# Chapter 35 - Populations. Populations Can change over time Must determine the limits of an area Population Density - Ex - _________________________, or.

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Chapter 35 - Populations

Populations Can change over time Must determine the limits of an area Population Density - Ex - _________________________, or _____________________________________ ________ Can change over time Must determine the limits of an area Population Density - Ex - _________________________, or _____________________________________ ________

Question What would rather receive? \$1000 per day for a month 1 penny to start with and then double it each day for a month What would rather receive? \$1000 per day for a month 1 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 wont get any larger Limiting factors - Examples: Carrying capacity - # of births = # of deaths so the population wont get any larger

Carrying Capacity

Factors affecting Population Growth Density 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 Growth Density 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 prey Camouflage - _______________ - wolves Predators must be smart enough to catch their prey Camouflage - _______________ - wolves

Prey Adaptations Prey wants to avoid being eaten Camouflage - Warning coloration - Mimicry - Plants - Prey wants to avoid being eaten Camouflage - Warning coloration - Mimicry - Plants -

Symbiotic Relationship When _____ organisms live in or on each other 3 types symbiotic relationships Parasitism Mutualism Commensalism When _____ organisms live in or on each other 3 types symbiotic relationships Parasitism Mutualism Commensalism

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 situation Examples: Both organisms benefit from the situation Examples:

Commensalism 1 organism benefits, the other doesnt care Examples 1 organism benefits, the other doesnt 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

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 __________ _____________

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