Propagule Pressure - Measuring Propagule Pressure

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:

    We recognize caste in dogs because we rank ourselves by the familiar dog system, a ladderlike social arrangement wherein one individual outranks all others, the next outranks all but the first, and so on down the hierarchy. But the cat system is more like a wheel, with a high-ranking cat at the hub and the others arranged around the rim, all reluctantly acknowledging the superiority of the despot but not necessarily measuring themselves against one another.
    —Elizabeth Marshall Thomas. “Strong and Sensitive Cats,” Atlantic Monthly (July 1994)

    Destiny is an absolutely definite and inexorable ruler. Physical ability and moral determination count for nothing. It is impossible to perform the simplest act when the gods say “no.” I have no idea how they bring pressure to bear on such occasions; I only know that it is irresistible.
    Aleister Crowley (1875–1947)