Population genetic structure of two congeneric deep-sea amphipod species from geographically isolated hadal trenches in the Pacific Ocean

H Ritchie, A J Jamieson, S B Piertney

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Abstract

The deep ocean trenches that comprise the hadal zone have traditionally been perceived as a series of geographically isolated and demographically independent features likely to promote local species endemism through potent natural selection and restricted dispersal. Here we provide the first descriptions of intraspecific population genetic structure among trenches from which the levels of genetic connectivity can be examined explicitly. A total of 109 individuals across two species of Paralicella amphipods (Lysianassoidea: Alicellidae) were genotyped at 16 microsatellite DNA loci. An analysis of molecular variance identified that 22% of the overall genetic variance was attributable to differences between the species and a further 7% was attributable to differences between populations. The two species showed different patterns of genetic structure, with the levels of genetic differentiation between trenches explained by geographical proximity, the geological ages of the trenches, contemporary bottom current patterns and seabed topography around the Pacific Ocean. Overall, the inferred levels of gene flow among trenches was sufficient to reject the hypothesis that they are evolutionarily independent units.
Original languageEnglish
Pages (from-to)50-57
Number of pages8
JournalDeep Sea Research Part I: Oceanographic Research Papers
Volume119
Early online date30 Nov 2016
DOIs
Publication statusPublished - Jan 2017

Fingerprint

amphipod
Pacific Ocean
Amphipoda
genetic structure
population genetics
trench
deep sea
ocean
genetic variance
natural selection
topography
gene flow
indigenous species
oceans
hadal zone
microsatellite repeats
genetic variation
loci
DNA
bottom current

Keywords

  • Hadal trenches
  • Amphipoda
  • deep sea ecology
  • Connectivity
  • Gene flow
  • Endemism

Cite this

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title = "Population genetic structure of two congeneric deep-sea amphipod species from geographically isolated hadal trenches in the Pacific Ocean",
abstract = "The deep ocean trenches that comprise the hadal zone have traditionally been perceived as a series of geographically isolated and demographically independent features likely to promote local species endemism through potent natural selection and restricted dispersal. Here we provide the first descriptions of intraspecific population genetic structure among trenches from which the levels of genetic connectivity can be examined explicitly. A total of 109 individuals across two species of Paralicella amphipods (Lysianassoidea: Alicellidae) were genotyped at 16 microsatellite DNA loci. An analysis of molecular variance identified that 22{\%} of the overall genetic variance was attributable to differences between the species and a further 7{\%} was attributable to differences between populations. The two species showed different patterns of genetic structure, with the levels of genetic differentiation between trenches explained by geographical proximity, the geological ages of the trenches, contemporary bottom current patterns and seabed topography around the Pacific Ocean. Overall, the inferred levels of gene flow among trenches was sufficient to reject the hypothesis that they are evolutionarily independent units.",
keywords = "Hadal trenches, Amphipoda, deep sea ecology, Connectivity, Gene flow, Endemism",
author = "H Ritchie and Jamieson, {A J} and Piertney, {S B}",
note = "This work was supported by the HADEEP projects, funded by the Nippon Foundation, Japan (2009765188), the Natural Environmental Research Council, UK (NE/E007171/1) and the Total Foundation, France. We acknowledge additional support from the Marine Alliance for Science and Technology for Scotland (MASTS) funded by the Scottish Funding Council (Ref: HR09011) and the Leverhulme Trust (to SBP). Additional sea time was supported by NIWA's ‘Impact of Resource Use on Vulnerable Deep-Sea Communities’ project (CO1_0906). We thank the chief scientists, crew and company of the Japanese RV Hakuho-Maru (KH0703 and KH0803), the RV Tansei-Maru (KT-09-03), the RV Kairei (KR0716), the German FS Sonne (SO197 and SO 209) and the New Zealand RV Kaharoa (KAH0190, KAH1109, KAH1202, KAH1301 and KAH1310). From NIWA, we thank Malcolm Clark, Ashley Rowden, Kareen Schnabel, Sadie Mills for logistical support at the NIWA Invertebrate Collection. We also thank Marius Wenzel for helpful comments on manuscript drafts, and Dr. Tammy Horton (NOCS, UK) and Naimh Kilgallen (Australian Museum, Sydney) for identification of amphipod samples.",
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T1 - Population genetic structure of two congeneric deep-sea amphipod species from geographically isolated hadal trenches in the Pacific Ocean

