Finish Your Levels of Organization Pyramid: Remember each Layer is based on size
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Finish Your Levels of OrganizationPyramid:Remember eachLayer is based on size
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Quiz
1. What basic needs are provided by an organisms habitat?
2. List these terms in order from smallest unit to largest:
Population, organism, ecosystem, community3. Why do ecologist study biotic and abiotic factors in an ecosystem.4. Would all the insects of a forest be consisdered a population? Why / why not?5. List two abiotic factors?
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Populations
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Fold your paper“hotdog” Right to left
Direct Observation
Indirect Observation
Sampling
Mark and Recapture Studies
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Direct ObservationMost obvious means of determining size is to count one by one.
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Indirect Observation
~ Sometimes organisms are too small or too hard to find.~ Observing their tracks or other signs rather than counting.
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Sampling
Most cases there are too many organisms in an are to count.Take a set area, estimate the number in the area and multiply by the number of areas.
Count 8 red maples in a 10 meter by-10-meter area of the forest. If the entire forest were 100x that size, you would mulitply your count by 100 to estimate total population, 800 red maples.
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Mark and recapture
Catch a group of animals – tag themCatch a second group of animals –tag them
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Changes In Population Size
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Births and Deaths
Population Equation
Immigration and Emigration
Graphing Changes in Population
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Populations can change in size when new members enter the population or when members leave the population
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Births and Deaths
Birth rate of a population is the number of births in a population in a certain amount of time.
Death rate is the number of deaths in a certain amount of time.
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The population Equation
If birth rate > death rate, population size increases
If death rate is > birth rate, population size decreases
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Immigration and emigration
• Immigration means moving into a population
• Emigration means leaving a population
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Graphing changes in population
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Limiting Factors
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Food
space
Weather
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Limiting factor is an environmental factor that prevents a population from increasing.
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Food
Limiting factor when food become scarce.
No matter how much shelter, water and other resources are found, population will not grow without right amount of food.
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Space
Space is often a limiting factor of population because there is not enough room to repopulate
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Weather
Weather conditions such as temperature and amount of rainfall can also limit population growth.
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Watch this videohttp
://www.learner.org/courses/envsci/unit/text.php?unit=4&secNum=1
Watch this video: summarize in one paragraph what its teaching:
http://studyjams.scholastic.com/studyjams/jams/science/ecosystems/ecosystems.htm
Watch this video: summarize in one paragraph what it is teaching (make sure to describe the difference between
secondary and primary succession)http://studyjams.scholastic.com/studyjams/jams/science/ecosystems/changes-ecosystems.htm Click on Ecosystem Terms / Ecosystem Quiz write the vocabulary word and definition• http://www.neok12.com/Ecosystems.htm