Isotopic evidence of limited exchange between Mediterranean and eastern North Atlantic fin whales
Article first published online: 2 JUL 2013
Copyright © 2013 John Wiley & Sons, Ltd.
Rapid Communications in Mass Spectrometry
Volume 27, Issue 15, pages 1801–1806, 15 August 2013
How to Cite
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 Commun. Mass Spectrom., 27: 1801–1806. doi: 10.1002/rcm.6633
- Issue published online: 20 JUN 2013
- Article first published online: 2 JUL 2013
- Manuscript Accepted: 21 MAY 2013
- Manuscript Revised: 23 APR 2013
- Manuscript Received: 15 FEB 2013
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.
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.
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.
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. Copyright © 2013 John Wiley & Sons, Ltd.