Lagenorhynchus


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Lagenorhynchus

 

a genus of dolphins of the suborder Odontoceti (toothed whales). The body measures from 1.8 to 3 m long. The head is foreshortened. The beak is short and poorly demarcated from the frontal-nasal cushion. The upper and lower edges of the caudal stem are high and in the shape of a crest. The dorsal fin is sickle-shaped and deeply notched. The animal has between 90 and 160 teeth. Most species are black and white in color.

There are six species, three of which are found in the waters of the USSR: the white-sided dolphin (L. acutus) and white-beaked dolphin {L. albirostris), which live in the North Atlantic, and the Pacific white-sided dolphin (L. obliquidens), which is found in the North Pacific.

REFERENCES

Tomilin, A. G. Kitoobraznye. Moscow, 1957. (Zveri SSSR i prilezhashchikh stran, vol. 9.)
Zhizn’zhivotnykh, vol. 6. Moscow, 1971.
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In species where the reproductive period is restricted for a few months, as with the dusky dolphin (Lagenorhynchus obscurus) and the harbor porpoise (Phocoena phocoena), the testes weight presents marked fluctuations accompanying the reproductive period (Read, 1990; van Waerebeek and Read, 1994; Neimanis et al., 2000).
Common name Scientific name Vaquita Phocoena sinus Chilean dolphin Cephalorhynchus eutropia Hector's dolphin Cephalorhynchus hectori Commerson's dolphin Cephalorhynchus Commersoni Heaviside's dolphin Cephalorhynchus heavisidii Peale's dolphin Lagenorhynchus australis Finless porpoise Neophocoena phocaenoides Indo-Pacific humpbacked Sousa chinensis dolphins Burmeister's porpoise Phocoena spinipinnis Franciscana Pontoporia blainvillei Indus river dolphin Platanista minor Ganges river dolphin Platanista gangetica Boto Inia geoffrensis Tucuxi Sotalia fluviatilus Common name Habitat Vaquita Northern Gulf of California Chilean dolphin Inshore coastal Chile Hector's dolphin Inshore coastal New Zealand Commerson's dolphin Inshore coastal Chile, Argentina, Falkland Is, Kerguelen Is.
Pacific White-sided Dolphin (Lagenorhynchus obliquidens; hereafter PWSD) distribution in the eastern North Pacific Ocean has been described as ranging from 20 to 61[degrees]N latitude, including all pelagic waters, shelf and slope waters, and coastal and inland waters from the mouth of the Gulf of California to the Gulf of Alaska (Scheffer and Slipp 1948; McTaggart-Cowan and Guiguet 1965; Daugherty 1965; Rice and Scheffer 1968; Consiglieri and others 1982; Leatherwood and others 1984; Stacy and Baird 1991; Dahlheim and Towell 1994; Rice 1998; Morton 2000).
The trachea of the boto and tucuxi is conical and wide, similar to those found in other odontocetes, as Platanista gangetica and Pontoporia blainvillei (Kida) and Lagenorhynchus acutus (Moore et al., 2014).
In South America, along the Patagonian coast of Peninsula Valdes, Argentina, killer whales prey mainly on South American sea lions (Otaria flavescens) and southern elephant seals (Mirounga leonina) (Thomas and Taber, 1984; Lopez and Lopez, 1985; Hoelzel 1991; Bastida et al., 2007), although attacks to southern right whales (Eubalaena australis) (Harris and Garcia, 1986; Jefferson et al., 1991; Sironi et al., 2008), dusky dolphins (Lagenorhynchus obscurus) and common dolphins (Delphinus delphis) have been reported (Coscarella et al., 2015).
Choking on prey has also been reported for other wild cetacean species such as long-finned pilot whales, Globicephala melas ((IJsseldijk et al, 2015); harbor porpoise, Phocoena phocoena (Orr, 1937; Scheffer and Slipp, 1948; Scheffer, 1953; Hult et al, 1980); Pacific white-sided dolphins, Lagenorhynchus obliquidens (Houck, 1961); short-beaked common dolphin, Delphinus delphis (Krivokhizhin and Birkun, 1991); Atlantic spotted dolphin, Stenella frontalis (Mignucci-Giannoni, 1996); whitebeak dolphin, L.
truncatus and Lagenorhynchus obliquidens, which had skin granulomas and yeast-like cells in infected tissues.
Short notes on seabird associations with Dusky dolphins (Lagenorhynchus obscurus) at Kai Kouraand with Orca (Orcinus orca) at Nelson, New Zealand.
The PDO index was selected as a predictor for Dali's porpoise and Pacific white-sided (Lagenorhynchus obliquidens), common, and bottlenose (Tursiops truncatus) dolphins.
The second vessel was a 5.5m rigid-hull inflatable vessel used for a study on dusky dolphins (Lagenorhynchus obscurus).
Por ejemplo, se ha asociado el cambio de temperatura del mar en el SCC durante las ultimas decadas con una reduccion considerable del delfin de costados blancos (Lagenorhynchus obliquidens) en el limite sur de su distribucion (Golfo de California), pero su ocurrencia se incremento en la costa oeste de Canada, sin que hubiera un cambio evidente en sus recursos alimenticios (Salvadeo et al., 2010).
Risso's dolphin (Grampus griseus), Dall's porpoise (Phocoenoides dalli), Pacific white-sided dolphin (Lagenorhynchus obliquidens), gray whales (Eschrichtius robustus), blue whales (Balaenoptera musculus), minke (Balaenoptera acutorostrata), humpback (Megaptera novaeangliae) whales, fin whales (Balaenoptera physalus), northern right whale dolphins (Lissodelphis borealis) and killer whales (Orcinus orca) were sighted occasionally or during their migrations.