Federal Register - June 4, 2021
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Source: Federal Register
30109
Federal Register / Vol. 86, No. 106 / Friday, June 4, 2021 / Proposed Rules TABLE 12MARINE MAMMAL AND VOLUMETRIC DENSITY IN THE ENSONFIED AREASContinued Dive profile/vertical habitat
Common name
Sei whale
Minke whale
Blue whale
Sperm whale
Dwarf sperm whale
Pygmy sperm whale
Killer Whale
Pygmy killer whale
Northern bottlenose whale
Cuviers beaked whale
Mesoplodon beaked whales
Melon-headed whale
Rissos dolphin
Long-finned pilot whale
Short-finned pilot whale
Atlantic white-sided dolphin
White-beaked dolphin
Short-beaked common dolphin
Atlantic spotted dolphin
Pantropical spotted dolphin
Striped dolphin
Frasers dolphin
Rough toothed dolphin
Clymene dolphin
Spinner dolphin
Common bottlenose dolphin offshore stock
Common bottlenose dolphin coastal stocks
Harbor porpoise
0200 m
>200 m
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
LME area density per km2 1 2
LME
volumetric density per km3 3
Offshore volumetric density per km3 5
Offshore ensity per km2 2 4
0.0008
0.002
0.000009
0
0
0
0.000009
0.000009
0
0
0
0
0.0020
0.0220
0.0220
0.0453
0.00003
0.0891
0.0013
0
0
0
0.0005
0.0032
0
0
0.1359
0.0403
0.00400
0.01000
0.00005
0
0
0
0.00005
0.00005
0
0
0
0
0.01000
0.11000
0.11000
0.22650
0.00015
0.44550
0.00650
0
0
0
0.00250
0.01600
0
0
0.6795
0.20150
0
0
0.000009
0.0056
0.005
0.005
0.000009
0.000009
0.00009
0.0062
0.0046
0.0010
0.0128
0.0220
0.0220
0
0
0
0.0241
0.0015
0.0614
0.0004
0.0010
0
0.0002
0.1615
0
0
0
0
0.00005
0.01120
0.01000
0.01000
0.00005
0.00005
0.00018
0.01240
0.00920
0.00500
0.06400
0.04400
0.04400
0
0
0
0.12050
0.00750
0.30700
0.000200
0.000200
0
0.00100
0.3230
0
0
0.2844
0.0939
1.4220
0.4695
0
0
0
0
Pinnipeds Harbor Seal
Gray Seal
X
X
1 LME
is the area in shore of the 200 m depth contour.
Unless otherwise stated Roberts, Best et al. 2016.
volumetric density is the LME area density divided by 0.2 km.
4 Offshore is the area offshore of the 200 m depth contour.
5 Offshore volumetric density is the offshore area density divided by 0.2 km or 0.5 km for shallow or deep diving species or 0.5 km for deep diving species.
6 Density from Roberts, Schick et al. 2020.
2 Source:
3 LME
Using Area of Ensonification and Volumetric Density To Estimate Exposures Estimates of potential incidents of Level B harassment i.e., potential exposure to levels of sound at or exceeding the 160 dB rms threshold are then calculated by using 1 the combined results from output characteristics of each source and identification of the predominant sources in terms of acoustic output; 2
their relative annual usage patterns for each operational area; 3 a sourcespecific determination made of the area of water associated with received sounds at the extent of a depth boundary; and 4 determination of a biologically-relevant volumetric density
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of marine mammal species in each area.
Estimates of Level B harassment by acoustic sources are the product of the volume of water ensonified at 160 dB
rms or higher for the predominant sound source for each relevant survey and the volumetric density of animals for each species. Sourceand stratumspecific exposure estimates are the product of these ensonified volumes and the species-specific volumetric densities Table 12. The general take estimate equation for each source in each depth statrum is density
ensonified volume line kms. The humpback whale and exposure to sound from the EK 60 can be used to demonstrate the calculation:
1. EK60 ensonified volume; 0200 m:
0.0142 km2 16058.8 km = 228.03 km3
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2. Estimated exposures to sound 160
dB rms; humpback whale; EK60, LME
region: 0.008 humpback whales/km3
228.03 km3 = 1.8 estimated humpback exposures to SPLs 160 dB rms resulting from use of the EK60 in the 0200 m depth stratum.
Similar calculations were conducted for the ME 70 and DSM300 for each animal in the LME region, with the exception of baleen whales, as these sound sources are outside of their hearing range. Totals in Tables 13 and 14 represent the total take of marine mammals, by species, across all relevant surveys and sources rounded up to the nearest whole number.
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