Thursday, May 10, 2012

Life of Short Finned Pilot Whale

 
Life of Sea | Short Finned Pilot Whale (Globicephala macrorhynchus) | Short finned pilot whale is one of the two cetacean species in the genus Globicephala. They prefer warmer tropical and temperate waters and is found at different distances from the coast, but mostly in deeper waters. Areas with a high density of squid, their primary foraging habitats. Only Short finned pilot whales are thought to inhabit the North Pacific, although distribution and taxonomy of whales in this area are still largely unresolved. There are two geographical forms of short-finned pilot whale in Japan. They occur in the Red Sea, but not the Mediterranean.

 
Scientific classification
Kingdom:     Animalia
Phylum:     Chordata
Class:     Mammalia
Order:     Cetacea
Family:     Delphinidae
Genus:     Globicephala
Species:     G. macrorhynchus
 

Short finned pilot whales have a bulbous melon head with no discernable beak. The dorsal fin is far forward on the body and a relatively long base. Body color is black or dark brown with a large gray saddle behind the dorsal fin. They are polygynous (males have more than one partner) and are often found in groups with a ratio of one adult male to about every eight mature females. Males generally leave their birth school, while females may remain in theirs throughout their lifetime. 

 
In the eastern Pacific, are short-finned pilot whales associated with other species (such as bottlenose dolphins, Pacific white-sided, common, and Risso's dolphins and sperm whales). Pods of up to several hundred Short finned pilot whales are seen, and members of this highly social species are almost never seen. Strong social ties may partially explain why pilot whales are among the species of cetaceans that most mass-strand. Although detailed studies of the behavior have only recently started, pilot whales seem to live in relatively stable parent groups. 

 
Short finned pilot whales often come in groups of 25 to 50 animals.They are sometimes seen logging and will come very close to boats. They rarely break, but can be seen lobtailing (hitting their tail on the water) and spyhopping (stabbing their heads above the surface). For diving, they bowed their tails and bring them above the surface. When you get to the surface to breathe, adults tend to have only the tops of their heads to show that the calves their entire head to throw from the water. Adult every now and then Bruinvis (lift the major part of the body out of the water), while swimming in the extremely fast. They are known as the 'Cheetahs of the Deep "for the high speed pursuits of the squid at a depth of several hundred meters. They feed mainly on squid, but they can also feed on squid and fish, all of moderately deep water of 1000 feet (305 m) or more. If they swim and probably looking for food, pilot whales are grades may have more than one kilometer. 

 
Short finned pilot whales were immediately slain in drive fisheries in Japan and the harpoon fisheries in the Caribbean and Indonesia. This species is also considered as by catch in several fisheries in the North Pacific, including driftnet fishery become jellyfish and sharks. At least in the past, they have also taken incidentally in the squid purse seine fishery that operates outside the Cailfornia coast. Several Short finned pilot whales have been captured for public display and research in the U.S. and Japan. There are no estimates of global abundance, but some estimates for specific areas to exist.

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1 komentar

Aleksei Molodtcov February 19, 2016 at 9:19 AM

Hmmm dolfin eat the jellyfish, very interesting...

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