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Mercury and selenium accumulation in the Colorado River food web, Grand Canyon, USA

Overview of attention for article published in Environmental Toxicology & Chemistry, August 2015
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • One of the highest-scoring outputs from this source (#9 of 4,474)
  • High Attention Score compared to outputs of the same age (98th percentile)
  • High Attention Score compared to outputs of the same age and source (98th percentile)

Mentioned by

news
10 news outlets
blogs
4 blogs
twitter
52 tweeters
facebook
1 Facebook page

Readers on

mendeley
58 Mendeley
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Title
Mercury and selenium accumulation in the Colorado River food web, Grand Canyon, USA
Published in
Environmental Toxicology & Chemistry, August 2015
DOI 10.1002/etc.3077
Pubmed ID
Authors

David M. Walters, Emma Rosi-Marshall, Theodore A. Kennedy, Wyatt F. Cross, Colden V. Baxter

Abstract

Mercury (Hg) and selenium (Se) biomagnify in aquatic food webs and are toxic to fish and wildlife. The authors measured Hg and Se in organic matter, invertebrates, and fishes in the Colorado River food web at sites spanning 387 river km downstream of Glen Canyon Dam (AZ, USA). Concentrations were relatively high among sites compared with other large rivers (mean wet wt for 6 fishes was 0.17-1.59 μg g(-1) Hg and 1.35-2.65 μg g(-1) Se), but consistent longitudinal patterns in Hg or Se concentrations relative to the dam were lacking. Mercury increased (slope = 0.147) with δ(15) N, a metric of trophic position, indicating biomagnification similar to that observed in other freshwater systems. Organisms regularly exceeded exposure risk thresholds for wildlife and humans (6-100% and 56-100% of samples for Hg and Se, respectfully, among risk thresholds). In the Colorado River, Grand Canyon, Hg and Se concentrations pose exposure risks for fish, wildlife, and humans, and the findings of the present study add to a growing body of evidence showing that remote ecosystems are vulnerable to long-range transport and subsequent bioaccumulation of contaminants. Management of exposure risks in Grand Canyon will remain a challenge, as sources and transport mechanisms of Hg and Se extend far beyond park boundaries. Environ Toxicol Chem 2015;9999:1-10. © 2015 SETAC.

Twitter Demographics

The data shown below were collected from the profiles of 52 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 58 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Portugal 1 2%
Canada 1 2%
Brazil 1 2%
Unknown 55 95%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 16 28%
Student > Master 8 14%
Other 7 12%
Researcher 5 9%
Student > Postgraduate 5 9%
Other 11 19%
Unknown 6 10%
Readers by discipline Count As %
Agricultural and Biological Sciences 23 40%
Environmental Science 15 26%
Earth and Planetary Sciences 3 5%
Unspecified 1 2%
Nursing and Health Professions 1 2%
Other 6 10%
Unknown 9 16%

Attention Score in Context

This research output has an Altmetric Attention Score of 146. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 03 December 2015.
All research outputs
#130,465
of 15,495,746 outputs
Outputs from Environmental Toxicology & Chemistry
#9
of 4,474 outputs
Outputs of similar age
#2,483
of 240,139 outputs
Outputs of similar age from Environmental Toxicology & Chemistry
#1
of 86 outputs
Altmetric has tracked 15,495,746 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 4,474 research outputs from this source. They receive a mean Attention Score of 4.6. This one has done particularly well, scoring higher than 99% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 240,139 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 98% of its contemporaries.
We're also able to compare this research output to 86 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 98% of its contemporaries.