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Depth as a driver of evolution in the deep sea : insights from grenadiers (Gadiformes : Macrouridae) of the genus Coryphaenoides.

Gaither, Michelle and Violia, Biagio and Gray, Howard and Neat, Francis and Drazen, Jeffrey and Grubbs, Dean and Roa-Varón, Adela and Sutton, Tracey and Hoelzel, A. Rus (2016) 'Depth as a driver of evolution in the deep sea : insights from grenadiers (Gadiformes : Macrouridae) of the genus Coryphaenoides.', Molecular phylogenetics and evolution., 104 . pp. 73-82.

Abstract

Here we consider the role of depth as a driver of evolution in a genus of deep-sea fishes. We provide a phylogeny for the genus Coryphaenoides (Gadiformes: Macrouridae) that represents the breadth of habitat use and distributions for these species. In our consensus phylogeny species found at abyssal depths (> 4000 m) form a well-supported lineage, which interestingly also includes two non-abyssal species, C. striaturus and C. murrayi, diverging from the basal node of that lineage. Biogeographic analyses suggest the genus may have originated in the Southern and Pacific Oceans where contemporary species diversity is highest. The abyssal lineage seems to have arisen secondarily and likely originated in the Southern/Pacific Oceans but diversification of this lineage occurred in the Northern Atlantic Ocean. All abyssal species are found in the North Atlantic with the exception of C. yaquinae in the North Pacific and C. filicauda in the Southern Oceans. Abyssal species tend to have broad depth ranges and wide distributions, indicating that the stability of the deep oceans and the ability to live across wide depths may promote population connectivity and facilitate large ranges. We also confirm that morphologically defined subgenera do not agree with our phylogeny and that the Giant grenadier (formally Albatrossia pectoralis) belongs to Coryphaenoides, indicating that a taxonomic revision of the genus is needed. We discuss the implications of our findings for understanding the radiation and diversification of this genus, and the likely role of adaptation to the abyss.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1016/j.ympev.2016.07.027
Publisher statement:© 2016 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
Date accepted:25 July 2016
Date deposited:10 August 2016
Date of first online publication:27 July 2016
Date first made open access:No date available

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