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Gervais' Beaked Whale
Size comparison against an average human
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Cetacea
Suborder: Odontoceti
Family: Ziphidae
Genus: Mesoplodon
Species: M. europaeus
Binomial name
Mesoplodon europaeus
(Gervais, 1855)
Gervais' Beaked Whale range

Gervais' Beaked Whale (Mesoplodon europaeus), sometimes known as the Antillian Beaked Whale, Gulf Stream Beaked Whale, or European Beaked Whale (from which its scientific name is derived) is the most frequently stranding type of Mesoplodont whale off the coast of North America. It has also stranded off South America and Africa.

Contents

Physical description

This species is rather gracile, elongated, and laterally compressed compared with other mesoplodonts. The mouthline is remarkably straight, even in males, and the two teeth of the male erupt towards the tip of the beak, and are hardly noticeable. The head is overall small and tapering in outline. The melon only bulges very slightly. The coloration is dark gray on top and lighter gray on bottom. Females sometimes have lighter spots near the genitals and face, with a dark circle remaining around the eyes. Juveniles start off with a lighter coloration, but soon darken. Males are 4.5 meters (15') in length and females are at least 5.2 meters (17') and probably weigh more than 1200 kg (2600 pounds). Calves are believed to be 2.1 meters (7 feet) in length. One beached specimen may have been 48 years old.

Population and distribution

The first stranding occurred in England, but it has since been found off Ireland, the Canary Islands, Western Africa, and Ascention Island. In August 2001, a specimen was found off São Paulo, Brazil; the southernmost speciman found to date. The species is believed to be naturally rare, and no estimates have been attempted.

It is remarkable that although this species frequently strands (the first occuring in 1840), until 1998 no human had seen a living specimen. Since then only ten other sightings have occurred.

Behavior

Judging by beachings, the whales inhabit small groups. They probably feed on squid.

They can dive deep : the first sighting in 1998 (west of the island of Tenerife) involved three whales at a depth of 1500 meters.

Another small group was seen south of the island of Gran Canaria : Although timid, the whales allowed close photos. It was reported that they surfaced for short time, and that their dives lasted for around an hour. [1]

In September 2008, northeast of the island of Lanzarote, some Gervais' beaked whales were photographed breaching out of the water.[2]

Conservation

The species has not been hunted and only very infrequently gets tangled up in fishing nets.

References

  • Taylor, B.L., Baird, R., Barlow, J., Dawson, S.M., Ford, J., Mead, J.G., Notarbartolo di Sciara, G., Wade, P. & Pitman, R.L. (2008). Mesoplodon europaeus. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 24 March 2009. Database entry includes a brief justification of why this species is of data deficient.
  • Encyclopedia of Marine Mammals. Edited by William F. Perrin, Bernd Wursig, and J.G.M Thewissen. Academic Press, 2002. ISBN 0-12-551340-2
  • Sea Mammals of the World. Written by Randall R. Reeves, Brent S. Steward, Phillip J. Clapham, and James A. Owell. A & C Black, London, 2002. ISBN 0-7136-6334-0
  • A Gervais' beaked whale (Mesoplodon europaeus) washed ashore in southeastern Brazil: extra limital record? Santos, Zampirolli, Castro, and Alarenga. Aquatic Mammals 2003. 29.3, 404-410. Available: here
  • Red Canaria de Varamientos (Vonk & Martín 1988; Martín & Carrillo, 1992; Martín et al. 1995;Carrillo & Martín, 2000; Carrillo & Tejedor, 2002, 2003, 2004)
  • Estudios aplicados a la conservación de las poblaciones de cetáceos en la provincia de Santa Cruz de Tenerife. Informe para el Gobierno de Canarias by Carrillo, M. and Tejedor M. 2002 (Tenerife Conservación - Biblioteca pública del Centro de Planificación Ambiental de la Laguna – Tenerife)

External links

sp:Zifio de Gervais

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