|Abstract or Summary
- Traditional visual survey methods for marine mammals can only detect a fraction of the animals present. Even if the animal can be observed from the surface, visual limitations such as time of day and weather conditions can impede this ability. Recent advances in passive acoustic monitoring technologies have led to the development of mobile autonomous platforms for recording marine mammals. These instruments may allow for improved monitoring of species presence through greater spatial and temporal sampling capabilities. We deployed two types of commercially available platforms in the Catalina Basin in late July through early August 2016. The QUEphone, based on the APEX float (Teledyne Webb Research, Falmouth, MA, USA), is a buoyancy-driven device that dove to 1,000 m where it drifted horizontally with the currents. The Seaglider (Kongsberg Underwater Technology, Lynwood, WA, USA) is also buoyancy-driven, but repeatedly dove down to 1000 m and traversed back and forth across the survey area. Using MATLAB based software Triton, (Scripps Whale Acoustics Laboratory, La Jolla, CA), and Raven (Cornell Lab of Ornithology, Ithaca, NY) programs, I analyzed the acoustic data both visually and aurally using long term spectrogram analysis. The most prevalent species were unidentified delphinids, with 240 of 313 hours containing calls. Marine mammal detections also included unidentified otariid, Risso’s dolphins, and blue, humpback, minke, and Cuvier’s beaked whales. These data will be used to compare the detection capabilities of the QUEphone and Seaglider, contributing to the advancement of the use of these instruments in marine mammal surveys.