UZH-Logo

Variation and covariation of life history traits in aphids are related to infection with the facultative bacterialendosymbiont Hamiltonella defensa


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.

Abstract

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.

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.

Citations

10 citations in Web of Science®
10 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

69 downloads since deposited on 17 May 2010
15 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Uncontrolled Keywords:Aphis fabae – black bean aphid – costs – fitness – secondary symbiont – symbiosis – tradeoff
Language:English
Date:2010
Deposited On:17 May 2010 12:15
Last Modified:05 Apr 2016 14:06
Publisher:Wiley-Blackwell
ISSN:0024-4066
Additional Information:The definitive version is available at www.blackwell-synergy.com
Publisher DOI:10.1111/j.1095-8312.2010.01416.x
Permanent URL: http://doi.org/10.5167/uzh-33743

Download

[img]
Preview
Content: Accepted Version
Filetype: PDF
Size: 1MB
View at publisher

TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.

Author Collaborations