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See detailImpact of climate change on groundwater reserves
Goderniaux, Pascal ULg

Doctoral thesis (2010)

Estimating the impacts of climate change on groundwater represents one of the most difficult challenges faced by water resources specialists. One difficulty is that simplifying the representation of the ... [more ▼]

Estimating the impacts of climate change on groundwater represents one of the most difficult challenges faced by water resources specialists. One difficulty is that simplifying the representation of the hydrological system, or using too simple climate change scenarios often leads to discrepancies in projections. Additionally, these projections are affected by uncertainties from various sources, and these uncertainties are not evaluated in previous studies. In this context, the objective of this study is to provide an improved methodology for the estimation of climate change impact on groundwater reserves, including the evaluation of uncertainties. This methodology is applied to the case of the Geer basin catchment (480 km²) in Belgium. A physically-based surface-subsurface flow model has been developed for the Geer basin with the finite element model HydroGeoSphere. The simultaneous solution of surface and subsurface flow equations in HydroGeoSphere, as well as the internal calculation of the actual evapotranspiration as a function of the soil moisture at each node of the defined evaporative zone, improve the representation and calibration of interdependent processes like recharge, which is crucial in the context of climate change. Fully-integrated surface-subsurface flow models have recently gained attention, but have not been used in the context of climate change impact studies. This surface-subsurface flow model is combined with advanced climate change scenarios for the Geer basin. Climate change simulations were obtained from six regional climate model (RCM) scenarios assuming the SRES A2 greenhouse gases emission (medium-high) scenario. These RCM scenarios were statistically downscaled using two different methods: the 'Quantile Mapping Biased Correction' technique and a 'Weather Generator' technique. Both of them are part of the most advanced downscaling techniques. They are able to apply corrections not only to the mean of climatic variables, but also across the statistical distributions of these variables. This is important as these distributions are expected to change in the future, with more violent rainfall events, separated by longer dry periods. The 'quantile mapping bias-correction' technique generate climate change time series representative of a stationary climate for the periods 2011-2040, 2041-2070 and 2071-2100. The 'CRU' weather generator is used to generate a large number of equiprobable scenarios simulating full transient climate change between 2010 and 2085. All these scenarios are applied as input of the Geer basin model. The uncertainty is evaluated from different possible sources. Using a multi-model ensemble of RCMs and GCMs enables to evaluate the uncertainty linked to climatic models. The application of a large number of equiprobable climate change scenarios, generated with the 'weather generator', as input of the hydrological model allows assessing the uncertainty linked to the natural variability of the weather. Finally, the uncertainty linked to the calibration of the hydrological model is evaluated using the computer code 'UCODE_2005'. The climate change scenarios for the Geer basin model predict hotter and drier summers and warmer and wetter winters. Considering the results of this study, it is very likely that groundwater levels and surface flow rates in the Geer basin will decrease. This is of concern because it also means that groundwater quantities available for abstraction will also decrease. However, this study also shows that the uncertainty surrounding these projections is relatively large and that it remains difficult to state on the intensity of the decrease. [less ▲]

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See detailImpact of Climate change on inundation hazard along river Meuse
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2010, December 16)

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See detailImpact of climate change on inundation hazard along the river Meuse
Dewals, Benjamin ULg; Drogue, Gilles; Erpicum, Sébastien ULg et al

in Transboundary Water Management in a Changing Climate (2013, March)

As a part of the effort to scientifically inform the development of the adaptation strategy for the Meuse basin, we detail hereafter the generation of integrated climate and hydrological scenarios for the ... [more ▼]

As a part of the effort to scientifically inform the development of the adaptation strategy for the Meuse basin, we detail hereafter the generation of integrated climate and hydrological scenarios for the whole basin. We also present the setup of a first coordinated hydraulic modelling from spring to mouth of the river Meuse. The latter has enabled to compute the range of change in inundation hazard under the “wet” transnational hydrological scenario for the time slices 2021-2050 and 2071-2100. A significantly higher impact of climate change has been found in the middle part of the Meuse basin, compared to the upper and the lower parts. These conclusions have been further confirmed by a refined analysis conducted for a 100 km-long stretch of the river Meuse crossing the Belgian-Dutch border. [less ▲]

