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Biodiversity, biogeography, and connectivity of polychaetes in the world's largest marine minerals exploration frontier

Biodiversity, biogeography, and connectivity of polychaetes in the world's largest marine minerals exploration frontier
Biodiversity, biogeography, and connectivity of polychaetes in the world's largest marine minerals exploration frontier
Aim: the abyssal Clarion-Clipperton Zone (CCZ), Pacific Ocean, is an area of commercial importance owing to the growing interest in mining high-grade polymetallic nodules at the seafloor for battery metals. Research into the spatial patterns of faunal diversity, composition, and population connectivity is needed to better understand the ecological impacts of potential resource extraction. Here, a DNA taxonomy approach is used to investigate regional-scale patterns of taxonomic and phylogenetic alpha and beta diversity, and genetic connectivity, of the dominant macrofaunal group (annelids) across a 6 million km2 region of the abyssal seafloor.

Location: the abyssal seafloor (3932–5055 m depth) of the Clarion-Clipperton Zone, equatorial Pacific Ocean.

Methods: we used a combination of new and published barcode data to study 1866 polychaete specimens using molecular species delimitation. Both phylogenetic and taxonomic alpha and beta diversity metrics were used to analyse spatial patterns of biodiversity. Connectivity analyses were based on haplotype distributions for a subset of the studied taxa.

Results: DNA taxonomy identified 291–314 polychaete species from the COI and 16S datasets respectively. Taxonomic and phylogenetic beta diversity between sites were relatively high and mostly explained by lineage turnover. Over half of pairwise comparisons were more phylogenetically distinct than expected based on their taxonomic diversity. Connectivity analyses in abundant, broadly distributed taxa suggest an absence of genetic structuring driven by geographical location.

Main conclusions: species diversity in abyssal Pacific polychaetes is high relative to other deep-sea regions. Results suggest that environmental filtering, where the environment selects against certain species, may play a significant role in regulating spatial patterns of biodiversity in the CCZ. A core group of widespread species have diverse haplotypes but are well connected over broad distances. Our data suggest that the high environmental and faunal heterogeneity of the CCZ should be considered in future policy decisions.
abyssal, beta diversity, biodiversity, biogeography, connectivity, deep-sea mining, phylogeny, polychaeta, polymetallic nodules, population genetics
1472-4642
727-747
Stewart, Eva C.D.
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Bribiesca-Contreras, Guadalupe
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Taboada, Sergi
a064593b-c411-473a-ae9f-6c753ded9010
Wiklund, Helena
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Ravara, Ascensaõ
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Pape, Ellen
314f4ab7-3ca3-47b3-b235-cfa573bf6dd6
De Smet, Bart
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Neal, Lenka
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Cunha, M.R.
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Jones, Daniel O.B.
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Smith, Craig R.
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Glover, A.G.
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Dahlgren, Thomas G.
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Stewart, Eva C.D.
e33676c3-5ece-406b-91fd-dbd65912079d
Bribiesca-Contreras, Guadalupe
feb06280-2c3f-44de-a356-19e8de31e533
Taboada, Sergi
a064593b-c411-473a-ae9f-6c753ded9010
Wiklund, Helena
7c228af0-33a8-471f-b0f8-bc1e558cf8ed
Ravara, Ascensaõ
7ddbeac6-91b8-4d92-b28f-da6a46a6416e
Pape, Ellen
314f4ab7-3ca3-47b3-b235-cfa573bf6dd6
De Smet, Bart
b0790dcf-5fb6-43c8-bef3-378b07ab8c51
Neal, Lenka
5614d58b-de08-43a1-85d5-9baa8ed9c7c2
Cunha, M.R.
825eb17a-b31d-43aa-af0f-d3b7721a819c
Jones, Daniel O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Smith, Craig R.
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Glover, A.G.
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Dahlgren, Thomas G.
35e04ba6-303d-44d0-ae60-f434977dc0ff

Stewart, Eva C.D., Bribiesca-Contreras, Guadalupe, Taboada, Sergi, Wiklund, Helena, Ravara, Ascensaõ, Pape, Ellen, De Smet, Bart, Neal, Lenka, Cunha, M.R., Jones, Daniel O.B., Smith, Craig R., Glover, A.G. and Dahlgren, Thomas G. (2023) Biodiversity, biogeography, and connectivity of polychaetes in the world's largest marine minerals exploration frontier. Diversity and Distributions, 29 (6), 727-747. (doi:10.1111/ddi.13690).

