[MARMAM] PAPER: Variation in δ15N and δ13C stable isotope values in common dolphins (Delphinus spp.) worldwide, with particular emphasis on the eastern North Atlantic populations.

Ana Pinela ana_pinela at hotmail.com
Mon Apr 20 16:51:32 PDT 2015

To whom it may concern:

The following paper has been recently published in Rapid Communications in Mass Spectrometry:

'Variation in δ15N and δ13C stable isotope values
in common dolphins (Delphinus spp.)
worldwide, with particular emphasis on the eastern North Atlantic populations.' 
AM Pinela, Borrell A & Aguilar A (2015) 

Article first published online: 25 MAR 2015
DOI: 10.1002/rcm.7173

RATIONALE Distinguishing population units of
small cetaceans continuously distributed in a widespread area is challenging
but critical for their conservation and management. The use of chemical markers
allows investigating foraging ecology and inter-specific variability, in order
to detect population structure and niche segregation in the common dolphin (Delphinus spp.).METHODS Stable isotopes of carbon (δ13C)
and nitrogen (δ15N) were measured in the bone tissue of common
dolphins accidentally by-caught or stranded along the North-eastern and eastern Subtropical Atlantic Ocean, by means
of continuous flow
isotope ratio mass spectrometry. Trophic positions were determined and
compared, taking into account the local ecosystem trophic baseline for each
study area. Data obtained for the study areas were qualitatively compared to
common dolphin species/populations distributed worldwide.RESULTS δ13C and δ15N values were higher in the
eastern Subtropical Atlantic as
a consequence of the coexistence in the area of the common dolphin short- and
long-beaked morphotypes. Individuals from the North-eastern Atlantic displayed
lower δ15N values, reflecting dissimilarities in diet and of
variation in local isotopic baselines. Comparisons with other areas around the world, suggest the species is
extremely adaptive and feeds
at different trophic levels to adapt to local variations. 

 CONCLUSIONS Stable isotopes are a useful tool
to investigate population structure and trophic niche segregation. Trophic
behaviour of worldwide populations of common dolphins were fruitfully analysed
and revealed substantial differences, likely reflective of both adaptive
strategies of the genus and dissimilarities in the structure of the ecosystems.

Here is the link to the Abstract page: 
If you are interested in a PDF *reprint* please write to this e-mail address:
ana.pinela at gmail.com
Thank you very much in advance.
Best regards,Ana M. Pinela(University of Barcelona)

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