Competitive environments induce shifts in host fidelity
2010 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 23, no 8, 1657-1663 p.Article in journal (Refereed) Published
Recent models support the idea of sympatric speciation as a result of the joint effects of disruptive selection and assortative mating. We present experimental data, testing models of speciation through frequency-dependent selection. We show that under high competition on a mixture of resources/hosts, strains of the Seed beetle, Callosobruchus maculatus, change their host fidelity and evolve a more generalistic behaviour in resource utilisation among females. The change in host fidelity did not result in disruptive selection and was not followed by assortative mating. This means that only one out of three fundamental prerequisites for sympatric speciation evolved as a result of the frequency-dependent selection. We conclude that for this process to work, a shift to a novel food resource as a result of selection must also lead to a loss of preference for the original source such that individuals are only able to use either one of the two.
Place, publisher, year, edition, pages
2010. Vol. 23, no 8, 1657-1663 p.
assortative mating, Callosobruchus maculatus, experimental evidence, frequency-dependent selection, host fidelity, resource preference, sympatric speciation
Research subject Biology with specialization in Animal Ecology
IdentifiersURN: urn:nbn:se:uu:diva-130110DOI: 10.1111/j.1420-9101.2010.02031.xISI: 000279901400008OAI: oai:DiVA.org:uu-130110DiVA: diva2:346455