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See detailImpact of climate change on potential evapotranspiration under a historical and future climate scenario in the Huang-Huai-Hai Plain, China
Liu, Qin; Yan, Changrong; Ju, Hui et al

in Theoretical & Applied Climatology (in press)

Climate change is widely accepted to be one of the most critical problems faced by the Huang-Huai-Hai Plain (3H Plain), which is a region in which there is an over-exploitation of groundwater region and ... [more ▼]

Climate change is widely accepted to be one of the most critical problems faced by the Huang-Huai-Hai Plain (3H Plain), which is a region in which there is an over-exploitation of groundwater region and where future warmer and drought conditions might intensify crop water demand. In this study, the spatiotemporal patterns of ET0 and primary driving meteorological variables were investigated based on a historical and RCP 8.5 scenario daily data set from 40 weather stations over the 3H Plain using linear regression, spline interpolation method, a partial derivative analysis and multivariate regression. The results indicated a negative trend in all the analysis periods (except spring) of the past 54 years of which only summer and the entire year were statistically significant (p < 0.01) with slopes of -1.09 and -1.30 mm·a-1 respectively. In contrast, a positive trend was observed in all four seasons and the entire year under the RCP 8.5 scenario, with the biggest increment equal to 1.36 mm·a-1 in summer and an annual increment of 3.37 mm·a-1. The spatial patterns of the seasonal and annual ET0 exhibited the lowest values in southeastern regions and the highest values in northeastern parts of Shandong Province, probably because of the combined effects of various meteorological variables over the past 54 years. Relative humidity (RH) together with solar radiation (RS) were detected to be the main climatic factors controlling the reduction of ET0 in summer, autumn, and the entire year on the 3H Plain. ET0 in spring was mainly sensitive to changes in RS and RH, whereas ET0 in winter was most sensitive to changes in wind speed (WS) and decreased due to declining RH. Under the future RCP 8.5 scenario, the annual ET0 distribution displays a rich spatial structure with a clear northeast-west gradient and anarea with low values in the southern regions, which is similarly detected in spring and summer. The most sensitive and primary controlling variables with respect to the increment of future ET0 are in the first place RS and then mean temperature in spring, while turn to be mean temperature and then RS in summer. In autumn, future ET0 is most sensitive to RH changes. WS and RH are the controlling variables for ET0 in winter. Annual future ET0 is most sensitive to RH changes and accordingly RS is responsible for the predicted increment of the annual ET0. Better understanding of current and future spatiotemporal patterns of ET0 and of the regional response of ET0 to climate change can contribute to the establishment of a policy to realize a more efficient use of water resources and a sustainable agricultural production in the 3H Plain. [less ▲]

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See detailImpact of climate change on water & society
Ozer, Pierre ULg

Conference given outside the academic context (2010)

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See detailImpact of Climate Change on “Aphid - Natural Enemies” Relationship
Boullis, Antoine ULg; Oostrom, Marjolein; Francis, Frédéric ULg et al

Poster (2014, December 12)

While the effects of global atmospheric changes on vegetation and associated insect populations (bottom-up interactions) are increasingly studied, how these gases affect the interactions between insects ... [more ▼]

While the effects of global atmospheric changes on vegetation and associated insect populations (bottom-up interactions) are increasingly studied, how these gases affect the interactions between insects and their natural enemies (top-down interactions) is less clear. As the efficacy of natural enemies is governed largely by behavioral mechanisms, changes in their prey-seeking behavior or the behavior of insect prey defenses can change the dynamics of insect populations. The impact of increases in atmospheric carbon dioxide concentrations on aphid population dynamic is well documented. However, nothing about their chemical ecology is reported in the literature. Aphids are using many chemical signals to communicate with each other or with their environment. For example aphids produce an alarm pheromone to signal the presence of a natural enemy (such as a predator or a parasitoid) in the colony. Moreover, this pheromone is used by natural enemies as a kairomone to locate aphid prey, and is thus at the center of aphid – natural enemies interactions. In this study, the impact of elevated CO2 concentration on the emission of the alarm pheromone in the aphid A. pisum is studied. Using a zNoseTM (Gas chromatograph enabling the fast analyze of the chemical composition of a sample), the kinetic of the EBF emission in real-time is set up for a single individual predated by a coccinellid predator Harmonia axyridis Pallas. This experimentation is done both for aphids reared under ambient atmospheric conditions and for individuals reared under elevated CO2 concentrations. We present the differences in terms of emission dynamic and discuss the potential of these results in terms of biological control. [less ▲]

