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Differentiation of Neotropical Fish Species with Statistical Analysis of Fourier Transform Infrared Photoacoustic Spectroscopy Data

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Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) was applied to nineteen fish species in Brazil's Upper Paraná River basin to identify differences in the structural composition of their scales. To differentiate the species, a canonical discriminant analysis was used to indicate the most important absorption peaks in the mid-infrared region. Significant differences were found in the chemical composition of scales among the studied fish species, with Wilk's lambda = 5.2 × 10−6, F (13,18,394) = 37.57, and P < 0.001, indicating that O‐CH2 wag at 1396 cm−1 can be used as a biomarker of this species group. The species could be categorized into four groups according to phylogenetic similarity, suggesting that the O‐CH2 1396 cm−1 absorbance is related to the biological traits of each species. This procedure can also be used to complement evolutionary studies.

Keywords: Canonical discriminant analysis; FT-IR-PAS; Fourier transform infrared photoacoustic spectroscopy; Neotropical fish biomarker

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/11-06487

Affiliations: Grupo de Espectroscopia Óptica e Fototérmica, Programa de Pós-Graduação em Recursos Naturais, Universidade Estadual de Mato Grosso do Sul, C.P. 351, Dourados, MS, Brazil

Publication date: July 1, 2012

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