Lagenodelphis hosei is species of the delphinid family, distinguished from other dolphins as a monotypic genus, Lagenodelphis.[4]
In 1895, Charles E. Hose found a skull on a beach in Sarawak, Borneo. He donated it to the British Museum. The skull remained unstudied until 1956 when Francis Fraser[3][5] examined it and concluded that it was similar to species in both the genera Lagenorhynchus and Delphinus but not the same as either. A new genus was created by simply merging these two names together. The specific name is given in Hose's honour.
It wasn't until 1971 that the whole body of a Fraser's dolphin, as it was by then becoming known, was discovered. At that time washed-up specimens were found on Cocos Island in the eastern Pacific, in South Australia and in South Africa.
Description
Fraser's dolphins are about 1 m (3 ft 3 in) long and 20 kg (44 lb) weight at birth, growing to 2.75 m (9 ft 0 in) and 200 kg (440 lb) by adulthood. They have a stocky build, a small fin in relation to the size of the body, as well as conspicuously small flippers. The dorsal fin and beak are also shorter than other species of dolphin. The upper side is a gray-blue to gray-brown. A dirty cream-colored line runs along the flanks from the beak, above the eye, to the anus. There is a dark stripe under this line. The belly and throat are usually white, sometimes tinged pink. The lack of a prominent beak is a distinguishing characteristic of this dolphin. From a distance, however, it may be confused with the striped dolphin, which has a similar coloration and is found in the same regions.
Fraser's dolphins swim quickly in large, tightly-packed groups, numbering anywhere from 100 to 1,000 in number. Often porpoising, the groups chop up the water tremendously. The sight of seeing a large group fleeing from a fishing vessel has been reported as "very dramatic".
It is also unique in having the smallest genitalia of any open sea dolphin.
The species feeds on pelagic fish, squid and shrimp found some distance below the surface of the water (200 m/660 ft to 500 m/1,600 ft). Virtually no sunlight penetrates this depth, so feeding is carried out using echolocation alone.
Though only accounted for relatively recently, the number of reported sightings has become substantial — indicating that the species may not be as rare as thought as recently as the 1980s. However the species is still not nearly as well understood as its more coastal cousins. No global population estimates exist.
The dolphin is normally sighted in deep tropical waters; between 30°S and 20°N. The Eastern Pacific is the most reliable site for viewings. Groups of stranded dolphins have been found as far afield as France and Uruguay. However these are regarded as anomalous and possibly due to unusual oceanographic conditions, such as El Niño.
The species is also relatively common in the Gulf of Mexico but less so in the rest of the Atlantic Ocean.
The Philippines is particularly known area for dolphin sightings, and is home to one of the larger populations of the Fraser's dolphin in the world.
Conservation
The Southeast Asian populations of Fraser's dolphins are listed on Appendix II [6] of the Convention on the Conservation of Migratory Species of Wild Animals (CMS), since they have an unfavourable conservation status or would benefit significantly from international co-operation organised by tailored agreements.[7]
In addition, Fraser's dolphin is covered by Memorandum of Understanding for the Conservation of Cetaceans and Their Habitats in the Pacific Islands Region (Pacific Cetaceans MoU)[8] and the Memorandum of Understanding Concerning the Conservation of the Manatee and Small Cetaceans of Western Africa and Macaronesia (Western African Aquatic Mammals MoU).[9]
^Kiszka, J.; Braulik, G. (2018). "Lagenodelphis hosei". IUCN Red List of Threatened Species. 2018: e.T11140A50360282. doi:10.2305/IUCN.UK.2018-2.RLTS.T11140A50360282.en. Retrieved 19 November 2021.
^"Appendices | CITES". cites.org. Retrieved 14 January 2022.
^ abLagenodelphis hosei Fraser, F.C. 1956. A new Sarawak dolphin. Sarawak Museum Journal 7(8, ns): 478-503 [478].
^Hershkovitz, P. (1966). "Catalog of living whales". Bulletin of the United States National Museum (246): viii 1-259 [60]. doi:10.5479/si.03629236.246.
