Distinct development trajectories and symbiosis modes in vent shrimps

• DOI: 10.1093/evolut/qpad217
• Publication Date: 2023-12-09T10:17:01Z
• Authors: Pierre Methou; Marion Guéganton; Jonathan T Copley; Hiromi Kayama Wat...; Florence Pradillon; Marie-Anne Cambon...; Chong Chen
• Keywords: Mid-Atlantic Ridge

Abstract Most animal species have a singular developmental pathway and adult ecology, but plasticity is well-known in some such as honeybees where castes display profoundly different morphology ecology. An intriguing case the Atlantic deep-sea hydrothermal vent shrimp pair Rimicaris hybisae R. chacei that share dominant COI haplotypes could represent very recently diverging lineages or even morphs of same species. symbiont-reliant with hypertrophied head chamber (in Mid-Cayman Spreading Centre), while mixotrophic narrow (on Mid-Atlantic Ridge). Here, we use X-ray micro-computed tomography fluorescence situ hybridization to show key anatomical shifts both occur during juvenile–subadult transition, when has fully established symbiosis not chacei. On Ridge, diet been hypothetically linked competition obligatorily symbiotic congener exoculata, find evidence exoculata indeed better adapted for symbiosis. We speculate possibility distinct development trajectories may be determined by symbiont colonization at “critical period” before subadulthood, though further genetic studies are warranted test this hypothesis along true relationship between