[MARMAM] New paper on Trophic Relationships and Habitat Preferences of Delphinids

Tatiana Bisi tbisi at yahoo.com.br
Thu Dec 19 12:18:19 PST 2013

Dear Colleagues,
The following article has recently been 
Bisi TL, Dorneles PR, Lailson-Brito J, Lepoint 
G, Azevedo AF, Flach L, Malm O, Das K. (2013) Trophic Relationships and 
Habitat Preferences of Delphinids from the Southeastern Brazilian Coast 
Determined by Carbon and Nitrogen Stable Isotope Composition. PLoS ONE 
8(12): e82205. doi:10.1371/journal.pone.0082205
To investigate the foraging habitats of delphinids in 
southeastern Brazil, we analyzed stable carbon (d13C) and nitrogen(d15N) isotopes in muscle samples of the 
following 10 delphinid species: Sotalia guianensis, Stenella 
frontalis, Tursiopstruncatus, Steno bredanensis, Pseudorca 
crassidens, Delphinus sp., Lagenodelphis hosei, Stenella attenuata, Stenella longirostris and Grampus griseus. We also 
compared the d13C and d15N values among four populations of S. 
guianensis. Variation incarbon 
isotope results from coast to ocean indicated that there was a significant 
decrease in d13C values from estuarinedolphins to oceanic species. S. guianensis from Guanabara 
Bay had the highest mean d13C value, while oceanic speciesshowed significantly lower d13C values. 
The highest d15N values were observed for P. crassidens and T. 
truncatus, suggestingthat 
these species occupy the highest trophic position among the delphinids studied 
here. The oceanic species S. attenuata,G. griseus and L. hosei had the lowest d15N 
values. Stable isotope analysis showed that the three populations of S. 
guianensis in coastal bays had 
different d13C values, but similar d15N results. Guiana dolphins from Sepetiba 
and Ilha Grande bays haddifferent 
foraging habitat, with specimens from Ilha Grande showing more negative d13C 
values. This study provides furtherinformation on the feeding ecology of delphinids occurring in 
southeastern Brazil, with evidence of distinctive foraginghabitats and the occupation of different 
ecological niches by these species in the study area.
Full text is freely 
available at: http://dx.plos.org/10.1371/journal.pone.0082205

For further inquiries, please feel free to contact me at tbisi at yahoo.com.br

Best regards,
Dra. Tatiana Lemos 
Laboratório de Mamíferos Aquáticos e Bioindicadores “Profa. Izabel 
Gurgel” (MAQUA)
Faculdade de Oceanografia
Universidade do Estado do Rio 
de Janeiro
Rua São Francisco Xavier, 524 sala 4002, bloco E, 4o 
Maracanã, Rio de Janeiro - RJ CEP 20.550-013
Tel: +55 21-2334-0065 / 
email: tbisi at yahoo.com.br
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