Pub Date : 2009-12-09DOI: 10.1080/15555270903358428
Spencer A. Peterson, N. Ralston, P. Whanger, James E. Oldfield, Wayne D. Mosher
This review addresses the effects of mercury (Hg) in fish as it relates to the health of the fish themselves as well as potential risks of toxicity in wildlife and humans that consume fish. In particular, it addresses selenium (Se) as a bioindicator of susceptibility to harmful effects of Hg exposures and evaluates how Se moderates the toxic effects of Hg in a variety of test animals, emphasizing the importance of these potential effects in fish. A major conclusion of this review is that Hg toxicity risks to animal life cannot be accurately assessed without considering the moderating effects of Se. Therefore, Se:Hg molar ratios and their mathematical inverse are important factors that need to be considered when assessing risks from Hg exposures because exposures are related directly to toxicity outcome. In addition, actual measurement of both beneficial nutrients (e.g., Se, omega-3 fatty acids) and contaminants (e.g., Hg, polychlorinated biphenyls [PCB]) in fish tissue, rather than gross associations betw...
{"title":"Selenium and Mercury Interactions with Emphasis on Fish Tissue","authors":"Spencer A. Peterson, N. Ralston, P. Whanger, James E. Oldfield, Wayne D. Mosher","doi":"10.1080/15555270903358428","DOIUrl":"https://doi.org/10.1080/15555270903358428","url":null,"abstract":"This review addresses the effects of mercury (Hg) in fish as it relates to the health of the fish themselves as well as potential risks of toxicity in wildlife and humans that consume fish. In particular, it addresses selenium (Se) as a bioindicator of susceptibility to harmful effects of Hg exposures and evaluates how Se moderates the toxic effects of Hg in a variety of test animals, emphasizing the importance of these potential effects in fish. A major conclusion of this review is that Hg toxicity risks to animal life cannot be accurately assessed without considering the moderating effects of Se. Therefore, Se:Hg molar ratios and their mathematical inverse are important factors that need to be considered when assessing risks from Hg exposures because exposures are related directly to toxicity outcome. In addition, actual measurement of both beneficial nutrients (e.g., Se, omega-3 fatty acids) and contaminants (e.g., Hg, polychlorinated biphenyls [PCB]) in fish tissue, rather than gross associations betw...","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"318-334"},"PeriodicalIF":0.0,"publicationDate":"2009-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903358428","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-09DOI: 10.1080/15555270903458301
R. Epting, R. S. Delotelle
Nestling behavior in five populations of red-cockaded woodpeckers (Picoides borealis) in peninsula Florida from 1997–2003 and 2007 revealed novel mechanisms and behavioral positioning of crossed, disproportionately long necks in all nestlings (Stage I, 10–17 days of age). Nest observations in Stage I showed that the crossed neck behavior occurred in all broods of two or more, and facilitated dominant nestlings to beg sooner, reach higher, and to knock aside their smaller siblings, effectively controlling the central point below the nest cavity entrance. Stage II and III nestlings (11–17 and >18 days, respectively) were generally satiate in the cavity bottom on most occasions. Compared to satiate nests, those with elevated levels of aggressive behavior fledged significantly fewer young. Aggressive positioning behavior, fighting, and pecking occurred in Stage I...
