Isotopic diversity indices: how sensitive to food web structure?

Recently revisited, the concept of niche ecology has lead to the formalisation of functional and trophic niches using stable isotope ratios. Isotopic diversity indices (IDI) derived from a set of measures assessing the dispersion/distribution of points in the δ-space were recently suggested and incr...

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Autores principales:	Anik Brind'Amour, Stanislas F Dubois
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/83044747fbf24b468c9c85964a5af0bb
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id	oai:doaj.org-article:83044747fbf24b468c9c85964a5af0bb
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spelling	oai:doaj.org-article:83044747fbf24b468c9c85964a5af0bb2021-11-18T08:39:23ZIsotopic diversity indices: how sensitive to food web structure?1932-620310.1371/journal.pone.0084198https://doaj.org/article/83044747fbf24b468c9c85964a5af0bb2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24391910/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Recently revisited, the concept of niche ecology has lead to the formalisation of functional and trophic niches using stable isotope ratios. Isotopic diversity indices (IDI) derived from a set of measures assessing the dispersion/distribution of points in the δ-space were recently suggested and increasingly used in the literature. However, three main critics emerge from the use of these IDI: 1) they fail to account for the isotopic sources overlap, 2) some indices are highly sensitive to the number of species and/or the presence of rare species, and 3) the lack of standardization prevents any spatial and temporal comparisons. Using simulations we investigated the ability of six commonly used IDI to discriminate among different trophic food web structures, with a focus on the first two critics. We tested the sensitivity of the IDI to five food web structures along a gradient of sources overlap, varying from two distinct food chains with differentiated sources to two superimposed food chains sharing two sources. For each of the food web structure we varied the number of species (from 10 to 100 species) and the type of species feeding behaviour (i.e. random or selective feeding). Values of IDI were generally larger in food webs with distinct basal sources and tended to decrease as the superimposition of the food chains increased. This was more pronounced when species displayed food preferences in comparison to food webs where species fed randomly on any prey. The number of species composing the food web also had strong effects on the metrics, including those that were supposedly less sensitive to small sample size. In all cases, computing IDI on food webs with low numbers of species always increases the uncertainty of the metrics. A threshold of ~20 species was detected above which several metrics can be safely used.Anik Brind'AmourStanislas F DuboisPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 12, p e84198 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Anik Brind'Amour Stanislas F Dubois Isotopic diversity indices: how sensitive to food web structure?
description	Recently revisited, the concept of niche ecology has lead to the formalisation of functional and trophic niches using stable isotope ratios. Isotopic diversity indices (IDI) derived from a set of measures assessing the dispersion/distribution of points in the δ-space were recently suggested and increasingly used in the literature. However, three main critics emerge from the use of these IDI: 1) they fail to account for the isotopic sources overlap, 2) some indices are highly sensitive to the number of species and/or the presence of rare species, and 3) the lack of standardization prevents any spatial and temporal comparisons. Using simulations we investigated the ability of six commonly used IDI to discriminate among different trophic food web structures, with a focus on the first two critics. We tested the sensitivity of the IDI to five food web structures along a gradient of sources overlap, varying from two distinct food chains with differentiated sources to two superimposed food chains sharing two sources. For each of the food web structure we varied the number of species (from 10 to 100 species) and the type of species feeding behaviour (i.e. random or selective feeding). Values of IDI were generally larger in food webs with distinct basal sources and tended to decrease as the superimposition of the food chains increased. This was more pronounced when species displayed food preferences in comparison to food webs where species fed randomly on any prey. The number of species composing the food web also had strong effects on the metrics, including those that were supposedly less sensitive to small sample size. In all cases, computing IDI on food webs with low numbers of species always increases the uncertainty of the metrics. A threshold of ~20 species was detected above which several metrics can be safely used.
format	article
author	Anik Brind'Amour Stanislas F Dubois
author_facet	Anik Brind'Amour Stanislas F Dubois
author_sort	Anik Brind'Amour
title	Isotopic diversity indices: how sensitive to food web structure?
title_short	Isotopic diversity indices: how sensitive to food web structure?
title_full	Isotopic diversity indices: how sensitive to food web structure?
title_fullStr	Isotopic diversity indices: how sensitive to food web structure?
title_full_unstemmed	Isotopic diversity indices: how sensitive to food web structure?
title_sort	isotopic diversity indices: how sensitive to food web structure?
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/83044747fbf24b468c9c85964a5af0bb
work_keys_str_mv	AT anikbrindamour isotopicdiversityindiceshowsensitivetofoodwebstructure AT stanislasfdubois isotopicdiversityindiceshowsensitivetofoodwebstructure
_version_	1718421511065305088

Isotopic diversity indices: how sensitive to food web structure?

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