Abstract
Insects are exposed to cadmium stress since cadmium pollution has increasingly become a serious global environmental issue. However, until now few studies have paid attention to the effect of heavy metals on insect reproductive behaviors. In our study, the courtship behaviors, mating behaviors and fecundity of beet armyworm Spodoptera exigua (Lepidoptera: Noctuidae) exposed to different concentrations of cadmium in artificial diets at larval stage were studied. The results showed that cadmium stress changed the courtship rhythm by significantly advancing or delaying the courtship starting time. Low dose of cadmium (0.2 mg/kg) increased the courtship frequency in the first two scotophases, but in the fourth phase, the two cadmium treatments reduced the frequency. The total courtship duration was significantly shortened in the first six scotophases except high dose of cadmium treatment (51.2 mg/kg) in the sixth dark phase. Paired adults did not mate after the seventh scotophase under low cadmium exposure, while high cadmium stress made the paired adults just copulate in the first four scotophases. The daily mating rate and total mating rate decreased with the increase in cadmium concentration. The number of eggs of low cadmium treatment was higher than that of control, but the difference was not significant; the number of eggs in high cadmium treatment was lower than that of control and low cadmium treatment. Our results indicate that cadmium exposure can disrupt the courtship rhythm for females and has negative influences on copulation behavior and high cadmium stress can reduce fecundity. Hence, the insect population increase will be affected by heavy metal pollution. Our study will provide scientific reference for environmental risk assessment of heavy metal pollution.
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Acknowledgements
We thank Jeannie McDonald (Ecology and Evolutionary Biology Department, Cornell University, NY, USA) very much for her contribution to the manuscript revision.
Funding
This study was funded by the National Science and Technology Major Project, China (2016ZX08012-004-010) and (2019ZX08012-004-010).
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Conceptualization: HS, methodology: ZY, ZZ, YC, formal analysis and investigation: JW, ZY, ZZ, writing—original draft preparation: JW, HS, ZY, ZZ; writing—review and editing: HS, JW, funding acquisition: YY, supervision: YY.
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Su, H., Wu, J., Zhang, Z. et al. Effects of cadmium stress at different concentrations on the reproductive behaviors of beet armyworm Spodoptera exigua (Hübner). Ecotoxicology 30, 402–410 (2021). https://doi.org/10.1007/s10646-021-02365-x
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DOI: https://doi.org/10.1007/s10646-021-02365-x