Abstract
Bathyplectes anurus, a parasitoid of the alfalfa weevils, forms a cocoon in the late larval stage and exhibits jumping behaviour. Adaptive significance and costs of the cocoon jumping have not been thoroughly studied. We hypothesised that jumping has the fitness benefits of enabling habitat selection by avoiding unfavourable environments. We conducted laboratory experiments, which demonstrated that jumping frequencies increased in the presence of light, with greater magnitudes of temperature increase and at lower relative humidity. In addition, when B. anurus individuals were allowed to freely jump in an arena with a light gradient, more cocoons were found in the shady area, suggesting microhabitat selection. In a field experiment, mortality of cocoons placed in the sun was significantly higher than for cocoons placed in the shade. B. anurus cocoons respond to environmental stress by jumping, resulting in habitat selection. In the presence of potential predators (ants), jumping frequencies were higher than in the control (no ant) arenas, though jumping frequencies decreased after direct contact with the predators. Body mass of B. anurus cocoons induced to jump significantly decreased over time than cocoons that did not jump, suggesting a cost to jumping. We discuss the benefits and costs of jumping behaviour and potential evolutionary advantages of this peculiar trait, which is present in a limited number of species.
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Acknowledgments
We are indebted to four anonymous reviewers and M. Hart for their valuable and constructive suggestions. This study was supported by a Grant-in-Aid from JSPS (KAKENHI 22570215, 23405008 and 25430194) and by Kyushu University Interdisciplinary Programs in Education and Projects in Research Development (25412) to M. Tuda.
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Saeki, Y., Tani, S., Fukuda, K. et al. Costs and benefits of larval jumping behaviour of Bathyplectes anurus . Sci Nat 103, 1 (2016). https://doi.org/10.1007/s00114-015-1324-1
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DOI: https://doi.org/10.1007/s00114-015-1324-1