Founder effects shape linkage disequilibrium and genomic diversity of a partially clonal invader
| Autor: | Erik E. Sotka, Chris C. Nice, Allan E. Strand, Courtney J. Murren, Stacy A. Krueger-Hadfield, Ben A. Flanagan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0301 basic medicine Linkage disequilibrium Range (biology) Demographic history Population Biology 010603 evolutionary biology 01 natural sciences Linkage Disequilibrium Nucleotide diversity Loss of heterozygosity 03 medical and health sciences Japan Genetics Humans education Ecology Evolution Behavior and Systematics education.field_of_study Genetic Variation Genomics Founder Effect Europe Genetics Population 030104 developmental biology Population bottleneck Evolutionary biology North America Founder effect |
| Zdroj: | Molecular Ecology. 30:1962-1978 |
| ISSN: | 1365-294X 0962-1083 |
| Popis: | The genomic variation of an invasive species may be affected by complex demographic histories and evolutionary changes during the invasion. Here, we describe the relative influence of bottlenecks, clonality, and population expansion in determining genomic variability of the widespread red macroalga Agarophyton vermiculophyllum. Its introduction from mainland Japan to the estuaries of North America and Europe coincided with shifts from predominantly sexual to partially clonal reproduction and rapid adaptive evolution. A survey of 62,285 SNPs for 351 individuals from 35 populations, aligned to 24 chromosome-length scaffolds indicate that linkage disequilibrium (LD), observed heterozygosity (Ho ), Tajima's D, and nucleotide diversity (Pi) were greater among non-native than native populations. Evolutionary simulations indicate LD and Tajima's D were consistent with a severe population bottleneck. Also, the increased rate of clonal reproduction in the non-native range could not have produced the observed patterns by itself but may have magnified the bottleneck effect on LD. Elevated marker diversity in the genetic source populations could have contributed to the increased Ho and Pi observed in the non-native range. We refined the previous invasion source region to a ~50km section of northeastern Honshu Island. Outlier detection methods failed to reveal any consistently differentiated loci shared among invaded regions, likely because of the complex A. vermiculophyllum demographic history. Our results reinforce the importance of demographic history, specifically founder effects, in driving genomic variation of invasive populations, even when localized adaptive evolution and reproductive system shifts are observed. |
| Databáze: | OpenAIRE |
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