13 research outputs found
Near-IR and optical radial velocities of the active M-dwarf star Gl 388 (AD Leo) with SPIRou at CFHT and SOPHIE at OHP
Context: The search for extrasolar planets around the nearest M-dwarfs is a
crucial step towards identifying the nearest Earth-like planets. One of the
main challenges in this search is that M-dwarfs can be magnetically active and
stellar activity can produce radial velocity (RV) signals that could mimic
those of a planet.
Aims: We aim to investigate whether the 2.2 day period observed in optical
RVs of the nearby active M-dwarf star Gl 388 (AD Leo) is due to stellar
activity or to a planet which co-rotates with the star as suggested in the
past.
Methods: We obtained quasi-simultaneous optical RVs of Gl 388 from 2019 to
2021 with SOPHIE (R75k) at the OHP in France, and near-IR RV and Stokes V
measurements with SPIRou at the CFHT (R70k).
Results: The SOPHIE RV time-series displays a periodic signal with
2.230.01 days period and 23.60.5 m/s amplitude, which is consistent
with previous HARPS observations obtained in 2005-2006. The SPIRou RV
time-series is flat at 5 m/s rms and displays no periodic signals. RV signals
of amplitude higher than 5.3 m/s at a period of 2.23 days can be excluded with
a confidence level higher than 99%. Using the modulation of the longitudinal
magnetic field (Bl) measured with SPIRou, we derive a stellar rotation period
of 2.23050.0016 days.
Conclusions: SPIRou RV measurements provide solid evidence that the periodic
variability of the optical RVs of Gl 388 is due to stellar activity rather than
to a co-rotating planet. The magnetic activity nature of the optical RV signal
is further confirmed by the modulation of Bl with the same period. The SPIRou
campaign on Gl 388 demonstrates the power of near-IR RV to confirm or infirm
planet candidates discovered in the optical around active stars. SPIRou
observations reiterate how effective spectropolarimetry is at determining the
stellar rotation period.Comment: 25 pages, 23 figures, Accepted by Astronomy and Astrophysic
Optical and near-infrared stellar activity characterization of the early M dwarf Gl~205 with SOPHIE and SPIRou
The stellar activity of M dwarfs is the main limitation for discovering and
characterizing exoplanets orbiting them since it induces quasi-periodic RV
variations. We aim to characterize the magnetic field and stellar activity of
the early, moderately active, M dwarf Gl205 in the optical and nIR domains. We
obtained high-precision quasi-simultaneous spectra in the optical and nIR with
the SOPHIE spectrograph and SPIRou spectropolarimeter between 2019 and 2022. We
computed the RVs from both instruments and the SPIRou Stokes V profiles. We
used ZDI to map the large-scale magnetic field over the time span of the
observations. We studied the temporal behavior of optical and nIR RVs and
activity indicators with the Lomb-Scargle periodogram and a quasi-periodic GP
regression. In the nIR, we studied the equivalent width of Al I, Ti I, K I, Fe
I, and He I. We modeled the activity-induced RV jitter using a
multi-dimensional GP regression with activity indicators as ancillary time
series. The optical and nIR RVs have similar scatter but nIR shows a more
complex temporal evolution. We observe an evolution of the magnetic field
topology from a poloidal dipolar field in 2019 to a dominantly toroidal field
in 2022. We measured a stellar rotation period of Prot=34.40.5 d in the
longitudinal magnetic field. Using ZDI we measure the amount of latitudinal
differential rotation (DR) shearing the stellar surface yielding rotation
periods of Peq=32.01.8 d at the stellar equator and Ppol=45.50.3 d at
the poles. We observed inconsistencies in the activity indicators'
periodicities that could be explained by these DR values. The multi-dimensional
GP modeling yields an RMS of the RV residuals down to the noise level of 3 m/s
for both instruments, using as ancillary time series H and the BIS in
the optical, and the FWHM in the nIR.Comment: 41 pages, 24 figures. Accepted for publication in A&A. Improved
quality of figures and reduced size of Appendi
The EBLM Project XI. Mass, radius and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS
Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This ``radius inflation'' problem could have an impact on both stellar and exoplanetary science. We present the final results of our observation programme with the CHEOPS satellite to obtain high-precision light curves of eclipsing binaries with low mass stellar companions (EBLMs). Combined with the spectroscopic orbits of the solar-type companion, we can derive the masses, radii and effective temperatures of 23 M-dwarf stars. We use the PYCHEOPS data analysis software to analyse their primary and secondary occultations. For all but one target, we also perform analyses with TESS light curves for comparison. We have assessed the impact of starspot-induced variation on our derived parameters and account for this in our radius and effective temperature uncertainties using simulated light curves. We observe trends for inflation with both metallicity and orbital separation. We also observe a strong trend in the difference between theoretical and observational effective temperatures with metallicity. There is no such trend with orbital separation. These results are not consistent with the idea that observed inflation in stellar radius combines with lower effective temperature to preserve the luminosity predicted by low-mass stellar models. Our EBLM systems are high-quality and homogeneous measurements that can be used in further studies into radius inflation
A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)
Meeting abstrac
Allometric models for estimating aboveground biomass in tree sprouts of three dendroenergetic crops
Recurrent problems have been observed for biomass measurement in tree sprouts, mainly due
to differences in patterns of biomass distribution and the bias generated by using models for mature trees.
