Population genetic signatures of diffuse co-evolution between leaf-cutting ants and their cultivar fungi

Molecular Ecology
Alexander S MikheyevJ J Boomsma

Abstract

Switching of symbiotic partners pervades most mutualisms, despite mechanisms that appear to enforce partner fidelity. To investigate the interplay of forces binding and dissolving mutualistic pairings, we investigated partner fidelity at the population level in the attine ant-fungal cultivar mutualism. The ants and their cultivars exhibit both broad-scale co-evolution, as well as cultivar switching, with short-term symbiont fidelity maintained by vertical transmission of maternal garden inoculates via dispersing queens and by the elimination of alien cultivar strains. Using microsatellite markers, we genotyped cultivar fungi associated with five co-occurring Panamanian attine ant species, representing the two most derived genera, leaf-cutters Atta and Acromyrmex. Despite the presence of mechanisms apparently ensuring the cotransmission of symbiont genotypes, different species and genera of ants sometimes shared identical fungus garden genotypes, indicating widespread cultivar exchange. The cultivar population was largely unstructured with respect to host ant species, with only 10% of the structure in genetic variance being attributable to partitioning among ant species and genera. Furthermore, despite significant genetic and ec...Continue Reading

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Citations

Nov 29, 2007·The ISME Journal·Nicole M Gerardo, Eric J Caldera
Jan 16, 2008·Proceedings of the National Academy of Sciences of the United States of America·Birgit C Schlick-SteinerRoss H Crozier
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