| id |
crelifesciences:10.7554/elife.05651.004
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openpolar
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crelifesciences:10.7554/elife.05651.004 2023-07-23T04:19:40+02:00 Figure 2. Long terminal phase of prey pursuit by an echolocating harbour porpoise. (A) Echogram (see ‘Material and methods’: Live prey capture) displaying sonar clicks and echoes recorded by an acoustic tag attached to the animal just behind its blowhole (Johnson et al., 2004). y-axis (left) indicates time elapsed from emitted clicks to returning echoes, expressed also as target range (right). Clicks emitted at rates corresponding to inter-click intervals shorter than 3.3 ms time-window are displayed repeatedly. The color scale indicates signal energy from blue (faint) to red (intense). As pursuit proceeds from water column (0.7–1.1 m from surface, 2–2.5 m above sea floor) to sea bottom the immediate acoustic scene becomes more cluttered with complex bottom echoes shortly following fish echoes (from −9 s onwards). (B) Inter-click intervals color-coded for relative apparent output level (RAOL; [Wisniewska et al., 2012]) of signals as recorded by the tag. RAOL variation may stem from rapid head movements, source level adjustments, and/or beam directionality changes (with less energy reaching the tag from a narrow beam). On two occasions, when the fish escaped into the open space of the water column (at −16 s and −13 s), the porpoise increased its ICIs significantly, beyond the values considered as buzz (Wisniewska et al., 2012). However, when the fish escaped to similar distances while being at the bottom (and thus moving in arguably a more predictable way) the porpoise increased the ICIs only slightly, which might point to anticipatory acoustic tracking on the part of the echolocating animal. 2015-04-29T07:11:24Z http://dx.doi.org/10.7554/elife.05651.004 unknown eLife Sciences Publications, Ltd component 2015 crelifesciences https://doi.org/10.7554/elife.05651.004 2023-07-05T08:47:24Z Other/Unknown Material Harbour porpoise eLife (E-Journal - via Crossref)
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| institution |
Open Polar
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| collection |
eLife (E-Journal - via Crossref)
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| op_collection_id |
crelifesciences
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| language |
unknown
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| format |
Other/Unknown Material
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| title |
Figure 2. Long terminal phase of prey pursuit by an echolocating harbour porpoise.
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| spellingShingle |
Figure 2. Long terminal phase of prey pursuit by an echolocating harbour porpoise.
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| title_short |
Figure 2. Long terminal phase of prey pursuit by an echolocating harbour porpoise.
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| title_full |
Figure 2. Long terminal phase of prey pursuit by an echolocating harbour porpoise.
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| title_fullStr |
Figure 2. Long terminal phase of prey pursuit by an echolocating harbour porpoise.
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| title_full_unstemmed |
Figure 2. Long terminal phase of prey pursuit by an echolocating harbour porpoise.
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| title_sort |
figure 2. long terminal phase of prey pursuit by an echolocating harbour porpoise.
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| publisher |
eLife Sciences Publications, Ltd
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| publishDate |
2015
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| url |
http://dx.doi.org/10.7554/elife.05651.004
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| genre |
Harbour porpoise
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| genre_facet |
Harbour porpoise
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| op_doi |
https://doi.org/10.7554/elife.05651.004
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| _version_ |
1772182981036736512
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