Figure 5. Beam adjustments can triple the ensonified area.

Bibliographic Details
Format: Other/Unknown Material
Language:unknown
Published: eLife Sciences Publications, Ltd 2015
Subjects:
atlantic cod
Harbour porpoise
Online Access:http://dx.doi.org/10.7554/elife.05651.010
id crelifesciences:10.7554/elife.05651.010
record_format openpolar
spelling crelifesciences:10.7554/elife.05651.010 2023-07-23T04:18:16+02:00 Figure 5. Beam adjustments can triple the ensonified area. (A) Approximate detection volume for a harbour porpoise tracking fish in a quiet environment, based on the active sonar equation (1) and source energy levels as measured. Fixed detection threshold (Kastelein et al., 1999) of 27 dB re 1 µPa2s and target strength of −36 dB for the Atlantic cod of 29–30 cm (Au et al., 2007) is assumed. Pattern of the outer beam (solid line cross section) is based on beamwidth estimates obtained at short target ranges. The inner, narrow beam (dashed line) is based on the directionalities measured at long range, representing predicted beam pattern had the porpoise not switched to ‘wide-angle view’. (B) Relative change in the size of ensonified area ahead of the porpoise as it approaches a target. Surface area was computed as base of a cone with height equal to target range and an opening angle corresponding to the measured −3 dB beam angle (measured area, solid line in A) or median −3 dB beam angle calculated for long ranges (>2 m; predicted area, dashed line in A). Color indicates inter-click intervals. Squares and circles mark data points obtained with the large (N = 34) and small (N = 458) array, respectively. The bold horizontal line indicates points where the measured and the predicted areas are equal. 2015-04-29T11:11:24Z http://dx.doi.org/10.7554/elife.05651.010 unknown eLife Sciences Publications, Ltd component 2015 crelifesciences https://doi.org/10.7554/elife.05651.010 2023-07-05T08:35:16Z Other/Unknown Material atlantic cod Harbour porpoise eLife (E-Journal - via Crossref)
institution Open Polar
collection eLife (E-Journal - via Crossref)
op_collection_id crelifesciences
language unknown
format Other/Unknown Material
title Figure 5. Beam adjustments can triple the ensonified area.
spellingShingle Figure 5. Beam adjustments can triple the ensonified area.
title_short Figure 5. Beam adjustments can triple the ensonified area.
title_full Figure 5. Beam adjustments can triple the ensonified area.
title_fullStr Figure 5. Beam adjustments can triple the ensonified area.
title_full_unstemmed Figure 5. Beam adjustments can triple the ensonified area.
title_sort figure 5. beam adjustments can triple the ensonified area.
publisher eLife Sciences Publications, Ltd
publishDate 2015
url http://dx.doi.org/10.7554/elife.05651.010
genre atlantic cod
Harbour porpoise
genre_facet atlantic cod
Harbour porpoise
op_doi https://doi.org/10.7554/elife.05651.010
_version_ 1772180516911448064

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