AskDefine | Define cetacean

Dictionary Definition

cetacean adj : of or relating to whales and dolphins etc [syn: cetaceous] n : large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales; dolphins; porpoises; narwhals [syn: cetacean mammal, blower]

User Contributed Dictionary

English

Etymology

New Latin cetacea, from cetus.

Pronunciation

/sɪˈteɪʃən/

Adjective

  1. Pertaining to the zoologic order Cetacea, or associated with species falling under that taxonomic hierarchy.
    The poached blubber was definitely cetacean in origin, but the particular species could not be identified.
  2. More generally, relating to large aquatic mammals, either directly or by analogy.
    The obese woman, ungainly on land, moved with a kind of cetacean grace in the water.

Synonyms

Noun

  1. An animal belonging to the order Cetacea, including dolphins, porpoises, and whales.
    The tour promised spiritual experiences with humpback whales and other cetaceans, but all we saw were seagulls and a dead sea otter.

Translations

Extensive Definition

Cetacea can also refer to a song by Icelandic singer Björk.
The order Cetacea (, L. cetus, whale) includes whales, dolphins and porpoises. Cetus is Latin and is used in biological names to mean "whale"; its original meaning, "large sea animal," was more general. It comes from Ancient Greek κῆτος (kētos), meaning "whale" or "any huge fish or sea monster". Cetology is the branch of marine science associated with the study of cetaceans.
Cetaceans are the mammals most fully adapted to aquatic life. Their body is fusiform (spindle-shaped). The forelimbs are modified into flippers. The tiny hindlimbs are vestigial; they do not attach to the backbone and are hidden within the body. The tail has horizontal flukes. Cetaceans are nearly hairless, and are insulated by a thick layer of blubber. As a group, they are noted for their high intelligence.
The order Cetacea contains ninety species, all marine except for five species of freshwater dolphins. The order is divided into two suborders, Mysticeti (baleen whales) and Odontoceti (toothed whales, which includes dolphins and porpoises).

Respiration, vision, hearing and echolocation

As mammals, cetaceans need to breathe air. Because of this, they need to come to the water's surface to exhale carbon dioxide and inhale a fresh supply of oxygen. During diving, a muscular action closes the blowholes (nostrils), which remain closed until the cetacean next breaks the surface; when it surfaces, the muscles open the blowholes and warm air is exhaled.
Cetaceans' blowholes have evolved to a position on top of the head, allowing more time to expel stale air and inhale fresh air. When the stale air, warmed from the lungs, is exhaled, it condenses as it meets the cold air outside. As with a terrestrial mammal breathing out on a cold day, a small cloud of 'steam' appears. This is called the 'blow' or 'spout' and is different in terms of shape, angle and height, for each cetacean species. Cetaceans can be identified at a distance, using this characteristic, by experienced whalers or whale-watchers.
Cetaceans can go underwater for much longer periods of time than other mammals. Their duration under water varies greatly between speicies due to large physiological differences between many members of this Order. There are two studied advantages of cetacean physiology that let this Order (and other marine mammals) forage underwater for extended periods of time without breathing at the water surface.
Myoglobin concentrations in skeletal muscle of mammals have much variation. A New Zealand white rabbit has 0.08+/-0.06 g (in a 100 g Wet muscle) of myoglobin, whereas a Northern bottlenose whale has 6.34 g (in a 100 g Wet muscle) of myoglobin. Myoglobin, by nature, has a higher affinity to oxygen than haemoglobin. That is, myoglobin retains oxygen molecules better than hemoglobin. Therefore, it is useful to have higher concentrations of myoglobin when needed and there is no oxygen available for re-uptake. The higher the myoglobin concentration in cetacean skeletal muscle, the longer they can stay underwater and forage.
Increased body size is another way of elongating dive duration of large cetaceans. This is true because of two considered aspects. An increase in body size means that there is increase in muscle mass, therefore, increase in muscle oxygen stores. Another aspect is the universal correlation of mass and metabolic rate (Kleiber's law). In layman’s terms Kleiber’s law states that the metabolic rate of a large animal is slower than a small animal per unit mass. From this we can conclude that larger animals will use up less oxygen than smaller animals (per mass unit).
The cetacean's eyes are set well back and to either side of its huge head. This means that cetaceans with pointed 'beaks' (such as dolphins) have good binocular vision forward and downward but others, with blunt heads (such as the Sperm Whale), can see either side but not directly ahead or directly behind. Tear glands secrete greasy tears, which protect the eyes from the salt in the water. Cetaceans also have an almost spherical lens in their eyes, which is most efficient at focusing what little light there is in the deep waters. Cetaceans make up for their generally quite poor vision (with the exception of the dolphin) with excellent hearing.
As with the eyes, the cetacean's ears are also small. Life in the sea accounts for the cetacean's loss of its external ears, whose function is to collect airborne sound waves and focus them in order for them to become strong enough to hear well. However, water is a better conductor of sound than air, so the external ear was no longer needed: It is no more than a tiny hole in the skin, just behind the eye. The inner ear, however, has become so well developed that the cetacean can not only hear sounds dozens of miles away, but it can also discern from which direction the sound comes.
Some cetaceans are capable of echolocation. Many toothed whales emit clicks similar to those in echolocation, but it has not been demonstrated that they echolocate. Mysticeti have little need of echolocation, as they prey upon small fish that would be impractical to locate with echolocation. Some members of Odontoceti, such as dolphins and porpoises, do perform echolocation. These cetaceans use sound in the same way as bats - they emit a sound (called a click), which then bounces off an object and returns to them. From this, cetaceans can discern the size, shape, surface characteristics and movement of the object, as well as how far away it is. With this ability cetaceans can search for, chase and catch fast-swimming prey in total darkness. Echolocation is so advanced in most Odontoceti that they can distinguish between prey and non-prey (such as humans or boats); captive cetaceans can be trained to distinguish between, for example, balls of different sizes or shapes.
Cetaceans also use sound to communicate, whether it be groans, moans, whistles, clicks or the complex 'singing' of the Humpback Whale.

