Barriers to gene flow in the deepest ocean ecosystems: evidence from global population genomics of a cosmopolitan amphipod
Weston, Johanna N.J.; Jensen, Evelyn L.; Hasoon, Megan S.R.; Kitson, James J.N.; Stewart, Heather A.; Jamieson, Alan J.. 2022 Barriers to gene flow in the deepest ocean ecosystems: evidence from global population genomics of a cosmopolitan amphipod. Science Advances, 8 (43), 6672. 10.1126/sciadv.abo6672
Before downloading, please read NORA policies.Preview |
Text (Open Access Paper)
sciadv.abo6672.pdf - Published Version Available under License Creative Commons Attribution Non-commercial 4.0. Download (1MB) | Preview |
Abstract/Summary
The deepest marine ecosystem, the hadal zone, hosts endemic biodiversity resulting from geographic isolation and environmental selection pressures. However, the pan-ocean distribution of some fauna challenges the concept that the hadal zone is a series of isolated island-like habitats. Whether this remains true at the population genomic level is untested. We investigated phylogeographic patterns of the amphipod, Bathycallisoma schellenbergi, from 12 hadal features across the Pacific, Atlantic, Indian, and Southern oceans and analyzed genome-wide single-nucleotide polymorphism markers and two mitochondrial regions. Despite a cosmopolitan distribution, populations were highly restricted to individual features with only limited gene flow between topographically connected features. This lack of connectivity suggests that populations are on separate evolutionary trajectories, with evidence of potential cryptic speciation at the Atacama Trench. Together, this global study demonstrates that the shallower ocean floor separating hadal features poses strong barriers to dispersal, driving genetic isolation and creating pockets of diversity to conserve.
Item Type: | Publication - Article |
---|---|
Digital Object Identifier (DOI): | 10.1126/sciadv.abo6672 |
ISSN: | 2375-2548 |
Date made live: | 28 Nov 2022 14:52 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/533635 |
Actions (login required)
View Item |
Document Downloads
Downloads for past 30 days
Downloads per month over past year