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See detailImpact of climatic conditions on a winter wheat (Triticum aestivum Sp.) crop : interannual variability of CO2 fluxes, plant growth and crop yield
Dufranne, Delphine ULg; Vancutsem, Françoise ULg; Moureaux, Christine ULg et al

Poster (2008, September)

This study analyses the interannual variability of carbon dioxide fluxes, growth and productivity of a winter wheat (Triticum aestivum L.) crop. Two growing seasons (2004-2005 and 2006-2007) were compared ... [more ▼]

This study analyses the interannual variability of carbon dioxide fluxes, growth and productivity of a winter wheat (Triticum aestivum L.) crop. Two growing seasons (2004-2005 and 2006-2007) were compared. Continuous eddy covariance fluxes, leaf scale photosynthesis measurements and crop development monitoring were performed during the two vegetation seasons until harvest at the Lonzée (Belgium) experimental site. The winter wheat was sown and harvested at similar dates (about mid-October and in early August); crop management by the farmer was similar and corresponded at standard. Globally, the two years were characterised by a higher than normal air temperature (9.9 °C and 11.9 °C against 9.4 °C) and lower than normal rainfalls (595.1 mm and 675.1 mm against 772 mm). In addition, 2006-2007 was characterised by exceptionally mild and dry winter and spring. This induced not only earlier growth stages but also a larger Gross Primary Productivity. On the contrary, lower Net Primary Productivity and crop productivity were observed on this year. This could be explained, on one hand by the drought in April 2007 and on the other hand to cloudy and humid conditions from end May to harvest. The first induced a stress in wheat plant which produced an unusually small flag leaf. The second induced an assimilation reduction due to low radiation and favoured disease development. The higher GPP and the lower productivity in 2006-2007 raise the question of carbon allocation. We supposed that, as the excess of carbon assimilated in 2006-2007 was not stored in grain or straw, it should have been stored in the roots. However, our biomass measurements did not allow confirming this hypothesis [less ▲]

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See detailImpact of climatic factors on the release of E-β-caryophyllene from alginate beads
Daems, Frédéric ULg; Bera, François ULg; Lorge, Stéphanie ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2016), 20(2),

Description of the subject. Alginate beads that release semiochemical compounds are interesting biological control devices used to attract the natural enemies of aphids in infested crops. Little ... [more ▼]

Description of the subject. Alginate beads that release semiochemical compounds are interesting biological control devices used to attract the natural enemies of aphids in infested crops. Little information, however, is available about the impact of climatic factors on the release of semiochemicals from this diffusive system. Objectives. The objective of this scoping study was to investigate the impact of temperature, relative humidity and wind speed, on the release of E-β-caryophyllene from alginate beads. Method. The impact of the three climatic factors on the release of E-β-caryophyllene from alginate beads was evaluated using a Box-Behnken experimental design and a laboratory scale volatile collection system. The influence of relative humidity on bead water content and size, with and without this semiochemical, was also investigated using a gravimetric method and an easy-to-use photographic device, respectively. Results. The results showed that an increase in temperature caused a significant increase in the E-β¬-caryophyllene release rate. Neither relative humidity nor airflow, however, had a significant effect on the release of this semiochemical when relative humidity and wind speed ranged from 33% to 75% and from 6.61 x10-4 m.s-1 to 2.05 x10-2 m.s-1, respectively. The isotherm curves obtained were characteristic of food products and biopolymer materials. The isotherm shapes were not modified by the incorporation of the semiochemical into alginate beads, and showed an important increase in water content when relative humidity values exceeded 85%. Fortunately, this water content increase did not affect bead size, which facilitates the calculation of E-β-caryophyllene release. Conclusion. The present study shows for the first time the impact of the three main climatic factors on the release of E-β-caryophyllene from alginate beads. It allows learning more about how these biological control devices operate in order to optimize future field trials. [less ▲]

