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Species diversity in the cryptic abyssal holothurian Psychropotes longicauda (Echinodermata)

Species diversity in the cryptic abyssal holothurian Psychropotes longicauda (Echinodermata)
Species diversity in the cryptic abyssal holothurian Psychropotes longicauda (Echinodermata)
Despite the plethora of studies on swallow-water invertebrates, almost nothing is known about the evolution and population structure of deep-sea species at the global scale. The aim of this study was to assess phylogeographic patterns of a common and cosmopolitan, predominantly abyssal sea cucumber, Psychropotes longicauda, based on samples from the Atlantic, Southern, Indian and Pacific oceans. Sequences of the mitochondrial COI and 16S genes were analysed for 128 specimens of P. longicauda. In addition, temporal genetic variation was investigated at one site, the Porcupine Abyssal Plain, NE Atlantic Ocean over a period of 34 years. Two distinct lineages within the global distribution were identified. The sister clades probably could be classified as separate species based on the observed genetic divergence (>5.0%) and phylogenetic reconstruction with indications of a Southern Hemisphere origin. Moreover, significant population differentiation was detected between the North Atlantic and localities in both the Pacific and Indian oceans. No bathymetric structuring was detected among lineages. Temporal genetic shifts were detected in a time series of samples from 1977 to 2011. Our data confirm the previously suspected cryptic species diversity throughout the wide distributional range previously attributed to the single species P. longicauda. The presence of sympatric species in the North Pacific and Indian Oceans has been underestimated by previous morphological analyses. The differentiation at the population level detected in the main lineages among the four oceans could suggest restricted gene flow despite wide-scale dispersal potential of the species.
0967-0645
288-296
Gubili, Chrysoula
ea448851-2a12-45da-a5e4-96cc63bacb01
Ross, Elizabeth
b19ceb95-21fd-4258-8f0b-830a91bd71b6
Billett, David S.M.
aab439e2-c839-4cd2-815c-3d401e0468db
Yool, Andrew
882aeb0d-dda0-405e-844c-65b68cce5017
Tsairidis, Charalampos
1a76c0c1-a33b-4777-b284-9b7b04bebeb2
Ruhl, Henry A.
177608ef-7793-4911-86cf-cd9960ff22b6
Rogacheva, Antonina
243fa2a0-f901-4dce-95aa-41afc762a2d7
Masson, Doug
4ff55249-e465-4bee-869b-db05e5db43b4
Tyler, Paul A.
d1965388-38cc-4c1d-9217-d59dba4dd7f8
Hauton, Chris
7706f6ba-4497-42b2-8c6d-00df81676331
Gubili, Chrysoula
ea448851-2a12-45da-a5e4-96cc63bacb01
Ross, Elizabeth
b19ceb95-21fd-4258-8f0b-830a91bd71b6
Billett, David S.M.
aab439e2-c839-4cd2-815c-3d401e0468db
Yool, Andrew
882aeb0d-dda0-405e-844c-65b68cce5017
Tsairidis, Charalampos
1a76c0c1-a33b-4777-b284-9b7b04bebeb2
Ruhl, Henry A.
177608ef-7793-4911-86cf-cd9960ff22b6
Rogacheva, Antonina
243fa2a0-f901-4dce-95aa-41afc762a2d7
Masson, Doug
4ff55249-e465-4bee-869b-db05e5db43b4
Tyler, Paul A.
d1965388-38cc-4c1d-9217-d59dba4dd7f8
Hauton, Chris
7706f6ba-4497-42b2-8c6d-00df81676331

Gubili, Chrysoula, Ross, Elizabeth, Billett, David S.M., Yool, Andrew, Tsairidis, Charalampos, Ruhl, Henry A., Rogacheva, Antonina, Masson, Doug, Tyler, Paul A. and Hauton, Chris (2017) Species diversity in the cryptic abyssal holothurian Psychropotes longicauda (Echinodermata). Deep Sea Research Part II: Topical Studies in Oceanography, 137, 288-296. (doi:10.1016/j.dsr2.2016.04.003).

Record type: Article

Abstract

Despite the plethora of studies on swallow-water invertebrates, almost nothing is known about the evolution and population structure of deep-sea species at the global scale. The aim of this study was to assess phylogeographic patterns of a common and cosmopolitan, predominantly abyssal sea cucumber, Psychropotes longicauda, based on samples from the Atlantic, Southern, Indian and Pacific oceans. Sequences of the mitochondrial COI and 16S genes were analysed for 128 specimens of P. longicauda. In addition, temporal genetic variation was investigated at one site, the Porcupine Abyssal Plain, NE Atlantic Ocean over a period of 34 years. Two distinct lineages within the global distribution were identified. The sister clades probably could be classified as separate species based on the observed genetic divergence (>5.0%) and phylogenetic reconstruction with indications of a Southern Hemisphere origin. Moreover, significant population differentiation was detected between the North Atlantic and localities in both the Pacific and Indian oceans. No bathymetric structuring was detected among lineages. Temporal genetic shifts were detected in a time series of samples from 1977 to 2011. Our data confirm the previously suspected cryptic species diversity throughout the wide distributional range previously attributed to the single species P. longicauda. The presence of sympatric species in the North Pacific and Indian Oceans has been underestimated by previous morphological analyses. The differentiation at the population level detected in the main lineages among the four oceans could suggest restricted gene flow despite wide-scale dispersal potential of the species.

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More information

Published date: 1 March 2017
Organisations: Marine Systems Modelling, Ocean and Earth Science, Ocean Biochemistry & Ecosystems, National Oceanography Centre, Marine Biology & Ecology

Identifiers

Local EPrints ID: 407972
URI: http://eprints.soton.ac.uk/id/eprint/407972
ISSN: 0967-0645
PURE UUID: 297a78d2-8ca5-4cf0-b74a-bd559d1aa2ab
ORCID for Chris Hauton: ORCID iD orcid.org/0000-0002-2313-4226

Catalogue record

Date deposited: 06 May 2017 01:01
Last modified: 27 Apr 2022 01:38

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Contributors

Author: Chrysoula Gubili
Author: Elizabeth Ross
Author: David S.M. Billett
Author: Andrew Yool
Author: Charalampos Tsairidis
Author: Henry A. Ruhl
Author: Antonina Rogacheva
Author: Doug Masson
Author: Paul A. Tyler
Author: Chris Hauton ORCID iD

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