feeders such as Cs. morsitans must sustain a larger flow pattern around the larvae to ensure sufficient particle entrapment than facultative suspension feeders (or even brushers) such as Cs. quinquefasciatus.

  • 14.
    Lacoursière, Jean O.
    et al.
    Lunds universitet.
    Heintzenberg, F.
    Effects of enhanced UV-A and UV-B radiation on dispersal and drift behaviour of blackfly larvae (Simulium vittatum): preliminary data2001Ingår i: International Association of Theoretical and Applied Limnology: 27th congress. Part 4, 2001, s. 2024-2029Konferensbidrag (Refereegranskat)
  • 15.
    Lacoursière, Jean O.
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Creating citywide water-energy-food nexus opportunities: FSM as driving force2014Ingår i: From faecal sludge to fuel: safe sanitation with business opportunities (workshop), 2014Konferensbidrag (Övrigt vetenskapligt)
  • 16.
    Lacoursière, Jean O.
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Measuring residence time distribution in a vegetated pond2015Konferensbidrag (Övrigt vetenskapligt)
  • 17.
    Lacoursière, Jean O.
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    The challenges of keeping floodplains and wetlands in rapidly growing cities: lessons learnt from 24 years of observing Vientiane, Lao PDR2014Konferensbidrag (Övrigt vetenskapligt)
  • 18.
    Lacoursière, Jean O.
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Toilets need allies - breaking down silo thinking for decentralized sanitation2015Konferensbidrag (Övrigt vetenskapligt)
  • 19. Mark, O.
    et al.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Amena, Z.
    Babel, M. S.
    Application of hydroinformatics tools for water quality modeling and management: case study of Vientiane, Lao PDR2010Ingår i: Journal of Hydroinformatics, ISSN 1464-7141, E-ISSN 1465-1734, Vol. 12, nr 2, s. 161-171Artikel i tidskrift (Refereegranskat)
    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.

  • 20.
    Minh Tran, Thao
    et al.
    Vietnam.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Thanh Doan, Phuong
    Vietnam.
    Van Tran, Man
    Vietnam.
    Capacity of Vitiver grass in treatment of a mixture of labaratory and domestic wastewaters2015Konferensbidrag (Övrigt vetenskapligt)
    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.

  • 21. Tessier, L
    et al.
    Boisvert, J L
    Vought, Lena B. M.
    Lunds universitet.
    Lacoursière, Jean O.
    Lunds universitet.
    Anomalies on capture nets of Hydropsyche slossonae larvae (Trichoptera; Hydropsychidae) following a sublethal chronic exposure to cadmium2000Ingår i: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 108, nr 3, s. 425-438Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A laboratory study on the sublethal effects of cadmium (Cd) on the net-spinning process of the larvae of Hydropsyche slossonae was conducted in order to assess the potential of net anomalies as an indicator of chronic exposure to Cd. Two major anomalies with different frequency levels were identified after chronic exposure to 0.37, 1.2, 11.6, 21.4 and 43.3 μg l−1 of Cd. The first was a distortion of the midline meshes where the diamond-shape structure is disrupted and the meshes are separated by extra strands (called ‘midline’ anomaly). The second aberration consisted of a distortion of the rectilinear structure of net opening by strands being fused or added over the meshes (called ‘crossover’ anomaly). The midline distortion may be linked to a physiological stress caused by Cd, which can affect the control of the net-spinning process. It was not possible to relate the crossover aberrations to a specific toxic action of Cd, but data indicated that both anomalies are independent from each other and that two modes of action could be implicated. Protein analyses of capture nets have revealed silk polypeptide modifications at the highest Cd concentration tested, indicating a possible effect of Cd interaction with silk proteins. However, neither a gradient-concentration nor a time-dependent response could be established with both aberration frequencies. Silk protein modifications would rather play a secondary role in the appearance of both net anomalies, and mostly at a high concentration level. Finally, the toxicity curves (EC50) show that the sensitivity threshold for both types of aberration ranged from 1 to 5 μg l−1 which is highly sensitive compared with other sublethal effects of Cd on other macroinvertebrate species. Hence, the use of capture-net anomalies of hydropsychid larvae would represent a valuable indicator of sublethal toxicity induced by Cd and possibly by other metals in running waters.