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See detailImpact of close habitat on the entomological diversity and abundance in carrot open fields.
Colignon, P.; Gaspar, Charles ULg; Haubruge, Eric ULg et al

in Mededelingen van de Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen (Rijksuniversiteit te Gent) (2002), 67(3), 481-6

Vegetable open fields areas have been increasing for the last decade in Wallonia (South part of Belgium), mainly in Hesbaye. To be in accordance with quality standards, especially in terms of agrochemical ... [more ▼]

Vegetable open fields areas have been increasing for the last decade in Wallonia (South part of Belgium), mainly in Hesbaye. To be in accordance with quality standards, especially in terms of agrochemical residues (R.M.L.), biological pest control was developed and reduces the insecticide use, leading to have safer fresh products. Carrot represents an important cultivated species in Wallonia. To asses the impact of close habitat on both pest (mainly aphids) and beneficial insects, carrot fields were investigated during all the production duration in 2000. Twelve fields between Waremme and Hannut were visited weekly from June to October. Insects were caught using yellow traps and determined to the family level. Approximately 90,000 insects belonging to 109 families were identified. Significant differences linked to field closed habitat were observed on 31 families. An increase of biodiversity in term of family number near set-asides and woody borders was observed. Evaluation of pest and beneficial diversity and density in vegetable crops was discussed to promote future IPM program. [less ▲]

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See detailImpact of closed habitat on the entomological diversity and abundance in carrot open fields
Colignon, Pierre; Gaspar, Charles; Haubruge, Eric ULg et al

in Med. Fac. Landbouw. Univ. Gent (2002), 67(3), 481-486

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See detailThe impact of cognitive reserve on recognition memory performance is dependent of the task format in healthy aging
Simon, Jessica ULg; Gilsoul, Jessica ULg; Bastin, Christine ULg

Poster (2016, March 17)

Objective: According to the cognitive reserve hypothesis (Stern, 2009), individuals who have developed a high level of reserve should resist better to the effects of aging than individuals with lower ... [more ▼]

Objective: According to the cognitive reserve hypothesis (Stern, 2009), individuals who have developed a high level of reserve should resist better to the effects of aging than individuals with lower cognitive reserve. In this study, we identified the factors of cognitive reserve that impact most memory performance in aging. Methods: 118 healthy older participants performed one yes/no recognition task and one 3-alternative forced-choice recognition task. For each recognized item, participants provided a Remember/Know/Guess judgment. Furthermore, participants completed a questionnaire assessing different aspects of cognitive reserve (level of education, occupation, physical, social, cultural and intellectual activities). We determined the moderators of cognitive reserve that explain a significant proportion of variance for each memory index through stepwise regression analyzes (p<0.05). Results: In the forced-choice test, the level of education explained positively the use of recollection and negatively the level of false alarms associated with familiarity. In the yes/no recognition task, the precision of recognition was explained positively by the physical activities. Recollection was positively explained by the physical activities and the level of education. Finally, the level of false alarms associated with familiarity was explained negatively by the level of education although the precision of the use of the familiarity is explained positively by physical activities. Conclusion: The more older adults were educated and/or were practicing physical activities, the better their recollection was. The impact of the moderators of the cognitive reserve is dependent on the format of the recognition task. [less ▲]

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See detailThe impact of complete revascularization on long-term survival is strongly dependent on age
Girerd, N.; Magne, Julien ULg; Rabilloud, M. et al

in Annals of Thoracic Surgery (2012), 94(4), 1166-1172

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See detailThe Impact of Complexity on Sentence Comprehension in Children with Specific Language Impairment
Leclercq, Anne-Lise ULg; Majerus, Steve ULg; Jacob, Laura et al

