90-day Monitoring Report - National Marine Fisheries Service - NOAA

Number of Detections
12
10
8
6
4
2
0
1
3 1
1 1
UME04085
R.V Marcus G. Langseth
L-DEO/NMFS
05 January 2012
1
2
4
3
2
2
6
Total Number of Detections per Day
1 1
2
1 1 1 1 1 1 1 1 1
21
1
1
1
Unidentified pinniped
Unidentified large whale
Unidentified dead mammal
Unidentified beaked whale
Unidentifiable pinniped
Spotted seal
Ringed seal
Pacific Walrus
Northern Fur Seal
Killer whale
Humpback whale
Common minke whale
Bearded Seal
Figure 11. Number of protected species detections each day of the Coakley marine geophysical
survey.
Of the 42 protected species detection events during the Coakley marine geophysical survey, 23
detections (55%) occurred while the acoustic source was active and 19 detections (45%)
occurred while the acoustic source was silent. Table 7 demonstrates the average closest
approach of protected species to the source at various volumes.
Table 7. Average closest approach of protected species to the acoustic source at various
volumes.
Species Detected
Full Power
(1830 in³)
Number
of
detections
Average
closest
approach
to source
(meters)
Single Airgun 40 in³
Number of
detections
Average
closest
approach
to source
(meters)
Ramp up / Other
Reduced Volume
Number
of
detections
Average
closest
approach
to source
(meters)
Number
of
detections
Not Firing
Average
closest
approach
to source
(meters)
Humpback whale - - - - - - 1 300
Common minke whale - - - - - - 1 140
Killer whale - - - - - - 1 200
Unidentifiable cetacean - - - - - - 4 706
Northern fur seal - - - - - - 4 188
Spotted seal 3 322 - - - - - -
Ringed seal 5 173 - - - - - -
Bearded seal 6 572 - - - - - -
Pacific walrus 4 846 - - - - 2 175
Unidentifiable pinniped 5 594 - - - - 6 230
Pinnipeds were detected most frequently, consisting of 83% (35 detection records) of the total
records. Figure 12 demonstrates the total number of animals observed, per species, during the