Mercury and selenium concentrations in fishes of the Upper Colorado River Basin, southwestern United States: A retrospective assessment


Autoři: Natalie K. Day aff001;  Travis S. Schmidt aff002;  James J. Roberts aff002;  Barbara C. Osmundson aff003;  James J. Willacker aff004;  Collin A. Eagles-Smith aff004
Působiště autorů: U.S. Geological Survey, Southwest Biological Science Center, Moab, Utah, United States of America aff001;  U.S. Geological Survey, Colorado Water Science Center, Fort Collins, Colorado, United States of America aff002;  U.S. Fish and Wildlife Service, Grand Junction, Colorado, United States of America aff003;  U.S. Geological Survey, Forest and Rangeland Ecosystem Science Center, Corvallis, Oregon, United States of America aff004
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226824

Souhrn

Mercury (Hg) and selenium (Se) are contaminants of concern for fish in the Upper Colorado River Basin (UCRB). We explored Hg and Se in fish tissues (2,324 individuals) collected over 50 years (1962–2011) from the UCRB. Samples include native and non-native fish collected from lotic waterbodies spanning 7 major tributaries to the Colorado River. There was little variation of total mercury (THg) in fish assemblages basin-wide and only 13% (272/1959) of individual fish samples exceeded the fish health benchmark (0.27 μg THg/g ww). Most THg exceedances were observed in the White-Yampa tributary whereas the San Juan had the lowest mean THg concentration. Risks associated with THg are species specific with exceedances dominated by Colorado Pikeminnow (mean = 0.38 and standard error ± 0.08 μg THg/g ww) and Roundtail Chub (0.24 ± 0.06 μg THg/g ww). For Se, 48% (827/1720) of all individuals exceeded the fish health benchmark (5.1 μg Se/g dw). The Gunnison river had the most individual exceedances of the Se benchmark (74%) whereas the Dirty Devil had the fewest. We identified that species of management concern accumulate THg and Se to levels above risk thresholds and that fishes of the White-Yampa (THg) and Gunnison (Se) rivers are at the greatest risk in the UCRB.

Klíčová slova:

Contaminants – Freshwater fish – Metallic mercury – Rivers – Selenium – Species interactions – Toxicity – Colorado


Zdroje

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