Abstract
Group-living animals sometimes cooperatively protect their offspring against predators. This behavior is observed in a wide range of taxa but, to the best of our knowledge, this is the first report of its occurrence in arthropods that are not eusocial. Adult female predatory mites Gynaeseius liturivorus protect their eggs against egg predators, the predatory mite species Neoseiulus californicus. In the field, several adult female G. liturivorus were often found on the same plant structures such as folded leaves. We tested whether these females might protect their eggs cooperatively, focusing on kinship between the females. When two adult female G. liturivorus were kept in the absence of egg predators, their reproduction was not affected by their kinship. The presence of egg predators reduced the number of G. liturivorus eggs. However, reproduction of two G. liturivorus sisters was higher than that of two non-sisters. Together, sisters guarded the oviposition site longer than non-sisters. We further tested if non-sisters increased egg guarding by having developed together from eggs to adults and found no such effect. Although it remains unclear how adult female G. liturivorus recognize conspecifics as kin or sisters, our results suggest that G. liturivorus sisters reduced predation on their offspring by cooperatively guarding their eggs.
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We thank Ian Hardy and one anonymous reviewer for their valuable comments.
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This work was supported by the Japan Society for Promotion of Science (Basic Research C; grant number 19K06849 to YC).
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YC and AJ designed the experiments and wrote the ms. YC performed the experiments and AJ analyzed the data.
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Communicated by Liliane Ruess.
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Choh, Y., Janssen, A. Sister predatory mites collectively protect their eggs against predators. Oecologia 204, 653–660 (2024). https://doi.org/10.1007/s00442-024-05521-2
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DOI: https://doi.org/10.1007/s00442-024-05521-2