[MARMAM] New publication: Isotopic evidence of limited exchange between Mediterranean and eastern North Atlantic fin whales.

Joan Giménez Verdugo joan.gimenez at csic.es
Thu Jul 4 01:54:30 PDT 2013


Dear MARMAM members,


We are pleased to announce that a new publication on fin whales is
available in Rapid Communications in Mass Spectrometry.



Giménez, J., Gómez-Campos, E., Borrell, A., Cardona, L. and Aguilar, A.
2013. Isotopic evidence of limited exchange between Mediterranean and
eastern North Atlantic fin whales. Rapid Communications in Mass
Spectometry, 27: 1801–1806



Online version: http://onlinelibrary.wiley.com/doi/10.1002/rcm.6633/abstract



Abstract:


RATIONALE:

The relationship between stocks of fin whales inhabiting the temperate
eastern North Atlantic and the Mediterranean Sea is subject to controversy.
The use of chemical markers facilitates an alternative insight into
population structure and potential borders between stocks because the two
areas present dissimilar isotopic baselines.



METHODS:

Baleen plates, composed of inert tissue that keeps a permanent
chronological record of the isotopic value of body circulating fluids, were
used to investigate connectivity and boundaries between the stocks. Values
were determined by continuous flow isotope ratio mass spectrometry.



RESULTS:

Stable isotopes confirm that, while the two subpopulations generally forage
in well-differentiated grounds, some individuals with characteristic
Atlantic values do penetrate into the Mediterranean Sea up to the
northernmost latitudes of the region. As a consequence, the border between
the two putative subpopulations may be not as definite as previous acoustic
investigations suggested. The discriminant function obtained in this study
may assist researchers to use baleen plate isotopic data to assign the
origin of fin whales of uncertain provenance.



CONCLUSIONS:

This study strengthens the stock subdivision currently accepted for
management and conservation while recognizes a low level of exchange
between the Mediterranean and temperate eastern North Atlantic subdivisions.




Best regards,


-- 
*Joan Giménez Verdugo*
*Estación Biológica de Doñana (CSIC)
*
*Department of Conservation Biology*
Avenida Americo Vespucio s/n
41092 Sevilla
Mail: joan.gimenez at csic.es
Phone: 619176849
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