{"title":"Competitive positioning as an indicator of nestling survival in red-cockaded woodpeckers.","authors":"R. Epting, R. S. Delotelle","doi":"10.1080/15555270903458301","DOIUrl":"https://doi.org/10.1080/15555270903458301","url":null,"abstract":"Nestling behavior in five populations of red-cockaded woodpeckers (Picoides borealis) in peninsula Florida from 1997–2003 and 2007 revealed novel mechanisms and behavioral positioning of crossed, disproportionately long necks in all nestlings (Stage I, 10–17 days of age). Nest observations in Stage I showed that the crossed neck behavior occurred in all broods of two or more, and facilitated dominant nestlings to beg sooner, reach higher, and to knock aside their smaller siblings, effectively controlling the central point below the nest cavity entrance. Stage II and III nestlings (11–17 and >18 days, respectively) were generally satiate in the cavity bottom on most occasions. Compared to satiate nests, those with elevated levels of aggressive behavior fledged significantly fewer young. Aggressive positioning behavior, fighting, and pecking occurred in Stage I...","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"335-355"},"PeriodicalIF":0.0,"publicationDate":"2009-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903458301","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-09DOI: 10.1080/15555270903448682
N. Ralston
This is the second issue of Environmental Bioindicators presenting invited articles describing interactions between methylmercury (MeHg) and selenium (Se). The findings described in these articles confirm the importance of using Se as a bioindicator of environmental and physiological susceptibility to Hg exposure, since these and similar studies indicate the relationship between Hg toxicology and the Se-physiology pathways are important aspects of the environmental Hg issue. The results of these multi-disciplinary studies of Hg-Se interactions coincide and complement one another, and the status of the science on this issue appears to be making the transition from “converging research” to “confirmatory studies”. It is gratifying to note that progress in this research area is improving both understanding of both MeHg toxicity and Se physiology. Although sulfur (S) and Se are chemically similar, Hg’s affinity for Se is ∼10 6 greater than Hg’s affinity for sulfur; ([HgSe]/[Hg 2+ ][Se]=10 45 M) vs. ([HgS]/[Hg 2+ ][S]=10 39 M) (Dyrssen and Wedborg 1991). Although the affinities between the organic forms of Hg, S, and Se are known to be lower than those of the inorganic forms, the relative affinities remain similar. Therefore, it is increasingly clear that most if not all of the adverse impacts of high MeHg exposures occur as a result of pathological effects secondary to impaired
这是《环境生物指标》的第二期，介绍了描述甲基汞(MeHg)和硒(Se)之间相互作用的特邀文章。这些研究结果证实了使用硒作为汞暴露环境和生理敏感性的生物指标的重要性，因为这些研究和类似的研究表明，汞毒理学和硒生理途径之间的关系是环境汞问题的重要方面。这些关于汞硒相互作用的多学科研究的结果是一致的，相互补充的，在这个问题上的科学地位似乎正在从“趋同研究”过渡到“验证研究”。令人欣慰的是，这一研究领域的进展正在提高对甲基汞毒性和硒生理的理解。虽然硫(S)和硒的化学性质相似，但汞对硒的亲和力比汞对硫的亲和力大~ 10.6;([HgS]/[Hg 2+][Se]=10 45 M) vs ([HgS]/[Hg 2+][S]=10 39 M) (Dyrssen and Wedborg 1991)。虽然已知有机形式的Hg、S和Se之间的亲和力低于无机形式，但相对亲和力仍然相似。因此，越来越清楚的是，高甲基汞暴露的大多数不利影响(如果不是全部的话)是继发于受损的病理效应的结果
{"title":"Introduction to 2nd Issue on Special Topic: Selenium and Mercury as Interactive Environmental Indicators","authors":"N. Ralston","doi":"10.1080/15555270903448682","DOIUrl":"https://doi.org/10.1080/15555270903448682","url":null,"abstract":"This is the second issue of Environmental Bioindicators presenting invited articles describing interactions between methylmercury (MeHg) and selenium (Se). The findings described in these articles confirm the importance of using Se as a bioindicator of environmental and physiological susceptibility to Hg exposure, since these and similar studies indicate the relationship between Hg toxicology and the Se-physiology pathways are important aspects of the environmental Hg issue. The results of these multi-disciplinary studies of Hg-Se interactions coincide and complement one another, and the status of the science on this issue appears to be making the transition from “converging research” to “confirmatory studies”. It is gratifying to note that progress in this research area is improving both understanding of both MeHg toxicity and Se physiology. Although sulfur (S) and Se are chemically similar, Hg’s affinity for Se is ∼10 6 greater than Hg’s affinity for sulfur; ([HgSe]/[Hg 2+ ][Se]=10 45 M) vs. ([HgS]/[Hg 2+ ][S]=10 39 M) (Dyrssen and Wedborg 1991). Although the affinities between the organic forms of Hg, S, and Se are known to be lower than those of the inorganic forms, the relative affinities remain similar. Therefore, it is increasingly clear that most if not all of the adverse impacts of high MeHg exposures occur as a result of pathological effects secondary to impaired","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"286-290"},"PeriodicalIF":0.0,"publicationDate":"2009-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903448682","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-09DOI: 10.1080/15555270903404651
F. Huggins, S. Raverty, O. Nielsen, N. Sharp, J. Robertson, N. Ralston
High dietary methylmercury (MeHg) exposures are often associated with increased accumulation of selenium (Se), particularly in tissues with rapid rates of selenocysteine synthesis. Conversely, increased dietary Se intakes result in increased accumulation of Hg, possibly because of mutual sequestration in insoluble HgSe complexes. In the current study, results from Hg X-ray absorption fine structure (XAFS) spectroscopy of lyophilized liver and pituitary tissues from beluga whales, coupled with instrumental neutron activation analysis determinations of their Hg and Se contents, show that Hg occurs as a mixture of HgS and HgSe. In the liver tissues studied, the proportion of Hg as HgSe varied from 38% to 77%, whereas it was higher in the pituitary tissues (85%–90%). Selenium XAFS spectra showed that Se as HgSe also varied from dominant to minor among Se forms in the same tissues. The distribution of Se between HgSe and a biological form was estimated from analysis of the Hg derivative XANES spectra and from ...
