dc.contributor.author | Green, Derek J | |
dc.contributor.author | Duffy, Mark | |
dc.contributor.author | Janz, David M | |
dc.contributor.author | McCullum, Kevin | |
dc.contributor.author | Carrière, Gary | |
dc.contributor.author | Jardine, Timothy D | |
dc.date.accessioned | 2021-07-27T00:21:03Z | |
dc.date.available | 2021-07-27T00:21:03Z | |
dc.date.issued | 2016 | |
dc.identifier.issn | 0090-4341 | |
dc.identifier.doi | 10.1007/s00244-016-0287-3 | |
dc.identifier.uri | http://hdl.handle.net/10072/406342 | |
dc.description.abstract | Mercury (Hg) contamination can pose risks to human and animal health as well as commercial fisheries. Reservoir construction in riverine systems produces flooded conditions amenable to Hg(II)-methylating bacteria, which can transform this relatively benign environmental contaminant into the bioaccumulative, environmentally relevant, and neurotoxic methyl-Hg (MeHg). Hg concentrations ([Hg]) in fishes from reservoirs can take decades to decrease to pre-dam levels, but less is known about Hg exported downstream and its dynamics within downstream fish populations. We examined and compared the multidecadal rates of biotic [Hg] decrease and contemporary factors affecting [Hg] in fish collected from a hydroelectric reservoir (Tobin Lake) and a related downstream fishery (Cumberland Lake) along the Saskatchewan River, Canada. Rates of [Hg] decrease were considered in four species—northern pike (Esox lucius), sauger (Sander canadensis), goldeye (Hiodon alosoides), and walleye (S. vitreus)—all of which showed a significant decrease over time (p < 0.001) and are now lower than Health Canada consumption guidelines (0.5 μg/g). Rates of decrease ranged from 0.5 to 3.9 %/year and were similar between sites in the cases of northern pike and sauger. Contemporary factors affecting [Hg] in walleye collected downstream include fish length (p < 0.001), fish age (p < 0.001), and trophic magnification through the food web (p < 0.001), and relationships between [Hg] and trophic level in predatory and prey fish are now similar to those found in non-Hg-inundated systems at a similar latitude. Together, these results suggest connected contamination between the two sites and delineate the timeline during which [Hg] in a variety of fish species decreased to nontoxic levels in both locations. | |
dc.description.peerreviewed | Yes | |
dc.language | English | |
dc.publisher | Springer | |
dc.relation.ispartofpagefrom | 157 | |
dc.relation.ispartofpageto | 170 | |
dc.relation.ispartofissue | 2 | |
dc.relation.ispartofjournal | Archives of Environmental Contamination and Toxicology | |
dc.relation.ispartofvolume | 71 | |
dc.subject.fieldofresearch | Marine and estuarine ecology (incl. marine ichthyology) | |
dc.subject.fieldofresearch | Fisheries sciences | |
dc.subject.fieldofresearchcode | 310305 | |
dc.subject.fieldofresearchcode | 3005 | |
dc.subject.keywords | Science & Technology | |
dc.subject.keywords | Life Sciences & Biomedicine | |
dc.subject.keywords | Environmental Sciences | |
dc.subject.keywords | Toxicology | |
dc.subject.keywords | Environmental Sciences & Ecology | |
dc.title | Historical and contemporary patterns of mercury in a hydroelectric reservoir and downstream fishery: Concentration decline in water and fishes | |
dc.type | Journal article | |
dc.type.description | C1 - Articles | |
dcterms.bibliographicCitation | Green, DJ; Duffy, M; Janz, DM; McCullum, K; Carrière, G; Jardine, TD, Historical and contemporary patterns of mercury in a hydroelectric reservoir and downstream fishery: Concentration decline in water and fishes, Archives of Environmental Contamination and Toxicology, 2016, 71 (2), pp. 157-170 | |
dcterms.dateAccepted | 2016-05-18 | |
dc.date.updated | 2021-07-27T00:17:22Z | |
gro.hasfulltext | No Full Text | |
gro.griffith.author | Jardine, Timothy | |