scholarly journals Passive acoustic monitoring off Vancouver Island reveals extensive use by at-risk Resident killer whale (Orcinus orca) populations

2019 ◽  
Vol 39 ◽  
pp. 221-234 ◽  
Author(s):  
A Riera ◽  
JF Pilkington ◽  
JKB Ford ◽  
EH Stredulinsky ◽  
NR Chapman
Keyword(s):  
At Risk ◽  
Killer Whale ◽  
Acoustic Monitoring ◽  
Vancouver Island ◽  
Orcinus Orca ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic

Determining killer whale (Orcinus orca) call variability from passive acoustic monitoring in the Chukchi and Bering Sea, Alaska

2016 ◽  
Vol 140 (4) ◽  
pp. 3415-3416
Author(s):  
Brijonnay C. Madrigal ◽  
Catherine L. Berchok ◽  
Jessica L. Crance ◽  
Alison K. Stimpert
Keyword(s):  
Bering Sea ◽  
Killer Whale ◽  
Acoustic Monitoring ◽  
Orcinus Orca ◽  
Passive Acoustic Monitoring ◽  
Passive Acoustic

scholarly journals Passive acoustic monitoring of killer whales (Orcinus orca) reveals year-round distribution and residency patterns in the Gulf of Alaska

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hannah J. Myers ◽  
Daniel W. Olsen ◽  
Craig O. Matkin ◽  
Lara A. Horstmann ◽  
Brenda Konar
Keyword(s):  
Killer Whale ◽  
Marine Ecosystem ◽  
Distribution Patterns ◽  
Gulf Of Alaska ◽  
Acoustic Monitoring ◽  
Orcinus Orca ◽  
Killer Whales ◽  
Passive Acoustic Monitoring ◽  
The North ◽  
Passive Acoustic

AbstractKiller whales (Orcinus orca) are top predators throughout the world’s oceans. In the North Pacific, the species is divided into three ecotypes—resident (fish-eating), transient (mammal-eating), and offshore (largely shark-eating)—that are genetically and acoustically distinct and have unique roles in the marine ecosystem. In this study, we examined the year-round distribution of killer whales in the northern Gulf of Alaska from 2016 to 2020 using passive acoustic monitoring. We further described the daily acoustic residency patterns of three killer whale populations (southern Alaska residents, Gulf of Alaska transients, and AT1 transients) for one year of these data. Highest year-round acoustic presence occurred in Montague Strait, with strong seasonal patterns in Hinchinbrook Entrance and Resurrection Bay. Daily acoustic residency times for the southern Alaska residents paralleled seasonal distribution patterns. The majority of Gulf of Alaska transient detections occurred in Hinchinbrook Entrance in spring. The depleted AT1 transient killer whale population was most often identified in Montague Strait. Passive acoustic monitoring revealed that both resident and transient killer whales used these areas much more extensively than previously known and provided novel insights into high use locations and times for each population. These results may be driven by seasonal foraging opportunities and social factors and have management implications for this species.

scholarly journals Demonstration of subsurface passive acoustic monitoring (SPAM) to survey for and estimate populations of imperiled underwater-calling frogs

2021 ◽  
Author(s):  
Patrick Wolff ◽  
Brett DeGregorio ◽  
Aaron Rice
Keyword(s):  
At Risk ◽  
Survey Methodology ◽  
Acoustic Monitoring ◽  
Leopard Frog ◽  
Calling Behavior ◽  
Passive Acoustic Monitoring ◽  
Anuran Species ◽  
Data Gap ◽  
Passive Acoustic ◽  
Validation Experiments

The management and recovery of threatened and endangered amphibians on Department of Defense (DoD) lands relies on an understanding of their distribution and abundance. Fortunately, most anuran species can be surveyed acoustically using vocalizations during the breeding season. This work demonstrated the use of subsurface passive acoustic monitoring (SPAM) to survey for rare underwater-calling, at-risk anuran species on DoD installations. We evaluated the performance of SPAM relative to traditional passive acoustic monitoring (PAM) (microphone) and human manual calling survey (MCS) methods. Results showed that SPAM outperformed PAM and MCS in validation experiments where calls were generated underwater; SPAM was less successful than PAM and MCS in the field demonstration. Most leopard frog calls were apparently produced in air despite previous reports of extensive underwater-calling behavior. This project highlights how acoustic information can help address a data gap in the ecology of at-risk species, which can help refine future survey methodology and management efforts. Ultimately, the utility of SPAM for underwater-calling species will depend on the focal species, the landscape where it occurs, and technological considerations available to the surveyor. SPAM is more expensive than traditional methods but, in some situations, may be the only way to effectively detect species.

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