Time intervals between clicks in echolocation click trains, termed inter-click intervals (ICI), have been used as a behavioral indicator in several odontocetes
, including harbor porpoise (DeRuiter et al.
Although sperm whales were most abundant during the summer-fall surveys in deep water, 158 individuals (CV=0.
Generally, mysticetes like blue whales vocalise using lower frequencies creating sounds which can travel over large distances and odontocetes
vocalise using higher frequencies, such as clicking sounds produced by dolphins and sperm whales to echolocate (using sound to Eoe1/4Y[pounds sterling]seeEoe1/4ao .
The ecology of lobomycosis in humans and odontocetes
seems to be unconnected.
Mysticeti and odontocetes
have also shown changes in behavior and vocalization patters such as disruption of foraging, avoidance of particular areas, altered dive and respiratory patterns, and disruption of mating systems (Gordon et al.
Among marine mammals, odontocetes
(toothed whales), including beluga, may be at the greatest risk of contaminant effects because these animals are top predators that accumulate contaminants to a higher degree than do mysticetes (baleen whales) (O'Shea and Brownell 1994).
Taxonomists divide living whales and dolphins into two suborders: the Odontocetes
, which have teeth, and the Mysticeres, whose mouths have banks of comb-like baleen used to filter small fish and crustaceans from the water.
2007) as well as other odontocetes
, leading to speculation that odontocetes
in general may have difficulty recovering from over exploitation (Wade et al.
Annual trends were assessed by using a simple linear regression (SAS PROC REG) for the following taxonomic groups: balaenopterids, pygmy sperm whales (Kogia breviceps); dwarf sperm whales (Kogia sima); harbor porpoises; harbor seals (Phoca vitulina); non-Phoca pinnipeds; non-Kogia pelagic odontocetes
(delphinids except coastal bottlenose dolphins, ziphiids, and sperm whales [Physeter macrocephalus]), and the coastal bottlenose dolphin categories mentioned previously, including coastal and inshore strandings.
coeruleoalba; the other 16 comprised 11 species of odontocetes
These results show interesting parallels with white-sided dolphins (Lagenorhynchus acutus) and short-beaked common dolphins along the continental shelf of northeastern United States (Selzer and Payne 1988), and various odontocetes
near a submarine canyon on the Scotian Shelf (Gowans and Whitehead 1995).
Neoplasia was not observed in 86 small odontocetes
stranded on the Oregon and California shoreline (20,21).