Search results for "BRACKISH"

showing 10 items of 55 documents

Changes in crustacean mesozooplankton and some environmental parameters in the Archipelago Sea (Northern Baltic) in 1976-1984

1990

Abstract The abundance of crustacean mesozooplankton was monitored by monthly sampling in the Archipelago Sea (Northern Baltic) during the years 1976-1984. Changes in the abundance of crustacean mesozooplankton species are compared with changes in water temperature, nutrient levels, chlorophyll-a, salinity and population densities of the Baltic herring (Clupea harengus membras L.). There was a rise of water temperature during the study period (about laC on average). The chlorophyll values were increasing, as were the nutrient levels in winter. Salinity was decreasing (on average 0.5‰ S). The biomass and abundance ofplanktivorous Baltic herring were increasing by about 30 and 50 per cent, re…

0106 biological sciencesbiologyBrackish waterEcology010604 marine biology & hydrobiologyfungiClupeaAquatic Sciencebiology.organism_classification010603 evolutionary biology01 natural sciencesZooplanktonSalinityOceanographyHerringAbundance (ecology)14. Life underwaterLimnetic zoneCopepodOphelia
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Acute and chronic response to a change in salinity of the euryhaline polychaete Pygospio elegans (Claparède)

2019

Abstract Estuaries are thought to be very harsh environments because their physico-chemical parameters, such as salinity, temperature and oxygen, can fluctuate substantially. The distribution of species living in an estuary is largely determined by how well they can cope with such fluctuations. The spionid polychaete Pygospio elegans is common in boreal estuarine habitats that show strong salinity fluctuations, living in habitats ranging from fully marine salinities to brackish environments with salinities as low as 5. In this study we investigated the abilities of P. elegans to cope with an acute as well as a long-term change in salinity. Specimens originating from a salinity of about 15 w…

0106 biological scienceseducation.field_of_studygeographyPolychaetegeography.geographical_feature_categoryBrackish waterRange (biology)010604 marine biology & hydrobiologyPopulationZoologyEstuaryEuryhalineAquatic ScienceBiologybiology.organism_classification010603 evolutionary biology01 natural sciencesSalinityOsmoregulationeducationEcology Evolution Behavior and SystematicsJournal of Experimental Marine Biology and Ecology
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Alleviation of Salt Stress by Plant Growth-Promoting Bacteria in Hydroponic Leaf Lettuce

2020

Mediterranean areas with intensive agriculture are characterized by high salinity of groundwater. The use of this water in hydroponic cultivations can lead to nutrient solutions with an electrical conductivity that overcomes the tolerance threshold of many vegetable species. Plant growth-promoting rhizobacteria (PGPR) were shown to minimize salt stress on several vegetable crops but the studies on the application of PGPR on leafy vegetables grown in hydroponics are rather limited and have not been used under salt stress conditions. This study aimed to evaluate the use of plant growth-promoting bacteria to increase the salt tolerance of leaf lettuce grown in autumn and spring in a floating s…

0106 biological sciencessaline waterBiomassSettore AGR/04 - Orticoltura E Floricolturanutrient solutionBiologyRhizobacteria01 natural scienceslcsh:Agriculturefloating systemNutrientbacterial biostimulantleafy vegetables<i>Lactuca sativa</i> L. var. <i>Crispa</i>Brackish waterfungilcsh:S<i>Bacillus</i>food and beverages04 agricultural and veterinary sciencesHydroponicsbiology.organism_classificationSaline waterSalinityHorticulturePGPRsaline water leafy vegetables Lactuca sativa L. var. Crispa floating system nutrient solution bacterial biostimulant PGPR Bacillus040103 agronomy & agriculture0401 agriculture forestry and fisheriesAgronomy and Crop ScienceBacteria010606 plant biology & botanyAgronomy
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Thermomineral waters of Greece: geochemical characterization

