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Interannual variability of Indo-Pacific humpback dolphin (Sousa chinensis) habitats in the Eastern Pearl River Estuary, China

文献类型： 外文期刊

作者： Wan, Shujie 1 ; Li, Guodong 1 ; Zhang, Yutao 1 ; Cheng, Jing 1 ; Yang, Hang 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Fishery Machinery & Instrument Res Inst, Shanghai, Peoples R China

2.Sanya Trop Fisheries Res Inst, Sanya, Peoples R China

3.Laoshan Lab, Qingdao, Peoples R China

关键词： Sousa chinensis; sighting effort; habitant distribution; sea surface temperature; climate change; pearl river estuary

期刊名称：FRONTIERS IN MARINE SCIENCE （ 影响因子：3.0； 五年影响因子：3.8 ）

ISSN：

年卷期： 2025 年 12 卷

页码：

收录情况： SCI

摘要： Quantifying and analyzing the temporal and spatial variations of cetacean habitats is essential for establishing marine protected areas and preserving natural cetacean populations. Despite its importance, studies focusing on the interannual variability of cetacean habitats remain scarce. This study analyzed sighting records of Sousa chinensis and sea surface temperature (SST) data in the eastern Pearl River Estuary (PRE) from 2009 to 2022. Initially, the spatiotemporal variations in sighting effort and their correlation with SST were examined. Subsequently, the Suitability Index (SI) model was applied to calculate the distribution of S. chinensis habitats across different years and to assess interannual changes in habitat distribution in relation to climate change. The findings revealed that S. chinensis sightings were concentrated within a 227 km(2) area surrounding Lantau Island in the eastern PRE. The SST where sightings occurred ranged from 15.9 degrees C to 29.8 degrees C, with a strong positive correlation (r = 0.74, P<0.05) between sighting effort and SST. The SI model effectively identified habitat distribution patterns across years, highlighting a continuous decline in the area of suitable habitats (SI >= 0.6) from 2009 to 2022. The largest suitable habitat area was recorded in 2012 (a neutral year), while the smallest was observed in 2020 (a La Ni & ntilde;a year). During ENSO events, suitable habitats exhibited a northward shift in average latitude. This study introduces novel methodologies for S. chinensis habitat research, supports the development of more effective monitoring strategies, and provides valuable insights for the establishment of marine protected areas.

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