Switching mechanism of monomeric G proteins 

“On” state, switch I and switch II, are bound to the terminal γ phosphate of GTP with the backbone amide groups of conserved T & G.

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

TLS Online TPP Program

#Id: 5832

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 5833

#Unit 10. Ecological Principles

Step in succession

Nudation 

Migration 

Ecesis 

Aggregation

Competition 

Reaction 

Stabilization

TLS Online TPP Program

#Id: 5834

#Unit 10. Ecological Principles

Primary succession

TLS Online TPP Program

#Id: 5835

#Unit 10. Ecological Principles

Facilitation model =     Species are facilitated by previous colonists

 

Inhibition model =  They are inhibited by the action of previous colonists

Tolerance model   =    They are unaffected by  previous colonists/ New pioneer neither inhibit nor facilitate