The light-absorbing/ emitting center of GFP (its chromophore) comprises an oxidized form of the tripeptide –Ser65–Tyr66–Gly67

TLS Online TPP Program

#Id: 5348

#Unit 10. Ecological Principles

Many populations breed seasonally, often once a year some are quarterly or monthly.

These are iteroparity or semelparity.

TLS Online TPP Program

#Id: 5349

#Unit 10. Ecological Principles

R0<1, The population eventually declines to extinction 

R0=1, The population size remains constant

R0>1, The population increases

TLS Online TPP Program

#Id: 5350

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 5351

#Unit 10. Ecological Principles

λ represents the finite rate of population change over some time interval, often a year

λ = N1/N0

TLS Online TPP Program

#Id: 5353

#Unit 10. Ecological Principles

Populations grow when R0 or λ>1, populations decline when R0 or λ<1, and are at equilibrium when R0 or λ=1

TLS Online TPP Program

#Id: 5368

#Unit 10. Ecological Principles

The simplest method to measure population density is to visually count the number of organisms in a population in a given habitat.