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Willacker JJ, Eagles-Smith CA, Nelson SJ, Flanagan Pritz CM, Krabbenhoft DP. The influence of short-term temporal variability on the efficacy of dragonfly larvae as mercury biosentinels. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 867:161469. [PMID: 36632899 DOI: 10.1016/j.scitotenv.2023.161469] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 01/04/2023] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
Mercury (Hg) exposure to fish, wildlife, and humans is widespread and of global concern, thus stimulating efforts to reduce emissions. Because the relationships between rates of inorganic Hg loading, methylmercury (MeHg) production, and bioaccumulation are extremely complex and challenging to predict, there is a need for reliable biosentinels to understand the distribution of Hg in the environment and monitor the effectiveness of reduction efforts. However, it is important to assess how temporal and spatial variation at multiple scales influences the efficacy of specific biosentinels. Seasonal and interannual variation in total Hg (THg) concentrations of dragonfly larvae were examined in relation to spatial variability among 21 sites in two U.S. national parks with contrasting ecologies and Hg deposition patterns. Dragonfly THg differed among sampling events at 17 of the 21 sites, but by an average of only 20.4 % across events, compared to an average difference of 52.7 % among sites. Further, THg concentrations did not follow consistent seasonal patterns across sites or years, suggesting that the observed temporal variation was unlikely to bias monitoring efforts. Importantly, for a specific site, there was no difference in % MeHg in dragonflies among sampling events. Finally, there was significant temporal variability in the biogeochemical factors (aqueous inorganic Hg, aqueous MeHg, DOC, SO4, and pH) influencing dragonfly THg, with the importance of individual factors varying by 2.4 to 4.3-fold across sampling events. Despite these results, it is noteworthy that the observed temporal variation in dragonfly THg concentrations was neither large nor consistent enough to bias spatial assessments. Thus, although this temporal variation may provide insights into the processes influencing biological Hg concentrations, it is unlikely to impair the use of dragonflies as biosentinels for monitoring spatial or temporal patterns at scales relevant to most mitigation efforts.
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Affiliation(s)
- James J Willacker
- U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, Corvallis, OR 97331, USA.
| | - Collin A Eagles-Smith
- U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, 3200 SW Jefferson Way, Corvallis, OR 97331, USA
| | - Sarah J Nelson
- Appalachian Mountain Club, 361 Route 16, Gorham, NH 03581, USA
| | | | - David P Krabbenhoft
- U.S. Geological Survey, Upper Midwest Water Science Center, 1 Gifford Pinchot Dr, Madison, WI 53726, USA
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Mercury Induced Tissue Damage, Redox Metabolism, Ion Transport, Apoptosis, and Intestinal Microbiota Change in Red Swamp Crayfish (Procambarus clarkii): Application of Multi-Omics Analysis in Risk Assessment of Hg. Antioxidants (Basel) 2022; 11:antiox11101944. [PMID: 36290667 PMCID: PMC9598479 DOI: 10.3390/antiox11101944] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/22/2022] [Accepted: 09/24/2022] [Indexed: 11/22/2022] Open
Abstract
As one of the most toxic elements, mercury (Hg) is a widespread toxicant in aquatic environments. Crayfish are considered suitable for indicating the impact of heavy metals on aquatic crustaceans. Nevertheless, Hg toxicity on Procambarus clarkii is largely unknown. In this research, the acute Hg-induced alterations of biochemical responses, histopathology, hepatopancreatic transcriptome, and intestinal microbiome of Procambarus clarkii were studied. Firstly, Hg induced significant changes in reactive oxygen species (ROS) and malonaldehyde (MDA) content as well as antioxidant enzyme activity. Secondly, Hg exposure caused structural damage to the hepatopancreas (e.g., vacuolization of the epithelium and dilatation of the lumen) as well as to the intestines (e.g., dysregulation of lamina epithelialises and extension of lamina proprias). Thirdly, after treatment with three different concentrations of Hg, RNA-seq assays of the hepatopancreas revealed a large number of differentially expressed genes (DEGs) linked to a specific function. Among the DEGs, a lot of redox metabolism- (e.g., ACOX3, SMOX, GPX3, GLO1, and P4HA1), ion transport- (e.g., MICU3, MCTP, PYX, STEAP3, and SLC30A2), drug metabolism- (e.g., HSP70, HSP90A, CYP2L1, and CYP9E2), immune response- (e.g., SMAD4, HDAC1, and DUOX), and apoptosis-related genes (e.g., CTSL, CASP7, and BIRC2) were identified, which suggests that Hg exposure may perturb the redox equilibrium, disrupt the ion homeostasis, weaken immune response and ability, and cause apoptosis. Fourthly, bacterial 16S rRNA gene sequencing showed that Hg exposure decreased bacterial diversity and dysregulated intestinal microbiome composition. At the phylum level, there was a marked decrease in Proteobacteria and an increase in Firmicutes after exposure to high levels of Hg. With regards to genus, abundances of Bacteroides, Dysgonomonas, and Arcobacter were markedly dysregulated after Hg exposures. Our findings elucidate the mechanisms involved in Hg-mediated toxicity in aquatic crustaceans at the tissue, cellular, molecular as well as microbial levels.
