| | Introduction to Natural and Sexual Selection |
 | | However, for traits like survival which take on fitness values that are either 0 (dead) or 1 (alive), The linear regression describes how the probability of survival varies as a function of the trait of interest. |
 | | As we shall see in the chapter on mating systems and parental care, offspring number is a central trait which influences not only fitness of the parent (e.g., more offspring means more fitness), but also the amount of parental effort in the form of behavior and energy that could influence the survival of parents. |
 | | Nevertheless, analysis of the correlations between behavioral traits that are expressed in a population (e.g., presence or absence of slugs) and the selective environment (e.g., presence or absence of prey) is a classic indirect testing for adaptation and inferring the historical action of natural selection. |
| bio.research.ucsc.edu /~barrylab/classes/animal_behavior/SELECT.HTM (11775 words) |