Contrasting influences on bacterial symbiont specificity by co-occurring deep-sea mussels and tubeworms.

Abstract:

:Relationships fueled by sulfide between deep-sea invertebrates and bacterial symbionts are well known, yet the diverse overlapping factors influencing symbiont specificity are complex. For animals that obtain their symbionts from the environment, both host identity and geographic location can impact the ultimate symbiont partner. Bacterial symbionts were analysed for three co-occurring species each of Bathymodiolus mussels and vestimentiferan tubeworms, from three deep methane seeps off the west coast of Costa Rica. The bacterial internal transcribed spacer gene was analysed via direct and barcoded amplicon sequencing to reveal fine-scale symbiont diversity. Each of the three mussel species (B. earlougheri, B. billschneideri and B. nancyschneideri) hosted genetically distinct thiotrophic endosymbionts, despite living nearly side-by-side in their habitat, suggesting that host identity is crucial in driving symbiont specificity. The dominant thiotrophic symbiont of co-occurring tubeworms Escarpia spicata and Lamellibrachia (L. barhami and L. donwalshi), on the other hand, was identical regardless of host species or sample location, suggesting lack of influence by either factor on symbiont selectivity in this group of animals. These findings highlight the specific, yet distinct, influences on the environmental acquisition of symbionts in two foundational invertebrates with similar lifestyles, and provide a rapid, precise method of examining symbiont identities.

journal_name

Environ Microbiol Rep

authors

Brzechffa C,Goffredi SK

doi

10.1111/1758-2229.12909

subject

Has Abstract

pub_date

2020-11-16 00:00:00

issn

1758-2229

pub_type

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