The University of Southampton
University of Southampton Institutional Repository

Adaptive Evolution of Deep-Sea Amphipods from the Superfamily Lysiassanoidea in the North Atlantic

Adaptive Evolution of Deep-Sea Amphipods from the Superfamily Lysiassanoidea in the North Atlantic
Adaptive Evolution of Deep-Sea Amphipods from the Superfamily Lysiassanoidea in the North Atlantic
In this study we reconstruct phylogenies for deep sea amphipods from the North Atlantic in order to test hypotheses about the evolutionary mechanisms driving speciation in the deep sea. We sequenced five genes for specimens representing 21 families. Phylogenetic analyses showed incongruence between the molecular data and morphological taxonomy, with some morphologically distinct taxa showing close molecular similarity. Approximate dating of nodes based on available calibration suggested adaptation to the deep sea around the Cretaceous-Palaeogene boundary, with three identified lineages within the deep-sea radiation dating to the Eocene–Oligocene transition. Two of those lineages contained species currently classified in multiple families. We reconstructed ancestral nodes based on the mouthpart characters that define trophic guilds (also used to establish the current taxonomy), and show a consistent transition at the earliest node defining the deep-sea lineage, together with increasing diversification at more recent nodes within the deep-sea lineage. The data suggest that the divergence of species was adaptive, with successive diversification from a non-scavenging ancestor to ‘opportunistic’, ‘obligate’ and ‘specialised’ scavengers. We propose that the North Atlantic species studied provide a strong case for adaptive evolution promoted by ecological opportunity in the deep sea.
0071-3260
154-165
Corrigan, Laura J.
dc7eb941-8a4e-41e2-8243-dee3dceee0da
Horton, Tammy
c4b41665-f0bc-4f0f-a7af-b2b9afc02e34
Fotherby, Heather
d8d33ac9-e2dd-422c-a130-78c2e3326a38
White, Thomas A.
2931ffb7-7e61-4b81-ae37-859acea1f4b8
Hoelzel, A. Rus
2832caad-4faa-414f-85d2-3936e9abb37a
Corrigan, Laura J.
dc7eb941-8a4e-41e2-8243-dee3dceee0da
Horton, Tammy
c4b41665-f0bc-4f0f-a7af-b2b9afc02e34
Fotherby, Heather
d8d33ac9-e2dd-422c-a130-78c2e3326a38
White, Thomas A.
2931ffb7-7e61-4b81-ae37-859acea1f4b8
Hoelzel, A. Rus
2832caad-4faa-414f-85d2-3936e9abb37a

Corrigan, Laura J., Horton, Tammy, Fotherby, Heather, White, Thomas A. and Hoelzel, A. Rus (2014) Adaptive Evolution of Deep-Sea Amphipods from the Superfamily Lysiassanoidea in the North Atlantic. Evolutionary Biology, 41 (1), 154-165. (doi:10.1007/s11692-013-9255-2).

Record type: Article

Abstract

In this study we reconstruct phylogenies for deep sea amphipods from the North Atlantic in order to test hypotheses about the evolutionary mechanisms driving speciation in the deep sea. We sequenced five genes for specimens representing 21 families. Phylogenetic analyses showed incongruence between the molecular data and morphological taxonomy, with some morphologically distinct taxa showing close molecular similarity. Approximate dating of nodes based on available calibration suggested adaptation to the deep sea around the Cretaceous-Palaeogene boundary, with three identified lineages within the deep-sea radiation dating to the Eocene–Oligocene transition. Two of those lineages contained species currently classified in multiple families. We reconstructed ancestral nodes based on the mouthpart characters that define trophic guilds (also used to establish the current taxonomy), and show a consistent transition at the earliest node defining the deep-sea lineage, together with increasing diversification at more recent nodes within the deep-sea lineage. The data suggest that the divergence of species was adaptive, with successive diversification from a non-scavenging ancestor to ‘opportunistic’, ‘obligate’ and ‘specialised’ scavengers. We propose that the North Atlantic species studied provide a strong case for adaptive evolution promoted by ecological opportunity in the deep sea.

Text
Amph Phylo final paper and supplement.pdf - Accepted Manuscript
Download (2MB)

More information

Published date: March 2014
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 363618
URI: http://eprints.soton.ac.uk/id/eprint/363618
ISSN: 0071-3260
PURE UUID: e1975d72-2217-4c59-a213-ec1a57547925

Catalogue record

Date deposited: 27 Mar 2014 15:07
Last modified: 14 Mar 2024 16:26

Export record

Altmetrics

Contributors

Author: Laura J. Corrigan
Author: Tammy Horton
Author: Heather Fotherby
Author: Thomas A. White
Author: A. Rus Hoelzel

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×