Record type: Article

Abstract

Aim: the abyssal Clarion-Clipperton Zone (CCZ), Pacific Ocean, is an area of commercial importance owing to the growing interest in mining high-grade polymetallic nodules at the seafloor for battery metals. Research into the spatial patterns of faunal diversity, composition, and population connectivity is needed to better understand the ecological impacts of potential resource extraction. Here, a DNA taxonomy approach is used to investigate regional-scale patterns of taxonomic and phylogenetic alpha and beta diversity, and genetic connectivity, of the dominant macrofaunal group (annelids) across a 6 million km2 region of the abyssal seafloor.

Location: the abyssal seafloor (3932–5055 m depth) of the Clarion-Clipperton Zone, equatorial Pacific Ocean.

Methods: we used a combination of new and published barcode data to study 1866 polychaete specimens using molecular species delimitation. Both phylogenetic and taxonomic alpha and beta diversity metrics were used to analyse spatial patterns of biodiversity. Connectivity analyses were based on haplotype distributions for a subset of the studied taxa.

Results: DNA taxonomy identified 291–314 polychaete species from the COI and 16S datasets respectively. Taxonomic and phylogenetic beta diversity between sites were relatively high and mostly explained by lineage turnover. Over half of pairwise comparisons were more phylogenetically distinct than expected based on their taxonomic diversity. Connectivity analyses in abundant, broadly distributed taxa suggest an absence of genetic structuring driven by geographical location.

Main conclusions: species diversity in abyssal Pacific polychaetes is high relative to other deep-sea regions. Results suggest that environmental filtering, where the environment selects against certain species, may play a significant role in regulating spatial patterns of biodiversity in the CCZ. A core group of widespread species have diverse haplotypes but are well connected over broad distances. Our data suggest that the high environmental and faunal heterogeneity of the CCZ should be considered in future policy decisions.

