Host shifting and host sharing in a genus of specialist flies diversifying alongside their sunflower hosts
| Autor: | Robin K. Bagley, Marc A. Beer, Edward A. Lisowski, Andrew A. Forbes, Alaine C. Hippee, Marty Condon, Andrew Kitchen, Allen L. Norrbom |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Genetic Speciation Niche Introgression Helianthus grosseserratus 010603 evolutionary biology 01 natural sciences Coalescent theory 03 medical and health sciences Genus Animals Herbivory Clade Helianthus Phylogeny Ecology Evolution Behavior and Systematics Coevolution biology Host (biology) Tephritidae fungi food and beverages biology.organism_classification 030104 developmental biology Evolutionary biology Larva Hybrid speciation |
| DOI: | 10.1101/2020.03.18.995589 |
| Popis: | Congeneric parasites are unlikely to specialize on the same tissues of the same host species, likely because of strong multifarious selection against niche overlap. Exceptions where multiple congeneric species overlap on the same tissues may therefore reveal important insights into the ecological factors underlying the origins and maintenance of diversity. Larvae of sunflower maggot flies in genus Strauzia feed on the pith of plants in the family Asteraceae. Although Strauzia tend to be host specialists, some species overlap in their host use. To resolve the origins of host sharing among these specialist flies, we used reduced representation genomic sequencing to infer the first multi-locus phylogeny of genus Strauzia. Our results show that Helianthus tuberosus and Helianthus grosseserratus each host three different fly species, and that the flies co-occurring on a host are not one another’s closest relatives. Though this pattern implies that host sharing is most likely the result of host shifts, these may not be host shifts in the conventional sense of an insect moving onto an entirely new plant. Many hosts of Strauzia belong to a young (1-2 MYA) clade of perennial sunflowers noted for their frequent introgression and hybrid speciation events. In at least one case, flies may have converged upon a host after their respective ancestral host plants hybridized to form a new sunflower species (H. tuberosus). Broadly, we suggest that rapid and recent adaptive introgression and speciation in this group of plants may have instigated the diversification of their phytophagous fly associates, including the convergence of >1 species onto the same shared host plants. |
| Databáze: | OpenAIRE |
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