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首页> 外文期刊>Ocean & coastal management >The use of passive acoustic monitoring as a census tool of gray whale (Eschrichtius robustus) migration
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The use of passive acoustic monitoring as a census tool of gray whale (Eschrichtius robustus) migration

机译：使用无源声学监测作为灰鲸（Eschrichtiusrobustus）迁移的普查工具

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Passive acoustic monitoring adds to knowledge of whale presence and distribution over space and time. The gray whale (Eschrictius robustus) undertakes an annual migration between remote feeding and breeding locales, with its highly sonorous nature suggesting employment of low-frequency calls to be inherent to travel behaviours, perhaps aiding navigation and social cohesion. We consider whether these calling behaviours can be used to better understand the process of migration, where call presence and relative abundance might represent a means to track the progress of migrating whales. Passive acoustic recordings made on the west coast of Vancouver Island, a mid-way point of gray whale migration, were first analysed for abundance over time to examine the progression of migration. Then the acoustic record was compared to shore-based recordings undertaken from Point Vincente, California to better assess their use as a census tool. The timing in peaks of calling, particularly of far-ranging moan-like calls, and shore counts showed a high degree of congruence when considered with a lag time of 8 days to account for travel time between the two survey locations. This suggests that passive acoustic monitoring could complement the long running and shore-based counts in recording annual population movement, and add to our understanding of gray whales on poorly known segments of their migration route or at times when visual observations are not possible.
机译：被动声学监测可增加鲸鱼在空间和时间上的存在和分布的知识。灰鲸（Eschrictiusrobustus）每年在偏远觅食地区和繁殖地点之间进行迁移，其高度son谐的特性表明，应将低频电话作为旅行行为的固有手段，也许有助于导航和社会凝聚力。我们考虑是否可以使用这些呼叫行为来更好地了解迁移过程，其中呼叫存在和相对丰度可能是跟踪鲸鱼迁移进度的一种手段。首先分析了温哥华岛西海岸（灰鲸迁徙的中途点）上的无源声音记录，以分析随时间推移的丰度，以检查迁徙的进程。然后，将声学记录与加利福尼亚州文森特角（Point Vincente）进行的岸上记录进行了比较，以更好地评估它们作为人口普查工具的用途。考虑到两个调查地点之间的旅行时间，将通话时间（8天的滞后时间）考虑在内时，通话高峰（尤其是类似an吟声的远程通话）和海岸计数的高峰时间显示出高度一致。这表明无源声波监测可以补充记录年种群移动的长期和岸上计数，并增加我们对迁移路线鲜为人知的部分或有时无法进行目视观察的灰鲸的了解。

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