Expansion of frozen hybrids in the guppy ectoparasite, Gyrodactylus turnbulli
| Autor: | Karolina J. Przesmycka, Jo Cable, Christoph Hahn, Mateusz Konczal, Ryan S. Mohammed, Jacek Radwan |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0301 basic medicine Gyrodactylus Population Zoology Asexual reproduction Outcrossing 010603 evolutionary biology 01 natural sciences Nucleotide diversity Fish Diseases 03 medical and health sciences heterosis Genetics medicine Animals Original Aricle Parasites Speciation and Hybridization clonal reproduction education hybridization Ecology Evolution Behavior and Systematics Hybrid Poecilia education.field_of_study biology invasion biology.organism_classification Guppy Gyrodactylus turnbulli Trinidad and Tobago 030104 developmental biology medicine.anatomical_structure Trematoda ORIGINAL ARTICLES |
| Zdroj: | Molecular Ecology |
| ISSN: | 1365-294X 0962-1083 |
| DOI: | 10.1111/mec.15781 |
| Popis: | Hybridization is one of the major factors contributing to the emergence of highly successful parasites. Hybrid vigour can play an important role in this process, but subsequent rounds of recombination in the hybrid population may dilute its effects. Increased fitness of hybrids can, however, be frozen by asexual reproduction. Here, we identify invasion of a ‘frozen hybrid’ genotype in natural populations of Gyrodactylus turnbulli, a facultatively sexual ectoparasitic flatworm that causes significant damage to its fish host. We resequenced genomes of these parasites infecting guppies from six Trinidad and Tobago populations, and found surprisingly high discrepancy in genome‐wide nucleotide diversity between islands. The elevated heterozygosity on Tobago is maintained by predominantly clonal reproduction of hybrids formed from two diverged genomes. Hybridization has been followed by spread of the hybrids across the island, implying a selective advantage compared with native genotypes. Our results thus highlight that a single outcrossing event may be independently sufficient to cause pathogen expansion. |
| Databáze: | OpenAIRE |
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