Volume 44 Issue 5
Sep.  2023
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Peng-Xiang Duan, Zhi-Tao Wang, Tomonari Akamatsu, Nick Tregenza, Guang-Yu Li, Ke-Xiong Wang, Ding Wang. Anthropogenic activity, hydrological regime, and light level jointly influence temporal patterns in biosonar activity of the Yangtze finless porpoise at the junction of the Yangtze River and Poyang Lake, China. Zoological Research, 2023, 44(5): 919-931. doi: 10.24272/j.issn.2095-8137.2022.504
Citation: Peng-Xiang Duan, Zhi-Tao Wang, Tomonari Akamatsu, Nick Tregenza, Guang-Yu Li, Ke-Xiong Wang, Ding Wang. Anthropogenic activity, hydrological regime, and light level jointly influence temporal patterns in biosonar activity of the Yangtze finless porpoise at the junction of the Yangtze River and Poyang Lake, China. Zoological Research, 2023, 44(5): 919-931. doi: 10.24272/j.issn.2095-8137.2022.504

Anthropogenic activity, hydrological regime, and light level jointly influence temporal patterns in biosonar activity of the Yangtze finless porpoise at the junction of the Yangtze River and Poyang Lake, China

doi: 10.24272/j.issn.2095-8137.2022.504
Supplementary data to this article can be found online.
The authors declare that they have no competing interests.
Z.T.W. and K.X.W. contributed to project conception. Z.T.W. contributed to funding acquisition. P.X.D. and Z.T.W. conducted the experiments. P.X.D., Z.T.W., T.A., and N.T. analyzed the data and prepared the figures and manuscript. Z.T.W., T.A., N.T., G.Y.L, K.X.W., and D.W. provided technical support. All authors read and approved the final version of the manuscript.
Funds:  This work was supported by Science and Technology Service Network Initiative Program of the Chinese Academy of Sciences,the National Natural Science Foundation of China (41806197) and the Exploratory Program of the Natural Science Foundation of Zhejiang Province (ZX2023000154).
More Information
  • Under increasing anthropogenic pressure, species with a previously contiguous distribution across their ranges have been reduced to small fragmented populations. The critically endangered Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis), once commonly observed in the Yangtze River-Poyang Lake junction, is now rarely seen in the river-lake corridor. In this study, static passive acoustic monitoring techniques were used to detect the biosonar activities of the Yangtze finless porpoise in this unique corridor. Generalized linear models were used to examine the correlation between these activities and anthropogenic impacts from the COVID-19 pandemic lockdown and boat navigation, as well as environmental variables, including hydrological conditions and light levels. Over approximately three consecutive years of monitoring (2020–2022), porpoise biosonar was detected during 93% of logged days, indicating the key role of the corridor for finless porpoise conservation. In addition, porpoise clicks were recorded in 3.80% of minutes, while feeding correlated buzzes were detected in 1.23% of minutes, suggesting the potential existence of localized, small-scale migration. Furthermore, both anthropogenic and environmental variables were significantly correlated with the diel, lunar, monthly, seasonal, and annual variations in porpoise biosonar activities. During the pandemic lockdown period, porpoise sonar detection showed a significant increase. Furthermore, a significant negative correlation was identified between the detection of porpoise click trains and buzzes and boat traffic intensity. In addition to water level and flux, daylight and moonlight exhibited significant correlations with porpoise biosonar activities, with markedly higher detections at night and quarter moon periods. Ensuring the spatiotemporal reduction of anthropogenic activities, implementing vessel speed restrictions (e.g., during porpoise migration and feeding), and maintaining local natural hydrological regimes are critical factors for sustaining porpoise population viability.
  • Supplementary data to this article can be found online.
    The authors declare that they have no competing interests.
    Z.T.W. and K.X.W. contributed to project conception. Z.T.W. contributed to funding acquisition. P.X.D. and Z.T.W. conducted the experiments. P.X.D., Z.T.W., T.A., and N.T. analyzed the data and prepared the figures and manuscript. Z.T.W., T.A., N.T., G.Y.L, K.X.W., and D.W. provided technical support. All authors read and approved the final version of the manuscript.
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