The objective of this research was to evaluate models to estimate aboveground biomass in sprouts from
two-year-old stumps of Short Rotation Woody Crops (SRWC) used for energetic purposes.
The study was conducted in Central Chile (BĂo-BĂo region) under a complete block design and four replications. Three plant species were included: Eucalyptus globulus, E. denticulata, and Acacia dealbata, established in
three population densities (5,000, 10,000 and 15,000 trees per ha). Two groups of nonlinear models were
used on three independent variables: root collar diameter (squared mean of two dominant stems), height
(mean of two dominant stems) and number of epicormic stems.
In the allometric model, the total aboveground biomass and the aboveground biomass by component were
explained as the product of the mean square of the root collar diameter, mean height of the two dominant
new sprouts and total number of epicormic sprouts as the predictive variable. Values of coefficient of determination (R2
) ranged from 0.78 to 0.95 and RMSE ranged from 168 to 913 g. The species of E. globulus
showed higher RMSE for biomass estimation in the all components except the branch component. The
inclusion of dummy variables to identify the differences in each parameter of the models explained the seasonality of the biomass accumulation in tree sprouts at 10, 21, and 31 months of age, improving the model
goodness of fit RMSE by 27%.
Accurate prediction of sprouts aboveground biomass was obtained by the models only evaluating the two
dominant epicormic sprouts in the stump, avoiding the need of individual sprouts evaluation or using destructive methods for biomass measurement
Photodissociation Mechanisms of Major Mercury(II) Species in the Atmospheric Chemical Cycle of Mercury
7 pags., 4 figs.Mercury is a contaminant of global concern that is transported throughout the atmosphere as elemental mercury Hg and its oxidized forms Hg and Hg. The efficient gas-phase photolysis of Hg and Hg has recently been reported. However, whether the photolysis of Hg leads to other stable Hg species, to Hg, or to Hg and its competition with thermal reactivity remain unknown. Herein, we show that all oxidized forms of mercury rapidly revert directly and indirectly to Hg by photolysis. Results are based on non-adiabatic dynamics simulations, in which the photoproduct ratios were determined with maximum errors of 3%. We construct for the first time a complete quantitative mechanism of the photochemical and thermal conversion between atmospheric Hg, Hg, and Hg compounds. These results reveal new fundamental chemistry that has broad implications for the global atmospheric Hg cycle. Thus, photoreduction clearly competes with thermal oxidation, with Hg being the main photoproduct of Hg photolysis in the atmosphere, which significantly increases the lifetime of this metal in the environment.Ministerio de EconomĂa y Competitividad. Grant Numbers: CTQ2017-87054-C2-2-P, RYC- 2015-19234, MDM-2015-0538
Generalitat Valenciana. Grant Number: APOSTD/2019/149
European Research Council. Grant Number: ERC-2016-COG 726349 CLIMAHA
Analysis of ibuprofen and its main metabolites in roots, shoots, and seeds of cowpea (Vigna unguiculata L. Walp) using liquid chromatography-quadrupole time-of-flight mass spectrometry: uptake, metabolism, and translocation
EpIG-DB:A database of vascular epiphyte assemblages in the Neotropics
