The Experts below are selected from a list of 28527 Experts worldwide ranked by ideXlab platform
N. S. Magesh - One of the best experts on this subject based on the ideXlab platform.
-
A baseline study on trace element based Sediment Pollution and potential ecological risk of reef Sediments of Musal, Manoli and Manoli putti Islands, Gulf of Mannar, India
Marine pollution bulletin, 2018Co-Authors: P. Saravanan, D. Pradhap, S. Krishnakumar, Judith D. Silva, A. Vidyasakar, Merin Sackaria, S. Godson, K. Arumugam, N. S. MageshAbstract:The aim of the present study is to assess the baseline level of the trace element, Sediment Pollution and potential ecological risk of reef associated Sediments of Musal, Manoli and Manoli putti Islands, Gulf of Mannar, India. The grain size distribution of the Sediments is chiefly controlled by corals and broken shell debris. The distribution of lithoclastic fractions and element concentration are most probably derived from longshore Sediment transport and fluvial process from nearby mainland. The enrichment of organic matter is chiefly controlled by mangrove litters and sea grasses. The concentration of lead in the marine Sediments is subjected to Sediment matrix, vicinity of the local pollutant sources and distance from the mainland coast. The ecological risk assessment clearly reveals that the Sediments belong to the low risk category.
-
Elemental concentration based potential ecological risk (PER) status of the surface Sediments, Pulicat lagoon, Southeast coast of India.
Marine pollution bulletin, 2018Co-Authors: P. Saravanan, D. Pradhap, S. Krishnakumar, Judith D. Silva, K. Arumugam, N. S. Magesh, S. SrinivasaluAbstract:Abstract Eighty-three surface Sediments were collected to investigate the element concentration based Sediment Pollution and potential ecological risk status of the Pulicat lagoon, southeast coast of India. The textural characteristics, Fe and Mn concentration in the surface Sediments are chiefly controlled by the confluence of riverine inputs and vicinity of the marine environment. The varied distribution of CaCO3 concentration is due to the depth of the lagoon followed by the sand and silty sand characteristics of the substratum. The surface Sediments are derived from riverine sources. Sediment Pollution Index (SPI), Potential Ecological Risk Index of the Sediments suggests that they are falling under less polluted and low potential ecological risk category.
-
Trace element concentrations in reef associated Sediments of Koswari Island, Gulf of Mannar biosphere reserve, southeast coast of India.
Marine pollution bulletin, 2017Co-Authors: S. Krishnakumar, S Ramasamy, N Chandrasekar, T Simon Peter, V Gopal, Prince S Godson, N. S. MageshAbstract:Extensive field work was conducted in order to assess the Sediment Pollution level and potential ecological risk on coral reef ecosystem. Thirty three surface sample was collected using grid sampling technique. The calcium carbonate and organic matter were primarily controlled by the distribution of coral rubbles and seagrass meadows. The concentration of trace elements is higher than the crustal average in few locations and the same result was derived from index calculations. However, the significant concentration of lead was observed throughout the study area. The elevated level of lead is probably due to coal incinerating power plants, and confluence of urban runoff from the nearby coastal areas. Based on the Sediment Pollution index, the majority of the Sediments belongs to highly polluted to dangerously polluted category. The ecological risk indicates that the Sediments are under low risk to moderate risk category and this result was proved by correlation analysis.
-
Spatial risk assessment and trace element concentration in reef associated Sediments of Van Island, southern part of the Gulf of Mannar, India.
Marine pollution bulletin, 2016Co-Authors: S. Krishnakumar, S Ramasamy, N Chandrasekar, V Gopal, Prince S Godson, T Simon Peter, N. S. MageshAbstract:Forty eight surface Sediment samples were collected from the vicinity of Van Island in order to assess the Sediment Pollution level and potential ecological risk on coral reef ecosystem. The analytical and correlation results indicate a distribution of elements is chiefly controlled by the CaCO3 and OM. The enrichment factor and geoaccumulation index show the elevated level of Pb in the surface Sediments is due to application of lead petrol and coal incinerating power plants. The Sediment Pollution index reveals that majority of the Sediments falling under highly polluted Sediment category (35.4%) followed by moderately polluted (25%) and dangerous Sediment category (14.58%). The potential ecological risk suggests that nearly 66.6% of the samples falling under the low risk category, moderate risk category (20.8%) followed by considerable risk category (8.33%) and very high risk category (4.1%). The accumulation level of trace elements clearly suggests that the coral reef ecosystem is under low risk.