Poster (2012, June)

In recent years, there has been growing evidence that children with specific language impairment (SLI) show poor sentence comprehension performance. However, factors determining sentence comprehension in ... [more ▼]

In recent years, there has been growing evidence that children with specific language impairment (SLI) show poor sentence comprehension performance. However, factors determining sentence comprehension in SLI remain unclear. Limited processing capacities have been suggested as a potential cause of their syntactic problem (Ellis Weismer & Hesketh, 1996; Montgomery, 2000), but this hypothesis has not been directly addressed by manipulating inner sentence complexity. This study aims at investigating the limited capacity theory of language impairment in a sentence comprehension task, by manipulating various aspects of inner sentence complexity, as defined by the Capacity Constrained Comprehension theory (Just & Carpenter, 1992). Fifteen children with SLI, 15 age-and-IQ-matched controls, and 15 controls matched for receptive lexical and grammatical abilities performed an auditory sentence comprehension task in which lexical frequency, sentence length, and the type of relative clause (subject- or object-relativized clauses) were manipulated. Results showed a main effect of group (F(2,42)=25.40, p<.001): children with SLI performed worse than language-matched and age-matched control groups. Main effects of relative clause type (F(1,42)=198.37, p<.001) and sentence length (F(1,42)=46.29, p<.001) were also found, showing overall better performances for sentences with a subject rather than an object relative clause and for short rather than long sentences. However, the SLI group was affected to the same extent by these variables as the control groups. At the same time, a significant group-by-frequency interaction effect was found (F(2,42)=4.03, p<.05), revealing that only the SLI group showed poorer sentence comprehension performance for sentences containing low frequency words. These data confirm the severity and specificity of sentence comprehension difficulties in children with SLI (e.g., van der Lely 2005). Given that our SLI group showed impaired sentence comprehension performance relative to younger children performing at the same level on a standardized test of grammatical comprehension, it appears that processing full reversible relative clauses is especially difficult for children with specific language impairment. Moreover, SLI children’s sentence comprehension abilities are particularly affected by the presence of low frequency but familiar words, even when compared to children matched on vocabulary knowledge. [less ▲]

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See detailImpact of components of the metabolic syndrome on knee osteoarthritis progression in the SEKOIA study
Eymard, F; Edwards, M; Parsons, C et al

in Osteoarthritis and Cartilage (2014), 22(1), 376

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See detailImpact of components of the metabolic syndrome on progression of knee osteoarthritis in the SEKOIA study
Edwards, MH; Parsons, C; Eymard, F et al

in Rheumatology (2014), 53(1), 31

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See detailImpact of components of the metabolic syndrome on progression of knee osteoarthritis in the Sekoia study
Parsons, C; Edwards, MH; Eymard, F et al

in Osteoporosis International (2014), 25(2), 230

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See detailThe impact of concomitant rhinitis on asthma-related quality of life and asthma control.
Vandenplas, O.; Dramaix, M.; Joos, G. et al

in Allergy (2010)

To cite this article: Vandenplas O, Dramaix M, Joos G, Louis R, Michils A, Verleden G, Vincken W, Vints A-M, Herbots E, Bachert C. The impact of concomitant rhinitis on asthma-related quality of life and ... [more ▼]

