Class Notes (810,830)
Canada (494,279)
BIOA01H3 (687)

BIOA02 Module 3 Lecture 2

5 Pages
Unlock Document

University of Toronto Scarborough
Biological Sciences
Monica Sauer

Lecture 2 Ecology: Ecology is the study of: • the distribution and abundance of organisms • the interactions among organisms (= biotic interactions) • the interactions between organisms and their non-living environments (= abiotic interactions) Population: Population:All individuals of a single species that live together in the same place and time. Populations are characterized by their: • Size, the number of individuals in the population. • Distribution, or the limits of their geographic range. • Density, the number of individuals per unit area (e.g. 5 mice / 10 m2) • Dispersion, the distribution of individuals within their range. • Age Structure, the relative numbers of individuals in different age groups. • Generation Time, the avg. time between an organism’s own birth and the birth of • its offspring (reproduction). • Sex Ratio, the relative number of males vs. females • Proportion reproducing, proportion of individuals in a population actually producing offspring. Distribution: Distribution is used interchangeably with range. The size of a species range may relate to its rarity. • Avery large range may suggest that a species is common and adaptable. Lecture 2 • Avery small range suggests that a species is locally endemic or specialized to particular habitats. • Density: The number of individuals per unit area. Where larger animals have lower population density. Dispersion: The distribution of individuals within their range Sex Ratio & Proportion Reproducing: Sex Ratio is the relative proportions of males vs. females in the population. The number of females usually has a larger impact on population growth than the number of males. Only females actually produce offspring! The Proportion Reproducing is the actual proportion of males or females contributing to population growth. Age Structure & Generation Time Age Structure: the relative numbers of individuals in age groups Generation Time: the average time between an organism’s own birth and the birth of its offspring (its first reproductive event). Age Structure and Generation Tim
More Less

Related notes for BIOA01H3

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.