Vascular epiphytes are a diverse and conspicuous component of biodiversity in tropical and subtropical forests. Yet, the patterns and drivers of epiphyte assemblages are poorly studied in comparison with soil-rooted plants. Current knowledge about diversity patterns of epiphytes mainly stems from local studies or floristic inventories, but this information has not yet been integrated to allow a better understanding of large-scale distribution patterns. EpIG-DB, the first database on epiphyte assemblages at the continental scale, resulted from an exhaustive compilation of published and unpublished inventory data from the Neotropics. The current version of EpIG-DB consists of 463,196 individual epiphytes from 3,005 species, which were collected from a total of 18,148 relevĂ©s (host trees and âunderstoryâ plots). EpIG-DB reports the occurrence of âtrueâ epiphytes, hemiepiphytes and nomadic vines, including information on their cover, abundance, frequency and biomass. Most records (97%) correspond to sampled host trees, 76% of them aggregated in forest plots. The data is stored in a TURBOVEG database using the most up-to-date checklist of vascular epiphytes. A total of 18 additional fields were created for the standardization of associated data commonly used in epiphyte ecology (e.g. by considering different sampling methods). EpIG-DB currently covers six major biomes across the whole latitudinal range of epiphytes in the Neotropics but welcomes data globally. This novel database provides, for the first time, unique biodiversity data on epiphytes for the Neotropics and unified guidelines for future collection of epiphyte data. EpIG-DB will allow exploration of new ways to study the community ecology and biogeography of vascular epiphytes.</p
Assessing and forecasting the impacts of global change on Mediterranean rivers. The SCARCE Consolider project on Iberian basins
The Consolider-Ingenio 2010 project SCARCE, with the full title "Assessing and predicting effects on water quantity and quality in Iberian Rivers caused by global change" aims to examine and predict the relevance of global change on water availability, water quality, and ecosystem services in Mediterranean river basins of the Iberian Peninsula, as well as their socio-economic impacts. Starting in December 2009, it brought together a multidisciplinary team of 11 partner Spanish institutions, as well as the active involvement of water authorities, river basin managers, and other relevant agents as stakeholders.
The study areas are the Llobregat, Ebro, Jucar, and Guadalquivir river basins. These basins have been included in previous studies and projects, the majority of whom considered some of the aspects included in SCARCE but individually. Historical data will be used as a starting point of the project but also to obtain longer time series. The main added value of SCARCE project is the inclusion of scientific disciplines ranging from hydrology, geomorphology, ecology, chemistry, and ecotoxicology, to engineering, modeling, and economy, in an unprecedented effort in the Mediterranean area. The project performs data mining, field, and lab research as well as modeling and upscaling of the findings to apply them to the entire river basin.
Scales ranging from the laboratory to river basins are addressed with the potential to help improve river basin management. The project emphasizes, thus, linking basic research and management practices in a single framework. In fact, one of the main objectives of SCARCE is to act as a bridge between the scientific and the management and to transform research results on management keys and tools for improving the River Basin Management Plans. Here, we outline the general structure of the project and the activities conducted within the ten Work Packages of SCARCE.This work has been supported by the Spanish Ministry of Science and Innovation through the project Consolider-Ingenio 2010 CSD2009-00065. Special thanks are due to all partners of the SCARCE consortium and the peer review panel for ensuring quality results and fruitful collaboration within the project.FrancĂ©s, F. (2012). Assessing and forecasting the impacts of global change on Mediterranean rivers. The SCARCE Consolider project on Iberian basins. Environmental Science and Pollution Research. 