Conservation
Why do we need to conserve what we have?
Define an Individual
A single organism
Define Population Size
Population size is the total amount of organisms in a population.
We count them!
Define Population Density
Population density is the amount of organisms in an area.
We look at them, but don't count them!
Define Population Distribution
Population distribution is the way that organisms are arranged within a population
What is a biosphere? Give an example
A biosphere is a 'life sphere' it contains all of the life on Earth.
Example: Earth
Quick! What is the population size of the classroom???
Ms. Hines will tell you :)
Take a look around the classroom, do we have a high population density today or a low population density?
A high population density!
What are some reasons why an organism would migrate?
For more food, water, or space
What is the main difference between a population and a community?
A population is the same species
A community is made up of different species?
How do limiting factors limit the size of populations?
By stopping the population from being able to grow
Looking at a tiger and a mouse, which would have a higher population density? Why?
A mouse, their small size allows more of them to be in an area.
You could fill the room with more rats than tigers.
Give an example of random distribution. Why is it random?
Dandelions are random because their seeds are blown by the wind. Wherever they land, they grow.
Which organism has the biggest impact on the environment?
Humans
Describe an ecosystem
An ecosystem contains all of the biotic and abiotic factors in an environment.
There should be plants, animals, rocks, and water
What type of growth do we see when a population reaches its carrying capacity?
Logistic Growth
List three density dependent factors
Food/water supply, Predation, Disease
What are some reasons that a population would be showing uniform distribution?
1) In trees, it's to compete for sunlight
2) In penguins, it's because they're territorial
What are some of the largest threats to biodiversity?
Habitat destruction, overhunting/overfishing, human disturbances
List the Levels of Organization from smallest to largest.
Individual -> Population -> Community -> Ecosystem -> Biosphere
What would influence the size of a population?
Death, birth, organisms moving into an area, organisms moving out of an area
List three density independent factors
What are some reasons that a population would be showing clumped distribution?
1) They are clumped around resources.
2) They are clumped for protection.
3) In plants, sometimes they just drop their seeds straight down.