  • 22. Tessier, L
    et al.
    Boisvert, J L
    Vought, Lena B. M.
    Lunds universitet.
    Lacoursière, Jean O.
    Lunds universitet.
    Effects of 2,4-dichlorophenol on the net-spinning behavior of Hydropsyche slossonae larvae (Trichoptera; Hydropsychidae), an early warning signal of chronic toxicity2000Ingår i: Ecotoxicology and Environmental Safety, ISSN 0147-6513, E-ISSN 1090-2414, Vol. 46, nr 2, s. 207-217Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In order to assess the potential of hydropsychid capture net anomalies as a bioindicator of chronic toxicity in streams and rivers, the effects of 2,4-dichlorophenol (2,4-DCP) exposure on the net-spinning behavior of Hydropsyche slossonae were examined for anomalies after 0, 5, 10, 15, and 20 exposure days to gradient concentration of 2,4-dichlorophenol. The net-spinning behavior was significantly affected when larvae were exposed to 1.0, 10, 25, and 50 μg·L−1, as expressed by the occurrence of two distinct abnormalities. The first one was a distortion of the midline meshes, where the normal diamond-shape structure is disrupted and the meshes are separated by extra strands (called “midline” anomaly). The second aberration observed was called “chaotic” net, where the nets are highly irregular without any real structure or well-defined areas. A good correlation was found between the chaotic net frequencies and the reduction of ATP concentrations in the larvae, indicating possible uncoupling effects of 2,4-DCP on the oxidative phosphorylation process. Toxicity curves demonstrate that the sensitivity threshold of chaotic net frequencies ranged from 3.5 to 7 μg·L−1, which is highly sensitive compared with other sublethal effects of 2,4-DCP on other aquatic species.

  • 23. Tessier, Louis
    et al.
    Boisvert, Jacques L.
    Vought, Lena B. M.
    Lunds universitet.
    Lacoursière, Jean O.
    Lunds universitet.
    Anomalies on capture nets of Hydropsyche slossonae larvae (Trichoptera; Hydropsychidae), a potential indicator of chronic toxicity of malathion (organophosphate insecticide)2000Ingår i: Aquatic Toxicology, ISSN 0166-445X, E-ISSN 1879-1514, Vol. 50, nr 1-2, s. 125-139Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A laboratory study on the sublethal effects of malathion on the net-spinning behavior of the caddisfly larvae Hydropsycheslossonae was conducted in order to assess the potential of net anomalies as an indicator of chronic exposure to organophosphorus insecticides. Two anomalies were identified after chronic exposure to 0.01, 0.05, 0.1, 0.5 and 1.0 μg l−1 malathion. The first was a distortion of the midline meshes where the normal diamond shape structure was disrupted and the meshes were separated by extra strands (called ‘midline’ anomaly). The second aberration observed was a significant decrease in net symmetry. Both anomalies were highly correlated to the toxic action of malathion, i.e. inhibition of the acetylcholinesterase enzyme (AChE). Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analyses of capture nets did not show any modification of silk polypeptides after exposure to malathion, indicating that net distortions were not related to silk composition. Both anomalies seem to represent the symptoms of the specific toxic action of malathion; nevertheless, they can serve as an index of the physiological condition of the larvae, especially the midline anomaly. The symmetry of the nets decreased significantly after exposure to 0.5 and 1.0 μg l−1. However, the toxicity curves (EC50) showed that the sensitivity threshold for the midline anomaly ranged from 0.11 to 0.28 μg l−1, which reflect more realistic exposure to concentrations expected to occur in the field. Hence, the use of capture net anomalies of hydropsychid larvae could represent a valuable indicator of sublethal toxicity induced by malathion and other organophosphorus insecticides in running waters.

  • 24. Tessier, Louis
    et al.
    Boisvert, Jacques L.
    Vought, Lena B. M.
    Lunds universitet.
    Lacoursière, Jean O.
    Lunds universitet.
    Characterization of Hydropsyche slossonae (Trichoptera: Hydropsychidae) capture net polypeptides2000Ingår i: Canadian Entomologist, ISSN 0008-347X, E-ISSN 1918-3240, Vol. 132, nr 1, s. 59-68Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A laboratory study on the sublethal effects of malathion on the net-spinning behavior of the caddisfly larvae Hydropsycheslossonae was conducted in order to assess the potential of net anomalies as an indicator of chronic exposure to organophosphorus insecticides. Two anomalies were identified after chronic exposure to 0.01, 0.05, 0.1, 0.5 and 1.0 μg l−1 malathion. The first was a distortion of the midline meshes where the normal diamond shape structure was disrupted and the meshes were separated by extra strands (called ‘midline’ anomaly). The second aberration observed was a significant decrease in net symmetry. Both anomalies were highly correlated to the toxic action of malathion, i.e. inhibition of the acetylcholinesterase enzyme (AChE). Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analyses of capture nets did not show any modification of silk polypeptides after exposure to malathion, indicating that net distortions were not related to silk composition. Both anomalies seem to represent the symptoms of the specific toxic action of malathion; nevertheless, they can serve as an index of the physiological condition of the larvae, especially the midline anomaly. The symmetry of the nets decreased significantly after exposure to 0.5 and 1.0 μg l−1. However, the toxicity curves (EC50) showed that the sensitivity threshold for the midline anomaly ranged from 0.11 to 0.28 μg l−1, which reflect more realistic exposure to concentrations expected to occur in the field. Hence, the use of capture net anomalies of hydropsychid larvae could represent a valuable indicator of sublethal toxicity induced by malathion and other organophosphorus insecticides in running waters.

