ecology junk

E = eP

Rate at which subpopulations will go

extinct

C = [mP(1 – P)]

Rate of colonization of empty patches

 P/ t = C – E

Change in metapopulations

P

Fraction of patches occupied

1-P

fraction of patches unoccupied

m

probability of colonization

e

probability of each subpopulation going extinct

N

total number of individual organisms of a species

K

Carrying Capacity

r

growth rate

dN/dt=rN

Exponential Growth

dN/dt=rN K-N/K

logistic growth

d

The per capita mortality rate of the predator in the absence of food.

b

The efficiency with which predators convert consumed prey into new predator offspring.

c

The ability of the predator to catch prey (often denoted as 'a' in other models, this represents the capture rate).

S

species richness

Relative abundance:

the percentage each species contributes to the total number of individuals of all species

Diversity indices

provide a way to quantify the relationship between species number and relative abundance

D

Simpson’s index

1-D

Simpson’s index of diversity

1/D

Simpson’s reciprocal index or Simpson’s diversity index

H

Shannon (or Shannon-Weiner) index