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Proximity to Riparian Wetlands Increases Mercury Burden in Fish in the Upper St. Lawrence River. WATER 2022. [DOI: 10.3390/w14010070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Mercury deposited in the Upper St. Lawrence River watershed by atmospheric deposition accumulated in riparian wetlands and is at risk of remobilization due to water level fluctuations. To examine if riparian wetlands are a source of mercury to fish, 174 yellow perch (Perca flavescens) and 145 round gobies (Neogobius melanostomus) were collected in 2019 from eight wetland and seven non-wetland habitats throughout the Upper St. Lawrence River. Mercury levels were significantly (p < 0.01) higher in fish collected from wetlands than those collected from non-wetland habitats for both yellow perch and round goby. Perch had mercury concentrations of 74.5 ± 35.4 ng/g dry wt in wetlands compared to 59.9 ± 23.0 ng/g dry wt in non-wetlands. Goby had mercury concentrations of 55.4 ± 13.8 ng/g dry wt in wetlands and non-wetland concentrations of 41.0 ± 14.0 ng/g dry wt. Riparian wetlands are areas of elevated mercury methylation and mobilization in the Upper St. Lawrence River and consequences to predators should be considered from the perspective of both wildlife preservation as well as fish consumption advisories for public health concerns.
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Sun S, Wang N, Shi X. In vivo visualization assay to evaluate the effects of maternal exposure to mercury on offspring bioaccumulation in the oriental river prawn (Macrobrachium nipponense). CHEMOSPHERE 2021; 270:129440. [PMID: 33412353 DOI: 10.1016/j.chemosphere.2020.129440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/21/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
Mercury (Hg) is a persistent pollutant that accumulates in aquatic animals. However, studies related to understand how gonad tissue of this species responds to mercury exposure and elucidation of mercury bioaccumulation in crustacean offspring by cross-generational, are still sparse. The present study aimed to assess the bioaccumulation of Hg2+in vivo in prawn offspring by a specific aggregation-induced emission fluorogen (AIEgen). The 96 h median lethal concentration (LC50) values of mercury to the juveniles were 0.072 mg/L. Hg2+ reduced growth performance, damaged oocyte quality, and inhibited ovary maturation, thus inhibiting gonadal maturation in intact prawns. F1 offspring were exposed to Hg2+ by direct transfer from their F0 parents, as shown by the distribution of mercury in gonads and fertilized eggs. In the medium containing oriental river prawn larvae, the Hg2+ concentration decreased rapidly, indicating fast initial larval uptake of Hg2+. Due to metal ion triggered AIE activity, analysis of fluorescence images showed that prawn offspring accumulated Hg2+ via maternal transfer, and there was a relationship among the photoluminescence intensity, the AIEgen concentration, and mercury levels. The quantitative detection of Hg2+ absorption from prawn larvae by the AIEgen represents a novel analytical technique to understand the dynamics of Hg2+ between maternal and offspring.
