Munger Lisa, Lammers Marc O, Cifuentes Mattie, Würsig Bernd, Jefferson Thomas A, Hung Samuel K
Oceanwide Science Institute, P.O. Box 61692, Honolulu, Hawaii 96839, USA.
Department of Marine Biology, Texas A&M University, 200 Seawolf Parkway, OCSB #243, Galveston, Texas 77553, USA.
J Acoust Soc Am. 2016 Oct;140(4):2754. doi: 10.1121/1.4963874.
Long-term passive acoustic monitoring (PAM) was conducted to study Indo-Pacific humpback dolphins, Sousa chinensis, as part of environmental impact assessments for several major coastal development projects in Hong Kong waters north of Lantau Island. Ecological acoustic recorders obtained 2711 days of recording at 13 sites from December 2012 to December 2014. Humpback dolphin sounds were manually detected on more than half of days with recordings at 12 sites, 8 of which were within proposed reclamation areas. Dolphin detection rates were greatest at Lung Kwu Chau, with other high-occurrence locations northeast of the Hong Kong International Airport and within the Lung Kwu Tan and Siu Ho Wan regions. Dolphin detection rates were greatest in summer and autumn (June-November) and were significantly reduced in spring (March-May) compared to other times of year. Click detection rates were significantly higher at night than during daylight hours. These findings suggest high use of many of the proposed reclamation/development areas by humpback dolphins, particularly at night, and demonstrate the value of long-term PAM for documenting spatial and temporal patterns in dolphin occurrence to help inform management decisions.
作为对大屿山以北香港水域几个主要海岸开发项目进行环境影响评估的一部分,开展了长期被动声学监测(PAM)以研究中华白海豚(Sousa chinensis)。2012年12月至2014年12月期间,生态声学记录仪在13个地点进行了2711天的记录。在12个地点超过半数有记录的日子里人工检测到了中华白海豚的声音,其中8个地点位于拟议的填海区域内。龙鼓洲的海豚检测率最高,其他高出现率地点位于香港国际机场东北部以及龙鼓滩和小蚝湾区域内。海豚检测率在夏季和秋季(6月至11月)最高,与一年中的其他时间相比,春季(3月至5月)显著降低。夜间的滴答声检测率明显高于白天。这些发现表明中华白海豚大量使用了许多拟议的填海/开发区,尤其是在夜间,并证明了长期被动声学监测对于记录海豚出现的时空模式以帮助为管理决策提供信息的价值。