Genome-wide phylogeography reveals cryptic speciation in the circumglobal planktonic calcifier Limacina bulimoides. ...

• Main Authors: Choo, L Q, Spagliardi, G, Malinsky, M, Choquet, M, Goetze, E, Hoarau, G, Peijnenburg, K T C A
• Format: Text
• Language: unknown
• Published: Wiley 2023
• Subjects: 570 Life sciences; biology; Pacific; Indian; Ocean acidification
• Online Access: https://dx.doi.org/10.48350/180465; https://boris.unibe.ch/180465/

Little is known about when and how planktonic species arise and persist in the open ocean without apparent dispersal barriers. Pteropods are planktonic snails with thin shells susceptible to dissolution that are used as bio-indicators of ocean acidification. However, distinct evolutionary units respond to acidification differently and defining species boundaries is therefore crucial for predicting the impact of changing ocean conditions. In this global population genomic study of the shelled pteropod Limacina bulimoides, we combined genetic (759,000 single nucleotide polymorphisms) and morphometric data from 161 individuals, revealing three major genetic lineages (FST = 0.29 to 0.41): an 'Atlantic lineage' sampled across the Atlantic, an 'Indo-Pacific lineage' sampled in the North Pacific and Indian Ocean, and a 'Pacific lineage' sampled in the North and South Pacific. A time-calibrated phylogeny suggests that the lineages diverged about one million years ago, with estimated effective population size ...