19:918-933. https://doi.org/10.1007/s11356-011-0566-5S91893319Andreu J, Capilla J, SanchĂs E (1996) AQUATOOL, a generalized decision-support system for water-resources planning and operational management. J Hydrol 177:269â291Barahona-Palomo M, Riva M, SĂĄnchez-Vila X, VĂĄzquez-Sune E, Guadagnini A (2011) Quantitative comparison of impeller-flowmeter and particle-size-distribution techniques for the characterization of hydraulic conductivity variability. Hydrogeology Journal 19:603â612BarcelĂł D, Petrovic M (eds) (2011) The Ebro River basin. the handbook of environmental chemistry. Springer, BerlinBarcelĂł D, Sabater S (2010) Water quality and assessment under scarcity: prospects and challenges in Mediterranean watersheds. J Hydrol 383:1â4Barrios M, Orozco J, LĂłpez F, FrancĂ©s F (2010). Influencia de momentos de segundo orden en el escalamiento espacial de parĂĄmetros hidrolĂłgicos. In: XXIV Congreso Latinoamericano de HidrĂĄulica, Punta del Este, UruguayBoix D, GarcĂa-Berthou E, GascĂłn S, Benejam L, TornĂ©s E, Sala J, Benito J, MunnĂ© A, SolĂ C, Sabater S (2010) Response of community structure to sustained drought in Mediterranean rivers. J Hydrol 383:135â146Bolster D, Barahona M, Dentz M, FernĂ ndez-Garcia D, SĂĄnchez-Vila X, Trinchero P, Valhondo C, Tartakovsky DM (2009) Probabilistic risk analysis of groundwater remediation strategies. Water Resour Res 45: W06413Brack W, Bakker J, de Deckere E, Deerenberg C, van Gils J, Hein M, Jurajda P, Kooijman B, Lamoree M, Lek S, LĂłpez de Alda MJ, Marcomini A, Muñoz I, Rattei S, Segner H, Thomas K, von der Ohe PC, Westrich B, de Zwart D, Schmitt-Jansen M (2005) MODELKEY - Models for assessing and forecasting the impact of environmental key pollutants on freshwater and marine ecosystems and biodiversity. Environ Sci Pollut Res 12:252â256CalbĂł J (2010) Water scarcity in the Mediterranean. In: Sabater S, BarcelĂł D (eds) The handbook of environmental chemistry. Springer, BerlinCarmona-Catot G, Benito J, GarcĂa-Berthou E (2011) Comparing latitudinal and upstreamâdownstream gradients: life history traits of invasive mosquitofish. Divers Distrib 17:214â224CHE (2008) ConfederaciĂłn HidrogrĂĄfica del Ebro. Available from: http://www.chebro.es . Accessed January 2009de Barros FPJ, Bolster D, Sanchez-Vila X, Nowak W (2011) A divide and conquer approach to cope with uncertainty, human health risk and decision making in contaminant hydrology. Water Resour Res (in press)Dodds WK, Bouska WW, Eitzmann JL, Pilger TJ, Pitts KL, Riley AJ, Schloesser JT, Thornbrugh DJ (2009) Eutrophication of US freshwaters: analysis of potential economic damages. Environ Sci Technol 43:12â19Elosegi A, DĂez J, Mutz M (2010) Effects of hydromorphological integrity on biodiversity and functioning of river ecosystems. Hydrobiologia 657:199â215Estrela T, Fidalgo A, Fullana J, Maestu J, PĂ©rez MA, Pujante AM (2004) JĂșcar Pilot River Basin. Provisional article 5. Report pursuant to the Water Framework Directive. ConfederaciĂłn HidrogrĂĄfica del JĂșcar, Valencia (Spain). p 208FernĂ ndez-Garcia D, SĂĄnchez-Vila X (2011) Optimal reconstruction of concentrations, gradients and reaction rates from particle distributions. J Contam Hydrol 120â121:99â114FernĂ ndez-Garcia D, SĂĄnchez-Vila X, Illangasekare TH (2002) Convergent-flow tracer tests in heterogeneous media: combined experimental-numerical analysis for determination of equivalent transport parameters. J Contam Hydrol 57:129â145FrancĂ©s F, VĂ©lez JI, VĂ©lez JJ (2007) Split-parameter structure for the automatic calibration of distributed hydrological models. J Hydrol 332:226â240Funtowicz S, Ravetz J (1994) The worth of a songbird: ecological economics as a post-normal science. Ecol Econ 10:197â207GarcĂa-GalĂĄn M, Garrido T, Fraile J, Ginebreda A, DĂaz-Cruz M, BarcelĂł D (2010a) Application of fully automated online solid phase extraction-liquid chromatography-electrospray-tandem mass spectrometry