To cite this article: Vandenplas O, Dramaix M, Joos G, Louis R, Michils A, Verleden G, Vincken W, Vints A-M, Herbots E, Bachert C. The impact of concomitant rhinitis on asthma-related quality of life and asthma control. Allergy 2010; DOI: 10.1111/j.1398-9995.2010.02365.x. Abstract Background: Characterizing the interactions between the upper and lower airways is important for the management of asthma. This study aimed at assessing the specific impact of concomitant rhinitis on asthma-related quality of life (QOL) and asthma control. Methods: A cross-sectional, observational survey was conducted among 1173 patients with asthma (aged 12-45) recruited by general practitioners and chest physicians. AR was defined by self-reported rhinitis symptoms and previously documented sensitization to inhalant allergens. The primary outcomes were (1) asthma control assessed by the Asthma Control Questionnaire (ACQ) and (2) asthma-specific QOL evaluated through the Mini Asthma Quality of Life Questionnaire (mAQLQ). Results: AR was present in 73.9% of the population with asthma and nonallergic rhinitis (NAR) in 13.6%. AR and NAR were associated with an increased risk of uncontrolled asthma (i.e. ACQ score > 1.5) with adjusted odds ratios (OR) of 2.00 (95% confidence interval [CI]: 1.35-2.97) and 1.77 (95%CI: 1.09-2.89), respectively. Multivariate linear regression analysis showed that AR and NAR had a modest, although significant, negative impact on the global mAQLQ score (beta coefficient: -0.293, standard error [SE]: 0.063 and beta coefficient: -0.221, SE: 0.080, P < 0.001, respectively), even after adjustment for the level of asthma control and demographic characteristics. Conclusion: This survey provides direct evidence that AR and NAR are associated with an incremental adverse impact on the disease-specific QOL of patients with asthma and the level of asthma control. Further investigations are required to determine whether appropriate treatment of rhinitis would efficiently reduce asthma morbidity. [less ▲]

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See detailImpact of contaminants on thyroid and immune system of harbour porpoise (Phocoena phocoena) from the Northeast Atlantic
Das, Krishna ULg; Siebert, Ursula

Poster (2004, May)

This Marie-Curie project integrates in the research framework of transport pathway and impact of pollutant studies in the marine ecosystem and aims to understand the effects of some pollutants on the ... [more ▼]

This Marie-Curie project integrates in the research framework of transport pathway and impact of pollutant studies in the marine ecosystem and aims to understand the effects of some pollutants on the general health status, the endocrine and immune systems of the harbour porpoise (Phocoena phocoena). Pollutants such as trace metals, or organochlorines which have been recognised to have endocrine or immune disrupting effects on other species will be examined. These investigations will examine if some endocrine and immune functions are impaired by those pollutants to the extend that harbour porpoises are susceptible to infectious agents which may decrease the population size. [less ▲]

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See detailImpact of contaminated-sediment resuspension on phytoplankton in the Biguglia lagoon (Corsica, Mediterranean Sea)
Lafabrie, Céline; Garrido, Marie ULg; Leboulanger, Christophe et al

in Estuarine Coastal & Shelf Science (2013)

In shallow human-impacted systems, sediment resuspension events can result in pulsed exposures of pelagic organisms to multiple contaminants. Here, we examined the impact of the resuspension of ... [more ▼]

In shallow human-impacted systems, sediment resuspension events can result in pulsed exposures of pelagic organisms to multiple contaminants. Here, we examined the impact of the resuspension of contaminated sediment on phytoplankton in the Biguglia lagoon (Corsica, Mediterranean Sea), by conducting an in situ microcosm experiment over a 96-hour period. Natural phytoplankton was exposed to elutriates prepared from a contaminated sediment resuspension simulating process, and its functional and structural responses were compared with those of non-exposed phytoplankton. The elutriates displayed moderate multiple contamination by trace metals and PAHs. Our results show that elutriate exposure induced both functional and structural phytoplankton changes. Elutriates strongly stimulated phytoplankton growth after 24 h of exposure. They also enhanced phytoplankton photosynthetic performance during the first hours of exposure (up to 48 h), before reducing it towards the end of the experiment. Elutriates were also found to slightly stimulate Bacillariophyceae, and conversely to slightly inhibit Dinophyceae in the short term. Additionally, they stimulated phycocyanin-rich picocyanobacteria in the short term (8-48 h) before inhibiting it in the longer term (72-96 h), and to inhibit eukaryotic nanophytoplankton at short term (8-48 h) before stimulating it in the longer term (72-96 h). Sediment resuspension is thus likely to have a significant effect on the global dynamics of phytoplankton in contaminated coastal environments. [less ▲]

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