Co‐evolutionary patterns and diversification of ant–fungus associations in the asexual fungus‐farming ant Mycocepurus smithii in Panama

Partner fidelity through vertical symbiont transmission is thought to be the primary mechanism stabilizing cooperation in the mutualism between fungus‐farming (attine) ants and their cultivated fungal symbionts. An alternate or additional mechanism could be adaptive partner or symbiont choice mediat...

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Published in:Journal of evolutionary biology 2013-06, Vol.26 (6), p.1353-1362
Main Authors: Kellner, K, Fernández‐Marín, H, Ishak, H. D, Sen, R, Linksvayer, T. A, Mueller, U. G
Format: Article
Language:English
Subjects:
Animals
Ants - genetics
Ants - microbiology
Ants - physiology
Biological Evolution
co‐evolution
Cultivars
DNA - isolation & purification
domestication
Evolutionary biology
Formicidae
Fungi
Fungi - physiology
gardens
Genotype & phenotype
genotyping
host specificity
host switching
Insects
internal transcribed spacers
microsatellite repeats
Molecular Sequence Data
mutation
mutualism
Mycocepurus smithii
ribosomal DNA
symbionts
Symbiosis
thelytoky
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Summary:Partner fidelity through vertical symbiont transmission is thought to be the primary mechanism stabilizing cooperation in the mutualism between fungus‐farming (attine) ants and their cultivated fungal symbionts. An alternate or additional mechanism could be adaptive partner or symbiont choice mediating horizontal cultivar transmission or de novo domestication of free‐living fungi. Using microsatellite genotyping for the attine ant Mycocepurus smithii and ITS rDNA sequencing for fungal cultivars, we provide the first detailed population genetic analysis of local ant–fungus associations to test for the relative importance of vertical vs. horizontal transmission in a single attine species. M. smithii is the only known asexual attine ant, and it is furthermore exceptional because it cultivates a far greater cultivar diversity than any other attine ant. Cultivar switching could permit the ants to re‐acquire cultivars after garden loss, to purge inferior cultivars that are locally mal‐adapted or that accumulated deleterious mutations under long‐term asexuality. Compared to other attine ants, symbiont choice and local adaptation of ant–fungus combinations may play a more important role than partner‐fidelity feedback in the co‐evolutionary process of M. smithii and its fungal symbionts.
ISSN:1010-061X
1420-9101
DOI:10.1111/jeb.12140