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Toxicity effect of the edible pigment carmoisine on Polyrhachis vicina Roger (Hymenoptera: Formicidae)

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Abstract

Carmoisine belongs to a water-soluble synthetic dye and is often used as a food additive. Previous research has shown that carmoisine is toxic to rats and zebrafish, but there have been few reports on the effect of carmoisine on soil-dwelling social insects. The present study evaluated carmoisine toxicity in Polyrhachis vicina Roger. We found that the effects of different concentrations of carmoisine on the mortality of workers were dose-dependent. The 10% lethal dose (LD10), 50% lethal dose (LD50) and 90% lethal dose (LD90) of carmoisine to workers at 96 h was calculated to be 0.504, 5.491 and 10.478 g/L, respectivily. LD10 of workers were selected to treat the fourth instar larvae, pupae and adults for 10 days. The results showed that the survival rate of all ants, except for females, was significantly reduced, especially larvae and workers. The body weight of larvae, pupae and males decreased significantly, while weight gain was observed in the females and workers. The appearance of larvae, pupae and workers changed after carmoisine treatment, such as body darkening and epidermis shrinking of larvae and pupae, as well as body segment expansion of workers. Furthermore, carmoisine altered the expression of the estrogen-related receptor, tailless and homothorax of P. vicina (Pv-ERR, Pv-tll and Pv-hth) to varying degrees in larvae and adults. We believe that variations in body weight can lead to a decrease in survival rate and appearance changes in the ants, which may be related to abnormal gene expressions caused by carmoisine treatment. Therefore, we confirm that carmoisine has negative effects on the growth and development of P. vicina.

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Data availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Authors and Affiliations

Authors

Contributions

ZL: data curation, formal analysis, methodology, resources, software, visualization, writing original draft, writing review and editing. JZ: formal analysis, investigation, software. SY: formal analysis, resources, methodology. GX: funding acquisition, methodology, project administration, writing review and editing.

Funding

This work was supported by grants from the National Natural Science Foundation of China (Grants No. 31571276 and 31171195).

Corresponding author

Correspondence to Gengsi Xi.

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The authors declare no competing interests.

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This research did not involve human subjects, so clinical trial registration is not applicable. All the authors are in agreement with the publishment.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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Li, Z., Zhang, J., Yin, S. et al. Toxicity effect of the edible pigment carmoisine on Polyrhachis vicina Roger (Hymenoptera: Formicidae). Ecotoxicology 31, 1009–1022 (2022). https://doi.org/10.1007/s10646-022-02563-1

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  • DOI: https://doi.org/10.1007/s10646-022-02563-1

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