Potential biases in dietary interpretation derived from stable isotope analysis of small dolphin teeth.

Autor: Troina GC; Laboratório de Ecologia e Conservação da Megafauna Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Av. Itália, km 8, Rio Grande, RS, 96203-900, Brazil; Analytical, Environmental and Geo-Chemistry Department (AMGC), Vrije Universiteit Brussel (VUB), B-1050, Brussels, Belgium; Institute for the Oceans and Fisheries, University of British Columbia (UBC), V6T 1Z4, Vancouver, BC, Canada. Electronic address: g.troina@oceans.ubc.ca., Teixeira CR; Whale Habitat, Ecology and Telemetry Laboratory, Marine Mammal Institute, Oregon State University, Newport, OR, USA., Dehairs F; Analytical, Environmental and Geo-Chemistry Department (AMGC), Vrije Universiteit Brussel (VUB), B-1050, Brussels, Belgium., Secchi ER; Laboratório de Ecologia e Conservação da Megafauna Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Av. Itália, km 8, Rio Grande, RS, 96203-900, Brazil., Botta S; Laboratório de Ecologia e Conservação da Megafauna Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Av. Itália, km 8, Rio Grande, RS, 96203-900, Brazil.
Jazyk: angličtina
Zdroj: Marine environmental research [Mar Environ Res] 2023 Feb; Vol. 184, pp. 105857. Date of Electronic Publication: 2022 Dec 22.
DOI: 10.1016/j.marenvres.2022.105857
Abstrakt: We analyzed δ 13 C and δ 15 N values in different tooth portions (Growth Layer Groups, GLGs) of franciscanas, Pontoporia blainvillei, to investigate their effect on whole tooth (WT) isotopic values and the implications for dietary estimates. Tooth portions included the dentin deposited during the prenatal development (PND), the first year of life (GLG 1 ) deposited during the nursing period and the central part of the tooth with no distinction amongst subsequent GLGs (Center). Isotopic mixing models estimating the contribution of PND, GLG 1 and Center to WT showed that GLG 1 has a strong effect on WT isotope values in juveniles, while Center only starts to affect WT isotopic values from age four. Isotopic mixing models estimating prey contribution to the diet of juveniles using WT vs Center tooth portions significantly differed in dietary outputs, demonstrating that GLG 1 influence on WT isotope values affects dietary estimates in young franciscanas. As the small tooth size and narrowness of the last GLGs hinder the analysis of individual layers, we recommend excluding GLG 1 in studies based on teeth isotope composition in franciscanas and caution when interpreting isotopic values from the WT of other small cetaceans.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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