Fitness costs of symbiont switching using entomopathogenic nematodes as a model
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Univ Arizona, Sch Anim & Comparat Biomed SciUniv Arizona, Ctr Insect Sci
Univ Arizona, Dept Entomol
Issue Date
2017-04-17
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BIOMED CENTRAL LTDCitation
Fitness costs of symbiont switching using entomopathogenic nematodes as a model 2017, 17 (1) BMC Evolutionary BiologyJournal
BMC Evolutionary BiologyRights
© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Background: Steinernematid nematodes form obligate symbioses with bacteria from the genus Xenorhabdus. Together Steinernema nematodes and their bacterial symbionts successfully infect, kill, utilize, and exit their insect hosts. During this process the nematodes and bacteria disassociate requiring them to re-associate before emerging from the host. This interaction can be complicated when two different nematodes co-infect an insect host. Results: Non-cognate nematode-bacteria pairings result in reductions for multiple measures of success, including total progeny production and virulence. Additionally, nematode infective juveniles carry fewer bacterial cells when colonized by a non-cognate symbiont. Finally, we show that Steinernema nematodes can distinguish heterospecific and some conspecific non-cognate symbionts in behavioral choice assays. Conclusions: Steinernema-Xenorhabdus symbioses are tightly governed by partner recognition and fidelity. Association with non-cognates resulted in decreased fitness, virulence, and bacterial carriage of the nematode-bacterial pairings. Entomopathogenic nematodes and their bacterial symbionts are a useful, tractable, and reliable model for testing hypotheses regarding the evolution, maintenance, persistence, and fate of mutualisms.ISSN
1471-2148PubMed ID
28412935Version
Final published versionSponsors
National Science Foundation [IOS-0919565, IOS-0920631]; Graduate and Professional Student Council Grant (University of Arizona); Howard Hughes Medical Institute grant [52006942]; NIH IRACDA K-12 [5K12GM000708-17]ae974a485f413a2113503eed53cd6c53
10.1186/s12862-017-0939-6
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