Lack of fidelity revealed in an insect–fungal mutualism after invasion

作者: Amy L. Wooding , Michael J. Wingfield , Brett P. Hurley , Jeffrey R. Garnas , Peter de Groot

DOI: 10.1098/RSBL.2013.0342

关键词: SymbiosisSirex woodwaspSirexAmylostereum areolatumBiologyAmylostereumFungal proteinMutualism (biology)ObligateEcology

摘要: Symbiont fidelity is an important mechanism in the evolution and stability of mutualisms. Strict has been assumed for obligate mutualism between Sirex woodwasps their mutualistic Amylostereum fungi. This assumption challenged North America where European woodwasp, noctilio, its fungal mutualist, areolatum, have recently introduced. We investigate specificity species Canada, S. noctilio co-infests Pinus with native nigricornis chailletii. Using phylogenetic culture methods, we show that extensive, reciprocal exchange strains occurring, 75.3 per cent carrying A. areolatum 3.5 These findings apparent spp. associated not result specific biological mechanisms maintain symbiont fidelity. Rather, partner switching may be common when shifting geographical distributions driven by ecological or anthropogenic forces bring host mutualist pairs into sympatry. Such novel associations potentially profound consequences fitness virulence. sharing, if it occurs commonly, represent but overlooked community change linked to invasions.

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