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Title: | Evidence for a single population expansion event across 24,000 km: the case of the deep‑sea scavenging amphipod Abyssorchomene distinctus | Authors: | Dupont, Deborah W. E. Patel, Tasnim Kochzius, Marc SCHON, Isa |
Issue Date: | 2024 | Publisher: | SPRINGER | Source: | HYDROBIOLOGIA, | Status: | Early view | Abstract: | Anthropogenic activities such as mining pose a putative threat to deep-sea ecosystems and baseline studies of key indicator species are required to assess future loss of biodiversity. We examined population genetic structure, connectivity, cryptic diversity and phylogeography of the deep-sea scavenging amphipod, Abyssorchomene distinctus, using DNA sequence data (mitochondrial COI and nuclear 28S genes) from 373 specimens collected from six abyssal basins. We observed a striking absence of cryptic diversity, suggesting a single, widely distributed species in the Pacific and Indian Ocean. A single event of population expansion across distances up to 24,000 km is further supported by a main ancestral haplotype in the star-like shaped COI haplotype network, a skewed nucleotide mismatch distribution and deviations from evolutionary neutrality tests. In the Pacific, A. distinctus showed weak genetic population structure and low differentiation between the basins of the Clarion-Clipperton Zone and the DISCOL Experimental Area, suggesting a possible higher chance of recovery from deep-sea mining impacts. However, since our data indicate a single recent historic population expansion event, A. distinctus populations will likely be affected to unknown extents, as the exact drivers shaping distribution and dispersion of A. distinctus are still unclear. | Notes: | Dupont, DWE (corresponding author), Royal Belgian Inst Nat Sci, Operat Directorate Nat Environm, Freshwater Biol, Aquat & Terr Ecol, Vautierstr 29, B-1000 Brussels, Belgium. ddupontvalcy@naturalsciences.be |
Keywords: | Cryptic diversity;Deep-sea mining;Population genetic structure;Phylogeography;Population range expansion | Document URI: | http://hdl.handle.net/1942/42394 | ISSN: | 0018-8158 | e-ISSN: | 1573-5117 | DOI: | 10.1007/s10750-023-05447-5 | ISI #: | 001152348200001 | Rights: | The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024 | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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