Otolith geochemistry indicates life-long spatial population structuring in a deep-sea fish, Coryphaenoides rupestris
Otolith geochemistry indicates life-long spatial population structuring in a deep-sea fish, Coryphaenoides rupestris
Little is understood about connectivity of deep-sea fish populations. Analysis of the geochemical properties of fish otoliths is one way to draw inferences regarding their movements and habitat use in the marine environment. Trace element and stable isotope analyses of otoliths were undertaken to assess patterns of spatial and temporal population structure of a wide-ranging deepwater fish, the roundnose grenadier Coryphaenoides rupestris. Fish were sampled from 4 locations across the distribution range of the species in the northeast Atlantic. Multivariate analyses of elemental ratios (Li/Ca, Mn/Ca, Ba/Ca, Zn/Ca, Cu/Ca) revealed strong geographic separation at each life stage, and an overall significant difference between life stages. Otolith oxygen (?18O) and carbon (?13C) stable isotope analysis indicated a depth migration (and reduction in metabolic activity) from relatively shallow in the juvenile phase to much deeper in the adult phase at all locations. The results suggest that roundnose grenadier are comprised of geographically distinct population units that persist throughout their life-history, migrating deeper as they get older.
Roundnose grenadier, North Atlantic, Otolith microchemistry, Stable isotopes, Population connectivity, Laser ablation ICP-MS
209-224
Longmore, C.
5e712f1d-75d2-4fed-8d9a-3835d314394e
Trueman, C.N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Neat, F.
9b5d7a58-f030-4baa-9bb0-a123f5ca14f5
O’Gorman, E.J.
3b2e2598-416f-4517-89cc-885bdfb9301d
Milton, J.A.
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Mariani, S.
905442ec-005a-4de4-81b6-454b31d69ae8
2011
Longmore, C.
5e712f1d-75d2-4fed-8d9a-3835d314394e
Trueman, C.N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Neat, F.
9b5d7a58-f030-4baa-9bb0-a123f5ca14f5
O’Gorman, E.J.
3b2e2598-416f-4517-89cc-885bdfb9301d
Milton, J.A.
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Mariani, S.
905442ec-005a-4de4-81b6-454b31d69ae8
Longmore, C., Trueman, C.N., Neat, F., O’Gorman, E.J., Milton, J.A. and Mariani, S.
(2011)
Otolith geochemistry indicates life-long spatial population structuring in a deep-sea fish, Coryphaenoides rupestris.
Marine Ecology Progress Series, 435, .
(doi:10.3354/meps/09197).
Abstract
Little is understood about connectivity of deep-sea fish populations. Analysis of the geochemical properties of fish otoliths is one way to draw inferences regarding their movements and habitat use in the marine environment. Trace element and stable isotope analyses of otoliths were undertaken to assess patterns of spatial and temporal population structure of a wide-ranging deepwater fish, the roundnose grenadier Coryphaenoides rupestris. Fish were sampled from 4 locations across the distribution range of the species in the northeast Atlantic. Multivariate analyses of elemental ratios (Li/Ca, Mn/Ca, Ba/Ca, Zn/Ca, Cu/Ca) revealed strong geographic separation at each life stage, and an overall significant difference between life stages. Otolith oxygen (?18O) and carbon (?13C) stable isotope analysis indicated a depth migration (and reduction in metabolic activity) from relatively shallow in the juvenile phase to much deeper in the adult phase at all locations. The results suggest that roundnose grenadier are comprised of geographically distinct population units that persist throughout their life-history, migrating deeper as they get older.
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Published date: 2011
Keywords:
Roundnose grenadier, North Atlantic, Otolith microchemistry, Stable isotopes, Population connectivity, Laser ablation ICP-MS
Organisations:
Geochemistry
Identifiers
Local EPrints ID: 197059
URI: http://eprints.soton.ac.uk/id/eprint/197059
PURE UUID: 9122f88a-a117-4f28-9c5a-b1cef1ceb8e9
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Date deposited: 16 Sep 2011 13:16
Last modified: 15 Mar 2024 03:17
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Contributors
Author:
C. Longmore
Author:
F. Neat
Author:
E.J. O’Gorman
Author:
S. Mariani
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