In E. coli, rRNA synthesis from the seven rRNA operons responds to cellular growth rate and to changes in the availability of crucial nutrients, particularly amino acids. The regulation coordinated with amino acid concentrations is known as the stringent response.

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#Unit 10. Ecological Principles

Characteristics of early and late seral stages

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#Id: 5843

#Unit 10. Ecological Principles

Character                     early-stage     late stage 

Root to shoot ratio                    high               low

Number of seed                          many             few

Seed size                                      small             large

Biotic potential                           high              low

Productivity per biomass           high              low

NPP                                              high              low

P/R ratio                                       >1                =1

Nutrient cycling                          open             closed

Importance of detrivores           less                more

Stratification                               No                Yes 

Regeneration ability                   more             less

Resistance ability                        less               more

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#Id: 5844

#Unit 10. Ecological Principles

Restoration ecology is the full or partial repair or replacement of biological habitats and/or their populations that have been degraded or destroyed.

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#Id: 5845

#Unit 10. Ecological Principles

Complete restoration - Conservationists attempt to return a habitat to its condition prior to the disturbance. 

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#Id: 5846

#Unit 10. Ecological Principles

Rehabilitation - Approach aims to return the habitat to something similar to, but a little less than, full restoration

 

TLS Online TPP Program

#Id: 5847

#Unit 10. Ecological Principles

Ecosystem replacement - replaces the original community with a different one