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  • lead
  • mercury
  • monitoring
  • 2020-2022  (73)
  • 1
    Publication Date: 2021-10-29
    Description: The monitoring of water quality, especially of karst springs, requires methods for rapidly estimating and quantifying parameters that indicate contamination. In the last few years, fluorescence-based measurements of tryptophan and humic acid have become a promising tool to assess water quality in near real-time. In this study, we conducted comparative tracer tests in a karst experimental site to investigate the transport properties and behavior of tryptophan and humic acid in a natural karst aquifer. These two tracers were compared with the conservative tracer uranine. Fluorescence measurements were conducted with an online field fluorometer and in the laboratory. The obtained breakthrough curves (BTCs) and the modeling results demonstrate that (1) the online field fluorometer is suitable for real-time fluorescence measurements of all three tracers; (2) the transport parameters obtained for uranine, tryptophan, and humic acid are comparable in the fast flow areas of the karst system; (3) the transport velocities of humic acid are slower and the resulting residence times are accordingly higher, compared to uranine and tryptophan, in the slower and longer flow paths; (4) the obtained BTCs reveal additional information about the investigated karst system. As a conclusion, the experiments show that the transport properties of tryptophan are similar to those of uranine while humic acid is partly transported slower and with retardation. These findings allow a better and quantitative interpretation of the results when these substances are used as natural fecal and contamination indicators.
    Keywords: 363.61 ; karst aquifer ; water quality ; monitoring ; tracer tests
    Language: English
    Type: map
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  • 2
    Publication Date: 2021-10-27
    Description: This study aimed to evaluate the effect of substrate contamination by mercury on the hepatopancreas of the Crustacean species; Armadillo officinalis Duméril, 1816. Uncontaminated specimens were collected from the banks of Ghar El Melh lagoon then exposed for three weeks to three concentrations of mercury salt solution. After the end of the exposure, the hepatopancreas of unexposed and exposed animals were compared to detect histological changes. Transmission Electron Microscopy observations showed that the hepatopancreas of Hg-exposed animals showed morphological and histological changes compared with control animals even at the lowest concentration. The degree of these alterations was found to be dose-dependent. The global predominant features were: microvillus border disruption, condensation of some cytoplasm areas and of chromatin, rough endoplasmic reticulum and mitochondrial alterations, lipid droplets modifications in addition to the increasing number of B-granules in the B and S cells.
    Description: Cette étude vise à évaluer l’effet de la contamination du substrat par le mercure sur l’hépatopancréas de l’espèce de Crustacés; Armadillo officinalis Duméril, 1816. Des échantillons non contaminés ont été recueillis sur les rives de la lagune de Ghar El Melh, puis exposés pendant trois semaines à trois concentrations de solution de sel de mercure. A la fin de l'exposition, l’hépatopancréas des animaux non exposés et exposés ont été comparés pour détecter les modifications histologiques. Les observations en microscopie électronique à transmission ont montré que l'hépatopancréas des animaux exposés au mercure présentait des changements morphologiques et histologiques par rapport aux animaux témoins, même à la concentration la plus faible. Le degré de ces altérations s'est avéré dépendant de la dose. Les principales caractéristiques globales étaient: la rupture de la frontière des microvillosités, la condensation de certaines zones du cytoplasme et de la chromatine, l’altération du réticulum endoplasmique rugueux et des mitochondries, la modification des gouttelettes lipidiques en plus du nombre croissant de granules B dans les cellules B et S.
