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Life stage affects prey use with fitness consequences in a zoophytophagous mirid bug

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Abstract

Omnivorous insects make foraging decisions between plant and prey resources depending on their accessibility, availability, and nutritional value. This shapes the stability and complexity of food webs, but also pest control services in agroecosystems. The mirid bug Lygus pratensis is a common cotton pest in China, but it also feeds on a variety of prey species. However, little is known about how different types of available resources affect its fitness and foraging behaviour. In laboratory experiments, we measured the fitness (survival, longevity and fecundity) of L. pratensis fed with bean pod only, bean and Aphis gossypii nymphs, or bean and Helicoverpa armigera eggs, and we also conducted focal observations of its foraging behaviour when provided the latter two. Adding H. armigera to its diet increased its fitness (both survival and fecundity), while adding A. gossypii was marginally detrimental. The different diets did not affect the time spent walking (searching for food resources) or preying, but significantly affected the time spent sapping bean tissue depending on L. pratensis life stage. Nymphs spent more time sapping plant when provided with H. armigera than A. gossypii (possibly through higher efficiency of handling prey). In addition, adults spent less time sapping plant than did nymphs (possibly through good efficiency of handling A. gossypii mobile prey and due to higher protein requirements). This special case of life-history omnivory highlights the complexity of natural food webs, where a major crop pest at the juvenile stage may become a biological control agent at the adult stage.

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Acknowledgements

We thank undergraduate students for their assistance during the experiments.

Funding

This work was supported by a grant to Pei-ling Wang, Ruo-han Ma, Jia-min Gu and Xue-ling Li from The National Key Research and Development Program of China (2017YFD0201904), and a grant to Ruo-han Ma and Zhen-xuan Xue from The Xinjiang Uygur Autonomous Region Postgraduate Research and Innovation Project (XJ2019G125).

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Pei-ling Wang and Ruo-han Ma secured the funding; Pei-ling Wang, Peng Han and Nicolas Desneux designed the study; Ruo-han Ma, Jia-min Gu, Zheng-xuan Xue and Xue-ling Li acquired the data; Ruo-han Ma and Coline C. Jaworski performed the data analysis; Ruo-han Ma, Coline C. Jaworski, Peng Han and Nicolas Desneux wrote the manuscript. All authors agreed to the publication.

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Correspondence to Pei-ling Wang or Peng Han.

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The authors declare no competing interests.

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All authors declared to have no conflicts of interests.

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Ma, Rh., Gu, Jm., Jaworski, C.C. et al. Life stage affects prey use with fitness consequences in a zoophytophagous mirid bug. Phytoparasitica 51, 503–511 (2023). https://doi.org/10.1007/s12600-023-01061-2

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  • DOI: https://doi.org/10.1007/s12600-023-01061-2

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