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Beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space
Isotopic niche has typically been characterized through carbon and nitrogen ratios and most modeling approaches are limited to two dimensions. Yet, other stable isotopes can provide additional power to resolve questions associated with foraging, migration, dispersal and variations in resource use. T...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4834325/ https://www.ncbi.nlm.nih.gov/pubmed/27110351 http://dx.doi.org/10.1002/ece3.2013 |
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author | Rossman, Sam Ostrom, Peggy H. Gordon, Forrest Zipkin, Elise F. |
author_facet | Rossman, Sam Ostrom, Peggy H. Gordon, Forrest Zipkin, Elise F. |
author_sort | Rossman, Sam |
collection | PubMed |
description | Isotopic niche has typically been characterized through carbon and nitrogen ratios and most modeling approaches are limited to two dimensions. Yet, other stable isotopes can provide additional power to resolve questions associated with foraging, migration, dispersal and variations in resource use. The ellipse niche model was recently generalized to n‐dimensions. We present an analogous methodology which incorporates variation across three stable dimensions to estimate the significant features of a population's isotopic niche space including: 1) niche volume (referred to as standard ellipsoid volume, SEV), 2) relative centroid location (CL), 3) shape and 4) area of overlap between multiple ellipsoids and 5) distance between two CLs. We conducted a simulation study showing the accuracy and precision of three dimensional niche models across a range of values. Importantly, the model correctly identifies differences in SEV and CL among populations, even with small sample sizes and in cases where the absolute values cannot precisely be recovered. We use these results to provide guidelines for sample size in conducting multivariate isotopic niche modeling. We demonstrate the utility of our approach with a case study of three bottlenose dolphin populations which appear to possess largely overlapping niches when analyzed with only carbon and nitrogen isotopes. Upon inclusion of sulfur, we see that the three dolphin ecotypes are in fact segregated on the basis of salinity and find the stable isotope niche of inshore bottlenose dolphins significantly larger than coastal and offshore populations. |
format | Online Article Text |
id | pubmed-4834325 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-48343252016-04-22 Beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space Rossman, Sam Ostrom, Peggy H. Gordon, Forrest Zipkin, Elise F. Ecol Evol Original Research Isotopic niche has typically been characterized through carbon and nitrogen ratios and most modeling approaches are limited to two dimensions. Yet, other stable isotopes can provide additional power to resolve questions associated with foraging, migration, dispersal and variations in resource use. The ellipse niche model was recently generalized to n‐dimensions. We present an analogous methodology which incorporates variation across three stable dimensions to estimate the significant features of a population's isotopic niche space including: 1) niche volume (referred to as standard ellipsoid volume, SEV), 2) relative centroid location (CL), 3) shape and 4) area of overlap between multiple ellipsoids and 5) distance between two CLs. We conducted a simulation study showing the accuracy and precision of three dimensional niche models across a range of values. Importantly, the model correctly identifies differences in SEV and CL among populations, even with small sample sizes and in cases where the absolute values cannot precisely be recovered. We use these results to provide guidelines for sample size in conducting multivariate isotopic niche modeling. We demonstrate the utility of our approach with a case study of three bottlenose dolphin populations which appear to possess largely overlapping niches when analyzed with only carbon and nitrogen isotopes. Upon inclusion of sulfur, we see that the three dolphin ecotypes are in fact segregated on the basis of salinity and find the stable isotope niche of inshore bottlenose dolphins significantly larger than coastal and offshore populations. John Wiley and Sons Inc. 2016-03-09 /pmc/articles/PMC4834325/ /pubmed/27110351 http://dx.doi.org/10.1002/ece3.2013 Text en © 2016 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Research Rossman, Sam Ostrom, Peggy H. Gordon, Forrest Zipkin, Elise F. Beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space |
title | Beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space |
title_full | Beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space |
title_fullStr | Beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space |
title_full_unstemmed | Beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space |
title_short | Beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space |
title_sort | beyond carbon and nitrogen: guidelines for estimating three‐dimensional isotopic niche space |
topic | Original Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4834325/ https://www.ncbi.nlm.nih.gov/pubmed/27110351 http://dx.doi.org/10.1002/ece3.2013 |
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