  • 25. Voelz, Neal J.
    et al.
    Vought, Lena B. M.
    Lunds universitet.
    Lacoursière, Jean O.
    Lunds universitet.
    The distribution and abundance of hyporheic invertebrates in a small Swedish stream2006Ingår i: International Association of Theoretical and Applied Limnology, Vol 29, Pt 4, Proceedings, 2006, s. 1777-1781Konferensbidrag (Refereegranskat)
  • 26. Vought, Lena B. M.
    et al.
    Dahl, J
    Pedersen, CL
    Lacoursière, Jean O.
    Nutrient retention in riparian ecotones1994Ingår i: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 23, nr 6, s. 342-348Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nutrient retention mechanisms in riparian buffer strips are reviewed with emphasis on surface runoff and subsurface flows, the main pathways of exchanges between the stream and its surroundings. Unique physical and biogeochemical properties prevailing in these riparian ecotones dictate the flux of water, nutrients and other exogenous substances between the upland areas and the stream. Removal of nutrients from surface inflows is induced by deposition of sediment bound nutrients and exchange of dissolved nutrients with the soil/litter surface. Removal of nitrogen in subsurface flows can partly be explained by vegetation uptake, but the main mechanism for removal is usually denitrification. In channelized streams, the subsurface inflows have, in most cases, been altered to discharges via drainage tiles, with the exchange flows (water leaving and re-entering the open-channel via the stream bed and banks) being greatly decreased. Consequently, to improve nitrogen removal in these systems, these flows have to be intercepted or reestablished either through restoration of the old stream valley or through managed structures in the buffer strips.

  • 27. Whelan, M. J.
    et al.
    Van Egmond, R.
    Guymer, I.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Finnegan, C.
    Fox, K. K.
    Sparham, C.
    O'Connor, S.
    Vaughan, M.
    Pearson, J. M.
    The behaviour of linear alkyl benzene sulphonate under direct discharge conditions in Vientiane, Lao PDR2007Ingår i: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 41, nr 20, s. 4730-4740Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Direct discharge of untreated sewage to surface waters is a common practice in many parts of the world. However, relatively little is known about the behaviour of synthetic organic pollutants under these conditions. This paper describes a sampling campaign designed to track changes in water quality in a surface water system in Vientiane (Lao PDR) receiving significant quantities of untreated waste water. The study was based on following in-channel transport using a fluorescent tracer injected as a pulse, with a focus on the anionic surfactant linear alkylbenzene sulphonate (LAS) and ammonia. Water samples were collected at a number of stations with sampling times estimated to coincide with solute time-of-travel. The reduction in LAS concentration with flow-time could be approximated by first-order kinetics with a half life of about 7 h. Free ammonia concentrations decreased more slowly than LAS and remained above the level believed to be toxic for sensitive aquatic species along the entire channel. Changes in the ratios of LAS alkyl chain homologues to total LAS concentrations suggest a preferential removal of longer chain lengths. The role of biodegradation in the removal of LAS was confirmed by the presence of LAS metabolites (sulphophenylcarboxylates, SPCs) which increased systematically (as a fraction of LAS remaining) with flow-time.

  • 28.
    Woodward, Guy
    et al.
    Department of Zoology, Ecology and Plant Science, University College Cork.
    Gessner, Mark O.
    Department of Aquatic Ecology, Eawag.
    Giller, Paul S.
    Department of Zoology, Ecology and Plant Science, University College Cork.
    Gulis, Vladislav
    Institute of Marine Research (IMAR) and Department of Life Sciences, University of Coimbra.
    Hladyz, Sally
    Department of Zoology, Ecology and Plant Science, University College Cork.
    Lecerf, Antoine
    Université de Toulouse.
    Malmqvist, Björn
    Department of Ecology and Environmental Science, Umeå University.
    McKie, Brendan G.
    Department of Ecology and Environmental Science, Umeå University.
    Tiegs, Scott D.
    Department of Aquatic Ecology, Eawag.
    Cariss, Helen
    Department of Environmental and Geographical Sciences, Manchester Metropolitan University.
    Dobson, Mike
    Department of Environmental and Geographical Sciences, Manchester Metropolitan University.
    Elosegi, Arturo
    Department of Plant Biology and Ecology, Faculty of Science and Technology, University of the Basque Country, Bilbao.
    Ferreira, Verónica
    Institute of Marine Research (IMAR) and Department of Life Sciences, University of Coimbra.
    Graça, Manuel A.S.
    Institute of Marine Research (IMAR) and Department of Life Sciences, University of Coimbra.
    Fleituch, Tadeusz
    Institute of Nature Conservation, Polish Academy of Sciences, Kraków.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Nistorescu, Marius
    Department of Systems Ecology and Sustainability, University of Bucharest.
    Pozo, Jesús
    Department of Plant Biology and Ecology, Faculty of Science and Technology, University of the Basque Country, Bilbao.
    Risnoveanu, Geta
    Department of Systems Ecology and Sustainability, University of Bucharest.
    Schindler, Markus
    Department of Aquatic Ecology, Eawag.
    Vadineanu, Angheluta
    Department of Systems Ecology and Sustainability, University of Bucharest.
    Vought, Lena B. M.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Chauvet, Eric
    Université de Toulouse.
    Continental-scale effects of nutrient pollution on stream ecosystem functioning2012Ingår i: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 336, nr 6087, s. 1438-1440Artikel i tidskrift (Refereegranskat)
    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.

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