Premilinary results of the effects of SURTASS-LFA sonar on singing humpback whales
Miller, Patrick J. O.
Tyack, Peter L.
MetadataShow full item record
The singing behavior of humpback whales exposed to SURTASS-LFA sonar was monitored in Hawaii during March 1998. An observation vessel towing a hydrophone array followed individual singers continuously recording their songs and the received level of sonar near the whale. At least 2 complete songs were recorded before commencing a 60min 42s long playback, which consisted of ten 42s signals transmitted every 6 min. by a U.S. Navy vessel. Observations continued into the post-exposure period. Song spectrograms were broken into themes and phrases using visual analysis and aurol scoring. 23 focal follows were conducted; 5 were control follows with no playback. In 9 follows the whale sang throughout the playback, in 4 the whale stopped singing when it joined another whale and in 5 it stopped presumably in response to the playback. We recorded at least one complete song in all three experimental conditions from six individuals. These singers sang longer sonsgs during (13.75min) than before (10.68min) or after (10.58min) the playback (model III ANOVA, p=0.047, n=6). No differences were found in theme order. Song cessation and song duration responses did not scale with sonar received level. High variability in individual responses may indicate that some males were more sensitive to the sonar than others.
Showing items related by title, author, creator and subject.
Watkins, William A.; Daher, Mary Ann; George, Joseph E.; Haga, Scott H. (Woods Hole Oceanographic Institution, 2000-12)The seasonal distribution of calling ble whales (Balaenoptera musculus), fin whales (B. physalus), and singing humpback whales (Megaptera novaeangliae) has been analyzed from acoustic data recorded by the U.S. Navy Sound ...
Evidence of resource partitioning between humpback and minke whales around the western Antarctic Peninsula Friedlaender, Ari S.; Lawson, Gareth L.; Halpin, Patrick N. (2008-09-20)For closely related sympatric species to coexist, they must differ to some degree in their ecological requirements or niches (e.g., diets) to avoid inter-specific competition. Baleen whales in the Antarctic feed primarily ...
Diel changes in humpback whale Megaptera novaeangliae feeding behavior in response to sand lance Ammodytes spp. behavior and distribution Friedlaender, Ari S.; Hazen, Elliott L.; Nowacek, Douglas P.; Halpin, Patrick N.; Ware, Colin; Weinrich, Mason T.; Hurst, Thomas P.; Wiley, David N. (Inter-Research, 2009-12-03)Humpback whales Megaptera novaeangliae have adopted unique feeding strategies to take advantage of behavioral changes in their prey. However, logistical constraints have largely limited ecological analyses of these ...