Azofeifa-Solano

Bauer

Bruce

Corey

De Marisco

Hayes

Hoeksema

Khan

Lanyon

Limbaugh

Mascaro

McKeon

R Core Team

Ross

Rothstein

Salthe

Schemske

Silbiger

Spotte

Stanton

Stearns

Thompson

West-Eberhard

Wicksten

PeerJ

Symbiotic interactions, where two species occur in close physical proximity for the majority of the participants’ lifespans, may constrain the fitness of one or both of the participants. Host choice could result in lineage divergence in symbionts if fitness benefits vary across the interaction with hosts. Symbiotic interactions are common in the marine environment, particularly in the most diverse marine ecosystems: coral reefs. However, the variation in symbiotic interactions that may drive diversification is poorly understood in marine systems. We measured the fecundity of the symbiotic shrimpPericlimenes yucatanicuson two anemone hosts on coral reefs in Panama, and found that while fecundity varies among host species, this variation is explained largely by host size, not species. This suggests that shrimp on larger hosts may have higher fitness regardless of host species, which in turn could drive selection for host choice, a proposed driver of diversification in this group.</jats:p

Figure S1: Quantile-quantile plot of residuals

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