关键词: 滇蛙, 鸣声特征, 日节律, 群鸣期

Abstract: The calls of male frogs convey information such as solicitation, warning, attack, showing off, courtship, and interspecific recognition, and play an important role in their reproduction. We collected 204 clear segments of calls and 21 days of diurnal calls of Nidirana pleuraden in Chenggong district, Kunming from May to July, 2023. The daily number of calls of N. pleuraden was significantly higher (P<0.01) in June than that in May and July. The peak calling period was 19:00 until the next day 04:00. There were no significant differences in dominant frequency and syllable duration of advertisement calls in different chorus periods, but highly significant differences in fundamental frequency, syllable interval, number of syllables, pulse rate, and call duration (P<0.01). At the peak of chorus, the pulse rate of competitive calls was lower (P<0.01), the syllable interval was higher (P<0.01), and there was no difference in the remaining five parameters. At the peak of chorus, the duration of encounter calls was lower (P<0.05), and there was no difference in the remaining six parameters. N. pleuraden had a peak breeding season in June. The calling behavior had a diurnal rhythm. The advertisement, competitive and encounter calls of N. pleuraden were affected by the intensity of chorus. N. pleuraden adjusted the advertisement call parameters during the peak of chorus, and adopted the strategy of increasing the fundamental frequency, number of syllables and duration of calls and decreasing the syllable interval and pulse rate to enhance the sexual attractiveness. The probability of winning in male-male competition was enhanced by producing competitive calls with high pulse rates and short syllable intervals, and encounter calls with longer duration.

Key words: Nidirana pleuraden, acoustic characteristics, daily circadian, chorus period