Results 111 to 120 of about 424 (138)

Thresholds of population persistence for the Yangtze finless porpoise: implications for conservation managements

Integrative Zoology, 2021
AbstractThe Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis), a critically endangered species, is the only cetacean species in the Yangtze River following the functional extinction of baiji (Lipotes vexillifer). To inform conservation actions, two important questions need to be addressed: what is the threshold value of survival ...
Zhigang, Mei, Mao, Chen, Yi, Han, Yujiang, Hao, Jinsong, Zheng, Kexiong, Wang, Ding, Wang   +6 more
openaire   +2 more sources

An automatic identification algorithm of Yangtze finless porpoise

2015 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC), 2015
This paper describes the time-frequency features of the Yangtze finless porpoise acoustic signals firstly. Then an automatic identification algorithm for the Yangtze finless porpoise is presented based on Hilbert Huang Transform and BP artificial neural network. The algorithm includes two steps: feature extraction and signal identification.
Hongjian Song, Feng Xu, Bangyou Zheng, Ying Xiang, Juan Yang, Xudong An   +5 more
openaire   +1 more source

Behavioral laterality in Yangtze finless porpoises ( Neophocaena asiaeorientalis asiaeorientalis )

Behavioural Processes, 2017
The Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis) is a critically endangered species with less than 1000 individuals expected to be left in the wild. While many studies have been conducted on laterality among several cetacean species, no studies investigating the Yangtze finless porpoise have been conducted.
Sara, Platto, C, Zhang, Matthew K, Pine, W K, Feng, L G, Yang, A, Irwin, D, Wang   +6 more
openaire   +2 more sources

An artificial intelligence recognition algorithm for Yangtze finless porpoise

OCEANS 2015 - MTS/IEEE Washington, 2015
Processing marine-mammal signals for species classification and monitoring of endangered marine mammals are problems that have recently attracted attention in the scientific literature. Currently, the detection of signals of interest is typically accomplished through a combination of visual inspection of spectrograms and listening to the data.
null Hongjian Song, null Feng Xu, null Bangyou Zheng, null Ying Xiang, null Juan Yang, null Xudong An   +5 more
openaire   +1 more source

The ontogeny of echolocation in a Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis)

The Journal of the Acoustical Society of America, 2007
Acoustic and concurrent behavioral data from one neonatal male Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis) in captivity were presented. The calf click train was first recorded at 22days postnatal, and the frequency of hydrophone-exploration behavior with head scanning motions in conjunction with emissions of click trains by the ...
Songhai, Li, Ding, Wang, Kexiong, Wang, Jianqiang, Xiao, Tomonari, Akamatsu   +4 more
openaire   +2 more sources

Ultrastructure of the Spermatozoa of the Yangtze Finless Porpoise (Neophocaena phocaenoides asiaeorientalis)

Anatomia, Histologia, Embryologia, 2009
SummarySemen sample was collected from two captive adult Yangtze finless porpoises (Neophocaena phocaenoides asiaeorientalis) during physical examination. One individual was aged about 9 years with body length 143 cm (total length) and body weight 46.1 kg in 2003. The age of the other was unknown and its body length was 147 cm and body weight was 43 kg
H Y, Li, X F, Zhang, D, Wang, D Q, Chen
openaire   +2 more sources

Habitat preference of the Yangtze finless porpoise in a minimally disturbed environment

Ecological Modelling, 2017
Abstract Analyses of animal species distribution in a neutral or minimally-interrupted habitat provide a baseline that is essential for assessment of population status, identification of key habitat, and conservation planning for habitat protection and restoration. In this study, we surveyed the occurrence of the Yangtze finless porpoise (Neophocaena
Zhigang Mei, Mao Chen, Yongtao Li, Shiang-Lin Huang, Jie Haung, Yi Han, Binting Zhu, Chunsheng Li, Kexiong Wang, Ding Wang   +9 more
openaire   +1 more source

Passive acoustical survey of finless porpoises in the Yangtze River, China

The Journal of the Acoustical Society of America, 1999
Finless porpoises (Neophocaena phocaenoides) are distributed in Asian waters. The narrow-band and high-frequency pulse sonar signals produced by this species are distinctive from background noises. Underwater sound monitoring by a hydrophone (BK8103) along board sides of a research vessel concurrent with visual observation were conducted in the Yangtze
Tomonari Akamatsu, Ding Wang, Kexiong Wang   +2 more
openaire   +1 more source

Saving the Yangtze finless porpoise: Time is rapidly running out

Biological Conservation, 2017
Abstract The Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis) is the world's only freshwater porpoise and is endemic to the Yangtze River. However, it is now Critically Endangered, with its long-term survival very uncertain due to escalating anthropogenic pressure.
Shiang-Lin Huang, Zhigang Mei, Yujiang Hao, Jinsong Zheng, Kexiong Wang, Ding Wang   +5 more
openaire   +1 more source

Finding baiji and freshwater finless porpoises in the Yangtze River, China

The Journal of the Acoustical Society of America, 2011
A stereo passive acoustic event recorder (A-tag) has been applied for range-wide monitoring of baiji and finless porpoises in China. As the pilot study, two research vessels were operated in 1700 km historic habitat of both species from Yichang to Shanghai in 2006.
Tomonari Akamatsu, Lijun Dong, Ding Wang, Kexiong Wang, Songhai Li, Shouyue Dong, Xiujiang Zhao, Satoko Kimura   +7 more
openaire   +1 more source