2021
DOI: 10.1017/s0025315421000217
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Trophic ecology and foraging areas of cetaceans sampled in the coastal waters of south-eastern Brazil assessed through skinδ13C andδ15N

Abstract: We investigated the habitat use and feeding ecology of 10 cetacean species encountered along the south-eastern coast of Brazil (24–26°S) using carbon (δ13C) and nitrogen (δ15N) stable isotopes. Hierarchical cluster analysis distinguished two main groups based on their isotopic patterns. One group included migratory baleen whales (Megaptera novaeangliae and Eubalaena australis) with the lowest δ13C and δ15N values, reflecting baseline isotopic values of their Subantarctic feeding grounds and consumption of lowe… Show more

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Cited by 8 publications
(3 citation statements)
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“…Because the δ 13 C values are related to the primary source of carbon in the food web, from this result, one can primarily infer that franciscana dolphins from these two regions feed on different carbon sources, i.e., there may be a difference in the use of the area by the species from both subareas. Studies have previously investigated δ 13 C values in cetaceans in other regions of Brazil to ascertain the existence of distinct ecological groups (Bisi et al, 2013; Hardt et al, 2013; Paschoalini et al, 2021). Bisi et al (2013) differentiated four populations of Guiana dolphin on the coast of Rio de Janeiro from the distinct δ 13 C values between the regions.…”
Section: Discussionmentioning
confidence: 99%
“…Because the δ 13 C values are related to the primary source of carbon in the food web, from this result, one can primarily infer that franciscana dolphins from these two regions feed on different carbon sources, i.e., there may be a difference in the use of the area by the species from both subareas. Studies have previously investigated δ 13 C values in cetaceans in other regions of Brazil to ascertain the existence of distinct ecological groups (Bisi et al, 2013; Hardt et al, 2013; Paschoalini et al, 2021). Bisi et al (2013) differentiated four populations of Guiana dolphin on the coast of Rio de Janeiro from the distinct δ 13 C values between the regions.…”
Section: Discussionmentioning
confidence: 99%
“…The high THg levels likely reflect the rough-toothed dolphins high-trophic prey preferences, which appear to be indicated by the isotopic values enriched in δ 15 N that have been reported in dolphins' skin here and in other areas worldwide (SMT3). Examples include the southern Rio de Janeiro State in Brazil (δ 15 N-mean = 14.5; SD = 0.1 ‰; n = 3; δ 15 Nmean-autumn = 18.1; SD = 0.5 ‰; N = 4; δ 15 Nmean = 18.6; SD = 0.2 ‰; n = 5; Paschoalini et al, 2021;Troina et al, 2020Troina et al, , 2021, La Guajira in the Colombian Caribbean (δ 15 N-mean = 12.8; SD = 0.1 ‰; n = 3; Barragán-Barrera, Farías-Curtidor, Chávez-Carreño et al, 2019), and Moorea Island in the Society Archipelago (δ 15 N-mean = ~ 14.7 ‰; N = 35; Kiszka et al, 2010). The rough-toothed dolphin diet consists of cephalopods and fish of various sizes, including large and carnivorous fish with high trophic levels like black skipjack (Euthynnus lineatus Kishinouye, 1920), mahimahi (Coryphaena hippurus Linnaeus, 1758), and ribbonfish (Trichiurus lepturus Linnaeus, 1758) (Ortega-Ortiz et al, 2014;Pitman & Stinchcomb, 2002;West et al, 2011).…”
Section: Introductionmentioning
confidence: 99%
“…Cetaceans' skin is considered a multidimensional feature that can provide a wealth of information, forming the basis of research in a wide number of studies covering a broad range of scientific branches [1][2][3][4][5][6][7][8]. Hence, this tissue has been used for long-term health assessments, enabling us to gain a closer look at the health status of marine mammals and aquatic ecosystems [9][10][11][12].…”
Section: Introductionmentioning
confidence: 99%