Discrimination factors and incorporation rates for organic matrix in shark teeth based on a captive feeding study
Fecha
2017Autor
Zeichner, S. S.
Colman, A. S.
Koch, P. L.
Polo-Silva, C.
Galván-Magaña, F.
Kim, S. L.
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Resumen
Sharks migrate annually over large distances and occupy a wide
variety of habitats, complicating analysis of lifestyle and diet. A
biogeochemical technique often used to reconstruct shark diet
and environment preferences is stable isotope analysis, which is
minimally invasive and integrates through time and space. There
are previous studies that focus on isotopic analysis of shark soft
tissues, but there are limited applications to shark teeth. However,
shark teeth offer an advantage of multiple ecological snapshots
and minimum invasiveness during removal because of their
distinct conveyor belt tooth replacement system. In this study,
we analyze d13C and d15N values of the organic matrix in leopard
shark teeth (Triakis semifasciata) from a captive experiment and
report discrimination factors as well as incorporation rates. We
found differences in tooth discrimination factors for individuals
fed different prey sources (mean 5 SD; D13Csquid p 4.7‰ 5
0.5‰, D13Ctilapia p 3.1‰ 5 1.0‰, D15Nsquid p 2.0‰ 5 0.7‰,
D15Ntilapia p 2.8‰ 5 0.6‰). In addition, these values differed
from previously published discrimination factors for plasma, red
blood cells, and muscle of the same leopard sharks. Incorporation
rates of shark teeth were similar for carbon and nitrogen
(mean 5 SE; lC p 0.021 5 0.009, lN p 0.024 5 0.007) and
comparable to those of plasma. We emphasize the difference in
biological parameters on the basis of tissue substrate and diet
items to interpret stable isotope data and apply our results to
stable isotope values from blue shark (Prionace glauca) teeth to
illustrate the importance of biological parameters to interpret the
complex ecology of a migratory shark.
Palabras clave
Leopard shark; Controlled feeding study; Stable isotope analysis; Carbon; Nitrogen; Blue sharkEnlace al recurso
https://www.journals.uchicago.edu/doi/abs/10.1086/689192Colecciones
- Año 2017 [150]
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