Isotopic trophic discrimination factors (Δ13C, Δ15N) and their determinants in a subtropical macroinvertebrate food chain

• DOI: 10.23818/limn.44.14
• Publication Date: 2024-09-25T15:55:35Z
• Authors: Ivana Silva; Daniel E. Naya; Ernesto Brugnoli; Alejandro D'Anatro; Franco Teixeira d...; Iván González-Ber...
• Keywords: δ15N; Chain (unit)

The accurate estimation of trophic discrimination factors (TDFs) for stable carbon and nitrogen isotopes (Δ13C Δ15N) requires studies each particular species or taxonomic group, because the use general TDFs values all animals obtained from literature represents an important bias in isotopic modelling. Values Δ13C Δ15N were estimated aquatic food chain (periphyton-Chironomini-Perithemis sp.), a subtropical region South America, under experimental conditions using two approaches: i) Traditional arithmetic equation ii) Bayesian inference mixing models. effect diet quality on TDF variability was also evaluated. We report Chironomini when feeding periphyton (1.12 ± 1.31‰ 0.92 1.94‰ C N, respectively equation) Perithemis sp. (0.65 1.52‰ 0.90 1.08‰ respectively, according to equation). similar results inference. did not find effects values; although we highlighted that, unexpectedly, composition strongly affected N. These reported improve accuracy modeling macroinvertebrates future web research.