Comparison of echolocation behaviour between coastal and riverine porpoises
Comparison of echolocation behaviour between coastal and riverine porpoises
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DOI：
10.1109/ut.2007.370755
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发表时间：
2007-02
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通讯作者：
T. Akamatsu;J. Teilmann;Lee A. Miller;J. Tougaard;Rune Dietz;Ding Wang;Ke‐Xiong Wang;Ursula Siebert;Yasuhiko Naito
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文献类型：
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作者：
T. Akamatsu;J. Teilmann;Lee A. Miller;J. Tougaard;Rune Dietz;Ding Wang;Ke‐Xiong Wang;Ursula Siebert;Yasuhiko Naito
回声定位行为的港口江豚和6江豚记录在开放水域系统使用声学数据记录器（A-标签）。在4.6小时内，港口江豚共记录了1359次点击列车，江豚在82.3小时内记录了46,240次点击列车。港口和江豚产生声纳点击列车平均每12.3和6.4秒，分别。在"咔哒声“列车间隔期间，鼠海豚沉默或产生低于148分贝的咔哒声。1 mPa，标签的检测阈值。在两个物种中，90%的点击列车间隔为20秒或更短。这意味着鼠海豚经常发出密集的咔哒声。持续超过50 s的点击列车间隔占江豚总间隔的1%，占港湾鼠海豚的4%。这两个物种在大多数情况下游泳没有激烈的点击不到10米，但偶尔保持沉默或使用未被发现的低强度点击超过1分钟。在这些期间，海豚将容易被渔网缠绕。
Echolocation behaviour of a harbor porpoise and six finless porpoises was recorded in open-water systems using acoustic data loggers (A-tag). In total 1359 click trains were recorded during 4.6 h for the harbor porpoise and 46,240 click trains were recorded during 82.3 h for the finless porpoises. The harbor and finless porpoises produced sonar click trains every 12.3 and 6.4 s on average, respectively. During the inter-click-train interval, the porpoises were silent or produced clicks below 148 dB re. 1 mPa, the detection threshold of the tag. Ninety percent of the inter-click-train intervals were 20 s or less in both species. This means that porpoises frequently produce intense click trains. Click-train intervals lasting over 50 s constituted 1% of the total intervals in finless porpoises and 4% in the harbor porpoise. Both species swam without intense clicks for less than 10 m in most cases, but occasionally remained silent or used undetected low-intensity clicks for more than 1 min. During these periods, the porpoises would be susceptible to entanglement in fishing nets.