... depending on the environment, thus highlighting context as an important factor to consider in addition to range-dependent biosonar adjustments. Echolocation Interclick interval Phocoena phocoena Source level Target range Toothed whale Efficient biosonar operation requires that the source...

...Arnoldus Schytte Blix; Lars Walløe; Edward B. Messelt SUMMARY Whales are unique in that the supply of blood to the brain is not by the internal carotid arteries, but by way of thoracic and intra-vertebral arterial retia. We found in the harbor porpoise ( Phocoena phocoena ) that these retia split...

...; random effect (task):variance=3.0×10 –11 ;residual=6.1×10 –2 ; Table 1 ]. * Author for correspondence (e-mail: ursula.verfuss@meeresmuseum.de ) 11 12 2008 2009 harbour porpoise Phocoena phocoena biosonar echolocation foraging behaviour signal pattern Biosonar...

...Anne Villadsgaard; Magnus Wahlberg; Jakob Tougaard SUMMARY Field recordings of harbour porpoises (Phocoena phocoena) were made in the inner Danish waters with a vertical array of three or four hydrophones. The back-calculated source level ranged from 178 to 205 dB re 1μPa pp @ 1 m with a mean...

... on the surface of the forehead of two harbor porpoises ( Phocoena phocoena ). It has long been hypothesized that the special lipids found in the melon of odontocetes, and not in any other mammals, focus sounds produced in the nasal region that then propagate through the melon, producing a beam...

... , 797 -801. Amundin, M. ( 1991 ). Helium effects on the click frequency spectrum of the harbour porpoise, Phocoena phocoena. J. Acoust. Soc. Am. 90 , 53 -59. Amundin, M. and Andersen, S. H. ( 1983 ). Bony nares air pressure and nasal plug muscle activity during click production...