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Accepted/In Press date: 27 February 2023
Published date: June 2023
Additional Information: Funding Information: We thank the masters, crew and technical staff on the RV Melville, RV Thomas G Thompson, M/V Pacific Constructor, M/V Mt. Mitchell and RV Sonne for their outstanding support. This research was supported by funding from UK Seabed Resources Ltd to the ABYSSLINE project (Lead PI C. R. Smith) and the Natural Environmental Research Council grants NE/S007210/1 and 'SMARTEX - Seabed Mining and Resilience to experimental Impact' NE/T002913/1, with additional support from the JPI-Oceans programme (Swedish Research Council FORMAS grant # 210-2014-1737 and The Norwegian Research Council for JPIO MiningImpact II grant #290931), and Portuguese funds through FCT—Fundação para a Ciência e a Tecnologia, within the special support to the pilot action “Ecological aspects of deep-sea mining”. Financial support was also provided by FCT/MCTES to CESAM (UIDP/50017/2020+UIDB/50017/2020+LA/P/0094/2020) and its team through national funds. ECDS was also funded by the Natural Environmental Research Grant NE/S007210/1. AR was funded by national funds (OE), through FCT, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19. ST received funding from the grant PID2020-117115GA-100 funded by MCIN/AEI/10.13039/50110001103 and from the grant PID2020-117115GA-100 funded by the MCIN/AEI/10.13039/501100011033 and by the Ramón y Cajal grant RYC2021-03152-I, funded by the MCIN/AEI/10.13039/501100011033 and the European Union «NextGenerationEU»/PRTR». EP and BDS were funded by a service agreement between Ghent University and Global Sea Mineral Resources NV. We acknowledge the continued support from the NHM-UK Consultancy team (Harry Rousham, Robyn Fryer, Kate Rowland). We received help sorting and sieving samples at sea from Magdalena Georgieva and Madeleine Brasier, and the entire ABYSSLINE science team in successful deep-sea coring operations. Funding Information: We thank the masters, crew and technical staff on the RV , RV , M/V , M/V and RV for their outstanding support. This research was supported by funding from UK Seabed Resources Ltd to the ABYSSLINE project (Lead PI C. R. Smith) and the Natural Environmental Research Council grants NE/S007210/1 and 'SMARTEX ‐ Seabed Mining and Resilience to experimental Impact' NE/T002913/1, with additional support from the JPI‐Oceans programme (Swedish Research Council FORMAS grant # 210‐2014‐1737 and The Norwegian Research Council for JPIO MiningImpact II grant #290931), and Portuguese funds through FCT—Fundação para a Ciência e a Tecnologia, within the special support to the pilot action “Ecological aspects of deep‐sea mining”. Financial support was also provided by FCT/MCTES to CESAM (UIDP/50017/2020+UIDB/50017/2020+LA/P/0094/2020) and its team through national funds. ECDS was also funded by the Natural Environmental Research Grant NE/S007210/1. AR was funded by national funds (OE), through FCT, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree‐Law 57/2016, of August 29, changed by Law 57/2017, of July 19. ST received funding from the grant PID2020‐117115GA‐100 funded by MCIN/AEI/10.13039/50110001103 and from the grant PID2020‐117115GA‐100 funded by the MCIN/AEI/10.13039/501100011033 and by the Ramón y Cajal grant RYC2021‐03152‐I, funded by the MCIN/AEI/10.13039/501100011033 and the European Union «NextGenerationEU»/PRTR». EP and BDS were funded by a service agreement between Ghent University and Global Sea Mineral Resources NV. We acknowledge the continued support from the NHM‐UK Consultancy team (Harry Rousham, Robyn Fryer, Kate Rowland). We received help sorting and sieving samples at sea from Magdalena Georgieva and Madeleine Brasier, and the entire ABYSSLINE science team in successful deep‐sea coring operations. Melville Thomas G Thompson Pacific Constructor Mt. Mitchell Sonne Funding Information: All study areas are located within the Clarion‐Clipperton Zone (CCZ) in the northeast equatorial Pacific Ocean, at depths from 3932 to 5055 m (Figure 1 ). The CCZ displays gradients in environmental conditions, including surface primary productivity and seafloor sediment characteristics (Washburn, Jones, et al., 2021 ), with changes occurring across an east‐west and north‐south axis. Mining exploration contracts from the ISA, as well as reserve areas and areas protected from mining, extend from 115°W to approximately 158°W, and from 22°N to 2.5°N. The exploration contract areas considered in this study were granted by the ISA to: the Federal Institute for Geosciences and Natural Resources of Germany (BGR, Germany); InterOceanMetal Joint Organisation (IOM, a country conglomerate involving Cuba, Bulgaria, Poland, the Russian Federation, Slovakia, and the Czech Republic); Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER, France); UK Seabed Resources Ltd (UK‐SRL, United Kingdom); Global Sea Mineral Resources NV (GSR, Belgium); and Ocean Mineral Singapore (OMS, Singapore). The ISA has also designated 13 APEIs as part of the REMP for the CCZ, of which two sites in APEI‐6 were considered for diversity analyses. One specimen which was opportunistically sampled from APEI‐7 was included in connectivity analyses (Figure 1 ). Publisher Copyright: © 2023 The Authors. Diversity and Distributions published by John Wiley & Sons Ltd.
Keywords: abyssal, beta diversity, biodiversity, biogeography, connectivity, deep-sea mining, phylogeny, polychaeta, polymetallic nodules, population genetics

Identifiers

Local EPrints ID: 481647
URI: http://eprints.soton.ac.uk/id/eprint/481647
ISSN: 1472-4642
PURE UUID: 71c95ac4-8277-4891-87aa-738eaf364b47
ORCID for Eva C.D. Stewart: ORCID iD orcid.org/0000-0001-8383-5705

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Date deposited: 05 Sep 2023 16:50
Last modified: 18 Mar 2024 04:02

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Contributors

Author: Guadalupe Bribiesca-Contreras
Author: Sergi Taboada
Author: Helena Wiklund
Author: Ascensaõ Ravara
Author: Ellen Pape
Author: Bart De Smet
Author: Lenka Neal
Author: M.R. Cunha
Author: Daniel O.B. Jones
Author: Craig R. Smith
Author: A.G. Glover
Author: Thomas G. Dahlgren

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