Molecular phylogenetics of deep-sea amphipods (Eurythenes) reveal a new undescribed species at the Porcupine Abyssal Plain, North East Atlantic Ocean

Horton, Tammy; Cooper, Harry S.; Vlierboom, Rianna; Thurston, Michael H.; Hauton, Chris; Young, C. Robert

doi:10.1016/j.pocean.2020.102292

Cited by 10 publications

(10 citation statements)

References 20 publications

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“…were recovered in low numbers (two and one individuals, respectively). This possibly indicates a later arrival to the trap, as previously suggested (Horton et al, 2020a), indicating that collection of "rare" species necessitates increased time on the seabed. Despite the limited data with few deployments, our results suggest that abundance increases with deployment times (Supplementary S1).…”

Section: Morphological Diversity Of Scavenging Amphipodssupporting

confidence: 55%

“…In the western CCZ, representatives of Eg4 were found, along with a clade including the sequence TAI-1, but did not recover representatives of Eg5. The clade including the sequence TAI-1 includes specimens collected in the Pacific Ocean (Sea of Okhotsk: OKI-3 (Narahara-Nakano et al, 2018), and off Taiwan: TAI-1, and the western CCZ), but also a specimen collected in the Porcupine Abyssal Plain (DY077_83_B2; Horton et al, 2020a). In a recent revision of the genus Eurythenes (d'Udekem d'Acoz and Havermans, 2015), specimens from both clades Eg4 and Eg5 were included as voucher sequences for E. magellanicus, and a detailed morphological description was provided based on a specimen from Eg5.…”

Section: Species Delimitationmentioning

confidence: 99%

“…However, the overall relative abundance of the common species seem to be similar between the only replicated deployments on the abyssal plain on APEI 7, but relative abundances of P. caperesca decreased while P. tenuipes increased with longer bottom times. While longer deployment times seem to better recover "rare" species (Horton et al, 2020a), the dominance of new or "rare" species (Stephonyx sp. and Tectovalopsis sp.)…”

Section: Morphological Diversity Of Scavenging Amphipodsmentioning

confidence: 99%

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Biogeography and Connectivity Across Habitat Types and Geographical Scales in Pacific Abyssal Scavenging Amphipods

et al. 2021

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Recently, there has been a resurgent interest in the exploration of deep-sea mineral deposits, particularly polymetallic nodules in the Clarion-Clipperton Zone (CCZ), central Pacific. Accurate environmental impact assessment is critical to the effective management of a new industry and depends on a sound understanding of species taxonomy, biogeography, and connectivity across a range of scales. Connectivity is a particularly important parameter in determining ecosystem resilience, as it helps to define the ability of a system to recover post-impact. Scavenging amphipods in the superfamilies Alicelloidea Lowry and De Broyer, 2008 and Lysianassoidea Dana, 1849 contribute to a unique and abundant scavenging community in abyssal ecosystems. They are relatively easy to sample and in recent years have become the target of several molecular and taxonomic studies, but are poorly studied in the CCZ. Here, a molecular approach is used to identify and delimit species, and to investigate evolutionary relationships of scavenging amphipods from both abyssal plain and deep (>3000 m) seamount habitats in three APEIs (Areas of Particular Environmental Interest, i.e., designated conservation areas) in the western CCZ. A total of 17 different morphospecies of scavenging amphipods were identified, which include at least 30 genetic species delimited by a fragment of the cytochrome c oxidase subunit I (COI) barcode gene. The scavenging communities sampled in the western CCZ included the most common species (Abyssorchomene gerulicorbis (Shulenberger and Barnard, 1976), A. chevreuxi (Stebbing, 1906), Paralicella caperesca Shulenberger and Barnard, 1976, and P. tenuipes Chevreux, 1908) reported for other ocean basins. Only four morphospecies, representing five genetic species, were shared between APEIs 1, 4, and 7. The two abyssal plain sites at APEIs 4 and 7 were dominated by two and three of the most common scavenging species, respectively, while the APEI 1 seamount site was dominated by two species potentially new to science that appeared to be endemic to the site. The presence of common species in all sites and high genetic diversity, yet little geographic structuring, indicate connectivity over evolutionary time scales between the areas, which span about 1500 km. Similar to recent studies, the differences in amphipod assemblages found between the seamount and abyssal sites suggest that ecological conditions on seamounts generate distinct community compositions.

