Chapter 35 - Populations

Populations

Can change over timeMust determine the limits of an area

Population Density -

Ex - _________________________, or _____________________________________________

Can change over timeMust determine the limits of an area

Population Density -

Ex - _________________________, or _____________________________________________

Question

What would rather receive?$1000 per day for a month1 penny to start with and then double it each

day for a month

What would rather receive?$1000 per day for a month1 penny to start with and then double it each

day for a month

How fast can a population go? How big can a population get?A group of animals can have

______________ __________________ - which means they do the same thing as the penny example

PROBLEM -

A group of animals can have ______________ __________________ - which means they do the same thing as the penny example

PROBLEM -

What keeps a population under control?Limiting factors -

Examples:Carrying capacity -

# of births = # of deaths so the population won’t get any larger

Limiting factors -

Examples:Carrying capacity -

# of births = # of deaths so the population won’t get any larger

Carrying Capacity

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Factors affecting Population GrowthDensity dependent factors -

Food - more food = Disease -

Ex - Chronic Wasting disease in deer =

Density dependent factors -

Food - more food = Disease -

Ex - Chronic Wasting disease in deer =

Factors affecting Population GrowthDensity Independent Factors -

Weather Floods

Density Independent Factors -

Weather Floods

Species Interaction

When 2 species compete with each other for a particular resource - ______________ ___________________

When 2 species compete with each other for a particular resource - ______________ ___________________

Niches

Each animal in a community has its special role

Each animal in a community has its special role

Predation

Predator -Examples:

Prey -

Examples:

Predator -Examples:

Prey -

Examples:

Predator Adaptations

Predators must be “smart” enough to catch their preyCamouflage - _______________ - wolves

Predators must be “smart” enough to catch their preyCamouflage - _______________ - wolves

Prey Adaptations

Prey wants to avoid being eatenCamouflage -

“Warning coloration” -

Mimicry -

Plants -

Prey wants to avoid being eatenCamouflage -

“Warning coloration” -

Mimicry -

Plants -

Symbiotic Relationship

When _____ organisms live in or on each other

3 types symbiotic relationshipsParasitismMutualismCommensalism

When _____ organisms live in or on each other

3 types symbiotic relationshipsParasitismMutualismCommensalism

Parasitism

1 organisms benefits (________), 1 organism suffers (_________)

Usually the _____________ is smaller than the host

Examples :

1 organisms benefits (________), 1 organism suffers (_________)

Usually the _____________ is smaller than the host

Examples :

Mutualism

Both organisms benefit from the situationExamples:

Both organisms benefit from the situationExamples:

Commensalism

1 organism benefits, the other doesn’t care Examples

1 organism benefits, the other doesn’t care Examples

Disturbances to a Community

Major, sudden changes are called ____________

Natural disturbances -

_________________ - clearing a forest to grow crops, a ship sinking to the ocean floor

Major, sudden changes are called ____________

Natural disturbances -

_________________ - clearing a forest to grow crops, a ship sinking to the ocean floor

Ecological Succession

__________________ - 1st step - small mosses begin to grow on rock and forms the first soils

___________________ - When a disturbance damages a community, but the soil is still there

__________________ - 1st step - small mosses begin to grow on rock and forms the first soils

___________________ - When a disturbance damages a community, but the soil is still there

Succession

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Humans and Species Diversity

________% of the land on earth is used by humans

Clearing the land -

_________________ - species that are moved into a particular area - called __________ _____________

________% of the land on earth is used by humans

Clearing the land -

_________________ - species that are moved into a particular area - called __________ _____________