Spatial–temporal variations in biosonar activity of Yangtze finless porpoise in the lower reaches of the Yangtze River and its correlation with underwater noise: Are quieter non‐shipping branches the remaining shelters?

Lu, Zhengxin; Xu, Chen; Duan, Peng‐Xiang; Wang, Ding; Wang, Zhitao; Wang, Ke‐Xiong

doi:10.1002/aqc.3535

Cited by 9 publications

(7 citation statements)

References 70 publications

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“…Shipping and sand mining are the main human disturbance factors in Poyang Lake, which therefore need careful analysis (Nabi et al, 2018). Surveys carried out by Wei et al (2003) showed that the maximum number of Yangtze River have shown that the biosonar signals of porpoises in non-shipping channels are much higher than in the shipping channel (Zhou et al, 2021). The present study found that the main shipping channel in Poyang Lake coincided with the core habitat of the porpoise, especially during the dry season.…”

Section: Seasonal Differences In Habitat Configurationmentioning

confidence: 46%

“…Surveys carried out by Wei et al (2003) showed that the maximum number of porpoise sightings occurred in an area within a distance of 200–350 m from boats in the Yangtze River, and Kimura et al (2012) concluded that ship traffic and sand mining operations do not seem to have a significant effect on the presence of porpoises. Observations in the Yangtze River have shown that the biosonar signals of porpoises in non‐shipping channels are much higher than in the shipping channel (Zhou et al, 2021). The present study found that the main shipping channel in Poyang Lake coincided with the core habitat of the porpoise, especially during the dry season.…”

Section: Discussionmentioning

confidence: 99%

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Identifying the seasonal characteristics of likely habitats for the Yangtze finless porpoise in Poyang Lake

Lai

Liu

et al. 2022

Aquatic Conservation

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The Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis) has experienced significant decline and habitat degradation in recent decades. At present, nearly half of the total population inhabits Poyang Lake. The hydrological seasonality of the lake significantly influences porpoise habitat configuration, which brings problems for conservation in the delineation of reserve design and the management of human activities. A hydrodynamic model was used to distinguish the different hydrological conditions between the flood and dry seasons. The MaxEnt model was used to investigate the major environmental variables affecting porpoise distribution and delineate likely habitats of the porpoise under different hydrological conditions. The effectiveness of the present nature reserve was evaluated based on these results. Flow velocity and distance to fish spawning grounds were the primary variables influencing porpoise distribution during the dry season. Water depth, flow velocity and the distance to bank were the major variables during the flood season. The likely habitats were distributed discontinuously along the main channel during the dry season, with a total area of 112 km2. During the flood season, the habitats extended into the central areas of the lake and tributaries with a total area of 628 km2. At present, the nature reserve covers 4% and 18% of the likely core habitats during dry and flood seasons. An ideal nature reserve should be designed as an integrative network with reference to the seasonality of likely habitat distribution and major environmental variables. The habitats in conditions of extreme low water should be strictly protected in the dry season. Enhanced survey efforts, long‐term hydrodynamic modelling and species distribution modelling can greatly assist in understanding habitat configuration and changing processes for other freshwater cetaceans inhabiting river–lake systems. Future planning to improve protection should consider habitat characteristics under the shifting hydrological conditions caused by climate change or artificial flow alteration.

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Section: Seasonal Differences In Habitat Configurationmentioning

confidence: 46%

Section: Discussionmentioning

confidence: 99%

Identifying the seasonal characteristics of likely habitats for the Yangtze finless porpoise in Poyang Lake

Lai

Liu

et al. 2022

Aquatic Conservation

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“…However, information on the seasonal and diurnal activities of finless porpoises between habitat types, comparing natural with anthropogenically disturbed, is largely lacking. Using PAM to compare porpoise activities in this way, Zhou et al (2021) concluded that shipping closures on some branches of the Yangtze River would be necessary to provide refuges for the Yangtze finless porpoise.…”

