Textbook Notes (378,353)
CA (167,126)
UTSC (19,207)
BIOA02H3 (153)
Chapter 54

Chapter 54 Population Ecology

10 Pages
170 Views

Department
Biological Sciences
Course Code
BIOA02H3
Professor
Kamini Persaud

This preview shows pages 1-3. Sign up to view the full 10 pages of the document.
Sanchika Kanagalingam
April 11th 2011
Biology II
Chapter 54: Population Ecology
Basic Definitions
Population: all the individuals of a species in an area
Population structure: number of individuals at different ages and where do those age
groups live
Population Density: individual per unit area
oHow close together individuals live
oInfluence interactions with one another
Demographic event: this that change the population
oBirth death
oIndividuals coming into population and leaving
oAll put together make population dynamic
Study of population dynamics is called demography
How do Ecologists Study Populations?
To study population you will have to be able to keep track of animals over time to know
what is happening to the population
Use tracking devices such as tags and markers to facilitate research
Tracking devices may provide addition physiological and environmental data
ohave become more sophisticated now can use computer chips embedded in them
heartbeat, pulse and temperature can be obtained
Molecular markers
oTrack where individuals have been
www.notesolution.com
Sanchika Kanagalingam
April 11th 2011
Biology II
oEg. Redstarts
Where they are going when they migrate?
When they come back in the spring what isotope of hydrogen do they have
Precipitation at different latitude has different isotope of hydrogen
Natural tracking device when it comes to precipitation
Measuring Population Density
Counting every individual in a population is of not possible
Statistical methods to estimate population size from samples
Capture, Mark, Recapture method
o4 steps to this method
Capture a sample of individuals
Mark all of them
Release them into general population
Capture another small sample
Proportion of marked individuals in the new sample is used to estimate population size
o
Eg. How many individuals are in this room
oOne way is tagging 10 people have released them and then next day take another
10 individuals and see of the 2/10 have tags so 1/5 so 10 out of 50 have a tag so
50 individuals in total
www.notesolution.com
Sanchika Kanagalingam
April 11th 2011
Biology II
Population densities can be used to estimate Rates of demographic events
o
oTo find the new population after 1(N1) year you take the population you had 1
year ago(No) add the number of birth(B), subtract the number of death(D), add
the number of individuals immigrated(I) and subtract the number of emigrated(E).
If these counts are made over many time intervals we can determine how population
density changes over time
A Life table is constructed by tracking a groupof individuals born at the same time, a
cohort
oFigure what is happening to a population
oOne set of individual and follow them through time
See the changes
See what effects them
Eg. Take individuals in the same age group (0) called a cohort you re measuring
oNext year you count all the 1 year olds and see less
oYou then make a survival rate
Which determines if you can go to the next year
Survivorship-numbers that are still alive at later dates
Life tables can be used to predict future trends
Survivorship curves
oThe data can be plotted to show survivorship in relation to age
oSurvivorship curves fall into 3 different general patterns
oHigh survivorship (whole life until death)
Once your born nothing effects your survivorship and die of old age
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Sanchika Kanagalingam April 11 2011 Biology II Chapter 54: Population Ecology Basic Definitions Population: all the individuals of a species in an area Population structure: number of individuals at different ages and where do those age groups live Population Density: individual per unit area o How close together individuals live o Influence interactions with one another Demographic event: this that change the population o Birth death o Individuals coming into population and leaving o All put together make population dynamic Study of population dynamics is called demography How do Ecologists Study Populations? To study population you will have to be able to keep track of animals over time to know what is happening to the population Use tracking devices such as tags and markers to facilitate research Tracking devices may provide addition physiological and environmental data o have become more sophisticated now can use computer chips embedded in them heartbeat, pulse and temperature can be obtained Molecular markers o Track where individuals have been www.notesolution.com
More Less
Unlock Document


Only pages 1-3 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


OR

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


OR

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.


Submit