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Stable isotopes suggest the location of marine feeding grounds of South European Atlantic salmon in Greenland

Stable isotopes suggest the location of marine feeding grounds of South European Atlantic salmon in Greenland
Stable isotopes suggest the location of marine feeding grounds of South European Atlantic salmon in Greenland

Historical data on the oceanic distribution and migration routes of southernmost Atlantic salmon Salmo salar populations from Europe are almost non-existent, as no rigorous tagging initiatives have been conducted. Here, we used stable isotope data (δ 13C and δ 15N) of historic scale collections to identify the potential marine feeding areas of the largest salmon population in the Iberian Peninsula. Data were compared with published datasets from Northern Ireland, Wales, south England, and northeast UK coast, which correspond to series between 15-and 33-year long within the time period from 1958 to 2009. Temporal covariation in sea surface temperature, primary productivity, and δ 13C values suggests that feeding areas of Iberian salmon are located around Greenland, both in the Labrador and the Irminger seas. Furthermore, δ 13C values of Atlantic salmon from Canadian rivers reported in the literature are similar to those found in individuals from Spanish rivers. Our results suggest that Iberian salmon follow a westerly migration route towards Greenland instead of following the easterly branch of the North Atlantic current into the Norwegian Sea. Characterization of feeding patterns and migration routes might help to understand the causes of ongoing population decline and establish targeted conservation programmes for threatened Iberian salmon.

North Atlantic, Salmo salar, migration, scales, time series
1054-3139
593-603
Almodóvar, Ana
b05b98c6-afd2-4e74-9f79-de4d42e2db5c
Nicola, Graciela G
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Ayllón, Daniel
6a77e7ca-eb02-4e9b-8da7-e4d051f7feb4
Trueman, Clive N
d00d3bd6-a47b-4d47-89ae-841c3d506205
Davidson, Ian
4c354527-47b3-4da0-b46c-d61f79a63adc
Kennedy, Richard
de61698d-16e3-4146-b25d-c100c25a761d
Elvira, Benigno
e999dc7d-6bf6-42f9-a716-44a22f6656fe
Durif, Caroline
64a52a5b-d8b4-4082-ba27-daa72950cf65
Almodóvar, Ana
b05b98c6-afd2-4e74-9f79-de4d42e2db5c
Nicola, Graciela G
e487e07c-5d52-4b4a-8f47-2a7c6c65d000
Ayllón, Daniel
6a77e7ca-eb02-4e9b-8da7-e4d051f7feb4
Trueman, Clive N
d00d3bd6-a47b-4d47-89ae-841c3d506205
Davidson, Ian
4c354527-47b3-4da0-b46c-d61f79a63adc
Kennedy, Richard
de61698d-16e3-4146-b25d-c100c25a761d
Elvira, Benigno
e999dc7d-6bf6-42f9-a716-44a22f6656fe
Durif, Caroline
64a52a5b-d8b4-4082-ba27-daa72950cf65

Almodóvar, Ana, Nicola, Graciela G, Ayllón, Daniel, Trueman, Clive N, Davidson, Ian, Kennedy, Richard and Elvira, Benigno , Durif, Caroline (ed.) (2020) Stable isotopes suggest the location of marine feeding grounds of South European Atlantic salmon in Greenland. ICES Journal of Marine Science, 77 (2), 593-603. (doi:10.1093/icesjms/fsz258).

Record type: Article

Abstract

Historical data on the oceanic distribution and migration routes of southernmost Atlantic salmon Salmo salar populations from Europe are almost non-existent, as no rigorous tagging initiatives have been conducted. Here, we used stable isotope data (δ 13C and δ 15N) of historic scale collections to identify the potential marine feeding areas of the largest salmon population in the Iberian Peninsula. Data were compared with published datasets from Northern Ireland, Wales, south England, and northeast UK coast, which correspond to series between 15-and 33-year long within the time period from 1958 to 2009. Temporal covariation in sea surface temperature, primary productivity, and δ 13C values suggests that feeding areas of Iberian salmon are located around Greenland, both in the Labrador and the Irminger seas. Furthermore, δ 13C values of Atlantic salmon from Canadian rivers reported in the literature are similar to those found in individuals from Spanish rivers. Our results suggest that Iberian salmon follow a westerly migration route towards Greenland instead of following the easterly branch of the North Atlantic current into the Norwegian Sea. Characterization of feeding patterns and migration routes might help to understand the causes of ongoing population decline and establish targeted conservation programmes for threatened Iberian salmon.

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Mejia_Olivares_2nd_Review_without_track_changes_V2 - Accepted Manuscript
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Accepted/In Press date: 20 December 2019
e-pub ahead of print date: 25 January 2020
Published date: 1 March 2020
Keywords: North Atlantic, Salmo salar, migration, scales, time series

Identifiers

Local EPrints ID: 439687
URI: http://eprints.soton.ac.uk/id/eprint/439687
ISSN: 1054-3139
PURE UUID: 5aaa9b00-9941-469e-8f1e-b3426c2724fc

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Date deposited: 29 Apr 2020 16:31
Last modified: 27 Jan 2021 05:01

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