chapter 35 - populations. populations can change over time must determine the limits of an area...
TRANSCRIPT
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Chapter 35 - Populations
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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 _____________________________________________
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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
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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 -
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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
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Carrying Capacity
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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 =
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Factors affecting Population GrowthDensity Independent Factors -
Weather Floods
Density Independent Factors -
Weather Floods
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Species Interaction
When 2 species compete with each other for a particular resource - ______________ ___________________
When 2 species compete with each other for a particular resource - ______________ ___________________
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Niches
Each animal in a community has its special role
Each animal in a community has its special role
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Predation
Predator -Examples:
Prey -
Examples:
Predator -Examples:
Prey -
Examples:
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Predator Adaptations
Predators must be “smart” enough to catch their preyCamouflage - _______________ - wolves
Predators must be “smart” enough to catch their preyCamouflage - _______________ - wolves
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Prey Adaptations
Prey wants to avoid being eatenCamouflage -
“Warning coloration” -
Mimicry -
Plants -
Prey wants to avoid being eatenCamouflage -
“Warning coloration” -
Mimicry -
Plants -
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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
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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 :
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Mutualism
Both organisms benefit from the situationExamples:
Both organisms benefit from the situationExamples:
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Commensalism
1 organism benefits, the other doesn’t care Examples
1 organism benefits, the other doesn’t care Examples
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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
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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
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Succession
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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 __________ _____________