^"Appendix II 11 June 2011 at the Wayback Machine" of the Convention on the Conservation of Migratory Species of Wild Animals (CMS). As amended by the Conference of the Parties in 1985, 1988, 1991, 1994, 1997, 1999, 2002, 2005 and 2008. Effective: 5 March 2009.
^. Archived from the original on 15 October 2012. Retrieved 31 August 2011.
Hammond, P.S.; Bearzi, G.; Bjørge, A.; Forney, K.; Karczmarski, L.; Kasuya, T.; Perrin, W.F.; Scott, M.D.; Wang, J.Y.; Wells, R.S.; et al. (2012). "Lagenodelphis hosei". IUCN Red List of Threatened Species. 2012: e.T11140A17807828. doi:10.2305/IUCN.UK.2012.RLTS.T11140A17807828.en. Database entry includes justification for why this species is listed as data deficient
Whales Dolphins and Porpoises, Mark Carwardine, Dorling Kindersley Handbooks, ISBN0-7513-2781-6
National Audubon Society Guide to Marine Mammals of the World, Reeves, Stewart, Clapham and Powell, ISBN0-375-41141-0
Malaysian Naturalist, Vol 59/3 - 2006, page 5.
External links
Voices in the Sea - Sounds of the Fraser's dolphin 9 July 2014 at the Wayback Machine
February 07, 2023
fraser, dolphin, sarawak, dolphin, lagenodelphis, hosei, cetacean, family, delphinidae, found, deep, waters, pacific, ocean, lesser, extent, indian, atlantic, oceans, size, compared, average, humanconservation, statusleast, concern, iucn, cites, appendix, cite. Fraser s dolphin or the Sarawak dolphin Lagenodelphis hosei is a cetacean in the family Delphinidae found in deep waters in the Pacific Ocean and to a lesser extent in the Indian and Atlantic Oceans Fraser s dolphinSize compared to an average humanConservation statusLeast Concern IUCN 3 1 1 CITES Appendix II CITES 2 Scientific classificationKingdom AnimaliaPhylum ChordataClass MammaliaOrder ArtiodactylaInfraorder CetaceaFamily DelphinidaeSubfamily DelphininaeGenus LagenodelphisFraser 1956Species L hoseiBinomial nameLagenodelphis hoseiFraser 1956 3 Fraser s dolphin range Contents 1 Taxonomy 2 Description 3 Population and distribution 4 Conservation 5 See also 6 Footnotes 7 References 8 Further reading 9 External linksTaxonomy EditLagenodelphis hosei is species of the delphinid family distinguished from other dolphins as a monotypic genus Lagenodelphis 4 In 1895 Charles E Hose found a skull on a beach in Sarawak Borneo He donated it to the British Museum The skull remained unstudied until 1956 when Francis Fraser 3 5 examined it and concluded that it was similar to species in both the genera Lagenorhynchus and Delphinus but not the same as either A new genus was created by simply merging these two names together The specific name is given in Hose s honour It wasn t until 1971 that the whole body of a Fraser s dolphin as it was by then becoming known was discovered At that time washed up specimens were found on Cocos Island in the eastern Pacific in South Australia and in South Africa Description EditFraser s dolphins are about 1 m 3 ft 3 in long and 20 kg 44 lb weight at birth growing to 2 75 m 9 ft 0 in and 200 kg 440 lb by adulthood They have a stocky build a small fin in relation to the size of the body as well as conspicuously small flippers The dorsal fin and beak are also shorter than other species of dolphin The upper side is a gray blue to gray brown A dirty cream colored line runs along the flanks from the beak above the eye to the anus There is a dark stripe under this line The belly and throat are usually white sometimes tinged pink The lack of a prominent beak is a distinguishing characteristic of this dolphin From a distance however it may be confused with the striped dolphin which has a similar coloration and is found in the same regions Fraser s dolphins swim quickly in large tightly packed groups numbering anywhere from 100 to 1 000 in number Often porpoising the groups chop up the water tremendously The sight of seeing a large group fleeing from a fishing vessel has been reported as very dramatic It is also unique in having the smallest genitalia of any open sea dolphin The species feeds on pelagic fish squid and shrimp