Pop bio test #4 Dispersion

Define dispersion

how indiv. in a pop. are arranged in space

Define dispersal

the movement of offspring away from parent organisms

define distribution

where organisms occur geographically

sessile organisms vs motile organisms vs mobile organisms

sessile: dont move

motile: move on own

mobile: moved by force

what are the dispersion patterns and how common are they?

Clumped: most common

regular: least common

random: in between

what is a rested quadrat

series of quadrats inside one another

(increasing or decreasing size)

What are transects

Lines established across a study area

Variance/mean ratio=index of dispersion= (s^2/x)

describes relationship between "average" # of indivduals per quandrat and how much the quadrats varied in number of indiv.

Clumped: s^2/x >1

Regular: s^2/x = 1

Random: s^2/ x < 1