for the determination of sulfonamides and their acetylated metabolites in groundwater. Anal Bioanal Chem 399:795â806GarcĂa-GalĂĄn MJ, DĂaz-Cruz MS, BarcelĂł D (2010b) Occurrence of sulfonamide residues along the Ebro river basin: removal in wastewater treatment plants and environmental impact assessment. Environ Int 37:462â473Gasith A, Resh VH (1999) Streams in Mediterranean climate regions: abiotic influences and biotic responses to predictable seasonal events. Annu Rev Ecol Syst 30:51â81Gaudes A, Artigas J, Muñoz I (2010) Species traits and resilience of meiofauna to floods and drought in a Mediterranean stream. Mar Freshw Res 61:1336â1347Ginebreda A, Muñoz I, LĂłpez de Alda MJ, Brix R, LĂłpez-Doval J, BarcelĂł D (2010) Environmental risk assessment of pharmaceuticals in rivers: relationships between hazard indexes and aquatic macroinvertebrate diversity indexes in the Llobregat River (NE Spain). Environ Int 36:153â162Giorgi F, Lionello P (2008) Climate change projections for the Mediterranean region. Glob Planet Chang 63:90â104Greskowiak J, Prommer H, Massmann G, Johnston CD, Nutzmann G, Pekdeger A (2005) The impact of variably saturated conditions on hydrogeochemical changes during artificial recharge of groundwater. Appl Geochem 20:1409â1426Guasch H, Leira M, Montuelle B, Geiszinger A, Roulier JL, TornĂ©s E, Serra A (2009) Use of multivariate analyses to investigate the contribution of metal pollution to diatom species composition: search for the most appropriate cases and explanatory variables. Hydrobiologia 627:143â158Guerra P, Eljarrat E, BarcelĂł D (2010) Simultaneous determination of hexabromocyclododecane, tetrabromobisphenol A, and related compounds in sewage sludge and sediment samples from Ebro River basin (Spain). Anal Bioanal Chem 397:2817â2824IPCC (2007) Fourth assessment report: climate change 2007. Cambridge University Press, CambridgeIzagirre O, Agirre U, Bermejo M, Pozo J, Elosegi A (2008) Environmental controls of whole-stream metabolism identified from continuous monitoring of Basque streams. J N Am Benthol Soc 27:252â268Jelic A, Gros M, Ginebreda A, CĂ©spedes-SĂĄnchez R, Ventura F, Petrovic M, BarcelĂł D (2011) Occurrence, partition and removal of pharmaceuticals in sewage water and sludge during wastewater treatment. Water Res 45:1165â1176Kay JJ, Regier HA, Boyle M, Francis G (1999) An ecosystem approach for sustainability: addressing the chanllenge of complexity. Futures 31:721â742Köck-Schulmeyer M, Ginebreda A, Postigo C, LĂłpez-Serna R, PĂ©rez S, Brix R, Llorca M, LĂłpez de Alda MJ, Petrovic M, MunnĂ© A, Tirapu L, BarcelĂł D (2011) Wastewater reuse in Mediterranean semi-arid areas: the impact of discharges of tertiary treated sewage on the load of polar micro pollutants in the Llobregat river (NE Spain). Chemosphere 82:670â678Kuster M, De la Cal A, Eljarrat E, LĂłpez de Alda MJ, BarcelĂł D (2010a) Evaluation of two aquatic passive sampling configurations for their suitability in the analysis of estrogens in water. Talanta 83:493â499Kuster M, DĂaz-Cruz S, Rosell M, LĂłpez de Alda MJ, BarcelĂł D (2010b) Fate of selected pesticides, estrogens, progestogens and volatile organic compounds during artificial aquifer recharge using surface waters. Chemosphere 79:880â886Lacorte S, RaldĂșa D, MartĂnez E, Navarro A, DĂez S, Bayona JM, BarcelĂł D (2006) Pilot survey of a broad range of priority pollutants in sediment and fish from the Ebro river basin (NE Spain). Environ Pollut 140:471â482Lindenmayer DB, Likens GE (2009) Adaptive monitoring: a new paradigm for long-term research and monitoring. Trends Ecol Evol 24:482â486LĂłpez-Serna R, PĂ©rez S, Ginebreda A, Petrovic M, BarcelĂł D (2010) Fully automated determination of 74 pharmaceuticals in environmental and waste waters by online solid phase extraction-liquid chromatography-electrospray-tandem mass spectrometry. Talanta 83:410â424Llorca