    Description: Published
    Description: Refereed
    Keywords: Crustaceans ; mercury ; ultrastructure ; storage organ ; substrate contamination ; mercury ; Armadillo officinalis ; Crustacean ; hepatopancreas
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: 119-124
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  • 3
    Publication Date: 2021-10-01
    Description: Dislocated boulders are one sign of high-energy wave impacts on coasts. These high-energy impacts, caused by severe storms or tsunamis, can trigger initial cracking and transport of boulders. Monitoring of these boulders, as well as the associated coastal sites is important in distinguishing between gradual coastal processes and high-energy events. Western Greece is a seismically active area, where tsunamis and high-energetic storms might occur and such past events are documented by historic and geoscientific research, making it an ideal location for monitoring dislocated boulders. Since 2008, monitoring of eight different coastal sites in this region was conducted by terrestrial laser scanning and photogrammetric approaches, with low-cost unmanned aerial vehicles. The re-use of similar surveying points in following years, allowed highly accurate monitoring. Point clouds derived from these methods were evaluated for change detection by point cloud comparisons. The data were also used to establish accurate three-dimensional models of dislocated boulders (n = 70). The determined boulder volumes of these accurate three-dimensional models were incorporated in wave transport equations and wave decay curves, and compared with monitoring results. A comprehensive overview of dislocated boulders in western Greece is presented. Three-dimensional boulder reconstruction is compared to an approach which uses a tape-based measuring of boulder axes, with the tape-based measurement showing a mean overestimation of mass by 32%. Accurate monitoring over time by both methods, is achieved by using fixed networks of reference points. Changes for each site over time, detected by direct point cloud comparisons, are fit to the possible inundation calculated by wave decay curves based on computed minimum wave heights for boulder transport. Both storm and tsunami waves may have initiated movement from the cliff edge and further transport is also possible. However, boulders showed no further movement from their current position in the area for the time period of this study.
    Keywords: 551.36 ; Beaches ; boulders ; monitoring ; terrestrial laser scanning ; UAV
    Language: English
    Type: map
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  • 4
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    Florida Marine Research Institute | St. Petersburg, FL
    In:  http://aquaticcommons.org/id/eprint/26026 | 20978 | 2018-10-15 00:08:23 | 26026 | Florida Fish and Wildlife Conservation Commission
    Publication Date: 2021-07-24
    Description: Because mercury, a toxic metallic element, has been shown to bioaccumulate in fish tissue, humans consuming fish can potentially consume significant levels of mercury. Limited information is available on mercury levels in Florida’s marine and estuarine fish species. We examined the concentration of mercury in 2,832 fish representing 81 species from 32 families. Species represented all major trophic groups, from primary consumers to apex predators. Mercury concentrations in individual fish varied greatly within and among species. However, the majority of individuals we examined contained low concentrations. Species with very low mean or median mercury concentrations tended to be planktivores, detritivores, species that feed on invertebrates, or species that feed on benthic invertebrates and small fish. Apex predators typically had the highest mercury concentrations. In most species, mercury concentration increased as fish size increased. Sampling in Florida waters is continuing, and future research relating mercury levels to fish age, feeding ecology, and the trophic structure of Florida’s marine and estuarine ecosystems will help us to further identify important sources of variation.
    Keywords: Biology ; Fisheries ; Pollution ; mercury ; fishes ; Florida
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 35
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  • 5
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    Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute | St. Petersburg, FL
    In:  http://aquaticcommons.org/id/eprint/26948 | 9413 | 2019-12-28 20:24:05 | 26948 | Florida Fish and Wildlife Conservation Commission
    Publication Date: 2021-07-24
    Description: Mangrove swamps and salt marshes provide valuable ecological services to coastal ecosystems in Florida. Coastal wetlands are an important nursery for many ecologically and commercially important fish and invertebrates. The vegetation stabilizes shorelines, protecting the coast from wave energy, storm surge, and erosion. Coastal wetlands are also able to filter surface water runoff, removing excess nutrients and many pollutants. Peat deposits sequester large amounts of carbon, making coastal wetlands a key sink in global carbon cycles.Mangroves and salt marshes, however, are vulnerable to both direct and indirect threats from human development. Current threats include continued habitat loss, hydrologic alteration of surface and groundwater, sea-level rise, and invasive vegetation. ... Coastal wetland monitoring programs are often short-lived and vary widely in methodology. Monitoring most commonly occurs on protected public lands or at wetland mitigation or restoration sites. These monitoring projects are rarely long-term due to a lack of funding; restoration sites are generally monitored for only a few years. Although long-term funding is difficult to secure, monitoring over long time scales is increasingly important due to regional uncertainties as to how coastal wetland vegetation and substrate accretion will respond to sea-level rise, altered freshwater hydrology, and other disturbances. While periodic land cover mapping programs can capture large-scale changes in habitat extent, smaller-scale species shifts among mangrove and salt marsh vegetation are best captured by on-the-ground monitoring.The chapters in this report summarize recent mapping and monitoring programs in each region of Florida. Content of each chapter includes a general introduction to the region, location-specific threats to salt marshes and mangroves, a summary of selected mapping and monitoring programs, and recommendations for protection, management, and monitoring. Land cover maps in this report generally use data from the most recent water management district land use/land cover (LULC) maps.
