Baikal Seal |AQ Fun
Baikal Seal
The Baikal seal, Lake Baikal seal or nerpa (Pusa sibirica), is a species of earless seal endemic to Lake Baikal in Siberia, Russia. Like the Caspian seal,
The Baikal seal is one of the most miniature true seals. Adults typically grow to 1.1–1.4 m (3 ft 7 in – 4 ft 7 in) in length with a body mass from 63 to 70 kg (139 to 154 lb). The maximum reported size is 1.65 m (5 ft 5 in) in length and 130 kg (290 lb) in weight. There are significant annual variations in the weight, with the lowest weight in the spring and the highest weight, about 38–42% more, in the fall. The animals show minimal sexual dimorphism; males are only slightly larger than females. They have a uniform, steely-grey coat on their backs and fur with a yellowish tinge on their abdomens. As the coat weathers, it becomes brownish. When born, the pups weigh 3–3.5 kg (6.6–7.7 lb) and are about 70 cm (2 ft 4 in) long.[1] They have coats of white, silky, natal fur. This fur is quickly shed and exchanged for darker skin, much like that of adults. Rarely, Baikal seals can be found with spotted coats
The Baikal seal lives only in the waters of Lake Baikal.[6] It is something of a mystery how Baikal seals came to live there in the first place. The skull structure of the Baikal seal suggests it is closely related to the Caspian seal. In addition, the morphological structures in both species suggest they are descended from Arctic ringed seals.[7] They may have swum up rivers and streams or possibly Lake Baikal was linked to the ocean at some point through a large body of water, such as the Tethys Ocean, West Siberian Glacial Lake, or West Siberian Plain, formed in a previous ice age. The seals are estimated to have inhabited Lake Baikal for some two million years.[8]
The areas of the lake in which the Baikal seals reside change depending on the season, as well as other environmental factors. They are solitary animals for the majority of the year, sometimes living kilometers away from other Baikal seals. In general, a higher concentration of Baikal seals is found in the northern parts of the lake, because the longer winter keeps the ice frozen longer, which is preferable for pupping.[5] However, in recent years, migrations to the southern half of the lake have occurred, possibly to evade hunters.[3] In winter, when the lake is frozen over, seals maintain a few breathing holes over a given area and tend to remain nearby, not interfering with the food supplies of nearby seals. When the ice begins to melt, Baikal seals tend to keep to the shoreline.
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