Large whale surveys off Southern California using passive acoustic gliders

2021 ◽  
Vol 150 (4) ◽  
pp. A47-A47
Author(s):  
David K. Mellinger ◽  
Selene Fregosi ◽  
Kristen Ampela
Keyword(s):  
Southern California ◽  
Passive Acoustic

Passive acoustic beaked whale surveys using gliders off Southern California

2019 ◽  
Vol 146 (4) ◽  
pp. 2770-2770
Author(s):  
David K. Mellinger ◽  
Sharon L. Nieukirk ◽  
Selene Fregosi
Keyword(s):  
Southern California ◽  
Beaked Whale ◽  
Passive Acoustic

scholarly journals Long-Term Patterns of Noise From Underwater Explosions and Their Relation to Fisheries in Southern California

2021 ◽  
Vol 8 ◽  
Author(s):  
Anna Krumpel ◽  
Ally Rice ◽  
Kaitlin E. Frasier ◽  
Fairlie Reese ◽  
Jennifer S. Trickey ◽  
...  
Keyword(s):  
Southern California ◽  
Temporal Patterns ◽  
Purse Seine ◽  
Economic Losses ◽  
Negative Effects ◽  
Underwater Explosions ◽  
Marine Life ◽  
Spatio Temporal ◽  
Passive Acoustic

Acoustic deterrents can reduce marine mammal interactions with fisheries and aquacultures, but they contribute to an increasing level of underwater noise. In Southern California, commercially produced explosive deterrents, commonly known as “seal bombs,” are used to protect fishing gear and catch from pinniped predation, which can cause extensive economic losses for the fishing community. Passive acoustic monitoring data collected between 2005 and 2016 at multiple sites within the Southern California Bight and near Monterey Bay revealed high numbers of these small-charge underwater explosions, long-term, spatio-temporal patterns in their occurrence, and their relation to different commercial purse-seine fishing sectors. The vast majority of explosions occurred at nighttime and at many nearshore sites high explosion counts were detected, up to 2,800/day. Received sound exposure levels of up to 189 dB re 1 μPa2-s indicate the potential for negative effects on marine life, especially in combination with the persistence of recurring explosions during periods of peak occurrence. Due to the highly significant correlation and similar spatio-temporal patterns of market squid landings and explosion occurrence at many sites, we conclude that the majority of the recorded explosions come from seal bombs being used by the California market squid purse-seine fishery. Additionally, seal bomb use declined over the years of the study, potentially due to a combination of reduced availability of market squid driven by warm water events in California and regulation enforcement. This study is the first to provide results on the distribution and origin of underwater explosions off Southern California, but there is a substantial need for further research on seal bomb use in more recent years and their effects on marine life, as well as for establishing environmental regulations on their use as a deterrent.

Long‐term Passive Acoustic Monitoring of Delphinids in the Southern California Bight

2008 ◽  
Vol 123 (5) ◽  
pp. 3101-3101
Author(s):  
Melissa S. Soldevilla ◽  
John A. Hildebrand ◽  
Sean M. Wiggins ◽  
Marie A. Roch
Keyword(s):  
Southern California ◽  
Acoustic Monitoring ◽  
Southern California Bight ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic
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