Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-33743
Castaneda, L E; Sandrock, C; Vorburger, C (2010). Variation and covariation of life history traits in aphids are related to infection with the facultative bacterialendosymbiont Hamiltonella defensa. Biological Journal of the Linnean Society, 100(1):237-247.
Host–symbiont associations play an important role in insects. In aphids, facultative symbionts affect host plant use and increase thermal tolerance and resistance to natural enemies. In spite of these beneficial effects on aphid fitness, the frequency of facultative symbionts in aphids ranges from low to intermediate. Tradeoffs induced by
symbionts could prevent the fixation of symbionts in aphid populations. Therefore, we studied the life history traits
and correlations between them in 21 clones of the black bean aphid, Aphis fabae, seven of which were infected with
the facultative endosymbiont Hamiltonella defensa. We found that clones harbouring H. defensa exhibited significantly higher body mass at maturity and offspring production, and a marginally higher intrinsic rate of increase. However, development time and offspring body size did not differ between symbiont-free and infected clones. In addition, body mass at maturity was positively correlated with offspring production, offspring body size and intrinsic rate of increase, whereas development time was negatively correlated with body mass at maturity, offspring production and offspring body size. Excluding infected clones had little effect on these correlations; only correlations between body mass at maturity and offspring production, and between development time and offspring body size, became nonsignificant. Therefore, we did not find any evidence for tradeoffs between life history traits induced by symbiont infection. In fact, infected clones had higher overall fitness than symbiont-free clones under the conditions of our experiment, suggesting that symbionts do not impose costs on aphids harbouring them.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies|
|DDC:||570 Life sciences; biology|
590 Animals (Zoology)
|Uncontrolled Keywords:||Aphis fabae – black bean aphid – costs – fitness – secondary symbiont – symbiosis – tradeoff|
|Deposited On:||17 May 2010 14:15|
|Last Modified:||23 Nov 2012 16:56|
|Additional Information:||The definitive version is available at www.blackwell-synergy.com|
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