explain the different steps of xerarc succession occurring in nature

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Gradual and fairly predictable change in the species composition of a given area is called ecological succession.

Ecological succession on land  (xerarch succession)
The succession initiated on bare rock or wind blown sand where water is low is termed as xerarch succession.
  • Steps:
  1. The first plants to colonise here are crustose lichens like Rhizocarpon, Rhinodina and Lecidea.
  2. Foliose lichens (Dermatocarpon and Parmelia) replaces the crustose lichens.
  3. Foliose lichens in turn are replaced by mosses like Polytrichum, Tortula etc.
  4. After mosses herbs occupy the land which are replaced by shrubs like Rhus and Phytocarpus.
  5. Finally the climax species i.e. forests becomes dominant on the land and form climax community.
 
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