Eurythenes sigmiferus and Eurythenes andhakarae (Crustacea Amphipoda) are sympatric at the abyssal Agulhas Fracture Zone, South Atlantic Ocean, and notes on their distributions
Eurythenes sigmiferus and Eurythenes andhakarae (Crustacea Amphipoda) are sympatric at the abyssal Agulhas Fracture Zone, South Atlantic Ocean, and notes on their distributions
Cryptic species in the deep ocean are rapidly being identified with molecular evidence and as a result, new species are being described. Consequently, our understanding of distributions among the revised landscape of species needs to be reassessed. A model example is the large scavenging amphipod, Eurythenes gryllus (Lichtenstein in Mandt, 1882), which historically was thought to have a eurybathic and cosmopolitan distribution. Molecular evidence has since led to the separation of E. gryllus into ten named species and truncating its range to bi-polar bathyal depths. This study focuses on two species; Eurythenes sigmiferus and Eurythenes andhakarae d'Udekem d'Acoz and Havermans, 2015, and presents new records of both species from 5,493 m in the previously unsampled Agulhas Fracture Zone, South Atlantic Ocean (42.77°S, 10.05°E). We paired morphology with DNA barcoding at two mitochondrial regions to achieve robust identification and assessed their wider geographic range by reassessing historical records. Their overlapping presence at the Agulhas Fracture Zone expands their known ranges to the non-polar South Atlantic Ocean. Specifically, for E. sigmiferus, the data suggests this species has a multi-ocean tropical to temperate distribution from abyssal to shallow hadal depths (3,410–6,097 m). Eurythenes andhakarae is not restricted to the Southern Ocean but is distributed across the Antarctic Polar Front to the temperate South Atlantic Ocean between abyssal and hadal depths (3,069–7,099 m), with a presence at bathyal depths requiring molecular confirmation. This study highlights that pairing new expeditions with a re-inspection of rich historical collections exploration can fill in data gaps across species ranges and, ultimately, biogeography.
Amphipoda, Antarctic polar front, Cryptic species, Deep sea, DNA barcoding, Historical collections, New records, Southern ocean
Weston, Johanna N.J.
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Stewart, Eva C.D.
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Maroni, Paige J.
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Stewart, Heather A.
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Jamieson, Alan J.
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June 2023
Weston, Johanna N.J.
1ee831db-93cc-49b4-894f-0c30b20275b0
Stewart, Eva C.D.
e33676c3-5ece-406b-91fd-dbd65912079d
Maroni, Paige J.
39d1919f-241a-4736-af76-257339a6473c
Stewart, Heather A.
72c4d700-17aa-42a2-9297-81050cbd3cb2
Jamieson, Alan J.
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Weston, Johanna N.J., Stewart, Eva C.D., Maroni, Paige J., Stewart, Heather A. and Jamieson, Alan J.
(2023)
Eurythenes sigmiferus and Eurythenes andhakarae (Crustacea Amphipoda) are sympatric at the abyssal Agulhas Fracture Zone, South Atlantic Ocean, and notes on their distributions.
Deep-Sea Research Part I: Oceanographic Research Papers, 196, [104050].
(doi:10.1016/j.dsr.2023.104050).
Abstract
Cryptic species in the deep ocean are rapidly being identified with molecular evidence and as a result, new species are being described. Consequently, our understanding of distributions among the revised landscape of species needs to be reassessed. A model example is the large scavenging amphipod, Eurythenes gryllus (Lichtenstein in Mandt, 1882), which historically was thought to have a eurybathic and cosmopolitan distribution. Molecular evidence has since led to the separation of E. gryllus into ten named species and truncating its range to bi-polar bathyal depths. This study focuses on two species; Eurythenes sigmiferus and Eurythenes andhakarae d'Udekem d'Acoz and Havermans, 2015, and presents new records of both species from 5,493 m in the previously unsampled Agulhas Fracture Zone, South Atlantic Ocean (42.77°S, 10.05°E). We paired morphology with DNA barcoding at two mitochondrial regions to achieve robust identification and assessed their wider geographic range by reassessing historical records. Their overlapping presence at the Agulhas Fracture Zone expands their known ranges to the non-polar South Atlantic Ocean. Specifically, for E. sigmiferus, the data suggests this species has a multi-ocean tropical to temperate distribution from abyssal to shallow hadal depths (3,410–6,097 m). Eurythenes andhakarae is not restricted to the Southern Ocean but is distributed across the Antarctic Polar Front to the temperate South Atlantic Ocean between abyssal and hadal depths (3,069–7,099 m), with a presence at bathyal depths requiring molecular confirmation. This study highlights that pairing new expeditions with a re-inspection of rich historical collections exploration can fill in data gaps across species ranges and, ultimately, biogeography.
Text
1-s2.0-S0967063723000894-main
More information
Accepted/In Press date: 21 April 2023
e-pub ahead of print date: 23 April 2023
Published date: June 2023
Additional Information:
Funding Information:
Sea time and logistics for the Five Deeps Expedition were supported and funded by Victor Vescovo of Caladan Oceanic LLC (United States). DNA barcoding was funded by the “Hadal Zones of Our Overseas Territories” by the Darwin Initiative funded by the UK Government ( DPLUS093 ) awarded to HAS . AJJ and PJM are supported by the Minderoo-UWA Deep-Sea Research Centre funded by the Minderoo Foundation , Australia, and JNJW through the Townsend Postdoctoral Scholarship Fund through the Woods Hole Oceanographic Institution , USA.
Keywords:
Amphipoda, Antarctic polar front, Cryptic species, Deep sea, DNA barcoding, Historical collections, New records, Southern ocean
Identifiers
Local EPrints ID: 481648
URI: http://eprints.soton.ac.uk/id/eprint/481648
ISSN: 0967-0637
PURE UUID: 07223285-688b-41aa-846f-269ef50e348e
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Date deposited: 05 Sep 2023 16:50
Last modified: 18 Mar 2024 04:02
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Contributors
Author:
Johanna N.J. Weston
Author:
Paige J. Maroni
Author:
Heather A. Stewart
Author:
Alan J. Jamieson
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