首页|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

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

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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.

Yangtze finless porpoisesYangtze RiverPoyang LakePandemic lockdownBoat trafficHydrological regimeLight level

Peng-Xiang Duan、Zhi-Tao Wang、Tomonari Akamatsu、Nick Tregenza、Guang-Yu Li、Ke-Xiong Wang、Ding Wang

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College of Fisheries,Huazhong Agricultural University,Wuhan,Hubei 430070,China

Key Laboratory of Aquatic Biodiversity and Conservation,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan,Hubei 430072,China

School of Marine Science,Ningbo University,Ningbo,Zhejiang 315832,China

Ocean Policy Research Institute,Sasakawa Peace Foundation,Minato-ku,Tokyo 105-8524,Japan

Chelonia Limited,The Barkhouse,North Cliff,Mousehole TR196PH,UK

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Science and Technology Service Network Initiative Program of the Chinese Academy of SciencesNational Natural Science Foundation of ChinaExploratory Program of the Natural Science Foundation of Zhejiang Province

41806197ZX2023000154

2023

10.24272/j.issn.2095-8137.2022.504

动物学研究
中国科学院昆明动物研究所 中国动物学会

动物学研究

CSTPCDCSCD
影响因子：0.582
ISSN：0254-5853
年,卷(期)：2023.44(5)
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