Figure 54. spp. clicks in one minute bins between August 2014 and May 2015 at site D. Effort Kogia markings as in Figure 32. Anthropogenic Sounds Five types of anthropogenic sounds were detected between August 2014 and May 2015 at site D: broadband ship noise, MFA sonar less than 5 kHz, HFA sonar, echosounders and explosions. Broadband Ship Noise Broadband ship noise was a common anthropogenic sound. Broadband ship noise was detected throughout the recording period (Figure 55). There was no discernible diel pattern for broadband ships (Figure 56). Figure 55. Weekly presence of broadband ships between August 2014 and May 2015 at site D. Effort markings are described in Figure 31. Figure 56. Broadband ship noise in one minute bins between August 2014 and May 2015 at site D. Effort markings as in Figure 32. MFA and HFA Sonar MFA sonar was a common anthropogenic sound detected during these deployments. MFA sonar less than 5 kHz was detected intermittently with peaks in September and October 2014, as well as February and March 2015 (Figure 57). There was no apparent diel pattern for MFA sonar detections (Figure 58). One HFA sonar event was detected on April 29th, 2015 (Figure 59). There were too few HFA sonar detections to identify a diel pattern (Figure 60) Nearly 30% of analyst-defined MFA events contained packets which exceeded the minimum thresholds required for further analysis (Wiggins 2015; Table 3). MFA less than 5 kHz events were detected in September and October 2014, and between January and April 2015. Highest number of packets (>600) and Cumulative Sound Exposure Levels (CSEL) (> 170 dB re 1 µPa s) MFA events were detected in September 2014 (Figure 61). An increase in the number of packets at 164-165 dBpp re 1 µPa in Figure 61 (top panel) indicates that packet amplitudes occasionally exceeded the recording capability of the instrument, leading to signal clipping.
Figure 54. Kogia spp. clicks in one minute bins between August 2014 and May 2015 at site D. Effort markings as in Figure 32. Anthropogenic Sounds Five types of anthropogenic sounds were detected between August 2014 and May 2015 at site D: broadband ship noise, MFA sonar less than 5 kHz, HFA sonar, echosounders and explosions. Broadband Ship Noise Broadband ship noise was a common anthropogenic sound. Broadband ship noise was detected throughout the recording period (Figure 55). There was no discernible diel pattern for broadband ships (Figure 56). Figure 55. Weekly presence of broadband ships between August 2014 and May 2015 at site D. Effort markings are described in Figure 31. Figure 56. Broadband ship noise in one minute bins between August 2014 and May 2015 at site D. Effort markings as in Figure 32. MFA and HFA Sonar MFA sonar was a common anthropogenic sound detected during these deployments. MFA sonar less than 5 kHz was detected intermittently with peaks in September and October 2014, as well as February and March 2015 (Figure 57). There was no apparent diel pattern for MFA sonar detections (Figure 58). One HFA sonar event was detected on April 29th, 2015 (Figure 59). There were too few HFA sonar detections to identify a diel pattern (Figure 60) Nearly 30% of analyst-defined MFA events contained packets which exceeded the minimum thresholds required for further analysis (Wiggins 2015; Table 3). MFA less than 5 kHz events were detected in September and October 2014, and between January and April 2015. Highest number of packets (>600) and Cumulative Sound Exposure Levels (CSEL) (> 170 dB re 1 µPa s) MFA events were detected in September 2014 (Figure 61). An increase in the number of packets at 164-165 dBpp re 1 µPa in Figure 61 (top panel) indicates that packet amplitudes occasionally exceeded the recording capability of the instrument, leading to signal clipping.
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