Joana Larreta - One of the best experts on this subject based on the ideXlab platform.
-
Source characterization and spatio–temporal evolution of the metal Pollution in the Sediments of the Basque estuaries (Bay of Biscay)
Marine Pollution Bulletin, 2012Co-Authors: Irati Legorburu, José Germán Rodríguez, Ángel Borja, Iratxe Menchaca, Oihana Solaun, Victoriano Valencia, Ibon Galparsoro, Joana LarretaAbstract:According to Water Framework Directive requirements, Member States must identify and analyze effects derived from human pressures in aquatic systems. As different kind of pressures can impact water bodies at different scales, analyses of spatio-temporal evolution of water bodies becomes essential in order to understand ecosystem responses. In this investigation, an analysis of spatio-temporal evolution of Sedimentary metal Pollution (Cd, Cr, Cu, Hg, Ni, Pb, Zn) in 12 Basque estuaries (Bay of Biscay) is presented. Data collected in extensive sampling surveys is the basis for the GIS-based statistical approach used. The implementation of Pollution abatement measures is reflected in a long-term decontamination process, mostly evident in estuaries with highest historical Sediment Pollution levels. Spatial evolution is determined by either naturally occurring or human driven processes. Such spatial processes are more obviously being reflected in estuaries with lower historical Sediment Pollution levels.
-
Source characterization and spatio-temporal evolution of the metal Pollution in the Sediments of the Basque estuaries (Bay of Biscay).
Marine pollution bulletin, 2012Co-Authors: Irati Legorburu, José Germán Rodríguez, Ángel Borja, Iratxe Menchaca, Oihana Solaun, Victoriano Valencia, Ibon Galparsoro, Joana LarretaAbstract:According to Water Framework Directive requirements, Member States must identify and analyze effects derived from human pressures in aquatic systems. As different kind of pressures can impact water bodies at different scales, analyses of spatio-temporal evolution of water bodies becomes essential in order to understand ecosystem responses. In this investigation, an analysis of spatio-temporal evolution of Sedimentary metal Pollution (Cd, Cr, Cu, Hg, Ni, Pb, Zn) in 12 Basque estuaries (Bay of Biscay) is presented. Data collected in extensive sampling surveys is the basis for the GIS-based statistical approach used. The implementation of Pollution abatement measures is reflected in a long-term decontamination process, mostly evident in estuaries with highest historical Sediment Pollution levels. Spatial evolution is determined by either naturally occurring or human driven processes. Such spatial processes are more obviously being reflected in estuaries with lower historical Sediment Pollution levels.
Yohei Nakamura - One of the best experts on this subject based on the ideXlab platform.
-
Sediment Pollution impacts sensory ability and performance of settling coral-reef fish
Oecologia, 2016Co-Authors: J. Jack O’connor, David Lecchini, Hayden J. Beck, Gwenael Cadiou, Gael Lecellier, David J. Booth, Yohei NakamuraAbstract:Marine organisms are under threat globally from a suite of anthropogenic sources, but the current emphasis on global climate change has deflected the focus from local impacts. While the effect of increased Sedimentation on the settlement of coral species is well studied, little is known about the impact on larval fish. Here, the effect of a laterite “red soil” Sediment pollutant on settlement behaviour and post-settlement performance of reef fish was tested. In aquarium tests that isolated sensory cues, we found significant olfaction-based avoidance behaviour and disruption of visual cue use in settlement-stage larval fish at 50 mg L^−1, a concentration regularly exceeded in situ during rain events. In situ light trap catches showed lower abundance and species richness in the presence of red soil, but were not significantly different due to high variance in the data. Prolonged exposure to red soil produced altered olfactory cue responses, whereby fish in red soil made a likely maladaptive choice for dead coral compared to controls where fish chose live coral. Other significant effects of prolonged exposure included decreased feeding rates and body condition. These effects on fish larvae reared over 5 days occurred in the presence of a minor drop in pH and may be due to the chemical influence of the Sediment. Our results show that Sediment Pollution of coral reefs may have more complex effects on the ability of larval fish to successfully locate suitable habitat than previously thought, as well as impacting on their post-settlement performance and, ultimately, recruitment success.