2020

75 °C). In terms of pH most results vary from 5.5 to 823 °C) ii) warm (23 40 °C) iii) thermal (40 75 °C) and iv) hyperthermal (&gtfew springs show either very low pH (&lt10) proposing serpentinization processes. Regarding TDS concentrations collected waters can be subdivided into low salinity (up to 1.5 g/L) brackish (up to 20 g/L) and saline (up to 43 g/L). The medium high salinities can be justified by mixing with sea water and/or strong waterrock interaction processes. Isotope composition of O and H ranges from 12.7 to +2.7 ‰ SMOW and from 91 to +12 ‰ SMOW respectively and is generally comprised between the Global Meteoric Water Line and the East Mediterranean Meteoric Water Line. Only few water samples show a positive shift for δ18O possibly related to high temperature waterrock interaction processes. Carbon dioxide (18 997000 μmol/mol) or N2 (1100 989000 μmol/mol) or CH4 (&ltMany geothermal areas of Greece are located in regions affected by Miocene or Quaternary volcanism and in continental basins characterised by elevated heat flow. Moreover the majority of them is found along the coast as well as in islands of the Aegean Sea and thus thermal water is often brackish to saline due to marine intrusion into costal aquifer. In the present study almost 300 thermal and cold mineral water samples were collected along the Hellenic territory with their physicochemical parameters (temperature pH electrical conductivity and Eh) and the amount of bicarbonates (titration with 0.1N HCl) being determined in situ. Additionally gases found either in free or dissolved phase were sampled. Both water and gas samples were analysed at the INGVPa laboratories for major ions (Ion Chromatography) silica (Inductively Coupled Plasma Optical Emission Spectrometry) chemical composition of free and dissolved gases (Gas Chromatography) water isotopes (O and H) and carbon and helium isotopes of free and dissolved gases (Mass Spectrometry). The temperature of the investigated waters ranges from 6.5 to 98°C pH from 1.96 to 11.98 whilst Total Dissolved Solids (TDS) from 0.06 to 43 g/L. Based on the temperature parameter waters can be divided into four groups: i) cold (&lt0.5 913000 μmol/mol) are the prevailing gas species found in the studied sites. The δ13CCO2 values ranged from 20.1 to +8.5 ‰ whilst the isotope ratio of He from 0.21 to 6.71 R/RA.4) suggesting interaction with H2Srich gases or very high pH values (&gtSettore GEO/08 - Geochimica E Vulcanologia
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Bioaccumulation of hepatotoxins : A considerable risk in the Latvian environment

2014

Abstract The Gulf of Riga, river Daugava and several interconnected lakes around the City of Riga, Latvia, form a dynamic brackish-freshwater system favouring occurrence of toxic cyanobacteria. We examined bioaccumulation of microcystins and nodularin-R in aquatic organisms in Latvian lakes, the Gulf of Riga and west coast of open Baltic Sea in 2002–2007. The freshwater unionids accumulated toxins efficiently, followed by snails. In contrast, Dreissena polymorpha and most lake fishes (except roach) accumulated much less hepatotoxins. Significant nodularin-R concentrations were detected also in marine clams and flounders. No transfer of nodularin-R and microcystins between lake and brackish …

Baltic StatesCyanobacteriatoksiinitHealth Toxicology and Mutagenesishealth risksFresh WaterFlounderToxicologyWater columnWater Pollutantsta116riskitkalatbiologyEcologyFishesHepatotoxinGeneral Medicineta3142selkärangattomatPollutionRiianlahtibioaccumulationBioaccumulationmaksamyrkytEnvironmental MonitoringmyrkytMicrocystinsOceans and SeasBacterial Toxinsta1172hepatotoxinsCyanobacteriaPeptides CyclicDreissenaAquatic organismsAnimalsInvertebratefishBrackish waterbiology.organism_classificationinvertebratessimpukatLatviaBivalviaFisheryLakesItämerikertyminenEnvironmental scienceterveysriskitEnvironmental Pollution
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Toxico-resistance of Baltic amphipod species to heavy metals

2013

Benthic organisms are important components of aquatic ecosystems and have been widely used to assess environmental pollution. Being very sensitive to a wide range of toxicants amphipods are often used as test objects in eco-toxicological studies. The aim of this study was to compare toxico-resistance of various Baltic amphipod species to exposure of heavy metals. The acute toxicity (48-h LC50 and 96-h LC50) of cadmium (CdCl2), copper (CuSO4) and zinc (ZnSO4 ⋅ 7H2O) was detected experimentally, using juveniles and adults of brackish water amphipods, Monoporeia affinis, Bathyporeia pilosa, Gammarus tigrinus, Pontogammarus robustoides and the freshwater amphipod Gammarus pulex as test objects.…

CadmiumbiologyBrackish waterEcologyAquatic ecosystemHyalella aztecachemistry.chemical_elementEnvironmental pollutionAquatic Sciencebiology.organism_classificationGammarus pulexPulexchemistryEnvironmental chemistryAnimal Science and ZoologyMonoporeiaCrustaceana
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Strontium/lithium ratio in aragonitic shells of Cerastoderma edule (Bivalvia) — A new potential temperature proxy for brackish environments