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Affiliation(s)
- Shengming Sun
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai, 201306, China; Hubei International Science and Technology Cooperation Base of Fish Passage, China Three Gorges University, Yichang, 443002, China.
| | - Ning Wang
- Wuxi Fishery College, Nanjing Agricultural University, Wuxi, 214081, PR China
| | - Xiaotao Shi
- Hubei International Science and Technology Cooperation Base of Fish Passage, China Three Gorges University, Yichang, 443002, China
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Larson JH, Maki RP, Christensen VG, Hlavacek EJ, Sandheinrich MB, LeDuc JF, Kissane C, Knights BC. Mercury and water level management in lakes of northern Minnesota. Ecosphere 2021. [DOI: 10.1002/ecs2.3465] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- James H. Larson
- U.S. Geological Survey Upper Midwest Environmental Sciences Center La Crosse Wisconsin54603USA
| | - Ryan P. Maki
- National Park Service Voyageurs National Park International Falls Minnesota56649USA
| | | | - Enrika J. Hlavacek
- U.S. Geological Survey Upper Midwest Environmental Sciences Center La Crosse Wisconsin54603USA
| | - Mark B. Sandheinrich
- River Studies Center University of Wisconsin‐La Crosse La Crosse Wisconsin54601USA
| | - Jaime F. LeDuc
- National Park Service Voyageurs National Park International Falls Minnesota56649USA
| | - Claire Kissane
- National Park Service Voyageurs National Park International Falls Minnesota56649USA
| | - Brent C. Knights
- U.S. Geological Survey Upper Midwest Environmental Sciences Center La Crosse Wisconsin54603USA
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Millard G, Driscoll C, Montesdeoca M, Yang Y, Taylor M, Boucher S, Shaw A, Richter W, Paul E, Parker C, Yokota K. Patterns and trends of fish mercury in New York State. ECOTOXICOLOGY (LONDON, ENGLAND) 2020; 29:1709-1720. [PMID: 31955284 DOI: 10.1007/s10646-020-02163-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 01/04/2020] [Indexed: 06/10/2023]
Abstract
In the mid-2000s a survey was conducted to evaluate fish mercury in lakes across New York State. Approximately 10 years later a second survey examining adult sportfish from 103 lakes and reservoirs was conducted to evaluate the response of fish mercury to recent declines in US mercury emissions. Of those lakes, 43 were part of the earlier survey and were examined to determine if mercury concentrations in four popular sport species, Yellow Perch, Walleye, and Small- and Largemouth Bass, declined in response to decreasing emissions. Water samples were also collected at 35 of these lakes and analyzed for mercury, methylmercury and other analytes. The Adirondack and Catskill regions remain biological mercury hotspots with elevated concentrations in fish. The most widely sampled species, Yellow Perch, showed significant increases in mercury in the Northeast and West regions of New York State over the past decade. The increases in Yellow Perch mercury is not consistent with significant reductions in water concentrations of both total and methylmercury observed corresponding in lake water samples. This discrepancy suggests watershed and in-lake processes beyond mercury emissions, such as recovery from acid deposition, impacts from climate change, or changes in food web structure may be controlling fish mercury concentrations. These results demonstrate a need for a consistent, long-term program to monitor fish mercury to inform the status of mercury contamination in New York State.
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Affiliation(s)
- Geoffrey Millard
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, 13244, USA.
- National Risk Management Research Laboratory, US Environmental Protection Agency, Cincinnati, OH, 45244, USA.
| | - Charles Driscoll
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, 13244, USA
| | - Mario Montesdeoca
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, 13244, USA
| | - Yang Yang
- Department of Forest and Natural Resources Management, State University of New York College of Environmental Science and Forestry, Syracuse, NY, 13210, USA
| | - Mariah Taylor
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, 13244, USA
| | - Stephen Boucher
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, 13244, USA
| | - Amy Shaw
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, 13244, USA
| | - Wayne Richter
- Division of Fish and Wildlife, New York State Department of Environmental Conservation, Albany, NY, 12233, USA
- Department of Biology, Skidmore College, Saratoga Springs, NY, 12866, USA
| | - Eric Paul
- Division of Fish and Wildlife, New York State Department of Environmental Conservation, Rome, NY, 13440, USA
| | - Colleen Parker
- Department of Biology, State University of New York College at Oneonta, Oneonta, NY, 13820, USA
| | - Kiyoko Yokota
- Department of Biology, State University of New York College at Oneonta, Oneonta, NY, 13820, USA
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