Application of stable isotopes to assess the feeding ecology of long-finned pilot whale ( Globicephala melas ) in the Northeast Atlantic Ocean

In order to improve our knowledge on the feeding ecology of long-finned pilot whales (Globicephala melas) in Northeast Atlantic waters, skin samples of 68 long-finned pilot whales stranded in Northwest Iberia (n = 22) and Scotland (n=46)were analysed using stable isotopes of δ13Candδ15N. Isotopic mi...

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Bibliographic Details
Published in:Journal of Experimental Marine Biology and Ecology
Main Authors: Monteiro, S, Ferreira, M, Vingada, JV, Lopez, A, Brownlow, A, Mendez-Fernandez, P
Format: Article in Journal/Newspaper
Language:English
Published: 2015
Subjects:
Feeding habitat
Isotopic mixing models
Marine mammals
Northeast Atlantic
Trophic relationships
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
name=SDG 14 - Life Below Water
Online Access:https://pure.sruc.ac.uk/en/publications/7299e50f-6ef6-4581-b9b7-85899f0eb844
https://doi.org/10.1016/j.jembe.2015.01.007
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Summary:In order to improve our knowledge on the feeding ecology of long-finned pilot whales (Globicephala melas) in Northeast Atlantic waters, skin samples of 68 long-finned pilot whales stranded in Northwest Iberia (n = 22) and Scotland (n=46)were analysed using stable isotopes of δ13Candδ15N. Isotopic mixing models were applied to obtain a quantitative estimate of the proportion of the main prey species in the diet of pilot whales. Stable isotope analysis revealed that 57.8–73.8% of the diet in Northwest Iberia consisted in curled octopus (Eledone cirrhosa), followed by European flying squid (Todarodes sagittatus), while in Scotland the predominant prey species was either Histioteuthis sp. or T. sagittatus, depending of the trophic enrichment factor applied. These results are generally in accordance with previous stomach content studies; however, the isotopic analysis may provide new information regarding key prey species and habitat use that could be missed or underestimated if only stomach contents analysis were used. Additionally, considering that the Atlantic Coast of Iberia was responsible for 95% of the landings of the main prey consumed by pilot whales in this area, between 2000 and 2010, these data provide trophic baseline information to be taken into account in fishery impact assessment studies and management decisions. © 2015 Elsevier B.V. All rights reserved.

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