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Hybridization studies on the host races of Eurosta solidaginis: implications for sympatric speciation

, : Hybridization studies on the host races of Eurosta solidaginis: implications for sympatric speciation. Evolution 51(5): 1552-1560

The inheritance of survival ability in host-associated populations of the tephritid fly, Eurosta solidaginis, was studied. This fly induces galls on 2 species of goldenrod, Solidago altissima and S. gigantea, and it has been suggested that the host-associated populations are host races that originated in sympatry. Each host race had higher survival rates on its own host than on the other host, and F1 and backcross hybrids had lower survival rates than pure host-race flies on their host plant. Low hybrid survival appeared to be due to host adaptation by each population. F1 flies mated and oviposited normally and produced viable F2 backcross hybrids, which suggests that gene flow can occur between the host races. A small number of flies developed and emerged on the alternative host plant, illustrating that the genes needed to utilize the alternative host exist in the 2 host races. Survival ability was not found to be maternally influenced or sex linked.


DOI: 10.2307/2411207

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