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Fine-scale population structure in a deep-sea teleost (orange roughy, Hoplostethus atlanticus)

Fine-scale population structure in a deep-sea teleost (orange roughy, Hoplostethus atlanticus)
Fine-scale population structure in a deep-sea teleost (orange roughy, Hoplostethus atlanticus)
Microsatellite and otolith chemistry variability were analysed to assess fine scale genetic structure in the deep-sea teleost orange roughy (Hoplostethus atlanticus). The Porcupine Bank located on the continental shelf west of Ireland, comprises a complex system of mounds and flat areas that are broken up by canyons. Orange roughy form spawning aggregations on mounds and flat areas, and were heavily fished until the resource was depleted. By analysing adults in spawning condition and juvenile orange roughy from six mounds and one flat area, shallow but significant genetic population structure was evident (FST=0.0031, Dest across loci=0.0306 and G-test). Most of the structure was accounted for by inclusion of a sample from the flats (six of ten significant pairwise FST estimates and G-tests, and five of the highest Dest estimates included the flat sample). While the flat sample contributed most to the genetic structure, there was still significant (albeit weaker) structure among mound samples. The observed structure was supported by otolith analyses. Fish caught as late juveniles in either the flat or mound areas showed consistent differences in chemistry at the otolith core throughout the initial 10 years of growth, which could indicate site fidelity. We hypothesise that seafloor topographic structures (mounds and flats) may provide discrete spawning areas for orange roughy and that the limited gene flow between these spawning areas is insufficient to counteract genetic drift.
Population structure, Seafloor topography, Microsatellite, Otolith chemistry, Orange roughy, Hoplostethus atlanticus
0967-0637
627-636
Carlsson, Jens
22fe02e2-ea88-4dde-af16-218f1a081288
Shephard, Samuel
07e57e5e-b433-4fce-a350-8ca7cb4366b6
Coughlan, James
d145baae-7437-4952-af45-45090584668c
Trueman, Clive N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Rogan, Emer
1ddb1335-3f01-4a66-8889-da0557c82e07
Cross, Tom F.
3462fb08-43e6-4932-aca2-500be200c702
Carlsson, Jens
22fe02e2-ea88-4dde-af16-218f1a081288
Shephard, Samuel
07e57e5e-b433-4fce-a350-8ca7cb4366b6
Coughlan, James
d145baae-7437-4952-af45-45090584668c
Trueman, Clive N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Rogan, Emer
1ddb1335-3f01-4a66-8889-da0557c82e07
Cross, Tom F.
3462fb08-43e6-4932-aca2-500be200c702

Carlsson, Jens, Shephard, Samuel, Coughlan, James, Trueman, Clive N., Rogan, Emer and Cross, Tom F. (2011) Fine-scale population structure in a deep-sea teleost (orange roughy, Hoplostethus atlanticus). Deep Sea Research Part I: Oceanographic Research Papers, 58 (6), 627-636. (doi:10.1016/j.dsr.2011.03.009).

Record type: Article

Abstract

Microsatellite and otolith chemistry variability were analysed to assess fine scale genetic structure in the deep-sea teleost orange roughy (Hoplostethus atlanticus). The Porcupine Bank located on the continental shelf west of Ireland, comprises a complex system of mounds and flat areas that are broken up by canyons. Orange roughy form spawning aggregations on mounds and flat areas, and were heavily fished until the resource was depleted. By analysing adults in spawning condition and juvenile orange roughy from six mounds and one flat area, shallow but significant genetic population structure was evident (FST=0.0031, Dest across loci=0.0306 and G-test). Most of the structure was accounted for by inclusion of a sample from the flats (six of ten significant pairwise FST estimates and G-tests, and five of the highest Dest estimates included the flat sample). While the flat sample contributed most to the genetic structure, there was still significant (albeit weaker) structure among mound samples. The observed structure was supported by otolith analyses. Fish caught as late juveniles in either the flat or mound areas showed consistent differences in chemistry at the otolith core throughout the initial 10 years of growth, which could indicate site fidelity. We hypothesise that seafloor topographic structures (mounds and flats) may provide discrete spawning areas for orange roughy and that the limited gene flow between these spawning areas is insufficient to counteract genetic drift.

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More information

Published date: June 2011
Keywords: Population structure, Seafloor topography, Microsatellite, Otolith chemistry, Orange roughy, Hoplostethus atlanticus

Identifiers

Local EPrints ID: 190107
URI: https://eprints.soton.ac.uk/id/eprint/190107
ISSN: 0967-0637
PURE UUID: 3f7a61de-8e4b-4404-aabc-9f356cb5691b

Catalogue record

Date deposited: 09 Jun 2011 10:59
Last modified: 18 Jul 2017 11:39

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