Ch20 Biodiversity1.pdf

1 Page
Unlock Document

University College Courses
Spencer Barrett

BIO120H © Lis| Page 111 chapter 20: BIODIVERSITY  why do so many org. live in the tropics? 1. diversity increases w/o limit over time  tropics are older, thus had time to accumulate more species  diversity is a matter of history 2. diversity reaches an equilibrium at which the appearance of new species balances the loss of already existing species  factors that add species weigh more heavily (and those that remove species less heavily) in the balance towards the tropics  but variation also occurs w/in latitudinal belts  suggests that a variety of processes influence the # of species somewhere  processes act uniform globe-wide  patterns in diversity that reflect the variations in temp. and precip. w/in a latitudinal belt imply the influence of local processes  geographic factors VARIATION IN THE RELATIVE ABUNDANCE OF SPECIES INFLUENCES CONCEPTS OF BIODIVERSITY  bbiodiversity variation among organisms and ecological systems at all levels, including genetic variation, morphological and functional variation, taxonomic uniqueness, and endemism, as well as variation in ecosystem structure and function  ecologists study most simple and general indices of biodiversity: species richness  measurement of the gravitas (“presence”) of a species depends on the purpose and method of study  rrelative abundance the proportional rep
More Less

Related notes for UNI101Y1

Log In


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.