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Integrating ontogenetic shift, growth and mortality to determine a species' ecological role from isotopic signatures.

Fontoura NF, Rodrigues LR, Batista CB, Persch TS, Janowicz ME - PLoS ONE (2015)

Bottom Line: Stable isotopes provide information on the trophic level of species, food-web length, and origin of organic matter ingested by consumers.In this study, we analyzed the ontogenetic variability of δ13C and δ15N obtained from samples of three Neotropical fish species: silver sardine (Lycengraulis grossidens, n=46), white lambari (Cyanocharax alburnus, n= 26), and the red-tail lambari (Astyanax fasciatus, n=23) in Pinguela Lagoon, southern Brazil.We developed a new metric, called the Weighted Isotopic Signature (φ 15N or φ 13C, ‰), that incorporates ontogenetic variability, body growth, and natural mortality into a single number.

View Article: PubMed Central - PubMed

Affiliation: Faculdade de Biociências; Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.

ABSTRACT
Understanding species linkages and energy transfer is a basic goal underlying any attempt at ecosystem analysis. Although the first food-web studies were based on gut contents of captured specimens, the assessment of stable isotopes, mainly δ13C and δ15N, has become a standard methodology for wide-range analyses in the last 30 years. Stable isotopes provide information on the trophic level of species, food-web length, and origin of organic matter ingested by consumers. In this study, we analyzed the ontogenetic variability of δ13C and δ15N obtained from samples of three Neotropical fish species: silver sardine (Lycengraulis grossidens, n=46), white lambari (Cyanocharax alburnus, n= 26), and the red-tail lambari (Astyanax fasciatus, n=23) in Pinguela Lagoon, southern Brazil. We developed a new metric, called the Weighted Isotopic Signature (φ 15N or φ 13C, ‰), that incorporates ontogenetic variability, body growth, and natural mortality into a single number.

No MeSH data available.


Estimates of the Weighted Isotopic Signature (φ15N or φ13C, ‰) for Lycengraulis grossidens and Astyanax fasciatus at different mortality rates, keeping the growth parameters constant.
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pone.0125059.g003: Estimates of the Weighted Isotopic Signature (φ15N or φ13C, ‰) for Lycengraulis grossidens and Astyanax fasciatus at different mortality rates, keeping the growth parameters constant.

Mentions: These differences will increase depending on mortality rates. If growth parameters are kept constant, φ15N and φ13C values are closer to juvenile values if mortality rates are high, whereas these values increase more closely to the adult profile as mortality rates decrease (Fig 3).


Integrating ontogenetic shift, growth and mortality to determine a species' ecological role from isotopic signatures.

Fontoura NF, Rodrigues LR, Batista CB, Persch TS, Janowicz ME - PLoS ONE (2015)

Estimates of the Weighted Isotopic Signature (φ15N or φ13C, ‰) for Lycengraulis grossidens and Astyanax fasciatus at different mortality rates, keeping the growth parameters constant.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4440762&req=5

pone.0125059.g003: Estimates of the Weighted Isotopic Signature (φ15N or φ13C, ‰) for Lycengraulis grossidens and Astyanax fasciatus at different mortality rates, keeping the growth parameters constant.
Mentions: These differences will increase depending on mortality rates. If growth parameters are kept constant, φ15N and φ13C values are closer to juvenile values if mortality rates are high, whereas these values increase more closely to the adult profile as mortality rates decrease (Fig 3).

Bottom Line: Stable isotopes provide information on the trophic level of species, food-web length, and origin of organic matter ingested by consumers.In this study, we analyzed the ontogenetic variability of δ13C and δ15N obtained from samples of three Neotropical fish species: silver sardine (Lycengraulis grossidens, n=46), white lambari (Cyanocharax alburnus, n= 26), and the red-tail lambari (Astyanax fasciatus, n=23) in Pinguela Lagoon, southern Brazil.We developed a new metric, called the Weighted Isotopic Signature (φ 15N or φ 13C, ‰), that incorporates ontogenetic variability, body growth, and natural mortality into a single number.

View Article: PubMed Central - PubMed

Affiliation: Faculdade de Biociências; Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.

ABSTRACT
Understanding species linkages and energy transfer is a basic goal underlying any attempt at ecosystem analysis. Although the first food-web studies were based on gut contents of captured specimens, the assessment of stable isotopes, mainly δ13C and δ15N, has become a standard methodology for wide-range analyses in the last 30 years. Stable isotopes provide information on the trophic level of species, food-web length, and origin of organic matter ingested by consumers. In this study, we analyzed the ontogenetic variability of δ13C and δ15N obtained from samples of three Neotropical fish species: silver sardine (Lycengraulis grossidens, n=46), white lambari (Cyanocharax alburnus, n= 26), and the red-tail lambari (Astyanax fasciatus, n=23) in Pinguela Lagoon, southern Brazil. We developed a new metric, called the Weighted Isotopic Signature (φ 15N or φ 13C, ‰), that incorporates ontogenetic variability, body growth, and natural mortality into a single number.

No MeSH data available.