{"title":"An XAFS Investigation of Mercury and Selenium in Beluga Whale Tissues","authors":"F. Huggins, S. Raverty, O. Nielsen, N. Sharp, J. Robertson, N. Ralston","doi":"10.1080/15555270903404651","DOIUrl":"https://doi.org/10.1080/15555270903404651","url":null,"abstract":"High dietary methylmercury (MeHg) exposures are often associated with increased accumulation of selenium (Se), particularly in tissues with rapid rates of selenocysteine synthesis. Conversely, increased dietary Se intakes result in increased accumulation of Hg, possibly because of mutual sequestration in insoluble HgSe complexes. In the current study, results from Hg X-ray absorption fine structure (XAFS) spectroscopy of lyophilized liver and pituitary tissues from beluga whales, coupled with instrumental neutron activation analysis determinations of their Hg and Se contents, show that Hg occurs as a mixture of HgS and HgSe. In the liver tissues studied, the proportion of Hg as HgSe varied from 38% to 77%, whereas it was higher in the pituitary tissues (85%–90%). Selenium XAFS spectra showed that Se as HgSe also varied from dominant to minor among Se forms in the same tissues. The distribution of Se between HgSe and a biological form was estimated from analysis of the Hg derivative XANES spectra and from ...","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"291-302"},"PeriodicalIF":0.0,"publicationDate":"2009-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903404651","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-09DOI: 10.1080/15555270903472195
E. Zillioux
{"title":"Environmental Bioindicators (EBI) to Environmental Indicators (EI) and other Developments: the Evolution of a Journal","authors":"E. Zillioux","doi":"10.1080/15555270903472195","DOIUrl":"https://doi.org/10.1080/15555270903472195","url":null,"abstract":"","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"283-285"},"PeriodicalIF":0.0,"publicationDate":"2009-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903472195","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-09DOI: 10.1080/15555270903404750
DOUGLAS K. Stevens, Katie McDonald, N. Bishop
This study focused on evaluating the appropriateness of the State of Montana consumption guidelines for Lake Trout (Salvelinus namaycush) from Flathead Lake, Montana, USA. This lake is jointly managed by the State and the Confederated Salish and Kootenai Tribes. Thousands of lake trout are harvested by the Tribes and donated to local food banks yearly. Samples from forty-eight lake trout were analyzed for mercury, selenium and polyunsaturated fatty acids (PUFAs). Models that seek to quantify the moderating or attenuating effects of both selenium and omega-3 (n-3) PUFAs on mercury toxicity were integrated with the US Environmental Protection Agency (EPA) methods for setting consumption guidelines in an attempt to better determine “safe” consumption recommendations. Omega-3 PUFAs benefits (neurodevelopmental and cardiovascular) were balanced with mercury detriment to yield a potential net health risk/benefit. Consumption of lake trout, of any size, failed to show any predicted neurodevelopmental benefits. H...
