lecture note 14 for BGYB50

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Department
Biological Sciences
Course
BIOC50H3
Professor
Herbert Kronzucker
Semester
Winter

Description
LECTURE 14: - Crucial to the understanding of the ecological and evolutionary roles of environmental change is the concept of optimum curves (or tolerance limit curves): Individuals of species within populations are usually distributed in an optimum curve with respect to environmental factors (e.g. temperature, moisture, light intensity), as they are with respect to other more obvious phenotypic traits (e.g. body size, colour), i.e. the majority of individuals in a population like (are adapted to) similar conditions, with only a few individuals distributed at the margins of the environmental gradient - Natural selection acts upon these distributions, often resulting in a shift in the optimum curve - Selection pressure can be stabilizing, disruptive or directional (see your BGYB51 notes!) - Speciation is often the result of a
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