-
Sediment Pollution impacts sensory ability and performance of settling coral‑reef fish
Oecologia, 2016Co-Authors: J Jack O 'connor, David Lecchini, Gwenael Cadiou, Gael Lecellier, Hayden Beck, David Booth, Yohei NakamuraAbstract:Marine organisms are under threat globally from a suite of anthropogenic sources, but the current emphasis on global climate change has deflected the focus from local impacts. While the effect of increased Sedimentation on the settlement of coral species is well studied, little is known about the impact on larval fish. Here, the effect of a laterite “red soil” Sediment pollutant on settlement behaviour and post-settlement performance of reef fish was tested. In aquarium tests that isolated sensory cues, we found significant olfaction-based avoidance behaviour and disruption of visual cue use in settlement-stage larval fish at 50 mg L−1, a concentration regularly exceeded in situ during rain events. In situ light trap catches showed lower abundance and species richness in the presence of red soil, but were not significantly different due to high variance in the data. Prolonged exposure to red soil produced altered olfactory cue responses, whereby fish in red soil made a likely maladaptive choice for dead coral compared to controls where fish chose live coral. Other significant effects of prolonged exposure included decreased feeding rates and body condition. These effects on fish larvae reared over 5 days occurred in the presence of a minor drop in pH and may be due to the chemical influence of the Sediment. Our results show that Sediment Pollution of coral reefs may have more complex effects on the ability of larval fish to successfully locate suitable habitat than previously thought, as well as impacting on their post-settlement performance and, ultimately, recruitment success.
S. Krishnakumar - One of the best experts on this subject based on the ideXlab platform.
-
A baseline study on trace element based Sediment Pollution and potential ecological risk of reef Sediments of Musal, Manoli and Manoli putti Islands, Gulf of Mannar, India
Marine pollution bulletin, 2018Co-Authors: P. Saravanan, D. Pradhap, S. Krishnakumar, Judith D. Silva, A. Vidyasakar, Merin Sackaria, S. Godson, K. Arumugam, N. S. MageshAbstract:The aim of the present study is to assess the baseline level of the trace element, Sediment Pollution and potential ecological risk of reef associated Sediments of Musal, Manoli and Manoli putti Islands, Gulf of Mannar, India. The grain size distribution of the Sediments is chiefly controlled by corals and broken shell debris. The distribution of lithoclastic fractions and element concentration are most probably derived from longshore Sediment transport and fluvial process from nearby mainland. The enrichment of organic matter is chiefly controlled by mangrove litters and sea grasses. The concentration of lead in the marine Sediments is subjected to Sediment matrix, vicinity of the local pollutant sources and distance from the mainland coast. The ecological risk assessment clearly reveals that the Sediments belong to the low risk category.
-
Elemental concentration based potential ecological risk (PER) status of the surface Sediments, Pulicat lagoon, Southeast coast of India.
Marine pollution bulletin, 2018Co-Authors: P. Saravanan, D. Pradhap, S. Krishnakumar, Judith D. Silva, K. Arumugam, N. S. Magesh, S. SrinivasaluAbstract:Abstract Eighty-three surface Sediments were collected to investigate the element concentration based Sediment Pollution and potential ecological risk status of the Pulicat lagoon, southeast coast of India. The textural characteristics, Fe and Mn concentration in the surface Sediments are chiefly controlled by the confluence of riverine inputs and vicinity of the marine environment. The varied distribution of CaCO3 concentration is due to the depth of the lagoon followed by the sand and silty sand characteristics of the substratum. The surface Sediments are derived from riverine sources. Sediment Pollution Index (SPI), Potential Ecological Risk Index of the Sediments suggests that they are falling under less polluted and low potential ecological risk category.
