Dolphin 1 0 3 2
2009-02-18 - extension: rar - size: 2 MB
Dolphin 1 0 3 2
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Cooperative Dolphins of Laguna: Data on Nature of Signal Nature of Signal
We have video recordings of complete, or partial, 68 signaling sequences, filmed (More) Nature of Signal
We have video recordings of complete, or partial, 68 signaling sequences, filmed on 11 different days, in the spring of 2006, from September 7 to November 5, in collaboration with colleagues Arthur Schiefler and Prof. Dr. Geraldo Milioli. Of these 68 signals, 54 were recorded in two adjacent, standing fishermen only, locations, on the Laguna side of the inlet. The other 14 were recorded in a more western location on the Laguna site, comprising 6-10 active standing fishermen on the eastern portion of the site joined to the west by two canoeists, all forming a single line.
The sequence typically begins with the rapid surfacing of the signaling dolphin (henceforth: start of signal). Of the 45 signals for which we have a video record of first sighting a would-be signaler, in 42 the first body part observed above water was the rostrum or rostrum and head, in one episode of breaking surface, the dorsal fin was seen first, and in two others, the entire body could be observed under the water prior to breaking surface.
In 53 of 55 of videorecorded cases, the surfacing was accompanied by a short, explosive, air exhalation. We were able to record the time lapse between first sighting of a signaling dolphin and visible start of exhalation in 41. In one of these cases, the exhalation started at the same time the dolphin first emerged. In the other 40, the exhalation took place after a brief delay (Mean: 0.16 seconds; range: 0.07-0.33).
Signaling dolphins reach maximum elevation of their head within 0.19 seconds of first becoming visible (N=33, range, 0.1-0.5 seconds), with the head at an average angle to the water of 28.8º (N=24, range 15º-35º). The fin is typically first seen in 0.3 seconds from the start (N=39, range; 0-0.77).
On average, the tip of the rostrum touches the water in 0.43s from the start of the sequence (N=33; range 0.17-0.83). The dorsal fin reaches its approximate highest position by 0.84s (N=48, range .53-1.5).
In 39 of 53 cases, the last part observed before the dolphin vanished below the surface of the water, the dorsal fin was seen last. In 8 additional cases, the tip of the dorsal fin and the midway portion of the dorsal part of the body, approximately midway between fin and fluke, were seen last at the same time. In 4 other cases, the fluke was seen last.
The average duration of any part of the body staying above water during the signaling sequence was 1.40s (N=56; range-0.93-2.50; standard deviation 0.3).
Of the 68 signals, 34 were directed seaward, roughly in an eastern direction, in 7 the head was directly facing the line (North), in 8 it was directed towards the line, but at an angle (roughly north-east or north-west), in 17, the movement was towards the right, away from the sea, in a right-hand angle to the left of the line of standing fishermen or mixed fishermen/canoeists. In one case it was directly away from the fishermen (South), and in still one other case, away at an angle (roughly SW). (Less)
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Dolphin Installer 1.0.3.2.zip
2008-12-04 - extension: zip - size: 2 MB
Dolphin Installer 1.0.3.2.zip
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Dolphin 1 0 3 2
2009-05-31 - extension: rar - size: 2 MB
Dolphin 1 0 3 2
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Dolphin Installer 1.0.3.2.zip
2008-11-13 - extension: zip - size: 2 MB
Dolphin Installer 1.0.3.2.zip
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