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Peale's dolphin

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Title: Peale's dolphin  
Author: World Heritage Encyclopedia
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Subject: Lagenorhynchus, Oceanic dolphin, Cetacea, Bertha's Beach Important Bird Area, Cephalorhynchus
Collection: Mammals of Argentina, Mammals of Chile, Megafauna of South America, Oceanic Dolphins
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Peale's dolphin

Peale's dolphin
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Subclass: Eutheria
Order: Cetacea
Suborder: Odontoceti
Family: Delphinidae
Genus: Lagenorhynchus
Species: L. australis
Binomial name
Lagenorhynchus australis
(Peale, 1848)
Peale's dolphin range

Peale's dolphin (Lagenorhynchus australis) is a small dolphin found in the waters around Tierra del Fuego at the foot of South America. It is also commonly known as the black-chinned dolphin or even Peale's black-chinned dolphin. However, since Rice's work [2] Peale's dolphin has been adopted as the standard common name.

Contents

  • Taxonomy 1
  • Physical description 2
  • Population and distribution 3
  • Behaviour 4
  • Conservation 5
  • See also 6
  • References 7

Taxonomy

Though it is traditionally placed in the genus Lagenorhynchus, recent molecular analyses indicate Peale's dolphin is actually more closely related to the dolphins of the genus Cephalorhynchus. If true, this would mean this species must either be transferred to Cephalorhynchus or be given a new genus of its own. An alternate genus proposed for this species (as well as the Pacific white-sided dolphin and dusky dolphin is Sagmatias.[3] Some behavioral and morphological data support moving Peal's dolphin to Cephalorhynchus. According to Schevill & Watkins 1971, Peale's dolphin and the Cephalorhynchus species are the only dolphins that do not whistle. Peale's dolphin also shares with several Cephalorhynchus species the possession of a distinct white "armpit" marking behind the pectoral fin.

Physical description

Peale's dolphin

Peale's dolphin is of typical size in its family — about 1 m in length at birth and 2.1 m (6.9 ft) when fully mature. Its adult weight is about 115 kg. It has a dark-grey face and chin. The back is largely black with a single off-white stripe running curving and thickened as it runs down the back on each side. The belly is white. Conspicuously, also a white patch occurs under just behind each flippers. These are known as the "armpits". The flanks also have a large white-grey patch above the flipper. The dorsal fin is large for this size cetacean and distinctively falcated. The flippers themselves are small and pointed. The tail fin, too, has pointed tips, as well as a notch at its middle.

The species looks similar to the dusky dolphin when viewed at a distance, and may be confused with it.

Population and distribution

Peale's dolphin is endemic to the coastal waters around southern Argentina. In the south, they have been seen at almost 60°S — well into the Drake Passage.

They are often found in areas of fast-moving waters, such as entrances to channels and narrows, as well as close to shore in safe areas such as bays.

The total population is unknown, but is thought to be locally common.

Behaviour

Peale's dolphins congregate in small groups — usually about five in number, and sometimes up to 20. On rare occasions in summer and autumn, much larger groups have been recorded (100 individuals). A typical pattern is for the group to move in a line parallel to the shore. They usually swim slowly, but are prone to bursts of activity.

Conservation

Peale's dolphins' propensity for moving over only small areas, and staying close to shore, has rendered them vulnerable to interference by man. During the 1970s and '80s, Chilean fisherman killed and used thousands of Peale's dolphins for crab bait each year. This practice has decreased, but not been made illegal.

In Argentina, Peale's dolphins have been reported becoming trapped in gill nets, but the extent of this is not known. Conservation groups such as the Whale and Dolphin Conservation Society demand further research be made into this species.

The Peale's dolphin or black-chinned dolphin is listed on Appendix II[4] of the Convention on the Conservation of Migratory Species of Wild Animals (

  • National Audubon Society: Guide to Marine Mammals of the World ISBN 0-375-41141-0
  • Encyclopedia of Marine Mammals ISBN 0-12-551340-2
  • LeDuc, R.G.; Perrin, W.F.; Dizon, A.E. (July 1999). "Phylogenetic relationships among the delphinid cetaceans based on full cytochrome b sequences". Marine Mammal Science 15: 619–648.  
  • May-Collado, Laura; Agnarsson, Ingi (2006). and Bayesian inference of whale phylogeny"b"Cytochrome (PDF). Molecular Phylogenetics and Evolution 38: 344–54.  
  • Schevill, W.E.; Watkins, W.A. (15 January 1971). "Pulsed sounds of the porpoise Lagenorhynchus australis". Breviora 366: 1–10.  
  1. ^ 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. & Wilson, B. (2008). Lagenorhynchus australis. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 24 March 2009. Database entry includes a brief justification of why this species is of data deficient.
  2. ^ "Marine Mammals of the World. Systematics and Distribution", by Dale W. Rice (1998). Published by the Society of Marine Mammalogy as Special Publication No. 4
  3. ^ Shirihai, H. and Jarrett, B. (2006). Whales, Dolphins and Other Marine Mammals of the World. Princeton Field Guides. pp. 205–207.  
  4. ^ a b "Appendix II" 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.
  5. ^ Convention on Migratory Species page on the Peale's dolphin / Black-chinned dolphin

References

See also

[5]

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