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White-beaked Dolphin

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The White-beaked Dolphin (Lagenorhynchus albirotstris), is strikingly large and robust for a dolphin. It swims very fast and is quite acrobatic. with a maximum length of 10 feet, it travels further north than any other dolphin. It's range includes the UK.

Physical DescriptionEdit

The white-beaked dolphin is a sturdy, robust-bodied animal that can reach 3.1 metres in length and weigh up to 350 kg when fully grown. The dark grey dorsal fin is tall and falcate (curved) and the beak is short and often entirely white. Colouration is a mix of dark grey back, tail and pectoral fins, with greyish-white flashes along the flanks and a pale grey patch behind the dorsal fin (known as the saddle-patch). The tail stock is quite thick.

Habitat and DistributionEdit

The white-beaked dolphin is only found in the temperate and sub-arctic waters of the North Atlantic. In the Hebrides, they are usually seen in open waters further from the coast, and seem to favour the northern Hebrides. Some research suggests that white-beaked dolphin numbers have declined in recent years, whilst common dolphin abundance has increased, which could mean the species are competing for habitat or food.

BehaviourEdit

White-beaked dolphins are fast, powerful swimmers that are attracted to boats in order to bow ride; this involves swimming in the pressure wave in front of a boat, which reduces energy expenditure and is also probably a fun activity. They are quite acrobatic and frequently ‘porpoise’ (jump clear of the water) when travelling at speed. These dolphins are usually seen in small groups of five to 50 animals but occasionally form larger groups of several hundred individuals.

Food and ForagingEdit

White-beaked dolphins have a varied diet of fish, ranging from small schooling fish such as sandeels and herring to larger bottom-dwelling fish including cod, whiting and haddock. They are also known to eat molluscs, squid, octopus and some crustaceans. These dolphins will work together when feeding using whistles, tail slaps and leaps to coordinate their hunt, and they may also associate with feeding minke whales and humpback whales.

Status and ConservationEdit

One of the major threats to white-beaked dolphins is incidental capture and drowning in gillnet, driftnet and trawl fisheries. Rising sea temperatures caused by climate change may affect the future distribution of white-beaked dolphins in our waters because the UK shores represent the southern limit of their distribution. In addition to these threats, like other cetacean species, the white-beaked dolphin is affected by marine pollution, habitat degradation and disturbance caused by boating activities. The effect of an accumulation of organochlorines (pesticides) in cetaceans’ bodies is not yet understood. White-beaked dolphins are protected under UK and EU law, principally under Schedule 5 of the Wildlife and Countryside Act 1981, the Nature Conservation (Scotland) Act 2004 and by the 1992 EU Habitats and Species Directive.

ReferencesEdit

Content From: http://www.whaledolphintrust.co.uk/ - Specifically: http://www.whaledolphintrust.co.uk/species_details.asp?inst=18&species_id=118

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