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3 ημέρες πριν · Tundra areas have a continuous cover of vegetation, and many different tundra associations (plant communities) may be recognized. In the drier and better-drained parts, heath tundra, made up of a carpet of lichens and mosses with isolated flowering plants, is dominant.
5 ημέρες πριν · polar bear, (Ursus maritimus), great white northern bear (family Ursidae) found throughout the Arctic region. The polar bear travels long distances over vast desolate expanses, generally on drifting oceanic ice floes, searching for seals, its primary prey.
4 ημέρες πριν · The eyes of a polar bear are close to the top of the head, which may allow them to stay out of the water when the animal is swimming at the surface. They are relatively small, which may be an adaption against blowing snow and snow blindness. Polar bears are dichromats, and lack the cone cells for seeing medium, mainly green, wavelengths.
4 ημέρες πριν · Snowy owls are native to the Arctic regions of both North America and the Palearctic, breeding mostly on the tundra. It has a number of unique adaptations to its habitat and lifestyle, which are quite distinct from other extant owls. [7]
4 ημέρες πριν · The ringed seal (Pusa hispida) is an earless seal inhabiting the Arctic and sub-Arctic regions. The ringed seal is a relatively small seal, rarely greater than 1.5 m in length, with a distinctive patterning of dark spots surrounded by light gray rings, hence its common name.
5 ημέρες πριν · The open terrain of the tundra permits the supervision of large herds, and these generally migrate with their herdsmen between winter pastures within the margins of the taiga and summer pastures out on the tundra.
5 ημέρες πριν · Strongly cyclic interaction between plants, herbivores and predators typically drives the food web dynamics over large tracts of the arctic tundra biome. These interaction cycles, however, now appear to be fading out at the southern edge of tundra, possibly due to climate warming.
