The possibility of damage from self-reactive lymphocytes is further limited by the life span of activated lymphocytes, which is regulated by programs that induce cell death (apoptosis).

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

TLS Online TPP Program

#Id: 5836

#Unit 10. Ecological Principles

Secondary succession

TLS Online TPP Program

#Id: 5837

#Unit 10. Ecological Principles

Sequential changes in community structure over physical distance, primarily influenced by time, constitute a chronosequence

TLS Online TPP Program

#Id: 5838

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 5839

#Unit 10. Ecological Principles

Facilitation may be important in early seral stages and inhibition important in later ones or vice versa.