These authors suggest that the spiral format of these rings is related to evolutionary issues in the different species of odontocete
cetaceans, such as an adaptation to withstand pressure while diving.
Although that recent research has provided significant insight into the occurrence, distribution, abundance, stock structure, and social organization of cetaceans in Hawaii waters, the surveys were focused primarily on near-shore odontocete
species associated with the main Hawaiian Islands.
Sounds below 1 kHz (typical of mysticete calls) have significantly less seawater absorption loss than sounds above 10 kHz (typical of odontocete
calls) and thus can be detected at greater distances (Mellinger et al.
Over 80% of odontocete
species and two baleen whale species regularly include cephalopods in their diets (Clarke, 1996).
It is thought that the maximum annual increase for an odontocete
cetacean with a life history such as a beluga whale is unlikely to be much greater than about 1.
Studies on feeding habits and dietary analytical methods for smaller odontocete
species along the southern African coast [dissertation].
2000: The world's oldest known odontocete
The results of this research were recently published in a PLoS ONE article entitled, "A New Acoustic Portal into the Odontocete
Ear and Vibrational Analysis of the Tympanoperiotic Complex".
According to Heithaus (2001), to understand group sizes and habitat use of dolphins, it is important to understand the relative risk to an individual odontocete
from predators, particularly sharks, in different habitats.
Concentrations of PCBs as high as 300 [micro]g/g (lipid weight basis) have been recorded in odontocete
blubber (Ross et al.
Another familiar odontocete
is the killer whale (Orcinus orca)--the largest living predator of warm-blooded animals.
Max Friesen 1996 "An odontocete
(Cetacea) meat utility index," Journal of Archaeological Science 23:713-721.