Oviposition strategy for superparasitism in the gregarious parasitoid Oomyzus sokolowskii (Hymenoptera: Eulophidae)

作者

Li, X; Li, B; Meng, L;

期刊:BULLETIN OF ENTOMOLOGICAL RESEARCH ISSN:0007-4853 , 年:2019 . 卷:109 . 期:2 页码:221-228

语种: English

原文链接:http://dx.doi.org/10.1017/S0007485318000445

摘要

Superparasitism is an adaptive strategy in solitary parasitoids, yet insufficient evidence confirms this in gregarious ones. We here ask whether the gregarious parasitoid Oomyzus sokolowskii is able to discriminate in attack and progeny allocation between parasitized and unparasitized Plutella xylostella larvae, and how the parasitoid allocates brood size and sex to superparasitized hosts due to some circumstances. We found that female parasitoids preferred unparasitized to parasitized host larvae, and allocated a smaller brood with more males in the later than in the former host. Brood size and sex ratio decreased from superparasitized hosts with a 48 h interval since a previous attack compared with one without an interval; they also declined from the host superparasitized by the parasitoid with oviposition experience compared with one without it. Brood size and sex ratio did not differ between the host superparasitized by the same parasitoid as in the first attack and that by a different one. Our findings suggest that O. sokolowskii females may adjust their oviposition decisions on progeny allocation in response to parasitized P. xylostella larvae to maximize their fitness gains from superparasitism.

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关键词
brood size; host discrimination; learning; Plutella xylostella; progeny allocation; sex ratio; oviposition strategy

附加关键词:
LOCAL MATE COMPETITION; PLUTELLA-XYLOSTELLA LEPIDOPTERA; PATCH TIME ALLOCATION; LEPTOPILINA-HETEROTOMA HYMENOPTERA; WASP NASONIA-VITRIPENNIS; SEX-RATIO; CLUTCH SIZE; ADAPTIVE SUPERPARASITISM; SOLITARY PARASITOIDS; DIAMONDBACK MOTH

作者信息

通讯作者:
     Meng, L , Nanjing Agr Univ, Sch Plant Protect, Nanjing 210095, Jiangsu, Peoples R China.
作者机构:
     [1] [ Li, X.; Li, B.; Meng, L. ] Nanjing Agr Univ, Sch Plant Protect, Nanjing 210095, Jiangsu, Peoples R China.
     [2] [ Li, X. ] Shanxi Agr Univ, Coll Agr, Taigu 030801, Shanxi, Peoples R China.
作者邮箱:
     ml@njau.edu.cn