Rods 

Have low acuity or resolution

are sensitive to low-intensity light

receptors for night vision (scotopic vision)

TLS Online TPP Program

#Id: 5881

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 3720

#Unit 10. Ecological Principles

Clement’s organismic model - Competition causes sharp boundaries between groups of species; certain species group together.

TLS Online TPP Program

#Id: 3721

#Unit 10. Ecological Principles

Gleason’s individualistic model - Competition does not cause sharp boundaries; different species do not group together due to physical variables.

TLS Online TPP Program

#Id: 3722

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 3723

#Unit 10. Ecological Principles

Species richness - which is a count of the number of species.

TLS Online TPP Program

#Id: 3724

#Unit 10. Ecological Principles

One major problem is that this approach does not take species frequency of occurrence or relative abundance into account.