| 초록 |
The nest-relief calls of the Kentish plover (Charadrius alexandrinus) during incubation period were recorded and classified based on structural difference and its usage. Ten nests were videotaped at two breeding sites on the west coast of Korea during the incubation period of two hours per day from May to July 2014 and 2020. We selected and analyzed total 166 nest-relief calls uttered by members of 10 pairs during the incubation, where we found four call types: call type A ('tit'), B ('pee'), B-long ('PEEjurrr'), and C ('rrooh’). Call type C was most often used as an initiating signal when they take turns of incubation, where approaching and responding males mainly used the call type C, while responding females mostly used both call type A and C and approaching females used type B-long and C. In this study, we found that call type C was used as threat calls reported from a previous study as well as main nest-relief calls in this study. In addition, females used more various types of calls than males and approaching individuals mainly gave call first to the member of the pair in nests. However, we do not know why the four types of calls were used in nest-relief situations and why females used more various types of calls in Kentish plovers. Thus, we need more detailed studies to reveal the function of the calls. |
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