Skip to Main content Skip to Navigation
Journal articles

Impact of water-deficit stress on tritrophic interactions in a wheat-aphid-parasitoid system.

Abstract : Increasing temperature and CO2 concentrations can alter tritrophic interactions in ecosystems, but the impact of increasingly severe drought on such interactions is not well understood. We examined the response of a wheat-aphid-parasitoid system to variation in water-deficit stress levels. Our results showed that arid area clones of the aphid, Sitobion avenae (Fabricius), tended to have longer developmental times compared to semiarid and moist area clones, and the development of S. avenae clones tended to be slower with increasing levels of water-deficit. Body sizes of S. avenae clones from all areas decreased with increasing water-deficit levels, indicating their declining adaptation potential under drought. Compared to arid area clones, moist area clones of S. avenae had a higher frequency of backing under severe water stress only, but a higher frequency of kicking under well-watered conditions only, suggesting a water-deficit level dependent pattern of resistance against the parasitoid, Aphidius gifuensis (Ashmead). The number of S. avenae individuals attacked by the parasitoid in 10 min showed a tendency to decrease with increasing water-deficit levels. Clones of S. avenae tended to have lower parasitism rates under treatments with higher water-deficit levels. The development of the parasitoid tended to be slower under higher levels of water-deficit stress. Thus, the bottom-up effects of water-deficit stressed plants were negative on S. avenae. However, the top-down effects via parasitoids were compromised by water-deficit, which could favor the growth of aphid populations. Overall, the first trophic level under water-deficit stress was shown to have an indirect and negative impact on the third trophic level parasitoid, suggesting that parasitoids could be increasingly vulnerable in future warming scenarios.
Document type :
Journal articles
Complete list of metadata

Cited literature [56 references]  Display  Hide  Download

https://hal.inrae.fr/hal-02628785
Contributor : Migration Prodinra Connect in order to contact the contributor
Submitted on : Tuesday, May 26, 2020 - 11:52:09 PM
Last modification on : Wednesday, November 3, 2021 - 4:13:12 AM

File

2017_Ahmed_Plos One_1.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Citation

Syed Suhail Ahmed, Deguang Liu, Jean-Christophe Simon. Impact of water-deficit stress on tritrophic interactions in a wheat-aphid-parasitoid system.. PLoS ONE, Public Library of Science, 2017, 12 (10), ⟨10.1371/journal.pone.0186599⟩. ⟨hal-02628785⟩

Share

Metrics

Record views

42

Files downloads

76