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Fungal symbiont of firebrats (Thysanura) induces arrestment behaviour of firebrats and giant silverfish but not common silverfish

Published online by Cambridge University Press:  25 July 2013

Nathan Woodbury  and
Gerhard Gries
Nathan Woodbury
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
Gerhard Gries*
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
*
1Corresponding author (e-mail: [email protected]).
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Abstract

We have recently shown that firebrats, Thermobia domestica (Packard) (Thysanura: Lepismatidae), carry, and deposit with their faeces, the symbiotic bacterium Enterobacter cloacae (Jordan 1890) Hormaeche and Edwards 1960 (Enterobacteriaceae) and the symbiotic fungus Mycotypha microspora Fenner, 1932 (Mycotyphaceae), and that these microbes induce arrestment behaviour and aggregation of firebrats. Here, we tested whether giant silverfish, Ctenolepisma longicaudata Escherich (Thysanura: Lepismatidae), and common silverfish, Lepisma saccharina (Linnaeus) (Thysanura: Lepismatidae), also arrest in response to these two microbes. In dual-choice bioassays, E. cloacae arrested firebrats but not giant silverfish or common silverfish, whereas M. microspora arrested firebrats and giant silverfish but not common silverfish. As close relatives, firebrats and giant silverfish have similar microclimate and nutrient requirements and may use M. microspora as the same aggregation cue when they aggregate in hot and humid microclimates where M. microspora proliferates and breaks down cellulose. As a more distant relative to firebrats and giant silverfish, common silverfish seem to require a different as yet unknown aggregation cue or signal, possibly one that is indicative of the type of microclimate (room temperature; high humidity) they prefer.

Résumé

Nous avons démontré récemment que les thermobies, Thermobia domestica (Packard) (Thysanura: Lepismatidae), portent et déposent dans leurs fèces la bactérie symbiotique Enterobacter cloacae (Jordan 1890) Hormaeche et Edwards 1960 (Enterobacteriaceae) et le champignon symbiotique Mycotypha microspora Fenner 1932 (Mycotyphaceae) et que ces microorganismes provoquent un comportement d'arrêt sur place et d'attroupement chez les thermobies. Nous vérifions maintenant si le poisson d'argent géant, Ctenolepisma longicaudata Escherich (Thysanura: Lepismatidae), et le poisson d'argent commun, Lepisma saccharina (Linnaeus) (Thysanura: Lepismatidae), s'arrêtent aussi en présence de ces deux microorganismes. Dans des essais à deux choix, E. cloacae provoque l'arrêt sur place des thermobies, mais non des poissons d'argent géants ni des poissons d'argent communs, alors que M. microspora provoque l'arrêt des thermobies et des poissons d'argent géants, mais non des poissons d'argent communs. Les thermobies et les poissons d'argent géants, qui sont proches parents, possèdent des besoins semblables en microclimat et en nourriture et peuvent ainsi utiliser M. microspora comme signal commun lorsqu'ils se rassemblent dans les microclimats chauds et humides dans lesquels M. microspora prolifère et décompose de la cellulose. Étant des parents plus éloignés des thermobies et des poissons d'argent géants, les poissons d'argent communs semblent nécessiter un signal ou indicateur de rassemblement différent et encore non identifié, possiblement un qui indique le type de microclimat qu'ils préfèrent (température de la pièce, humidité élevée).

Type
Behaviour & Ecology – NOTE
Information
The Canadian Entomologist , Volume 145 , Issue 5 , October 2013 , pp. 543 - 546
Copyright
Copyright © Entomological Society of Canada 2013 

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