2015

Abstract Quantitative reconstruction of water temperature from shells of bivalve mollusks is still a very challenging task. For example, in highly variable environments such as intertidal zones, shell oxygen isotope values can only provide reliable temperature estimates if the δ18Owater signature during the time of growth is known. Furthermore, trace element-to-calcium ratios such as Sr/Ca or Mg/Ca often do not serve as reliable paleothermometers, because their incorporation into bivalve shells is known to be strongly biologically controlled. Here, we present a potential novel temperature proxy which is based on the Sr/Lishell ratio of the intertidal bivalve Cerastoderma edule. Up to 81% of…

Cerastoderma eduleStrontiumbiologyBrackish waterChemistrychemistry.chemical_elementMineralogyIntertidal zoneGeologybiology.organism_classificationBivalviaIsotopes of oxygenGeochemistry and PetrologyGrowth rateBivalve shellChemical Geology
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HCHs and DDTs in sediment-dwelling animals from the Yangtze Estuary, China

2005

HCHs and DDTs in sediment-dwelling animals including mollusks and crabs from the Yangtze Estuary were deter- mined by GC-ECD. Levels of t-HCH were in the range of 1.2-5.5 ng g � 1 and averaged 3.5 ng g � 1 in mollusks, while t-DDT concentrations ranged from 26.0 to 68.8 ng g � 1 , with a mean of 34.5 ng g � 1 . In crabs t-HCH concentrations var- ied from 2.0 to 25.7 ng g � 1 and averaged 13.8 ng g � 1 , whereas the concentrations of t-DDT were in the range of 1.5- 24.8 ng g � 1 with a mean value of 5.9 ng g � 1 . The HCHs and DDTs levels depend on geographical position and sources, showing the high levels at fresh water area in the estuary, such as XP, CM and LHK sites, and lower at brackis…

ChinaGeologic SedimentsEnvironmental EngineeringBrachyuraHealth Toxicology and MutagenesisDDTChineAnimalsEnvironmental ChemistryPersistent organic pollutantgeographygeography.geographical_feature_categorybiologyBrackish waterDecapodaEcologyPublic Health Environmental and Occupational HealthSedimentBiotaEstuaryGeneral MedicineGeneral Chemistrybiology.organism_classificationPollutionCrustaceanMolluscaEnvironmental chemistryHexachlorocyclohexaneWater Pollutants ChemicalEnvironmental MonitoringChemosphere
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Hydrogeochemical changes during managed aquifer recharge (MAR) in a salinised coastal aquifer

2021

15 p. - Supplementary data to this article can be found online at https://doi.org/10.1016/j.apgeochem.2020.104866. - The data used to support the findings of this study are available from http://repositori.uji.es/xmlui/handle/10803/620641.

Context (language use)AquiferSoil science010501 environmental sciences010502 geochemistry & geophysics01 natural scienceschemistry.chemical_compoundNitrateManaged aquifer rechargeGeochemistry and PetrologyEnvironmental ChemistrySulfate0105 earth and related environmental sciencesgeographygeography.geographical_feature_categoryBrackish waterGroundwater rechargeMixing ratiosPollutionSpanish mediterranean aquiferchemistryHydrogeochemical processesEnvironmental scienceCarbonateGroundwater
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The Desalination Process Driven by Wave Energy: A Challenge for the Future

2016

The correlation between water and energy is currently the focus of several investigations. In particular, desalination is a technological process characterized by high energy consumption; nevertheless, desalination represents the only practicable solution in several areas, where the availability of fresh water is limited but brackish water or seawater are present. These natural resources (energy and water) are essential for each other; energy system conversion needs water, and electrical energy is necessary for water treatment or transport. Several interesting aspects include the study of saline desalination as an answer to freshwater needs and the application of renewable energy (RE) devic…

EngineeringControl and Optimization020209 energywaterEnergy Engineering and Power Technology02 engineering and technologyGeothermal desalinationwaveDesalinationlcsh:Technologydesalination0202 electrical engineering electronic engineering information engineeringdesalination; water; renewable energy; waveElectrical and Electronic EngineeringEngineering (miscellaneous)Settore ING-IND/11 - Fisica Tecnica AmbientaleBrackish waterRenewable Energy Sustainability and the Environmentbusiness.industrylcsh:TElectric potential energyEnvironmental engineering021001 nanoscience & nanotechnologyNatural resourcerenewable energyRenewable energyWater treatment0210 nano-technologyEnergy sourcebusinessEnergy (miscellaneous)Energies
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