Abstract
In bi-parental species, breeding pairs cooperate to regulate incubation duration through nest-relief behavior, using vocal signals to communicate when exchanging incubation duties. To better understand this behavior, two important questions are (1) which vocalizations are mainly used with nest-relief behavior and (2) which parent initiates nest relief using these vocal signals. In this study, we examined the vocalizations and behaviors of incubating pairs of Kentish plovers (Charadrius alexandrinus). We categorized nest-relief calls and investigated the major call types used when initiating nest relief and when the partner responded and analyzed the number of initiating calls by sex and behavioral role (relieving or incubating). We observed that they used four call types: type A (“tit”), type B (“pee”), type B-long (“PEEjurrr”), and type C (“rrooh”). Call type C, which is known as an agonistic call, was the most used nest-relief call. Additionally, we found that relieving individuals produced initiating calls more frequently than incubating individuals, but there were no sex differences. These results suggest that Kentish plovers make use of specific call types during nest relief, and we discuss the possibility of relationships between nest-relief calls and coordinative behavior when dividing labor in a parental pair.
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Data availability statement
The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We appreciate the anonymous reviewers for their detailed comments. We thank Saemangeum Project Office and Korea Rural Community Corporation for permission to collect data in the field and are grateful to the laboratory members of the Eco-Behav lab at Chonnam National University for their helpful assistance in this study. We also thank Dong-Geun Lee for providing Kentish plover drawings.
Funding
This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government [NRF-2019R1F1A1061024].
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No approval of any research ethics committees was required to accomplish the goals of this study because only observational work was conducted with an unregulated vertebrate species. We collected all data in compliance with the current laws of South Korea and did not capture any birds.
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Lee, DY., Lee, JH., Kim, WY. et al. Nest-relief behaviors and usage of call types in the Kentish plover (Charadrius alexandrinus). J Ethol 41, 231–241 (2023). https://doi.org/10.1007/s10164-023-00792-3
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DOI: https://doi.org/10.1007/s10164-023-00792-3