Distance measures and optimization spaces in quantitative fatty acid signature analysis
Abstract Quantitative fatty acid signature analysis has become an important method of diet estimation in ecology, especially marine ecology. Controlled feeding trials to validate the method and estimate the calibration coefficients necessary to account for differential metabolism of individual fatty...
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crwiley:10.1002/ece3.1429 2024-09-15T18:02:00+00:00 Distance measures and optimization spaces in quantitative fatty acid signature analysis Bromaghin, Jeffrey F. Rode, Karyn D. Budge, Suzanne M. Thiemann, Gregory W. 2015 http://dx.doi.org/10.1002/ece3.1429 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.1429 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.1429 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.1429 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecology and Evolution volume 5, issue 6, page 1249-1262 ISSN 2045-7758 2045-7758 journal-article 2015 crwiley https://doi.org/10.1002/ece3.1429 2024-07-09T04:11:21Z Abstract Quantitative fatty acid signature analysis has become an important method of diet estimation in ecology, especially marine ecology. Controlled feeding trials to validate the method and estimate the calibration coefficients necessary to account for differential metabolism of individual fatty acids have been conducted with several species from diverse taxa. However, research into potential refinements of the estimation method has been limited. We compared the performance of the original method of estimating diet composition with that of five variants based on different combinations of distance measures and calibration‐coefficient transformations between prey and predator fatty acid signature spaces. Fatty acid signatures of pseudopredators were constructed using known diet mixtures of two prey data sets previously used to estimate the diets of polar bears U rsus maritimus and gray seals H alichoerus grypus , and their diets were then estimated using all six variants. In addition, previously published diets of Chukchi Sea polar bears were re‐estimated using all six methods. Our findings reveal that the selection of an estimation method can meaningfully influence estimates of diet composition. Among the pseudopredator results, which allowed evaluation of bias and precision, differences in estimator performance were rarely large, and no one estimator was universally preferred, although estimators based on the Aitchison distance measure tended to have modestly superior properties compared to estimators based on the K ullback– L eibler distance measure. However, greater differences were observed among estimated polar bear diets, most likely due to differential estimator sensitivity to assumption violations. Our results, particularly the polar bear example, suggest that additional research into estimator performance and model diagnostics is warranted. Article in Journal/Newspaper Chukchi Chukchi Sea Wiley Online Library Ecology and Evolution 5 6 1249 1262 |
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English |
description |
Abstract Quantitative fatty acid signature analysis has become an important method of diet estimation in ecology, especially marine ecology. Controlled feeding trials to validate the method and estimate the calibration coefficients necessary to account for differential metabolism of individual fatty acids have been conducted with several species from diverse taxa. However, research into potential refinements of the estimation method has been limited. We compared the performance of the original method of estimating diet composition with that of five variants based on different combinations of distance measures and calibration‐coefficient transformations between prey and predator fatty acid signature spaces. Fatty acid signatures of pseudopredators were constructed using known diet mixtures of two prey data sets previously used to estimate the diets of polar bears U rsus maritimus and gray seals H alichoerus grypus , and their diets were then estimated using all six variants. In addition, previously published diets of Chukchi Sea polar bears were re‐estimated using all six methods. Our findings reveal that the selection of an estimation method can meaningfully influence estimates of diet composition. Among the pseudopredator results, which allowed evaluation of bias and precision, differences in estimator performance were rarely large, and no one estimator was universally preferred, although estimators based on the Aitchison distance measure tended to have modestly superior properties compared to estimators based on the K ullback– L eibler distance measure. However, greater differences were observed among estimated polar bear diets, most likely due to differential estimator sensitivity to assumption violations. Our results, particularly the polar bear example, suggest that additional research into estimator performance and model diagnostics is warranted. |
format |
Article in Journal/Newspaper |
author |
Bromaghin, Jeffrey F. Rode, Karyn D. Budge, Suzanne M. Thiemann, Gregory W. |
spellingShingle |
Bromaghin, Jeffrey F. Rode, Karyn D. Budge, Suzanne M. Thiemann, Gregory W. Distance measures and optimization spaces in quantitative fatty acid signature analysis |
author_facet |
Bromaghin, Jeffrey F. Rode, Karyn D. Budge, Suzanne M. Thiemann, Gregory W. |
author_sort |
Bromaghin, Jeffrey F. |
title |
Distance measures and optimization spaces in quantitative fatty acid signature analysis |
title_short |
Distance measures and optimization spaces in quantitative fatty acid signature analysis |
title_full |
Distance measures and optimization spaces in quantitative fatty acid signature analysis |
title_fullStr |
Distance measures and optimization spaces in quantitative fatty acid signature analysis |
title_full_unstemmed |
Distance measures and optimization spaces in quantitative fatty acid signature analysis |
title_sort |
distance measures and optimization spaces in quantitative fatty acid signature analysis |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1002/ece3.1429 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fece3.1429 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.1429 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.1429 |
genre |
Chukchi Chukchi Sea |
genre_facet |
Chukchi Chukchi Sea |
op_source |
Ecology and Evolution volume 5, issue 6, page 1249-1262 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ece3.1429 |
container_title |
Ecology and Evolution |
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5 |
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6 |
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1249 |
op_container_end_page |
1262 |
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1810439066150240256 |