Feeding

When it comes to food and feeding, cetaceans can be separated into two distinct groups. The toothed whales, Odontoceti like sperm whales, beluga whales, dolphins and porpoises, usually have lots of teeth that they use for catching fish, squid or other marine life. They do not chew their food, but swallow it whole. In the rare cases that they catch large prey, as when Orca (Orcinus orca) catch a seal, they tear chunks off it that in turn are swallowed whole.
The baleen whales or Mysticeti do not have teeth. Instead they have plates made of keratin (the same substance as human fingernails) which hang down from the upper jaw. These plates act like a giant filter, straining small animals (such as krill and fish) from the seawater. Cetaceans included in this group include the Blue Whale, the Humpback Whale, the Bowhead Whale and the Minke Whale.
Not all Mysticeti feed on plankton: the larger whales tend to eat small shoaling fish, such as herrings and sardine, called micronecton. One species of Mysticeti, the Gray Whale (Eschrichtius robustus), is a benthic feeder, primarily eating sea floor crustaceans.

Mammalian nature

Cetaceans are mammals, that is, members of the class Mammalia. The closest living relative of cetaceans is the hippopotamus.
As mammals, cetaceans have characteristics that are common to all mammals: They are warm-blooded, breathe in air through their lungs, bear their young alive and suckle them on their own milk, and have hair, although very little of it.
Another way of discerning a cetacean from a fish is by the shape of the tail. The tail of a fish is vertical and moves from side to side when the fish swims. The tail of a cetacean – called a fluke – is horizontal and moves up and down, as cetaceans' spines bend in the same manner as a human spine.

Taxonomic listing

The classification here closely follows Dale W. Rice, Marine Mammals of the World: Systematics and Distribution (1998), which has become the standard taxonomy reference in the field. There is very close agreement between this classification and that of Mammal Species of the World: 3rd Edition (Wilson and Reeder eds., 2005). Any differences are noted using the abbreviations "Rice" and "MSW3" respectively. Further differences due to recent discoveries are also noted.
Discussion of synonyms and subspecies are relegated to the relevant genus and species articles.
†Extinct

References

cetacean in Min Nan: Cetacea
cetacean in Arabic: حيتانيات
cetacean in Bulgarian: Китоподобни
cetacean in Catalan: Cetaci
cetacean in Czech: Kytovci
cetacean in Danish: Hvaler
cetacean in German: Wale
cetacean in Estonian: Vaalalised
cetacean in Modern Greek (1453-): Κητώδη
cetacean in Spanish: Cetacea
cetacean in Esperanto: Cetacoj
cetacean in Persian: آب‌بازان
cetacean in French: Cetacea
cetacean in Galician: Cetáceo
cetacean in Korean: 고래
cetacean in Hindi: व्हेल
cetacean in Croatian: Kitovi
cetacean in Indonesian: Cetacea
cetacean in Icelandic: Hvalir
cetacean in Italian: Cetacea
cetacean in Hebrew: לווייתנאים
cetacean in Latin: Cetacea
cetacean in Lithuanian: Banginiai
cetacean in Limburgan: Walvèsechtege
cetacean in Hungarian: Cetek
cetacean in Malay (macrolanguage): Ikan paus
cetacean in Dutch: Walvissen
cetacean in Japanese: クジラ目
cetacean in Norwegian: Hvaler
cetacean in Norwegian Nynorsk: Kvalar
cetacean in Polish: Walenie
cetacean in Portuguese: Cetáceos
cetacean in Romanian: Cetaceu
cetacean in Russian: Китообразные
cetacean in Sicilian: Citacea
cetacean in Simple English: Cetacea
cetacean in Slovak: Veľryby (rad)
cetacean in Slovenian: Kiti
cetacean in Serbian: Китови
cetacean in Finnish: Valaat
cetacean in Swedish: Valar
cetacean in Thai: อันดับวาฬและโลมา
cetacean in Turkish: Balinalar
cetacean in Contenese: 鯨魚
cetacean in Chinese: 鯨目

Synonyms, Antonyms and Related Words

Loch Ness monster, alevin, baleen whale, beluga, benthon, benthos, blackfish, blue whale, cachalot, dolphin, finback, fingerling, fish, fry, game fish, grilse, humpback, killer, killer whale, kipper, man-eater, man-eating shark, marine animal, minnow, minny, narwhal, nekton, panfish, plankton, porpoise, salmon, sea monster, sea pig, sea serpent, sea snake, shark, smolt, sperm whale, sponge, sulfur-bottom whale, tropical fish, whale
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