M, FarrĂ© M, PicĂł Y, BarcelĂł D (2010) Study of the performance of three LC-MS/MS platforms for analysis of perfluorinated compounds. Anal Bioanal Chem 398:1145â1159MarcĂ© R, RodrĂguez MA, GarcĂa JC, Armengol J (2010) El Nino Southern oscillation and climate trends impact reservoir water quality. Glob Chang Biol 16:2857â2865MartĂn G, Toja J, Sala SE, FernĂĄndez MD, Reyes I, Casco MA (2010) Application of diatom biotic indices in the Guadalquivir River Basin, a Mediterranean basin. Which one is the most appropriated? Environ Monit Assess 170:519â534Mas-MartĂ E, GarcĂa-Berthou E, Sabater S, Tomanova S, Muñoz I (2010) Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream. Hydrobiologia 657:167â180Medici C, Bernal S, Butturini A, Sabater F, MartĂn M, Wade AJ, FrancĂ©s F (2010) Modelling the inorganic nitrogen behaviour in a small Mediterranean forested catchment, Fuirosos (Catalonia). Hydrol Earth Syst Sci 14:223â237Millenium Ecosystem Assessment (2005) Ecosystems and human well-being: synthesis. Island Press, Washington (US), p 137Muñoz I, LĂłpez-Doval JC, Ricart M, Villagrasa M, Brix R, Geiszinger A, Ginebreda A, Guasch H, LĂłpez de Alda MJ, RomanĂ AM, Sabater S, BarcelĂł D (2009) Bridging levels of pharmaceuticals in river water with biological community structure in the Llobregat River Basin (Northeast Spain). Environ Toxicol Chem 28:2706â2714Nadal M, Kumar V, Schuhmacher M, Domingo JL (2008) Applicability of a neuroprobabilistic integral risk index for the environmental management of polluted areas: a case study. Risk Anal 28:271â286Navarro-Ortega A, Tauler R, Lacorte S, BarcelĂł D (2010) Occurrence and transport of PAHs, pesticides and alkylphenols in sediment samples along the Ebro River Basin. J Hydrol 383:5â17Navarro A, Lacorte S, BarcelĂł D (2010) Occurrence and transport of pesticides and alkylphenols in water samples along the Ebro River Basin. J Hydrol 383:18â29Navarro A, Tauler R, Lacorte S, BarcelĂł D (2006) Chemometrical investigation of the presence and distribution of organochlorine and polyaromatic compounds in sediments of the Ebro River Basin. Anal Bioanal Chem 385:1020â1030Nelson E, Mendoza G, Regetz J, Polasky S, Tallis H, Cameron DR, Chan KMA, Daily GC, Goldstein J, Kareiva PM, Lonsdorf E, Naidoo R, Ricketts TH, Shaw MR (2009) Modeling multiple ecosystem services, biodiversity conservation, commodity production, and tradeoffs at landscape scales. Front Ecol Environ 7:4â11Nilsson C, Reidy CA, Dynesius M, Revenga C (2005) Fragmentation and flow regulation of the world's large river systems. Science 308:405â408Odum HT (1956) Primary production in flowing waters. Limnol Oceanogr 1:102â117Paredes-Arquiola J, Andreu-Ălvarez J, MartĂn-Monerris M, Solera A (2010) Water quantity and quality models applied to the Jucar River Basin, Spain. Water Res Manag 24:2759â2779Paredes J, Andreu J, Solera A (2010) A decision support system for water quality issues in the Manzanares River (Madrid, Spain). Sci Total Environ 408:2576â2589Petrovic M, FarrĂ© M, LĂłpez de Alda MJ, Perez S, Postigo C, Kock M, Radjenovic J, Gros M, BarcelĂł D (2010) Recent trends in the liquid chromatography-mass spectrometry analysis of organic contaminants in environmental samples. J Chromatogr A 1217:4004â4017Puy-Azurmendi E, Navarro A, Olivares A, Fernandes D, MartĂnez E, LĂłpez de Alda MJ, Porte C, Cajaraville MP, BarcelĂł D, Piña B (2010) Origin and distribution of polycyclic aromatic hydrocarbon pollution in sediment and fish from the biosphere reserve of Urdaibai (Bay of Biscay, Basque country, Spain). Mar Environ Res 70:142â149Quevedo DI, FrancĂ©s F (2008) A conceptual dynamic vegetation-soil model for arid and semiarid zones. Hydrol Earth Syst Sci 12:1175â1187Ramos-FernĂĄndez L, FrancĂ©s F (2010). Utilidad de la precipitaciĂłn obtenida por satĂ©lite en la modelaciĂłn hidrolĂłgica aplicada a la cuenca del rĂo. In: XXIV Congreso