Different speciation patterns in chemosynthetic snails: Alviniconcha and Ifremeria

The Abyssochrisidae are a diverse family of gastropods that inhabit reducing environments, primarily in the deep-sea. Two genera, Alviniconcha and Ifremeria, host sulfur-oxidizing endosymbionts and often occur together at western Pacific hydrothermal vents. Where they co-occur they typically form a “bulls-eye” pattern around the vents. Alviniconcha occupy the inner-most ring with the warmest, most sulfidic waters, wheras Ifremeria and Bathymodiolus brevior mussels occupy the next zone. Despite co-occurrence, the two snail genera host distinct phylotypes of sulfur-oxidizing epsilon- and gamma-proteobacteria that are acquired locally where the snails settle. Speciation patterns differ markedly in the two snails. Ifremeria comprises a monotypic genus with one species that exhibits partial to complete geographical isolation between populations inhabiting the Manus versus Lau and N. Fiji basins. In contrast, Alviniconcha comprises a crytpic species complex that includes six evolutionary lineages that we describe as distinct species. Allopatric and sympatric species are found in the Manus, N. Fiji, and Lau, and Mariana basins, and along the Central Indian Ridge. The montypic and polytypic genera differ in their dispersal modes and capabilities. Ifremeria nautilei brood “Waren’s” larvae, a posteriorly swimming pre-veliger that develops into a lecithotrophic veliger. We examined the geography, vent geochemistry, and symbiont identity among the distinct lineages of Alviniconcha spp. and I. nautilei to understand the distinct patterns of speciation between these genera.

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First Name: 
Shannon
Last Name: 
Johnson
Telephone: 
831-775-1772
Affiliation: 
Monterey Bay Aquarium Research Institute
First Name: 
Anders
Last Name: 
Waren
Affiliation: 
SMNH
First Name: 
Verena
Last Name: 
Tunicliffe
Affiliation: 
University of Victoria
First Name: 
Cindy
Last Name: 
Van Dover
Affiliation: 
Duke University Marine Laboratory
First Name: 
Tom
Last Name: 
Schultz
Affiliation: 
Duke University Marine Laboratory
First Name: 
Robert C.
Last Name: 
Vrijenhoek
Affiliation: 
MBARI
Choose keywords that are most applicable to your abstract. (Three maximum.): 
Distribution and abundance
Trophic relations (including symbiosis)
Evolutionary history (fossil and molecular data)
Abstract ID: 
CBE5-175