Measuring Propagule Pressure
The total probability of establishment (E) can be determined using this equation. It considers the fact that each propagule has an independent chance of establishment:
(E) is the total probability of establishment (p) is the probability of a one propagule establishing (N) is the # of propagules arriving at specific location at a certain time (l) is the location (t) is the time
- It is to be noted that the equation can also be written as the standard asymptotic curve (sometimes termed the independence model):
Alpha=shape coefficient which is equivalent to –ln(l – p).
Measures of propagule pressure are have been shown to have specific relationships with the probability of establishment.(Leung et al. 2004)
Read more about this topic: Propagule Pressure
Famous quotes containing the words measuring and/or pressure:
“... there is no way of measuring the damage to a society when a whole texture of humanity is kept from realizing its own power, when the woman architect who might have reinvented our cities sits barely literate in a semilegal sweatshop on the Texas- Mexican border, when women who should be founding colleges must work their entire lives as domestics ...”
—Adrienne Rich (b. 1929)
“The mother whose self-image is dependent on her children places on those children the responsibility for her own identity, and her involvement in the details of their lives can put great pressure on the children. A child suffers when everything he or she does is extremely important to a parent; this kind of over-involvement can turn even a small problem into a crisis.”
—Grace Baruch (20th century)