Section 1 Introduction - National Marine Fisheries Service - NOAA

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NBK at Bangor EHW-1 Pile Replacement Project Final Marine Mammal Monitoring Report Table 15. Cetacean Behaviors by Distance from Pile (During Construction Activity Only) Behavior 0-50 m Distance from Pile Percent Among Distances Bins [percent (n)] End of Shutdown Zone 51-6,000 m End of Buffer Zone >6,000 m Swim 0 (0) 75 (3) 0 (0) Dive 0 (0) 25 (1) 0 (0) Note: 1 Observations in the table only include those activities for which distances to the nearest pile were known. Any observations with unknown distances were not included in the analysis. Table 16. Pinniped Behaviors by Distance From Pile 1 (During Construction Activity Only) Behavior 0-50 m Distance from Pile Percent Among Distances Bins [percent (n)] End of Shutdown Zone 51-6,000 m Bangor, Washington 56 End of Buffer Zone >6,000 m Dive 3.25 (5) 13.63 (21) 0 (0) Enter Water 0 (0) 2.60 (4) 0 (0) Forage 0.65 (1) 1.30 (2) 0 (0) Haulout 0 (0) 3.24 (5) 0 (0) Look 3.90 (6) 15.58 (24) 0 (0) Mill 0 (0) 5.19 (8) 0 (0) Play 0 (0) 0.65 (1) 0 (0) Rest 0 (0) 4.55 (7) 0 (0) Sink 1.95 (3) 11.69 (18) 0 (0) Slap 0 (0) 0.65 (1) 0 (0) Swim 1.95 (3) 16.23 (25) 0 (0) Travel 0 (0) 6.49 (10) 0 (0) Unknown 0.65 (1) 1.30 (2) 0 (0) Vocalize 0 (0) 4.55 (7) 0 (0) Note: 1 Observations in the table only include those activities for which distances to the nearest pile were known. Any observations with unknown distances were not included in the analysis. Analysis of Construction Versus Non-Construction. Animal behavior recorded during construction periods was compared to information collected during non-construction periods. Cetaceans For cetaceans, “traveling” only occurred during non-construction periods. “Chuffing” and “diving” occurred only during construction activities. “Swimming” appeared to be unaffected by the occurrence of construction activities (Table 17).
NBK at Bangor EHW-1 Pile Replacement Project Final Marine Mammal Monitoring Report Pinnipeds Table 17. Cetacean Behaviors Observed During Construction Versus Non-Construction Periods During EHW-1 PRP Behavior Construction? [percent (n)] No Yes Chuff 0 (0) 11.8 (2) Swim 29.4 (5) 41.2 (7) Travel 11.8 (2) 0 (0) Dive 0 (0) 5.9 (1) During non-construction period monitoring, MMOs most commonly observed pinnipeds “sinking” (n=238; 21.98%), “looking” (n=221; 20.41%), and “swimming” (n=188; 17.36) (Table 18). The most common pinniped behaviors during construction were “swimming” (n=37; 3.42%) and “looking” (n=35; 3.23%) (Table 18). The majority of observed pinniped behaviors decreased from non-construction to construction periods. “Chuffing” and “entering the water” remained the same between both periods. There were increases in “change direction,” “flushing,” and “unknown” from the non-construction period to construction period. Analysis of Behavioral Observations Made Before, During, and After Construction. Marine mammal behaviors were documented for sightings that occurred during the 30-minute construction pre-watch; during construction activity; and during the 30-minute construction post-watch – before, during, and after construction activity, respectively (refer to Appendix E). Cetaceans The most common cetacean behavior during construction activities was “swimming” (before [n=2; 0.2%]; during [n=4; 0.4%]; after [n=1; 0.1%] pile driving). “Chuffing” occurred before and after pile driving (each n=1; 0.1%). Occurrence of “swimming” decreased post-construction in relation to pre-construction. “Swimming” behaviors increased during construction (Table 19, Figure 15). Pinnipeds Pinnipeds were most often “looking” (n=6; 3.9%) and “milling” (n=4; 2.6%) during the 30-minute before pile-driving period (Table 20, Figure 16). During pile driving, pinnipeds most often were “swimming” (n=24; 15.5%), “looking” (n=23; 14.8%), and “diving” (n=19; 12.3%). During the 30-minute after pile driving period, pinnipeds were most often “looking” (n=7; 4.5%), “sinking” (n=6; 3.9%), and “diving” (n=4; 2.6%). Bangor, Washington 57
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Section 1 Introduction - National Marine Fisheries Service - NOAA

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