Table 1 Information on the tagged animals exposed to AHD.

From: Wild harbour porpoises startle and flee at low received levels from acoustic harassment device

Animal ID

Deployment ID

Type of DTAG

Deployment date

Age class and sex

Standard length (cm)

Blubber thickness (mm)

Hours of data (hours of ECG data)

Initial AHD RL (dB re 1 μPa rms)

Initial distance to AHD (km)

Time from release to exposure (minutes)

Time from release until feeding buzzes occur (minutes)

Time from exposure end until feeding buzzes occur (minutes)

HP1

hp18_134a

DTAG4 (GPS)

14-05-2018

Juvenile F

111

22

44

130

0.9

16

–

34

HP2

hp18_151a

ECG-DTAG3

31-05-2018

Juvenile M

122

16

10 (2.5)

131

–

17

–

24

HP3

hp19_262a

DTAG4 (GPS)

19-09-2019

Juvenile M

115

17

37

132

2.2

202

19

16

HP4

hp19_289a

ECG-DTAG3

16-10-2019

Juvenile M

117

18

14 ( 3)

98

–

189

24

42

HP5

hp19_290a

DTAG4 (GPS)

17-10-2019

Juvenile M

112

16

2

99a

6.9

100

75

Tag offb

HP6

hp19_290b

DTAG3

17-10-2019

Juvenile F

132

19

12

106

–

90

22

25

  1. Age class determined according to Lockyer and Kinze73. Blubber thickness was measured by ultrasound in 3 lateral and 3 dorsal places on the porpoise. The number given is the average of those 6 measurements for each animal.
  2. aHP5 generally had low signal-to-noise ratios, so the initial five pings used for RL evaluation were found among the initial 34 pings.
  3. bTag fell off 4 min after end of exposure, and the porpoise had not yet started feeding during this time.
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