Composite Training Unit Exercises and Joint Task ... - Govsupport.us

COMPTUEX/JTFEX EA/OEA Final Chapter 4exposure levels of 100 to 201 dB re 1 μPa 2 -s) in a laboratory setting (Schlundt et al., 2000, Finneran et al.,2005).The exposures depicted in Table 4.3-13 would not necessarily occur to 516 different individuals. Thesame individual could experience behavioral disruption more than once over the course of a year,particularly if the animal is resident in the area of the range. Thus, the estimated number of individualbottlenose dolphins experiencing Level B harassment may be fewer than 516. Mitigation measuresdetailed in Chapter 5 would further reduce the potential for any effect on bottlenose dolphins. The Navytherefore concludes that the proposed action would not affect annual rates of recruitment or survival forbottlenose dolphins, and would not have a significant impact on this species and stock.Common Dolphin (Long-beaked and Short-beaked) (Delphinus capensis and D. delphis)Two species of common dolphin occur off California, the more coastal long-beaked dolphin (D. capensis)and the more offshore short-beaked dolphin (D. delphis). Thus, much of the available information has notdifferentiated between the two species. The long and short-beaked common dolphins are not listed underthe ESA and are not considered depleted or strategic under the MMPA. The minimum populationestimates are 43,360 (CV = 0.72) (Carretta et al., 2005). The modeling efforts and harassment analysisfor mid-frequency active sonar estimate that Level A harassment of common dolphins could occur. Theanalysis estimates that up to 69,258 incidents of non-injurious behavioral harassment, 3,464 incidents ofnon-injurious physiological harassment (Level B harassment), and 8 incidents of Level A harassment maybe experienced by common dolphins on annual basis (Table 4.3-14). Twenty-seven common dolphinscould be exposed to impulsive noise or pressures from underwater detonations that could cause TTS andtwenty-seven could be exposed to impulsive noise or pressures that could cause slight physical injury.Table 4.3-14. Raw Annual Acoustic Model Output of Common Dolphin(Long-beaked and Short-beaked)Behavioral173-