Weishampel, D. B. (1981). Acoustic analyses of potential vocalization in lambeosaurine dinosaurs (Reptilia: Ornithischia). Paleobiology, 7(2), 252-261.
Notes/Summary: This covers the Wiman paper in the context section. Of interest is the comparison between parasaurolophus skulls and the krumlur and as well as the trumpeter and whistling swans. Weishampel speculates a vocal organ between the phranx and the lungs would make the nasal passages work well as a resonator. This is in a similar place to trumpeter swan.
L = n(λ/2)
n = resonance mode
L - tube length
f = n(v/2L)
The soft tissues in Corythosaurus and Lambeosaurus likely changed the contours of the nasal passages more than Parasaurolophus, and thus, the sounds.
Other animals have resonating chambers in their skull similar to the lateral diverticula of Corythosaurus and Lambeosaurus such as some crocodiles, dolphins, microchiropteran bats, and howler monkeys.
He also addressed the ear and hearing ranges, which was covered in more depth in the more recent Evans & Witmer paper.
No comments:
Post a Comment