We conducted aerial surveys in September 1984 and September and October 1985 to determine the abu... more We conducted aerial surveys in September 1984 and September and October 1985 to determine the abun dance of harbor porpoise along the coasts of California, Oregon, and Washington. Two observers and a recorder searched along predetermined transect lines at 0.61 and 1.85 km offshore. Strip transect methods were used. A total of 366 groups of harbor porpoise were seen in
The Journal of the Acoustical Society of America, 2007
Vocalizations from the northern right whale dolphin, Lissodelphis borealis, were recorded during ... more Vocalizations from the northern right whale dolphin, Lissodelphis borealis, were recorded during a combined visual and acoustic shipboard survey of cetacean populations off the west coast of the United States. Seven of twenty single-species schools of L. borealis produced click and pulsed vocalizations. No whistles were detected during any of the encounters. Clicks associated with burst-pulse vocalizations were lower in frequency and shorter in duration than clicks associated with echolocation. All burst-pulse sounds were produced in a series containing 6-18 individual burst-pulses. These burst-pulse series were stereotyped and repeated. A total of eight unique burst-pulse series were detected. Variation in the temporal characteristics of like units compared across repeated series was less than variation among all burst-pulses. These stereotyped burst-pulse series may play a similar communicative role as do stereotyped whistles found in other delphinid species.
1.1 Background The new section 117 of the Marine Mammal Protection Act as amended in 1994 (MMPA) ... more 1.1 Background The new section 117 of the Marine Mammal Protection Act as amended in 1994 (MMPA) requires the National Marine Fisheries Service (NMFS) and the US Fish and Wildlife Service (FWS) to prepare, in consultation with regional Scientific Review Groups, ...
We conducted aerial surveys in September 1984 and September and October 1985 to determine the abu... more We conducted aerial surveys in September 1984 and September and October 1985 to determine the abun dance of harbor porpoise along the coasts of California, Oregon, and Washington. Two observers and a recorder searched along predetermined transect lines at 0.61 and 1.85 km offshore. Strip transect methods were used. A total of 366 groups of harbor porpoise were seen in
The Journal of the Acoustical Society of America, 2007
Vocalizations from the northern right whale dolphin, Lissodelphis borealis, were recorded during ... more Vocalizations from the northern right whale dolphin, Lissodelphis borealis, were recorded during a combined visual and acoustic shipboard survey of cetacean populations off the west coast of the United States. Seven of twenty single-species schools of L. borealis produced click and pulsed vocalizations. No whistles were detected during any of the encounters. Clicks associated with burst-pulse vocalizations were lower in frequency and shorter in duration than clicks associated with echolocation. All burst-pulse sounds were produced in a series containing 6-18 individual burst-pulses. These burst-pulse series were stereotyped and repeated. A total of eight unique burst-pulse series were detected. Variation in the temporal characteristics of like units compared across repeated series was less than variation among all burst-pulses. These stereotyped burst-pulse series may play a similar communicative role as do stereotyped whistles found in other delphinid species.
1.1 Background The new section 117 of the Marine Mammal Protection Act as amended in 1994 (MMPA) ... more 1.1 Background The new section 117 of the Marine Mammal Protection Act as amended in 1994 (MMPA) requires the National Marine Fisheries Service (NMFS) and the US Fish and Wildlife Service (FWS) to prepare, in consultation with regional Scientific Review Groups, ...
Uploads
Papers by Jay Barlow