{"title":"Are Lake Trout (Salvelinus namaycush) From Flathead Lake, Montana, USA “Safe” To Eat? An Integrated Mercury Risk Evaluation Study∗","authors":"DOUGLAS K. Stevens, Katie McDonald, N. Bishop","doi":"10.1080/15555270903404750","DOIUrl":"https://doi.org/10.1080/15555270903404750","url":null,"abstract":"This study focused on evaluating the appropriateness of the State of Montana consumption guidelines for Lake Trout (Salvelinus namaycush) from Flathead Lake, Montana, USA. This lake is jointly managed by the State and the Confederated Salish and Kootenai Tribes. Thousands of lake trout are harvested by the Tribes and donated to local food banks yearly. Samples from forty-eight lake trout were analyzed for mercury, selenium and polyunsaturated fatty acids (PUFAs). Models that seek to quantify the moderating or attenuating effects of both selenium and omega-3 (n-3) PUFAs on mercury toxicity were integrated with the US Environmental Protection Agency (EPA) methods for setting consumption guidelines in an attempt to better determine “safe” consumption recommendations. Omega-3 PUFAs benefits (neurodevelopmental and cardiovascular) were balanced with mercury detriment to yield a potential net health risk/benefit. Consumption of lake trout, of any size, failed to show any predicted neurodevelopmental benefits. H...","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"303-317"},"PeriodicalIF":0.0,"publicationDate":"2009-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903404750","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-09-04DOI: 10.1080/15555270903143366
I. Côté, M. Paddack
{"title":"‘Recycling’ Data to Derive Environmental Indicators","authors":"I. Côté, M. Paddack","doi":"10.1080/15555270903143366","DOIUrl":"https://doi.org/10.1080/15555270903143366","url":null,"abstract":"","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"195-197"},"PeriodicalIF":0.0,"publicationDate":"2009-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903143366","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-09-04DOI: 10.1080/15555270903143408
N. Belzile, Yuwei Chen, Dan Yang, H. T. Truong, Qiuyue Zhao
We present evidence of selenium bioaccumulation at lower levels of the aquatic food chain and its antagonistic effect against mercury and methyl mercury assimilation in the aquatic food web. Most of our studies were carried out in freshwater lakes of the mining region of Sudbury, Ontario, Canada where the presence of metal smelters has introduced elevated levels of selenium in the surrounding terrestrial and aquatic ecosystems. The studies with different types of aquatic organisms demonstrate a consistent inverse relationship between concentrations of mercury/methyl mercury and selenium in whole bodies (zooplankton, benthic invertebrates, mayflies and amphipods, beetle larvae and newly hatched perch) or in muscle, liver and brain (perch and walleye). This antagonistic effect was also observed in laboratory controlled experiments with the incubated soil and surface water bacterium Pseudomonas fluorescens. We also present some information on Se accumulation at different levels of the food web with samples c...
{"title":"Selenium Bioaccumulation in Freshwater Organisms and Antagonistic Effect against Mercury Assimilation","authors":"N. Belzile, Yuwei Chen, Dan Yang, H. T. Truong, Qiuyue Zhao","doi":"10.1080/15555270903143408","DOIUrl":"https://doi.org/10.1080/15555270903143408","url":null,"abstract":"We present evidence of selenium bioaccumulation at lower levels of the aquatic food chain and its antagonistic effect against mercury and methyl mercury assimilation in the aquatic food web. Most of our studies were carried out in freshwater lakes of the mining region of Sudbury, Ontario, Canada where the presence of metal smelters has introduced elevated levels of selenium in the surrounding terrestrial and aquatic ecosystems. The studies with different types of aquatic organisms demonstrate a consistent inverse relationship between concentrations of mercury/methyl mercury and selenium in whole bodies (zooplankton, benthic invertebrates, mayflies and amphipods, beetle larvae and newly hatched perch) or in muscle, liver and brain (perch and walleye). This antagonistic effect was also observed in laboratory controlled experiments with the incubated soil and surface water bacterium Pseudomonas fluorescens. We also present some information on Se accumulation at different levels of the food web with samples c...","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"203-221"},"PeriodicalIF":0.0,"publicationDate":"2009-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903143408","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-09-04DOI: 10.1080/15555270903143440
Maria da Conceição Nascimento Pinheiro, J. D. do Nascimento, Luiz Carlos de Lima Silveira, J. B. D. da Rocha, M. Aschner
Mercury (Hg) toxicity is governed by cellular thiol compounds and its capacity to generate reactive oxygen radicals and oxidative stress. Selenium (Se) plays a key role in the prevention of the toxic effects of Hg by modulating the activity of several Se-dependent enzymes, including glutathione peroxidase (GSH-Px). In addition, dietary Se can reduce Hg toxicity by directly interacting with either Hg(II) or methylmercury (MeHg) to form inert products, such as HgSe complexes.. Although experimental and environmental data have indicated a protective role for selenium against Hg toxicity, human data are more limited and somewhat conroversial In the Amazon Region of Brazil, Hg pollution is rampant as a result of gold (Au) mining and other anthropogenic factors, leading to pervasive release of large quantities of metallic Hg0 into the environment. Exposure to Hg in this region is associated with direct occupational exposure in the gold mining industry, as well as consumption by in inhabitants of riverside communities of a diet rich in MeHg-contaminated fish. Human exposure to MeHg in the Amazon through the diet has been monitored by measuring Hg and MeHg in hair samples. In this paper, we review the environmental contamination of Hg in the Amazon and detail human exposures in populations of this region. We conclude with a brief synopsis on Se levels in the Amazon population and provide a brief review of data available on the interaction between Hg and Se in this region. Overall, the literature supports the notion that low environmental Se is linked to susceptibility to Hg toxicity and that Se levels could be used as a bioindicator to monitor the health of Hg exposed subjects. However, in light of the limited human data on this subject, further epidemiological studies are needed to clarify how changes in Se levels modify the toxicity of environmental Hg.
