Genyffer Troina

University of British Columbia | UBC · Institute for the Oceans and Fisheries

We analyzed δ13C and δ15N 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 (GLG1...

Trophic ecology information about cetaceans is essential to understand their role in ecosystem dynamics. Stable isotope analysis is a valuable complementary approach to conventional methods usually applied to the study of the foraging behavior of cetaceans because it provides dietary information over different time scales and can potentially use ti...

We conducted a meta-analysis of the franciscana (Pontoporia blainvillei ) diet based on published data on stomach contents and stable isotopes, from 1867 to 2021. We provide an assessment of the spatial and temporal variation in the occurrence of franciscana prey throughout its distributional range. Pelagic prey was more frequent in the diet of fra...

We investigated the trophic structure and habitat use of ten cetacean species occurring in the oceanic waters of the western South Atlantic using naturally-occurring stable isotopes. We analysed δ15N in individual amino acids (AA) to estimate cetacean trophic position (TP) and to evaluate the spatial differences in baseline δ15N (source AAs). We ad...

The authors apologise that the listing of the author Marcos César de Oliveira Santos’ name, both as author of the paper and within the reference list and subsequent citations in the paper, was incorrectly presented. As author of the paper, the author’s surname was listed as ‘De Oliveira Santos, MC’, and within the citations and references as ‘de Sa...

In order to assess trophic ecology and feeding areas of free-ranging odontocetes sampled in the oceanic waters of the Southwestern Atlantic Ocean we measured the bulk carbon (δ13C), bulk nitrogen (δ15N) and compound specific amino acid (AA) nitrogen isotopic composition of their skin. AA-δ15N data were applied to estimate cetacean trophic position...

We analyzed skin of free-ranging odontocetes sampled in the oceanic waters of the Southwestern Atlantic Ocean. Stable isotopes of carbon (δ13C) and nitrogen (δ15N) were measured in bulk-skin and δ15N was analyzed in individual amino acids (AA). AA-δ15N data were applied to estimate cetacean trophic position (TP) and to evaluate the spatial differen...

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 novaeang...

Dolphins are highly social animals usually reported in large groups comprised of individuals of a single species, although they are often reported associating with other species as well. The drivers for the formation of these mixed-species associations (MSAs) are poorly understood, and records in Brazilian waters are scarce. To better understand th...

Large diversity and abundance of cetacean species occur along the Brazilian outer continental shelf and slope waters. In the present study, we analyzed carbon (δ13C) and nitrogen (δ15N) stable isotopes in skin biopsies of ten odontocete species (Delphinidae and Physeteridae) to assess the intra- and inter-specific patterns in the use of resources a...

Great white pelicans (Pelecanus onocrotalus) exhibit life-history parameters and ecological traits thought to be associated with social learning, and advanced cognitive processing more generally. In this study we investigated whether this species can acquire novel behavior socially in a foraging context. Birds from the test group watched a trained...

Characterizing the patterns of stable carbon (δ13C) and nitrogen (δ15N) isotopes at the base of the food webs (baseline) is essential in ecological studies for assessing the feeding habits and migration patterns of marine predators. We analysed δ13C and δ15N in zooplankton samples collected in spring and autumn (2012-2015), along the south (SCM) an...

We assessed the feeding habits of franciscanas (Pontoporia blainvillei) from southern Brazil through carbon and nitrogen stable isotopes measured in the tooth dentin of dolphins from different age classes. Generalized additive models were fitted to assess whether sex, age, and total body length explained changes in franciscanas isotope ratios. Baye...