Whistle signal variations among three Indo-Pacific humpback dolphin populations in the South China Sea:a combined effect of the Qiongzhou Strait’s geographical barrier function and local ambient noise?  

作　　者：Jing YUAN Zhitao WANG Pengxiang DUAN Yousheng XIAO Hongke ZHANG Zhixiong HUANG Ruichun ZHOU Hua WEN Kexiong WANG Ding WANG 

机构地区：[1]The Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences,Institute of Hydrobiology of the Chinese Academy of Sciences,Wuhan,China [2]University of Chinese Academy of Sciences,Beijing,China [3]Pearl River Estuary Chinese White Dolphin National Nature Reserve,Zhuhai,China [4]National Hepu Dugong Nature Reserve Administration Station,Beihai,China [5]Hong Kong-Zhuhai-Macao Bridge Authority,Zhuhai,China

出　　处：《Integrative Zoology》2021年第4期499-511,共13页整合动物学（英文版）

基　　金：This research was supported by grants from the National Natural Science Foundation of China(Grant No.41806197);Ocean Park Conservation Foundation of Hong Kong(AW011920);Chinese white dolphin monitoring program of Guangzhou harbor deepwater navigation channel widening project(Grant No.HTYXJC)to Zhitao Wang.

摘　　要：Geographic variations in the dolphin whistles could be useful in assessing association and isolation among populations.Whistle of free-ranging Indo-Pacific humpback dolphins(Sousa chinensis)among the Pearl River Estuary(PRE),Leizhou Bei(LZB)and Sanniang Bay(SNB)populations were investigated.A total of 2850 whistles with legible fundamental contour were extracted and 15 acoustic parameters were measured.Contrary to SNB,PRE and LZB had the same relative proportion of tonal type compositions with flat and sine representing the most frequent types.The generalized linear model analysis showed significant acoustic difference among populations and tonal types.All frequency parameters in SNB were significantly higher than those in PRE and LZB,where no significant variation was observed in most of the parameters either at the population level or within each tonal type.Canonical discriminant functions analysis showed a smaller difference between PRE and LZB than between PRE and SNB and between LZB and SNB.Compared with previous recordings,recent recordings demonstrated a consistent pattern of becoming higher in whistle frequency parameters in both LZB and SNB populations,suggesting that noise pollution in LZB and SNB increasing with time according to the acoustic niche hypothesis.Dolphin whistle’s geographic variations could be shaped by the combined function of the geographical barrier function of the Qiongzhou strait and local ambient noise.Considering the isolated condition and the relatively smaller population size of the humpback dolphin in the SNB,more effective and proactive conservation actions should be taken to prevent the extinction of small populations.

关 键 词：geographic difference geographical barrier Indo-Pacific humpback dolphins noise WHISTLE 

分 类 号：P73[天文地球—海洋科学]