Examples of this bias are species of commercial interest and iconic or flagship species, preferred for their heavy body weight (e.g., mysticetes
, proboscideans, large cats, etc.) or positive public perception (e.g., odontocetes, primates, phocids, Cardoso et al., 2011b).
Baleen whales, or Mysticetes
, split from their toothed cousins, Odontocetes, about 34 million years ago, and researchers analyzed a whale skull from around that time, recovered from Antarctica.
Felix Marx has worked primarily on the fossil record of the earliest baleen whales (mysticetes
), while Olivier Lambert has studied principally the fossils of extinct toothed whales (odontocetes).
During the survey, 23 cetacean species (17 odontocetes and 6 mysticetes
) were seen, and abundance was estimated for 19 of them (15 odontocetes and 4 mysticetes
Baleen whales, also known as mysticetes
, are the largest animals on earth, and include blue whales, minke whales, right whales, gray whales and fin whales, Khaleej Times reported.
Social and behavioural factors in cetacean responses to overexploitation: are odontocetes less "resilient" than mysticetes
Physiological adaptations enhance the breath holding capacity of mysticetes
, however in young mysticetes
, the breath holding capacity is limited.
He adds, Eoe1/4EoWhales and dolphins can be split into two groups, whales with teeth, called toothed whales or odontocetes, and whales with baleen instead of teeth called baleen whales or mysticetes
. 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 ...
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).
were represented only by three species members of the family Balaenopteridae that with the exception of Megaptera novaeangliae may inhabit primarily oceanic waters.
By contrast, the mysticetes
(members of the group Mysticeti) have no teeth but possess large, specialized plates made from a horny substance known as baleen.