Snapping Shrimp Species Diversification: The Role Of Genome Size, Geography, And Ecology In Two Genera (Alpheus And Synalpheus)

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Snapping Shrimp Species Diversification: The Role Of Genome Size, Geography, And Ecology In Two Genera (Alpheus And Synalpheus)

The snapping shrimp genera Alpheus and Synalpheus, are two of the most well described and speciose genera of marine crustaceans and they offer unique opportunities to investigate the origins of biodiversity in the sea. Here we investigate how genome size, geography, and ecology contribute to species diversification within snapping shrimp. We examined five well resolved clades within the two genera (A. armatus, A. armillatus, A. bouvieri, A. floridanus, and S. gambarelloides). We find that genome size ranges approximately four-fold across the species examined within Alpheus. We reconstructed the ancestral state of genome size and found that, of the clades examined, genome size estimates were similar across ancestral nodes but exhibited high variance across contemporary species. Age-range correlation (ARC) analyses were used to quantify pre-dominant geographic mode of speciation of free-living and symbiotic clades. Free-living clades all were consistent with an allopatric mode of speciation while ARC results from symbiotic clades suggested multiple instances of speciation in sympatry. Linear regressions from ARC analyses between free-living and symbiotic snapping shrimp clades were significantly different (P = 0.02) which suggests that ecology (specifically symbiotic interactions) may facilitate reproductive isolation despite geographic overlap. Results from this study contribute to our understanding of the geographic mode and underlying mechanisms of diversification in snapping shrimp and may serve as a model for investigating the evolutionary origins of biodiversity in other marine invertebrates.

title: Snapping Shrimp Species Diversification: The Role Of Genome Size, Geography, And Ecology In Two Genera (Alpheus And Synalpheus)

creator: Ryan Hanscom

subject: Biology [0306] - primary

description: The snapping shrimp genera Alpheus and Synalpheus, are two of the most well described and speciose genera of marine crustaceans and they offer unique opportunities to investigate the origins of biodiversity in the sea. Here we investigate how genome size, geography, and ecology contribute to species diversification within snapping shrimp. We examined five well resolved clades within the two genera (A. armatus, A. armillatus, A. bouvieri, A. floridanus, and S. gambarelloides). We find that genome size ranges approximately four-fold across the species examined within Alpheus. We reconstructed the ancestral state of genome size and found that, of the clades examined, genome size estimates were similar across ancestral nodes but exhibited high variance across contemporary species. Age-range correlation (ARC) analyses were used to quantify pre-dominant geographic mode of speciation of free-living and symbiotic clades. Free-living clades all were consistent with an allopatric mode of speciation while ARC results from symbiotic clades suggested multiple instances of speciation in sympatry. Linear regressions from ARC analyses between free-living and symbiotic snapping shrimp clades were significantly different (P = 0.02) which suggests that ecology (specifically symbiotic interactions) may facilitate reproductive isolation despite geographic overlap. Results from this study contribute to our understanding of the geographic mode and underlying mechanisms of diversification in snapping shrimp and may serve as a model for investigating the evolutionary origins of biodiversity in other marine invertebrates.

contributor: Tennessee Technological University

date: 2020-04-16

type: text

publisher: Tennessee Technological University. Archives and Special Collections

language: English

rights: In Copyright

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