open access

https://hdl.handle.net/2115/72068

Growth rate adjustment of two Drosophila parasitoids in response to the developmental stage of hosts

英語

life-history strategy

2017-12

John Wiley & Sons

Ecological entomology

42(6)

785-792

1. Generalist koinobiont parasitoids often exhibit high flexibility in their development; their larvae shorten or prolong the developmental period depending on the host quality at parasitisation. However, flexibility of the growth rate of parasitoid larvae has rarely been investigated so far. 2. This study investigated how the koinobiont parasitoid wasps Asobara japonica and Leptopilina ryukyuensis regulate their larval growth when they parasitise host Drosophila larvae with varying larval periods. 3. In both parasitoid species, the preimaginal period was longer when they parasitised 1-day-old larvae of Drosophila rufa than when they parasitised older larvae of D. rufa or when they parasitised larvae of Drosophila simulans, a species with a shorter larval period than D. rufa. After host pupariation, A. japonica accelerated its growth, thereby showing a biphasic growth curve. On the other hand, L. ryukyuensis did not accelerate its growth after host pupariation. 4. Growth retardation of parasitoid larvae in 1-day-old D. rufa larvae would contribute to avoiding excess growth before host pupariation, because the excess growth of parasitoid larvae would have negative effects on host growth. The growth rate acceleration of A. japonica after host pupariation suggests that they enhance resource utilisation in a host that has reached maximum body mass. It remains uncertain as to why L. ryukuensis does not show clear accelerated growth after host pupariation. Nonetheless, these results suggest that parasitoid larvae have the ability to detect the developmental stage of hosts in a species-specific manner.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: http://onlinelibrary.wiley.com/doi/10.1111/een.12444/abstract;jsessionid=8B1163E4F20D342CCD6A90D6B471B69D.f04t04, which has been published in final form at 10.1111/een.12444. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

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