    Description: Coastal Habitat Integrated Mapping and Monitoring Program (CHIMMP)
    Keywords: Conservation ; Environment ; Management ; Coastal Habitat Integrated Mapping and Monitoring Program ; CHIMMP ; Coastal Wetlands Group ; coastal wetlands ; salt marsh ; mangrove ; mapping ; monitoring ; management
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 160
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  • 6
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    In:  pjms_ku@yahoo.com | http://aquaticcommons.org/id/eprint/27014 | 25017 | 2020-05-07 03:30:42 | 27014 | University of Karachi. Marine Reference Collection and Resource Centre
    Publication Date: 2021-07-24
    Description: Cystoseira barbata (Stackhouse) C. Agardh, 1820 and Cystoseira crinita Duby, 1830 widely distributed and dominant in the Black Sea collected from Sinop coastal zone to monitor the current situation of regional metal pollution during the 2015-2016. Macro-algae, sediments and seawater samples were analyzed for metal contents (Al, As, Cd, Co, Cu, Fe, Hg, Mn, Ni, Pb and Zn) using inductively coupled plasma mass spectrometry (ICP-MS). The methodology was provided by using standard reference material BCR 279 – Ulva lactuca. The general metal uptake of Cystoseira spp. displayed a tendency in the order of Hg〈Cd〈Co〈Pb〈Ni〈Cu〈As〈Mn〈Zn〈Fe=Al. Accumulation of arsenic showed the highest levels in both seawater and sediments (BSAF〉2 and BCF〉5000) that was a good indicator for Cystoseira species. As a result of measured values, it is seen that Sinop region is below the pollution level. The observed results of the elemental accumulation noticed that Cystoseira spp. could be used regularly as a bio-monitor of coastal pollution in the study area.
    Description: Higher Education Commission of Pakistan
    Keywords: Biology ; Pollution ; metals ; macro-algae ; monitoring ; Cystoseira barbata ; Cystoseira crinita ; Black Sea
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 5-17
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  • 7
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    In:  http://aquaticcommons.org/id/eprint/27018 | 25017 | 2020-05-07 03:17:02 | 27018 | University of Karachi. Marine Reference Collection and Resource Centre
    Publication Date: 2021-07-24
    Description: In this study the amounts of mercury (Hg) were determined in tentacles and muscle tissues of O. ehrenbergii and S. buccalis from two coastal sites of Karachi; Buleji and Sunehri during Southwest monsoon (August and September) and Northeast monsoon (December and January) seasons of the year 2018. The mean amounts of Hg in edible tissues of sea cucumbers were as follows: O. ehrenbergii (0.0176 mg/kg dry wt.) and S. buccalis (0.0155 mg/kg dry wt.). Hg amounts in muscles of both species are much lower than the maximum permissible limits (0.5 mg/kg wet wt.). Estimated Daily Intakes for adults consuming O. ehrenbergii and S. buccalis are lower than published RfD values. Total Target Hazard Quotient (TTHQ) values (0.00787) are also lower than 1, it may be concluded that the consumption of these sea cucumbers from Karachi, do not pose any health hazards to human as Hg amounts were concerned.
