was initiated. An autonomous recording pack-age approach has the advantage over real-time monitored systems because of its lower instal-lation and personnel costs. Autonomous instru-ments can be deployed for long time periods (up to one year) in remote locations. Computer software can be used to det...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.694.8577 http://cetus.ucsd.edu/Publications/Publications/WigginsMTS2003.pdf |
| Summary: | was initiated. An autonomous recording pack-age approach has the advantage over real-time monitored systems because of its lower instal-lation and personnel costs. Autonomous instru-ments can be deployed for long time periods (up to one year) in remote locations. Computer software can be used to detect calls automati-cally by scanning the acoustic data after instru-ment recovery. An ARP consists of a frame that rests on the seafloor and a hydrophone teth-ered above the frame (Figures 1 and 2). The frame contains the buoyancy needed for recov-ery, ballast weights for deployment, and pres-sure cases for batteries and ballast release and data logger electronics. ARPs have been config-ured to record up to 1 kHz sample rate continu-ously for more than one year. At these sample rates, calling baleen whales are recorded, but not higher-frequency-calling odontocetes (toothed whales). By June 2000, four months after project initiation, an ARP had been deployed and recorded its first baleen whale call. Since then, 25 ARPs have been fabricated and deployed in both shallow and deep water at a variety of locations including: the Bering Sea off the coast of Alaska, near San Clemente Island off the southern California coast, off the |
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