AU - Ritchie, H

AU - Jamieson, A J

AU - Piertney, S B

N1 - This work was supported by the HADEEP projects, funded by the Nippon Foundation, Japan (2009765188), the Natural Environmental Research Council, UK (NE/E007171/1) and the Total Foundation, France. We acknowledge additional support from the Marine Alliance for Science and Technology for Scotland (MASTS) funded by the Scottish Funding Council (Ref: HR09011) and the Leverhulme Trust (to SBP). Additional sea time was supported by NIWA's ‘Impact of Resource Use on Vulnerable Deep-Sea Communities’ project (CO1_0906). We thank the chief scientists, crew and company of the Japanese RV Hakuho-Maru (KH0703 and KH0803), the RV Tansei-Maru (KT-09-03), the RV Kairei (KR0716), the German FS Sonne (SO197 and SO 209) and the New Zealand RV Kaharoa (KAH0190, KAH1109, KAH1202, KAH1301 and KAH1310). From NIWA, we thank Malcolm Clark, Ashley Rowden, Kareen Schnabel, Sadie Mills for logistical support at the NIWA Invertebrate Collection. We also thank Marius Wenzel for helpful comments on manuscript drafts, and Dr. Tammy Horton (NOCS, UK) and Naimh Kilgallen (Australian Museum, Sydney) for identification of amphipod samples.

PY - 2017/1

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N2 - The deep ocean trenches that comprise the hadal zone have traditionally been perceived as a series of geographically isolated and demographically independent features likely to promote local species endemism through potent natural selection and restricted dispersal. Here we provide the first descriptions of intraspecific population genetic structure among trenches from which the levels of genetic connectivity can be examined explicitly. A total of 109 individuals across two species of Paralicella amphipods (Lysianassoidea: Alicellidae) were genotyped at 16 microsatellite DNA loci. An analysis of molecular variance identified that 22% of the overall genetic variance was attributable to differences between the species and a further 7% was attributable to differences between populations. The two species showed different patterns of genetic structure, with the levels of genetic differentiation between trenches explained by geographical proximity, the geological ages of the trenches, contemporary bottom current patterns and seabed topography around the Pacific Ocean. Overall, the inferred levels of gene flow among trenches was sufficient to reject the hypothesis that they are evolutionarily independent units.

AB - The deep ocean trenches that comprise the hadal zone have traditionally been perceived as a series of geographically isolated and demographically independent features likely to promote local species endemism through potent natural selection and restricted dispersal. Here we provide the first descriptions of intraspecific population genetic structure among trenches from which the levels of genetic connectivity can be examined explicitly. A total of 109 individuals across two species of Paralicella amphipods (Lysianassoidea: Alicellidae) were genotyped at 16 microsatellite DNA loci. An analysis of molecular variance identified that 22% of the overall genetic variance was attributable to differences between the species and a further 7% was attributable to differences between populations. The two species showed different patterns of genetic structure, with the levels of genetic differentiation between trenches explained by geographical proximity, the geological ages of the trenches, contemporary bottom current patterns and seabed topography around the Pacific Ocean. Overall, the inferred levels of gene flow among trenches was sufficient to reject the hypothesis that they are evolutionarily independent units.

KW - Hadal trenches

KW - Amphipoda

KW - deep sea ecology

KW - Connectivity

KW - Gene flow

KW - Endemism

U2 - 10.1016/j.dsr.2016.11.006

DO - 10.1016/j.dsr.2016.11.006

M3 - Article

VL - 119

SP - 50

EP - 57

JO - Deep Sea Research Part I: Oceanographic Research Papers

JF - Deep Sea Research Part I: Oceanographic Research Papers

SN - 0967-0637

ER -