Ontogenetic diet changes in bottlenose dolphins (Tursiops truncatus) reflected through stable isotopes

By Amanda J. Knoff, Aleta A Hohn, S. Macko. 2008

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Foraging ecology of five toothed whale species in the Northwest Iberian Peninsula, inferred using carbon and nitrogen isotope ratios (2012, background): “Ratios of the natural abundance of stable isotopes of carbon (δ13C) and nitrogen (δ15N) have been extensively used in studies of cetacean ecology to assess dietary variation in space and time (Abend and Smith, 1995; Knoff et al., 2008; Mendes et al., 2007).”
Stable isotope analysis in two sympatric populations of bottlenose dolphins Tursiops truncatus: evidence of resource partitioning? (2011, background): “…1981), ratios of the natural abundance of stable isotopes of carbon (13C/12C) and nitrogen (15N/14N) have been used extensively in studies of cetacean ecology to assess dietary variation in space and time (e.g., Abend and Smith 1995; Mendes et al. 2007; de Stephanis et al. 2008; Knoff et al. 2008).”
Using stable isotope biogeochemistry to study marine mammal ecology (2010, background): “Growth layer thickness does decrease with age such that it may be impossible to sample individual annuli deposited during the adult life stage, and material from several annuli may have to be combined to produce enough material for SIA (Niño-Torres et al. 2006, Knoff et al. 2008).”