Section: Introductionmentioning

confidence: 99%

“…PAM has been used to monitor the distribution of cetaceans in a variety of habitats and to inform fine‐scale habitat use (Dähne et al, 2013; Thompson et al, 2013; Wilson, Benjamins & Elliott, 2013; Fang et al, 2020). For areas prone to intense human activities where animal occurrence and activity may be low, the PAM technique may help explain how human impacts influence the habitat use of cetaceans (Wang et al, 2014; Wang et al, 2015; Zhou et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and diel activities of the Yangtze finless porpoise in natural and highly disturbed habitats: Implications for conservation planning of freshwater cetaceans

Chen

Wang

et al. 2022

Aquatic Conservation

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1. Knowledge of fine-scale seasonal and diel activity patterns of animals provides insights into habitat utilization dynamics and informs conservation action planning against potential human impacts. Such information is particularly important for riverine cetaceans, such as the Yangtze finless porpoise, which is threatened by habitat loss and disturbances by a variety of human activities.2. Passive acoustic monitoring (PAM) techniques were used to survey the seasonal and diel activities of the Yangtze finless porpoise in two natural habitat patches of the Anqing Yangtze Finless Porpoise Natural Reserve, and in one highly disturbed area adjacent to the reserve.3. In the two natural habitat patches, significantly higher detection rates of porpoises were observed during autumn and winter. The detection rates during

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“…SoundTrap HF300 has been used to record different types of clicks of Yangtze finless porpoises (Zhou et al, 2021) and to record the vocal frequencies of Yangtze finless porpoises in open water and captive environments (Serres et al, 2021). Therefore, the detection results of ST can be used as references to compare the effectiveness of RPCD-II for the detection of Yangtze finless porpoises, through which we can further infer the potential of the homemade system to be applied in other porpoises emitting NBHF clicks, such as harbor porpoises.…”

Section: Introductionmentioning

confidence: 99%

A real-time passive acoustic monitoring system to detect Yangtze finless porpoise clicks in Ganjiang River, China

Qiu

Lei

et al. 2022

Front. Mar. Sci.

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Phocoenidae live in fresh, coastal waters where they often share a significant portion of their habitat with humans. As a result, local activities (e.g., coastal fisheries and shipments) cause underwater noise pollution and threaten their ecosystem. To better conserve the habitat of porpoises, we aimed to study their activities in these waters by recording their echolocation clicks using a passive acoustic monitoring (PAM) system. However, because the off-line PAM instruments were often used in the past that need to be periodically deployed and recovered, data acquisition is typically obtained and analyzed in batches, rather than in real-time. A real-time PAM detection system would help minimize the impact of underwater noise on approaching porpoises. Furthermore, issues of bad quality data-with gaps due to loss or damage of the off-line PAM instruments-could be avoided with a real-time detection system. Therefore, in this study, we developed the Real-time Porpoise Click Detector-II (RPCD-II), equipped with a digital hydrophone, main memory (2 TB storage), a central processing unit, and a wireless transmission module. We deployed the RPCD-II under a docked fishing vessel at the Ganjiang River in Yangzi Zhou Town Fisheries Village, Nanchang City (8-9 December 2021), where it recorded signals of Yangtze finless porpoise and produced a real-time report. To validate the results of RPCD-II, another underwater sound recorder, the SoundTrap 300HF (ST), was also set up (as a control device) under the docked fishing vessel. Both devices recorded consistent results of 9330 clicks, further demonstrating RPCD-II's ability for the real-time detection of Yangtze finless porpoise in the field.

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Spatial–temporal variations in biosonar activity of Yangtze finless porpoise in the lower reaches of the Yangtze River and its correlation with underwater noise: Are quieter non‐shipping branches the remaining shelters?

Cited by 9 publications

References 70 publications

Identifying the seasonal characteristics of likely habitats for the Yangtze finless porpoise in Poyang Lake

Identifying the seasonal characteristics of likely habitats for the Yangtze finless porpoise in Poyang Lake

Seasonal and diel activities of the Yangtze finless porpoise in natural and highly disturbed habitats: Implications for conservation planning of freshwater cetaceans

A real-time passive acoustic monitoring system to detect Yangtze finless porpoise clicks in Ganjiang River, China

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