Latinoamericano de HidrĂĄulica, Punta del Este, UruguayRamos-Jiliberto R, Valdovinos FS, Arias J, Alcaraz C, GarcĂa-Berthou E (2011) A network-based approach to the analysis of ontogenetic diet shifts: an example with an endangered, small-sized fish. Ecol Complex 8:123â129Ricart M, Guasch H, Alberch M, BarcelĂł D, Bonnineau C, Geiszinger A, FarrĂ© M, Ferrer J, Ricciardi F, RomanĂ AM, Morin S, Proia L, Sala L, Sureda D, Sabater S (2010a) Triclosan persistence through wastewater treatment plants and its potential toxic effects on river biofilms. Aquat Toxicol 100:346â353Ricart M, Guasch H, BarcelĂł D, Brix R, Conceicao MH, Geiszinger A, LĂłpez de Alda MJ, Lopez-Doval JC, Munoz I, Postigo C, Romani AM, Villagrasa M, Sabater S (2010b) Primary and complex stressors in polluted mediterranean rivers: pesticide effects on biological communities. J Hydrol 383:52â61Sabater S, Tockner K (2010) Effects of hydrologic alterations on the ecological quality of river ecosystems. In: Sabater S, BarcelĂł D (eds) Water scarcity in the Mediterranean. Springer, BerlinSĂĄnchez-Vila X, Carrera J (1997) Directional effects on convergent flow tracer tests. Math Geol 29:551â569SĂĄnchez-Vila X, FernĂ ndez-Garcia D, Guadagnini A (2010) Interpretation of column experiments of transport of solutes undergoing an irreversible bimolecular reaction using a continuum approximation. Water Resour Res 46:W12510Sand-Jensen K, Pedersen NL (2005) Differences in temperature, organic carbon and oxygen consumption among lowland streams. Freshw Biol 50:1927â1937Schroter D, Cramer W, Leemans R, Prentice IC, Araujo MB, Arnell NW, Bondeau A, Bugmann H, Carter TR, Gracia CA, de la Vega-Leinert AC, Erhard M, Ewert F, Glendining M, House JI, Kankaanpaa S, Klein RJT, Lavorel S, Lindner M, Metzger MJ, Meyer J, Mitchell TD, Reginster I, Rounsevell M, Sabate S, Sitch S, Smith B, Smith J, Smith P, Sykes MT, Thonicke K, Thuiller W, Tuck G, Zaehle S, Zierl B (2005) Ecosystem service supply and vulnerability to global change in Europe. Science 310:1333â1337Singer MB, Dunne T (2001) Identifying eroding and depositional reaches of valley by analysis of suspended sediment transport in the Sacramento River, California. Water Resour Res 37:3371â3381Stevenson RJ, Sabater S (2010) Understanding effects of global change on river ecosystems: science to support policy in a changing world. Hydrobiologia 657:3â18Tharme RE (2003) A global perspective on environmental flow assessment: emerging trends in the development and application of environmental flow methodologies for rivers. River Res Appl 19:397â441TornĂ©s E, Sabater S (2010) Variable discharge alters habitat suitability for benthic algae and cyanobacteria in a forested Mediterranean stream. Mar Freshw Res 61:441â450Trinchero P, SĂĄnchez-Vila X, FernĂ ndez-Garcia D (2008) Point-to-point connectivity, an abstract concept or a key issue for risk assessment studies? Adv Water Res 31:1742â1753VĂĄzquez-Roig P, Andreu V, Blasco C, PicĂł Y, Andreu V (2010) SPE and LC-MS/MS determination of 14 illicit drugs in surface waters from the Natural Park of L'Albufera (ValSncia, Spain). Anal Bioanal Chem 397:2851â2864Vericat D, Batalla RJ (2006) Sediment transport in a large impounded river: the lower Ebro, NE Iberian Peninsula. Geomorphology 79:72â92Walker B, Carpenter S, Anderies J, Abel N, Cumming G, Janssen M, Lebel L, Norberg J, Peterson GD, Pritchard R (2002) Resilience management in social-ecological systems: a working hypothesis for a participatory approach. Conserv Ecol 6:14Weyhenmeyer GA (2004) Synchrony in relationships between the North Atlantic Oscillation and water chemistry among Swedenâs largest lakes. Limnol Oceanogr 49:1191â1201Ylla I, Sanpera-Calbet I, VĂĄzquez E, RomanĂ AM, Muñoz I, Butturini A, Sabater S (2010) Organic matter availability during pre- and post-drought periods in a Mediterranean stream. Hydrobiologia 657:217â23