found some distance below the surface of the water 200 m 660 ft to 500 m 1 600 ft Virtually no sunlight penetrates this depth so feeding is carried out using echolocation alone Population and distribution EditThis section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed March 2021 Learn how and when to remove this template message Dolphin in waters in Papua New Guinea Though only accounted for relatively recently the number of reported sightings has become substantial indicating that the species may not be as rare as thought as recently as the 1980s However the species is still not nearly as well understood as its more coastal cousins No global population estimates exist The dolphin is normally sighted in deep tropical waters between 30 S and 20 N The Eastern Pacific is the most reliable site for viewings Groups of stranded dolphins have been found as far afield as France and Uruguay However these are regarded as anomalous and possibly due to unusual oceanographic conditions such as El Nino The species is also relatively common in the Gulf of Mexico but less so in the rest of the Atlantic Ocean The Philippines is particularly known area for dolphin sightings and is home to one of the larger populations of the Fraser s dolphin in the world Conservation EditThe Southeast Asian populations of Fraser s dolphins are listed on Appendix II 6 of the Convention on the Conservation of Migratory Species of Wild Animals CMS since they have an unfavourable conservation status or would benefit significantly from international co operation organised by tailored agreements 7 In addition Fraser s dolphin is covered by Memorandum of Understanding for the Conservation of Cetaceans and Their Habitats in the Pacific Islands Region Pacific Cetaceans MoU 8 and the Memorandum of Understanding Concerning the Conservation of the Manatee and Small Cetaceans of Western Africa and Macaronesia Western African Aquatic Mammals MoU 9 See also Edit Cetaceans portal Mammals portal Marine life portalList of marine mammal species List of cetaceans Marine biologyFootnotes EditReferences Edit Kiszka J Braulik G 2018 Lagenodelphis hosei IUCN Red List of Threatened Species 2018 e T11140A50360282 doi 10 2305 IUCN UK 2018 2 RLTS T11140A50360282 en Retrieved 19 November 2021 Appendices CITES cites org Retrieved 14 January 2022 a b Lagenodelphis hosei Fraser F C 1956 A new Sarawak dolphin Sarawak Museum Journal 7 8 ns 478 503 478 Hershkovitz P 1966 Catalog of living whales Bulletin of the United States National Museum 246 viii 1 259 60 doi 10 5479 si 03629236 246 Marshall N B 1979 Francis Charles Fraser 16 June 1903 21 October 1978 Biographical Memoirs of Fellows of the Royal Society 25 287 317 doi 10 1098 rsbm 1979 0010 S2CID 71184662 Appendix II Archived 11 June 2011 at the Wayback Machine of the Convention on the Conservation of Migratory Species of Wild Animals CMS As amended by the Conference of the Parties in 1985 1988 1991 1994 1997 1999 2002 2005 and 2008 Effective 5 March 2009 Convention on Migratory Species page on the Fraser s dolphin Archived from the original on 15 October 2012 Retrieved 31 August 2011 Pacific Cetaceans MoU Western African Aquatic Mammals MoUFurther reading EditHammond P S Bearzi G Bjorge A Forney K Karczmarski L Kasuya T Perrin W F Scott M D Wang J Y Wells R S et al 2012 Lagenodelphis hosei IUCN Red List of Threatened Species 2012 e T11140A17807828 doi 10 2305 IUCN UK 2012 RLTS T11140A17807828 en Database entry includes justification for why this species is listed as data deficient Whales Dolphins and Porpoises Mark Carwardine Dorling Kindersley Handbooks ISBN 0 7513 2781 6 National Audubon Society Guide to Marine Mammals of the World Reeves Stewart Clapham and Powell ISBN 0 375 41141 0 Malaysian Naturalist Vol 59 3 2006 page 5 External links EditVoices in the Sea Sounds of the Fraser s dolphin Archived 9 July 2014 at the Wayback Machine Retrieved from https en wikipedia org w index php title Fraser 27s dolphin amp oldid 1117645360, wikipedia, wiki, book, books, library,
