FISH 423 Lecture Notes - Lecture 8: Propagule
21 Jan 2021
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Document Summary
Pictures from lecture slides on class canvas website. A composite measure of the number of individuals released into a region to which they are not native. May be the most important factor in establishment success of nonnative species of various taxa in a variety of ecosystems worldwide. Incorporates both the absolute number of individuals involved in any one introduction event (propagule size), and the number of discrete release events (propagule number) Studies show the higher the propagule intensity, the greater the probability of successful establishment. Describes the relationship between the probability of the undesirable effect (establishment) and the magnitude of the stressor (propagule establishment) Variability in the shape of the curve is of considerable practical interest. A central tenant of population biology is that the more individuals there are in a population, the less likely the population is to become extinct.
