Preliminary analysis of vocalization patterns and influencing factors of cetaceans in the Beibu Gulf
Received date: 2025-06-19
Accepted date: 2025-11-11
Online published: 2025-12-03
Based on the 113-day acoustic data measured in the Beibu Gulf, this paper uses an automatic detection method to detect the click signals of cetaceans in the data, counts the number of signals, and obtains the vocalization patterns of cetaceans during the observation period. Statistical analysis of the number of click signals of cetaceans during the observation period shows that the number of clicks of cetaceans is less in late winter and more in early spring. During the day, it is less and at night, it is more. The influence of hydrological and meteorological factors on the number of click signals of cetaceans during the observation period is analyzed. It is found that the number of click signals of cetaceans is less in late winter and more in early spring. The correlation between sea surface temperature, wind speed, and rain fall and the number of click signals of cetaceans is not obvious, the low-frequency environmental noise is calculated, and it is found that the noise level is high during the day and low at night, which is inversely proportional to the number of click signals of cetaceans during the day and night. This is considered to be caused by the difference in ship noise between day and night. The situation of ship noise during the observation period is analyzed, and it is found that cetaceans’ click signals are affected by ships. When ship noise occurs, cetaceans do not vocalize or have fewer vocalizations. Thus, it is concluded that cetaceans have a certain avoidance phenomenon towards ships.
Key words： Cetaceans; Click signals; Frequency of vocalization; Influencing factors
Zongwei LIU , Ping ZHAO , Dezheng GAO , Ying JIANG , Bingyao CHEN , Zhichao LYU , Liangang LYU . Preliminary analysis of vocalization patterns and influencing factors of cetaceans in the Beibu Gulf[J]. ACTA THERIOLOGICA SINICA, 2025 , 45(6) : 831 -841 . DOI: 10.16829/j.slxb.151112
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