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Section: Morphological Diversity Of Scavenging Amphipodssupporting

confidence: 55%

Section: Species Delimitationmentioning

confidence: 99%

Section: Morphological Diversity Of Scavenging Amphipodsmentioning

confidence: 99%

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Biogeography and Connectivity Across Habitat Types and Geographical Scales in Pacific Abyssal Scavenging Amphipods

et al. 2021

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“…nov. within Eurythenes was investigated with publicly available data in two datasets, namely, 16S and COI. The comparative sequences were selected to represent type material, highconfident identifications, or from defined undescribed lineages (Table 2; France and Kocher 1996;Escobar-Briones et al 2010;Havermans et al 2013;d'Udekem d'Acoz and Havermans 2015;Ritchie et al 2015;Havermans 2016;Narahara-Nakano et al 2018;Ritchie et al 2017;Horton et al 2020;Weston et al 2020a). The sequences associated with Eurythenes cf.…”

Section: Dna Barcoding and Phylogeneticsmentioning

confidence: 99%

“…Since 2015, Eurythenes has expanded from three to nine described species (d'Udekem d 'Acoz and Havermans 2015;Narahara-Nakano et al 2018;Weston et al 2020a). Furthermore, at least five distinct genetic lineages are awaiting formal description (France and Kocher 1996;Havermans et al 2013;Eustace et al 2016;Horton et al 2020) and more are likely to be discovered via expansion of sampling programs (Havermans 2016).…”

Section: Introductionmentioning

confidence: 99%

Eurythenes atacamensis sp. nov. (Crustacea: Amphipoda) exhibits ontogenetic vertical stratification across abyssal and hadal depths in the Atacama Trench, eastern South Pacific Ocean

et al. 2021

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Eurythenes S.I. Smith in Scudder, 1882 (Crustacea: Amphipoda) are prevalent scavengers of the benthopelagic community from bathyal to hadal depths. While a well-studied genus, molecular systematic studies have uncovered cryptic speciation and multiple undescribed lineages. Here, we apply an integrative taxonomic approach and describe the tenth species, Eurythenes atacamensis sp. nov., based on specimens from the 2018 Atacamex and RV Sonne SO261 Expeditions to the southern sector of the Peru-Chile Trench, the Atacama Trench (24–⁠21°S). Eurythenes atacamensis sp. nov. is a large species, max. observed length 83.2 mm, possesses diagnostic features, including a short gnathopod 1 palm and a chelate gnathopod 2 palm, and a distinct genetic lineage based on a 16S rRNA and COI phylogeny. This species is a dominant bait-attending fauna with an extensive bathymetric range, spanning from 4974 to 8081 m. The RV Sonne SO261 specimens were recovered along a 10-station transect from abyssal to hadal depths and further examined for demographic and bathymetric-related patterns. Ontogenetic vertical stratification was evident across the trench axis, with only juveniles present at abyssal depths (4974–6025 m). Total length-depth analysis revealed that the size of females was unrelated to depth, whereas juveniles followed a sigmoidal relationship with a step-up in size at depths >7200 m. Thus, these bathymetric trends suggest that juveniles and females employ differing ecological strategies in subduction trench environments. This study highlights that even dominant and ecologically important species are still being discovered within the abyssal and hadal environments. Continued systematic expeditions will lead to an improved understanding of the eco-evolutionary drivers of speciation in the world’s largest ecosystem.

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Marine Benthic Amphipods (Amphipoda) of India: An Assessment on their Biodiversity, Distribution and Significance

Bhoi

Dubey²,

Patro³

2022

Thalassas

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Molecular phylogenetics of deep-sea amphipods (Eurythenes) reveal a new undescribed species at the Porcupine Abyssal Plain, North East Atlantic Ocean

Cited by 10 publications

References 20 publications

Biogeography and Connectivity Across Habitat Types and Geographical Scales in Pacific Abyssal Scavenging Amphipods

Biogeography and Connectivity Across Habitat Types and Geographical Scales in Pacific Abyssal Scavenging Amphipods

Eurythenes atacamensis sp. nov. (Crustacea: Amphipoda) exhibits ontogenetic vertical stratification across abyssal and hadal depths in the Atacama Trench, eastern South Pacific Ocean

Marine Benthic Amphipods (Amphipoda) of India: An Assessment on their Biodiversity, Distribution and Significance

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