Postulate of Darwin

Geometric increase 

Limited food & Space

Struggle for existence 

Variation 

 Natural selection

Inheritance of useful characters

Speciation

TLS Online TPP Program

#Id: 2202

#Unit 10. Ecological Principles

Ecosystem replacement - replaces the original community with a different one

TLS Online TPP Program

#Id: 2203

#Unit 10. Ecological Principles

Many restored habitats have greater biodiversity and ecosystem services than degraded habitats.

TLS Online TPP Program

#Id: 2204

#Unit 10. Ecological Principles

Species richness of both plants and animals, often, but not always, increases as succession proceeds.

TLS Online TPP Program

#Id: 5829

#Unit 10. Ecological Principles

Ecological succession

TLS Online TPP Program

#Id: 5830

#Unit 10. Ecological Principles

Succession, the gradual and continuous change in species composition and community structure over time.

TLS Online TPP Program

#Id: 5831

#Unit 10. Ecological Principles

Causes Succession

Allogenic factors –  Chemical weathering of rocks or filling in by sand/silt in a pond

Autogenic factors – Autogenic factors include – Immigration, Growth, Reaction, Coactions