What is eclogical succession? How Hydrarch succession is different from Xerarch succession.

Explanation

The gradual and fairly predictable changes in species composition of a given area is called ecological succession.
(i) Hydrarch succession takes place in wetter area, whereas xerarch succession takes place in dry areas,
(ii) In hydrarch succession, the successional series progress from hydric to mesic condition, whereas in xerarch it progress from xeric to mesic.
(iii) In hydrarch succession, pioneer species are small phytoplanktons, whereas in xerarch succession pioneer species are lichens.
Detailed Answer:
Ecological Succession
It is a gradual, slow and predictable change in the species composition of an area leading to a climax community (community that is in equilibrium with the environment). ,br> During succession some species colonize an area and become more numerous, whereas populations of other species de cline and disappear.
The entire sequences of communities that successively change in a given area are called sere.