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X Demographics
Mendeley readers
Attention Score in Context
| Title |
Variation in δ15N and δ13C values of forages for Arctic caribou: effects of location, phenology and simulated digestion
|
|---|---|
| Published in |
Rapid Communications in Mass Spectrometry, April 2017
|
| DOI | 10.1002/rcm.7849 |
| Pubmed ID | |
| Authors |
Lindsay L. Vansomeren, Perry S. Barboza, David D. Gustine, M. Syndonia Bret‐Harte |
| Abstract |
The use of stable isotopes for dietary estimates of wildlife assumes that there are consistent differences in isotopic ratios among diet items, and that the differences in these ratios between the diet item and the animal tissues (i.e., fractionation) are predictable. However, variation in isotopic ratios and fractionation of δ(13) C and δ(15) N values among locations, seasons, and forages are poorly described for arctic herbivores especially migratory species such as caribou (Rangifer tarandus). We measured the δ(13) C and δ(15) N values of seven species of forage growing along a 200-km transect through the range of the Central Arctic caribou herd on the North Slope of Alaska over 2 years. We compared forages available at the beginning (May; n = 175) and the end (n = 157) of the growing season (September). Purified enzymes were used to measure N digestibility and to assess isotopic fractionation in response to nutrient digestibility during simulated digestion. Values for δ(13) C declined by 1.38 ‰ with increasing latitude across the transect, and increased by 0.44 ‰ from the beginning to the end of the season. The range of values for δ(15) N was greater than that for δ(13) C (13.29 vs 5.60 ‰). Differences in values for δ(13) C between graminoids (Eriophorum and Carex spp.) and shrubs (Betula and Salix spp.) were small but δ(15) N values distinguished graminoids (1.87 ± 1.02 ‰) from shrubs (-2.87 ± 2.93 ‰) consistently across season and latitude. However, undigested residues of forages were enriched in (15) N when the digestibility of N was less than 0.67. Although δ(15) N values can distinguish plant groups in the diet of arctic herbivores, variation in the digestibility of dietary items may need to be considered in applying fractionation values for (15) N to caribou and other herbivores that select highly digestible items (e.g. forbs) as well as heavily defended plants (e.g. woody browse). |
X Demographics
The data shown below were collected from the profiles of 8 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 3 | 38% |
| United Kingdom | 1 | 13% |
| Chile | 1 | 13% |
| Unknown | 3 | 38% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 6 | 75% |
| Scientists | 2 | 25% |
Mendeley readers
The data shown below were compiled from readership statistics for 19 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 19 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Master | 5 | 26% |
| Student > Ph. D. Student | 3 | 16% |
| Unspecified | 2 | 11% |
| Researcher | 2 | 11% |
| Student > Bachelor | 1 | 5% |
| Other | 2 | 11% |
| Unknown | 4 | 21% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 7 | 37% |
| Environmental Science | 4 | 21% |
| Unspecified | 2 | 11% |
| Medicine and Dentistry | 1 | 5% |
| Unknown | 5 | 26% |
Attention Score in Context
This research output has an Altmetric Attention Score of 4. 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 11 April 2017.
All research outputs
#6,848,601
of 22,958,253 outputs
Outputs from Rapid Communications in Mass Spectrometry
#924
of 4,759 outputs
Outputs of similar age
#108,782
of 308,958 outputs
Outputs of similar age from Rapid Communications in Mass Spectrometry
#9
of 50 outputs
Altmetric has tracked 22,958,253 research outputs across all sources so far. This one has received more attention than most of these and is in the 69th percentile.
So far Altmetric has tracked 4,759 research outputs from this source. They receive a mean Attention Score of 3.2. This one has done well, scoring higher than 80% 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 308,958 tracked outputs that were published within six weeks on either side of this one in any source. This one has gotten more attention than average, scoring higher than 64% of its contemporaries.
We're also able to compare this research output to 50 others from the same source and published within six weeks on either side of this one. This one has done well, scoring higher than 82% of its contemporaries.