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The mountain hare is regionally the favourite prey of the golden eagle and may additionally be preyed on by Eurasian eagle-owls and red foxes. Stoats may prey on young hares. [10] In southern parts of Finland, Norway, and Sweden, the mountain hare and the European hare compete for habitat.
These complex interactions between plants, animals and abiotic factors in the tundra are held together by the permafrost layer, located 450 metres (1,480 ft) under the soil. [3] However climate change is causing this crucial layer of frozen soil to melt. As a result, tundra communities are becoming unstable and basic processes are breaking down.
During April and May, the Arctic fox also preys on ringed seal pups when the young animals are confined to a snow den and are relatively helpless. They also consume berries and seaweed, so they may be considered omnivores. [21] This fox is a significant bird-egg predator, consuming eggs of all except the largest tundra bird species. [22]
The diurnal Arctic ground squirrel lives on the tundra and is prey to the Arctic fox, the red fox, the wolverine, Canada lynx, Eurasian lynx, the brown bear, and eagles. It is one of the few Arctic animals, along with their close relatives the marmots [11] and the un-related little brown bat, that hibernate. [12]
The Alaskan hare (Lepus othus), also known as the tundra hare, is a species of mammal in the family Leporidae. [2] They do not dig burrows and are found in the open tundra of western Alaska and the Alaska Peninsula in the United States. They are solitary for most of the year except during mating season, when they produce a single litter of up ...
The flora of the alpine tundra is characterized by plants that grow close to the ground, including perennial grasses, sedges, forbs, cushion plants, mosses, and lichens. [28] The flora is adapted to the harsh conditions of the alpine environment, which include low temperatures, dryness, ultraviolet radiation, and a short growing season.
Multicellular organisms arose independently in brown algae (seaweed and kelp), plants, and animals. [183] Origins of teeth have happened at least two times. [184] Winged flight is found in unrelated species: birds, bats (mammal), insects, pterosaur and Pterodactylus (reptiles). Flying fish do not fly, but are very good at gliding flight. [185]
In some ciliates (peritrichs, chonotrichs and some suctorians), conjugating cells become permanently fused, and one conjugant is absorbed by the other. [21] [25] In most ciliate groups, however, the cells separate after conjugation, and both form new macronuclei from their micronuclei. [26] Conjugation and autogamy are always followed by ...