-
Trace element concentrations in reef associated Sediments of Koswari Island, Gulf of Mannar biosphere reserve, southeast coast of India.
Marine pollution bulletin, 2017Co-Authors: S. Krishnakumar, S Ramasamy, N Chandrasekar, T Simon Peter, V Gopal, Prince S Godson, N. S. MageshAbstract:Extensive field work was conducted in order to assess the Sediment Pollution level and potential ecological risk on coral reef ecosystem. Thirty three surface sample was collected using grid sampling technique. The calcium carbonate and organic matter were primarily controlled by the distribution of coral rubbles and seagrass meadows. The concentration of trace elements is higher than the crustal average in few locations and the same result was derived from index calculations. However, the significant concentration of lead was observed throughout the study area. The elevated level of lead is probably due to coal incinerating power plants, and confluence of urban runoff from the nearby coastal areas. Based on the Sediment Pollution index, the majority of the Sediments belongs to highly polluted to dangerously polluted category. The ecological risk indicates that the Sediments are under low risk to moderate risk category and this result was proved by correlation analysis.
-
Spatial risk assessment and trace element concentration in reef associated Sediments of Van Island, southern part of the Gulf of Mannar, India.
Marine pollution bulletin, 2016Co-Authors: S. Krishnakumar, S Ramasamy, N Chandrasekar, V Gopal, Prince S Godson, T Simon Peter, N. S. MageshAbstract:Forty eight surface Sediment samples were collected from the vicinity of Van Island in order to assess the Sediment Pollution level and potential ecological risk on coral reef ecosystem. The analytical and correlation results indicate a distribution of elements is chiefly controlled by the CaCO3 and OM. The enrichment factor and geoaccumulation index show the elevated level of Pb in the surface Sediments is due to application of lead petrol and coal incinerating power plants. The Sediment Pollution index reveals that majority of the Sediments falling under highly polluted Sediment category (35.4%) followed by moderately polluted (25%) and dangerous Sediment category (14.58%). The potential ecological risk suggests that nearly 66.6% of the samples falling under the low risk category, moderate risk category (20.8%) followed by considerable risk category (8.33%) and very high risk category (4.1%). The accumulation level of trace elements clearly suggests that the coral reef ecosystem is under low risk.
Dirk Verschuren - One of the best experts on this subject based on the ideXlab platform.
-
impact of soil erosion in disturbed tributary drainages on the benthic invertebrate fauna of lake tanganyika east africa
Biological Conservation, 2003Co-Authors: Hilde Eggermont, Dirk VerschurenAbstract:We analysed the species diversity and distribution of recently buried remains of larval Chironomidae (Insecta: non-biting midges) in bottom environments of Lake Tanganyika adjacent to pristine and disturbed tributary drainages, to investigate the ecological impact of Sediment Pollution caused by anthropogenic soil erosion. Within each of three drainage size classes (<10, 30–50, 50–162 km2), disturbance has resulted in similar shifts in chironomid species composition which appear to reflect expansion of coarse-grained, low-organic substrates into deeper water, at the expense of the soft organic muds which characterise the deep-water environment. Because the area of habitable lake bottom in Lake Tanganyika is bounded from below by the oxycline, these results indicate that Sediment Pollution negatively impacts the oxygenated deep-water environment of Lake Tanganyika, and that intensifying soil erosion in tributary drainages may eventually threaten the survival of endemic fish and mollusc species dependent on the habitat it provides. This study establishes the value of sub-fossil Chironomidae as biological indicators of ecosystem health in the large lakes of East Africa.
-
Impact of soil erosion in disturbed tributary drainages on the benthic invertebrate fauna of Lake Tanganyika, East Africa
Biological Conservation, 2003Co-Authors: Hilde Eggermont, Dirk VerschurenAbstract:We analysed the species diversity and distribution of recently buried remains of larval Chironomidae (Insecta: non-biting midges) in bottom environments of Lake Tanganyika adjacent to pristine and disturbed tributary drainages, to investigate the ecological impact of Sediment Pollution caused by anthropogenic soil erosion. Within each of three drainage size classes (