fbpx

Tundra Biome

 There are two types of tundra – arctic and alpine.

Distribution

  • Arctic tundra extends as a continuous belt below the polar ice cap and above the tree line (taiga) in the northern hemisphere.
  • It occupies the northern fringe of Canada, Alaska, European Russia, Siberia and island group of Arctic Ocean.
  • On the South Pole, tundra is very small since most of it is covered by ocean.
  • Alpine tundra occurs at high mountains above the tree line. E.g. High ranges of Himalayas, Andes, Alps etc.

Temperature

  • The tundra climate is characterized by a very low mean annual temperature.
  • In mid-winter temperatures are as low as 40 – 50 °C below freezing.

Precipitation

  • Precipitation is mainly in the form of snow and sleet.

Natural Vegetation

  • There are no trees in the tundra (Ground is frozen). Lowest form of vegetation like mosses, lichens etc. are found here and there.
  • Coastal lowlands support hardy grasses and the reindeer moss which provide the only pasturage for reindeers.
  • In the brief summer, berry-bearing bushes and Arctic flowers bloom.
  • In the summer, birds migrate north to prey on the numerous insects which emerge when the snow thaws.
  • Insects have short life cycles which are completed during favourable period of the year.
  • Animals like the reindeer, arctic fox, wolves, musk-ox, polar bear, lemming, arctic hare, arctic willow etc. live in tundra region.
  • Reptiles and amphibians are almost absent.
  • Most of the animals have long life e.g. arctic willow has a life span of 150 to 300 years.
  • They are protected from chillness by the presence of thick cuticle and epidermal hair or fur.
  • Mammals of the tundra region have large body size and small tail and ear to avoid the loss of heat from the surface [less surface area = less heat loss = less food required to produce heat].

Complete your Full Environment Preparation with Us with quality knowledge as education is everyone’s right. Also complete full NCERT and UPSC-IAS Preparation . Must SHARE and SUPPORT us.

466 total views, 3 views today

Leave a Reply

Your email address will not be published. Required fields are marked *

error: Content is protected !!
%d bloggers like this: