Addition of nectar sources affects a parasitoid community without improving pest suppression
- PDF / 1,170,193 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 117 Downloads / 167 Views
ORIGINAL PAPER
Addition of nectar sources affects a parasitoid community without improving pest suppression Jacob H. Miall1,2 · Paul K. Abram3 · Naomi Cappuccino1 · Andrew M. R. Bennett2 · José L. Fernández‑Triana2 · Gary A. P. Gibson4 · Peter G. Mason2 Received: 21 February 2020 / Revised: 3 August 2020 / Accepted: 21 August 2020 © The Author(s) 2020
Abstract A life-table approach was used to test the effect of adding flowering buckwheat to leek plots on mortality and estimated population growth of the invasive leek moth, Acrolepiopsis assectella. This approach was used to estimate the benefits of nectar provisioning on multiple members of the leek moth’s parasitoid complex, and the impact of parasitism on the pest’s predicted population growth rate. Addition of buckwheat to leek plots shifted the relative abundance of different larval and pupal parasitoid species but did not increase or decrease parasitism levels or their population-level impact on the leek moth. The life-table analysis demonstrated that parasitoids reduced the estimated population growth rate of the leek moth by up to 72%, which far exceeds similar estimates from its native range. Parasitoids found to contribute to leek moth mortality were Itoplectis conquisitor, Conura albifrons and the biological control agent Diadromus pulchellus. In addition, Gambrus ultimus, Scambus calobatus, and Habrobracon sp. are reported here developing on A. assectella for the first time. This study reinforces the hypothesis that the addition of nectar resources to agricultural systems may not have straightforward positive effects and can favour some natural enemies over others, but may not have any overall impact on pest suppression. Keywords Conservation biological control · Diadromus pulchellus · Facultative hyperparasitism · Life tables · Floral resources
Key Message
Communicated by V. Gagic .
• In North America, the invasive leek moth (Acrolepiopsis
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10340-020-01274-y) contains supplementary material, which is available to authorized users.
•
* Jacob H. Miall [email protected]
•
1
Department of Biology, Carleton University, 1125 Colonel By Drive, Ottawa, ON K1S 5B6, Canada
2
Agriculture and Agri‑Food Canada, Ottawa Research and Development Centre, 960 Carling Avenue, Ottawa, ON K1A 06C, Canada
3
Agriculture and Agri‑Food Canada, Agassiz Research and Development Centre, 6947 Highway 7, Agassiz, BC V0M 1A0, Canada
4
Honorary Research Associate, Agriculture and Agri‑Food Canada, Ottawa Research and Development Centre, 960 Carling Avenue, Ottawa, ON K1A 06C, Canada
• •
assectella) is attacked by indigenous parasitoids and an introduced biological control agent. A life-table study measured the effects of nectar-provisioning on mortality and parasitism of leek moth in the field. Overall, parasitism significantly reduced leek moth populations. Adding flowering buckwheat shifted the relative abundance of larval and pupal parasitoid sp
Data Loading...
