Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Linking Acrosomal Morphotypes and Genetic Divergence in an Inter-Oceanic Mussel from Pacific and Atlantic Coasts: A Case of Incipient Speciation?

Carolina Briones
* ORCID logo ,
José J. Núñez
ORCID logo ,
Montse Pérez
,
Orlando Garrido
,
Bernardita Campos
,
Karina Godoy
,
Ricardo Hartley
ORCID logo ,
Pablo Oyarzún
,
Ricardo Guiñez
Version 1 : Received: 11 January 2024 / Approved: 12 January 2024 / Online: 12 January 2024 (10:42:17 CET)

A peer-reviewed article of this Preprint also exists.

Briones, C.; Nuñez, J.J.; Pérez, M.; Garrido, O.; Campos, B.; Godoy, K.; Hartley, R.; Oyarzún, P.A.; Guiñez, R. Linking Acrosome Size and Genetic Divergence in an Inter-Oceanic Mussel from the Pacific and Atlantic Coasts: A Case of Incipient Speciation? Animals 2024, 14, 674. Briones, C.; Nuñez, J.J.; Pérez, M.; Garrido, O.; Campos, B.; Godoy, K.; Hartley, R.; Oyarzún, P.A.; Guiñez, R. Linking Acrosome Size and Genetic Divergence in an Inter-Oceanic Mussel from the Pacific and Atlantic Coasts: A Case of Incipient Speciation? Animals 2024, 14, 674.

Abstract

In recent years, the advances in sperm morphology and genetic analyses in Perumytilus purpuratus allowed to suggest two evolutionary scenarios for this mussel: 1) the scenario of cryptic species and 2) the scenario of incipient or in progress speciation. To a better understanding of the evolutionary history of P. purpuratus, we performed an extensive sampling effort along a latitudinal gradient of ca. 7,180 km of coastline, from Southern Pacific to Atlantic Oceans and, we have also gone deeper in sperm morphology in P. purpuratus, exploring its association with phylogeny and population genetics to contrast if variability in sperm traits between northern and southern regions are signals of cryptic or incipient species. Overall, our results showed three sperm morphotypes and genetic structure in males of P. purpuratus strongly correlated. Additionally, we found evidence of a genetic admixture between lineages suggesting an introgressive hybridization zone at 38°S. These findings suggest the hypothesis that P. purpuratus is under incomplete reproductive isolation, with the presence of mechanisms of postzygotic isolation between lineages and, therefore, under an incipient or in fraganti speciation process. Finally, we discovered a new long morphotype for this species restricted to southern localities. Overall, our results support the hypothesis of historical events and postglacial recolonization as causal phenomena for the observed divergences.

Keywords

Bayesian method; ect-aquasperm; Last Glacial Maximum; Mytilidae; Perumytilus purpuratus; postglacial recolonization; reproductive isolation; sperm morphotypes

Subject

Biology and Life Sciences, Aquatic Science

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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