Variation in δ 15 N and δ 13 C values of forages for Arctic caribou: effects of location, phenology and simulated digestion
Rationale 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...
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crwiley:10.1002/rcm.7849 2024-06-02T08:01:29+00:00 Variation in δ 15 N and δ 13 C values of forages for Arctic caribou: effects of location, phenology and simulated digestion Vansomeren, Lindsay L. Barboza, Perry S. Gustine, David D. Syndonia Bret‐Harte, M. U.S. Geological Survey 2017 http://dx.doi.org/10.1002/rcm.7849 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frcm.7849 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rcm.7849 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rcm.7849 https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/am-pdf/10.1002/rcm.7849 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Rapid Communications in Mass Spectrometry volume 31, issue 9, page 813-820 ISSN 0951-4198 1097-0231 journal-article 2017 crwiley https://doi.org/10.1002/rcm.7849 2024-05-03T12:01:08Z Rationale 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 ). Methods 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. Results 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. Conclusions 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). Published in 2017. This article is a U.S. Government work and is in the public domain in the ... Article in Journal/Newspaper Arctic caribou Eriophorum north slope Rangifer tarandus Alaska Wiley Online Library Arctic Rapid Communications in Mass Spectrometry 31 9 813 820 |
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Wiley Online Library |
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language |
English |
description |
Rationale 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 ). Methods 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. Results 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. Conclusions 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). Published in 2017. This article is a U.S. Government work and is in the public domain in the ... |
author2 |
U.S. Geological Survey |
format |
Article in Journal/Newspaper |
author |
Vansomeren, Lindsay L. Barboza, Perry S. Gustine, David D. Syndonia Bret‐Harte, M. |
spellingShingle |
Vansomeren, Lindsay L. Barboza, Perry S. Gustine, David D. Syndonia Bret‐Harte, M. Variation in δ 15 N and δ 13 C values of forages for Arctic caribou: effects of location, phenology and simulated digestion |
author_facet |
Vansomeren, Lindsay L. Barboza, Perry S. Gustine, David D. Syndonia Bret‐Harte, M. |
author_sort |
Vansomeren, Lindsay L. |
title |
Variation in δ 15 N and δ 13 C values of forages for Arctic caribou: effects of location, phenology and simulated digestion |
title_short |
Variation in δ 15 N and δ 13 C values of forages for Arctic caribou: effects of location, phenology and simulated digestion |
title_full |
Variation in δ 15 N and δ 13 C values of forages for Arctic caribou: effects of location, phenology and simulated digestion |
title_fullStr |
Variation in δ 15 N and δ 13 C values of forages for Arctic caribou: effects of location, phenology and simulated digestion |
title_full_unstemmed |
Variation in δ 15 N and δ 13 C values of forages for Arctic caribou: effects of location, phenology and simulated digestion |
title_sort |
variation in δ 15 n and δ 13 c values of forages for arctic caribou: effects of location, phenology and simulated digestion |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/rcm.7849 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Frcm.7849 https://onlinelibrary.wiley.com/doi/pdf/10.1002/rcm.7849 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rcm.7849 https://analyticalsciencejournals.onlinelibrary.wiley.com/doi/am-pdf/10.1002/rcm.7849 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic caribou Eriophorum north slope Rangifer tarandus Alaska |
genre_facet |
Arctic caribou Eriophorum north slope Rangifer tarandus Alaska |
op_source |
Rapid Communications in Mass Spectrometry volume 31, issue 9, page 813-820 ISSN 0951-4198 1097-0231 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/rcm.7849 |
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Rapid Communications in Mass Spectrometry |
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31 |
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9 |
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