Trophic inferences of blue shark (Prionace glauca) in the Mexican Pacific from stable isotope analysis in teeth.
Rapid Commun Mass Spectrom
; 26(14): 1631-8, 2012 Jul 30.
Article
em En
| MEDLINE
| ID: mdl-22693119
ABSTRACT
RATIONALE Isotopic analysis of biogenic tissues such as teeth of elasmobranchs has been well recognized as an important method to interpret present and past environmental conditions. However, few studies on shark teeth have focused their attention on making trophic inferences or reconstruction of diet. METHODS:
We analyzed the carbon (δ(13)C) and nitrogen (δ(15)N) isotope composition of the tooth crown and root from blue sharks Prionace glauca caught in southern Baja California using a continuous-flow system by means of an elemental analyzer combined with a Delta Plus XL mass spectrometer, to describe their feeding ecology, considering sex and maturity stage.RESULTS:
Significant differences in δ(13)C values for tooth root were found between immature and mature males, with depleted values of (13)C in immature individuals. No statistical differences were found between maturity stages in females for both the C and N isotopes in any part of the tooth, which suggests that females were consuming the same prey in the same area. In addition, we observed significant differences in δ(15)N values between the tooth crown and root.CONCLUSIONS:
Isotopic analysis in the tooth crown (dentin) and root may represent a new tool to describe the feeding ecology of different species of elasmobranchs, showing dietary change over a short timescale.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tubarões
/
Dente
/
Isótopos de Carbono
/
Cadeia Alimentar
/
Isótopos de Nitrogênio
Limite:
Animals
País/Região como assunto:
Mexico
Idioma:
En
Revista:
Rapid Commun Mass Spectrom
Ano de publicação:
2012
Tipo de documento:
Article