    Description: Higher Education Commission of Pakistan
    Keywords: Biology ; Pollution ; Ohshimella ehrenbergii ; Stolus buccalis ; mercury ; Buleji ; Sunehri ; Karachi ; estimated daily intakes ; target ; hazard ; quotient
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 55-62
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  • 8
    Publication Date: 2021-07-14
    Description: The purpose of the project is to improve our understanding about best management practices that can be utilized on diked managed wetlands in Suisun Marsh for reducing the occurrence of low dissolved oxygen (DO) and high methylmercury (MeHg) events associated primarily with fall flood-up practices. Low DO events are of concern because they can lead to undue stress and even mortality of sensitive aquatic organisms. Elevated MeHg levels are of concern because MeHg is a neurotoxin that bio-magnifies up the food chain and can cause deleterious effects to higher trophic level consumers such as piscivorous fish, birds, and mammals (including humans). This study involved two years (2007-2008) of intensive field data collection at two managed wetland sites in northwest Suisun Marsh and their surrounding tidal sloughs, an area with prior documented low DO events. In addition, the study collected limited soils and water quality field data and mapped vegetation for three managed wetland sites in the central interior of Suisun Marsh, for the purpose of examining whether wetlands at other locations exhibit characteristics that could indicate potential for similar concerns. In Year 1 of the study, the objective was to identify the baseline conditions in the managed wetlands and determine which physical management conditions could be modified for Year 2 to reduce low DO and MeHg production issues most effectively. The objective of Year 2 was to evaluate the effectiveness of these modified management actions at reducing production of low DO and elevated MeHg conditions within the managed wetlands and to continue improving understanding of the underlying biogeochemical processes at play. This Final Evaluation Memorandum examined a total of 19 BMPs, 14 involving modified water management operations and the remaining five involving modified soil and vegetation management practices. Some of these BMPs were previously employed and others have not yet been tested. For each BMP this report assesses its efficacy in improving water quality conditions and potential conflicts with wetland management. It makes recommendations for further study (either feasibility assessments or field testing) and whether to consider for future use. Certain previously used BMPs were found to be important contributors to poor water quality conditions and their continued use is not recommended. Some BMPs that could improve water quality conditions appear difficult to implement in regards to compatibility with wetland management; these BMPs require further elaboration and feasibility assessment to determine whether they should be field tested. In practice for any given wetland, there is likely a combination of BMPs that would together have the greatest potential to address the low DO and high MeHg water quality concerns. Consequently, this report makes no sweeping recommendations applicable to large groups of wetlands but instead promotes a careful consideration of factors at each wetland or small groups of wetlands and from that assessment to apply the most effective suite of BMPs.This report also identifies a number of recommended future actions and studies. These recommendations are geared toward improving the process understanding of factors that promote low DO and high MeHg conditions, the extent of these problems in Suisun Marsh, the regulatory basis for the DO standards for a large estuarine marsh, the economics of BMPs, and alternative approaches to BMPs on diked managed wetlands that may address the water quality issues. The most important of these recommendations is that future BMP implementation should be carried out within the context of rigorous scientific evaluation so as to gain the maximum improvement in how to manage these water quality issues in the diked managed wetlands of Suisun Marsh.
    Description: State Water Resources Control Board
    Description: Project Number 06-283-552-0
    Keywords: Agriculture ; Chemistry ; Engineering ; Environment ; Fisheries ; Management ; Pollution ; BMPs ; dissolved oxygen ; mercury ; Suisun Marsh ; managed wetlands ; best management practices ; methyl mercury ; hydrology ; tidal water quality ; Wetlands and Water Resources ; Bachand and Associates ; Suisun Resource Conservation District ; California Department of Fish and Game ; California Department of Water Resources ; University of California Davis ; U.S. Geological Survey
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 353
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  • 9
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    In:  icsf@icsf.net | http://aquaticcommons.org/id/eprint/21195 | 25 | 2017-03-21 09:42:06 | 21195 | International Collective in Support of Fishworkers
    Publication Date: 2021-07-14
    Description: Big environmental NGOs are being ceded concessions for large protected areas of land and sea without proper monitoring, control and enforcement.
    Keywords: Fisheries ; Samudra Report ; ICSF ; environment ; protected areas ; monitoring
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 40-42
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  • 10
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    In:  sf@vti.bund.de | http://aquaticcommons.org/id/eprint/6548 | 1240 | 2012-11-14 18:31:37 | 6548 | Bundesforschungsanstalt für Fischerei
    Publication Date: 2021-07-14
    Description: Ergebnisse der 24. Forschungsfahrt des FFK "Solea"
    Description: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Keywords: Fisheries ; fishery situation ; North Sea ; stock development ; stock distribution ; cod ; Gadus morhua ; fishing areas ; monitoring
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 46-48
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