Multi-model seascape genomics identifies distinct environmental drivers of selection among sympatric marine species

BMC Evolutionary Biology

Sophie von der Heyden¹  Erica S. Nielsen¹  Romina Henriques²  Robert J. Toonen³  Maria Beger⁴ 

[1] Evolutionary Genomics Group, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, 7602, Matieland, South Africa;Evolutionary Genomics Group, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, 7602, Matieland, South Africa;Technical University of Denmark, National Institute of Aquatic Resources, Section for Marine Living Resources, Velsøvej 39, 8600, Silkeborg, Denmark;Hawaiʻi Institute of Marine Biology, University of Hawaiʻi at Mānoa, 96744, Kāne’ohe, HI, USA;School of Biology, Faculty of Biological Sciences, University of Leeds, LS2 9JT, Leeds, UK;

关键词: Pool-seq;    RAD-seq;    Seascape genomics;    Environmental association;    Comparative phylogeography;    Marine invertebrates;   

DOI  :  10.1186/s12862-020-01679-4

来源: Springer

【 摘 要 】

BackgroundAs global change and anthropogenic pressures continue to increase, conservation and management increasingly needs to consider species’ potential to adapt to novel environmental conditions. Therefore, it is imperative to characterise the main selective forces acting on ecosystems, and how these may influence the evolutionary potential of populations and species. Using a multi-model seascape genomics approach, we compare putative environmental drivers of selection in three sympatric southern African marine invertebrates with contrasting ecology and life histories: Cape urchin (Parechinus angulosus), Common shore crab (Cyclograpsus punctatus), and Granular limpet (Scutellastra granularis).ResultsUsing pooled (Pool-seq), restriction-site associated DNA sequencing (RAD-seq), and seven outlier detection methods, we characterise genomic variation between populations along a strong biogeographical gradient. Of the three species, only S. granularis showed significant isolation-by-distance, and isolation-by-environment driven by sea surface temperatures (SST). In contrast, sea surface salinity (SSS) and range in air temperature correlated more strongly with genomic variation in C. punctatus and P. angulosus. Differences were also found in genomic structuring between the three species, with outlier loci contributing to two clusters in the East and West Coasts for S. granularis and P. angulosus, but not for C. punctatus.ConclusionThe findings illustrate distinct evolutionary potential across species, suggesting that species-specific habitat requirements and responses to environmental stresses may be better predictors of evolutionary patterns than the strong environmental gradients within the region. We also found large discrepancies between outlier detection methodologies, and thus offer a novel multi-model approach to identifying the principal environmental selection forces acting on species. Overall, this work highlights how adding a comparative approach to seascape genomics (both with multiple models and species) can elucidate the intricate evolutionary responses of ecosystems to global change.

【 授权许可】

CC BY