Class Notes (839,471)
Canada (511,354)
Biology (2,229)
BIO120H1 (1,171)
Jon Abbatt (10)
Lecture 2

Lecture 2 and 3 notes of Prof. Thomson

2 Pages

Course Code
Jon Abbatt

This preview shows 80% of the first page. Sign up to view the full 2 pages of the document.
Lecture 2 & 3:Physical challenges of the environment Geographic Ranges Animals Geographic ranges usually correspond to biomes (limit to climates or vegetation), but sometimes it is also affected by other factors:  Special habitats ○ Pronghorns have a broad temperature tolerance range but a narrow habitat range  Other organisms ( enemies, friends) ○ Elf owls, gila woodpekers depends on cactus.  Transcendent biomes ○ Tigers can live in any habitat either hot or cold.  History Thermal Ecology: Ways to gain or loss heat:  Radiation: emission of electromagnetic energy by a warm surface.  Conduction: transfer of the kinetic energy of heat between substances in contact with one another.  Convection: transfer of heat by the movement of liquids and gases  Evaporation: efficient cooling from wet surface.  Redistribution: circulatory system redistributes heat among body parts. Body size and thermal inertia:  Larger organisms tend to lose heat across their surfaces less rapidly than smaller individuals this is because the surface-to-volume ratio is smaller(V 比 SA 大). It is easier for them to maintain a constant internal environment in the face of varying external conditions. ○ Bergmann’s Rule: Homeotherms tend to be larger at a higher altitude.  Polar bear lives in the Artic are bigger than Sun bear that live in the tropics. ○ Allen’s Rule: appendages reduced in cold temperature.  Pika has spheri
More Less
Unlock Document

Only 80% of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

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.