Evidence for a single population expansion eventacross 24,000 km: the case of the deep‑sea scavengingamphipod Abyssorchomene distinctus

Déborah Whitney Euselia Dupont, Tasnim Patel, Marc Kochzius, Isa Schön

Onderzoeksoutput: Articlepeer review

Samenvatting

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 scav- enging 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 distrib- uted 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 net- work, 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 his- toric population expansion event, A. distinctus popu- lations will likely be affected to unknown extents, as the exact drivers shaping distribution and dispersion of A. distinctus are still unclear.
Originele taal-2English
Artikelnummerhttps://doi.org/10.1007/s10750-023-05447-5
Pagina's (van-tot)2309-2327
Aantal pagina's19
TijdschriftHydrobiologia
Volume851
Nummer van het tijdschrift10
DOI's
StatusPublished - 2024

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Publisher Copyright:
© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

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