{"title":"Mercury and Selenium - A Review on Aspects Related to the Health of Human Populations in the Amazon.","authors":"Maria da Conceição Nascimento Pinheiro, J. D. do Nascimento, Luiz Carlos de Lima Silveira, J. B. D. da Rocha, M. Aschner","doi":"10.1080/15555270903143440","DOIUrl":"https://doi.org/10.1080/15555270903143440","url":null,"abstract":"Mercury (Hg) toxicity is governed by cellular thiol compounds and its capacity to generate reactive oxygen radicals and oxidative stress. Selenium (Se) plays a key role in the prevention of the toxic effects of Hg by modulating the activity of several Se-dependent enzymes, including glutathione peroxidase (GSH-Px). In addition, dietary Se can reduce Hg toxicity by directly interacting with either Hg(II) or methylmercury (MeHg) to form inert products, such as HgSe complexes.. Although experimental and environmental data have indicated a protective role for selenium against Hg toxicity, human data are more limited and somewhat conroversial In the Amazon Region of Brazil, Hg pollution is rampant as a result of gold (Au) mining and other anthropogenic factors, leading to pervasive release of large quantities of metallic Hg0 into the environment. Exposure to Hg in this region is associated with direct occupational exposure in the gold mining industry, as well as consumption by in inhabitants of riverside communities of a diet rich in MeHg-contaminated fish. Human exposure to MeHg in the Amazon through the diet has been monitored by measuring Hg and MeHg in hair samples. In this paper, we review the environmental contamination of Hg in the Amazon and detail human exposures in populations of this region. We conclude with a brief synopsis on Se levels in the Amazon population and provide a brief review of data available on the interaction between Hg and Se in this region. Overall, the literature supports the notion that low environmental Se is linked to susceptibility to Hg toxicity and that Se levels could be used as a bioindicator to monitor the health of Hg exposed subjects. However, in light of the limited human data on this subject, further epidemiological studies are needed to clarify how changes in Se levels modify the toxicity of environmental Hg.","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 3 1","pages":"222-245"},"PeriodicalIF":0.0,"publicationDate":"2009-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903143440","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-09-04DOI: 10.1080/15555270903025456
D. Rumbold, M. Morrison, M. Bruner
To assess the ecological risk of siting a new municipal solid waste landfill near a National Wildlife Refuge in Florida, we carried out a retrospective assessment at a large waterbird colony located near an existing active landfill. Monitoring data collected over twenty years, including flight-line counts both at dawn and midday, shows the mixed-species, communal roost was active continuously from 1987 through 2007. The largest number of birds counted in any single flight-line count was 14,750 birds recorded in July 2007. The numerically dominant species recorded during flight-line counts were, in approximate order of abundance: White Ibis, (Eudocimus albus), Cattle Egret (Bubulcus ibis), Little Blue Heron (Egretta caerules), Great Egret (Ardea alba), and Tricolor Heron (E. tricolor). Breeding bird censuses revealed this site served also as a nesting colony each year since 1987; annual total nest numbers peaked in 1987 at 5,127 nests. Taxa richness increased over the monitoring period with new species nes...
{"title":"Assessing the Ecological Risk of a Municipal Solid Waste Landfill to Surrounding Wildlife: a Case Study in Florida","authors":"D. Rumbold, M. Morrison, M. Bruner","doi":"10.1080/15555270903025456","DOIUrl":"https://doi.org/10.1080/15555270903025456","url":null,"abstract":"To assess the ecological risk of siting a new municipal solid waste landfill near a National Wildlife Refuge in Florida, we carried out a retrospective assessment at a large waterbird colony located near an existing active landfill. Monitoring data collected over twenty years, including flight-line counts both at dawn and midday, shows the mixed-species, communal roost was active continuously from 1987 through 2007. The largest number of birds counted in any single flight-line count was 14,750 birds recorded in July 2007. The numerically dominant species recorded during flight-line counts were, in approximate order of abundance: White Ibis, (Eudocimus albus), Cattle Egret (Bubulcus ibis), Little Blue Heron (Egretta caerules), Great Egret (Ardea alba), and Tricolor Heron (E. tricolor). Breeding bird censuses revealed this site served also as a nesting colony each year since 1987; annual total nest numbers peaked in 1987 at 5,127 nests. Taxa richness increased over the monitoring period with new species nes...","PeriodicalId":92776,"journal":{"name":"Environmental bioindicators","volume":"4 1","pages":"246-279"},"PeriodicalIF":0.0,"publicationDate":"2009-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15555270903025456","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60026249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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