unit 1 ecology powerpoint (goal 5)
DESCRIPTION
A huge review powerpoint for the entire Ecology unitTRANSCRIPT
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EcologyInteractions Between Organisms and their Environments
Mr. BroderickNC SCOS Goal 5
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Lesson #1: Living and non-living parts of an Ecosystem
• Objectives– Identify abiotic and biotic factors in a given
description of an ecosystem interaction– Generate an example relationship using abiotic
and biotic factors– Determine if a solution is acidic, basic, or neutral
given its pH– Set-up an experiment to test the effect of pH on
the sprouting of a lima bean• Develop hypothesis, procedure
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Key Vocabulary to Define
• Ecosystem• Abiotic• Biotic• pH• Acidic• Basic• Neutral
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The organization of our world!
The earth is a biosphere
Ecosystems are the living and nonliving things in an area
Populations are a group of one type of organism living in an area
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Hierarchy of Biology
• Molecules• Organelles
• Cells• Tissues• Organs• Organ systems• Organisms• Populations• Communities• Ecosystems
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What is ecology?
• Ecology: The study of the relationship between organisms and their environment
• Example problems that ecology handles: – How do humans affect the atmosphere and
contribute to global warming? – How does the population of wolves in an area
affect the population of rabbits?– Do clownfish (Nemo!) and anemone benefit each
other?
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Why does ecology matter?
• Ecology: The study of the relationship between organisms and their environment
Scenario: Imagine that there is an insect that lives on peanut plants growing on farms in Northampton County. Is there a way that we can limit insect damage to the peanut crops in order to decrease the price of peanuts at the store by 20 cents per pound?
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How do we study environments?
• Quadrant Studies: Tracking changes in a small section of the environment
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How do we study environments?
• Sampling: Only measuring a small, random part of an environment
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Ecosystems
• Ecosystem: An area containing an interaction of living and non-living factors in an area/region
• Example ecosystems: – North Carolina forests (pine forests)– Coastal Plains of NC– Outer banks coastal water ecosystem– Lake Gaston ecosystem
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What is in an Ecosystem?
• Abiotic Factors: The non-living parts of an ecosystem– Rocks, soil, temperature, gases in the air, light
• Biotic Factors: The living parts of an ecosystem– Plants, animals, bacteria, fungus• Producers: use light to make their own energy• Consumers: eat other organisms to obtain energy• Decomposers: break down dead organisms for energy
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Word Parts!
• Placing an “a” before a word makes it an opposite or not
– Abiotic (not biotic; not living)– Atypical (not typical)– Anonymous (no name)
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Biotic• Humans• Bacteria• Fungus• Plants• Insects• Amphibians• Reptiles• Mammals• Birds
Abiotic• Water• Soil• Wind or Air• Gases
– oxygen, carbon dioxide, nitrogen
• Temperature• Sunlight• pH
– Acid or base
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Abiotic or Biotic?
Biotic (plant)
Abiotic (rainwater)
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Abiotic or Biotic?
• The air temperature is 45 degrees F = • The soil is made of rocks and minerals =• A bird lays eggs =• Bacteria break down dead organisms = • The pH or the water is 2 (acidic) =
abioticabiotic
abiotic
bioticbiotic
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Abiotic or Biotic?Biotic Biotic BioticAbiotic
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Which of the following is a relationship between abiotic and biotic factors?
A) The rain on an open field washes away soilB) A hawk hunts a mouse and swoops down into
the forest for the killC) A lake has very acidic water which causes
many fish populations to dieD) A deer grazes in a field of grasses
Abiotic
Biotic
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Independent Work
• Read your scenario card• Identify the abiotic and biotic factors in the
scenario• Now, find others with your letter and check
your work.
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Mini-Lesson: pH
• pH: the measurement of how acidic, basic, or neutral a solution is
1 ------------ 4 ----------- 7 ------------ 11 ------------- 14Strong Acid(very acidic)
Weakly Acidic
Neutral
Weakly Basic
Strong Base(very basic)
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Guided Examples• Vinegar– pH of 4
• Baking Soda– pH of 8-9
• Tap water– pH of about 7
• 1 M HCl (hydrochloric acid)– pH of about 1
• 1M NaOH– pH of about 14
Acidic
Acidic
Basic
Basic
Neutral
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Guided Examples
• Which is more acidic?A) pH of 2B) pH of 5C) pH of 7D) pH of 11
• Which is more basic?A) pH of 2B) pH of 5C) pH of 7D) pH of 11
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A scientist performs an experiment to see if acids have an effect on the health of a particular type of plant. Three sets of plants were treated with acidic solutions of known pH while the control set was treated with a solution of neutral pH 7.
What is the best conclusion for this experiment?
A. Acid has no effect on the health of this type of plant
B. High acidity is helpful to this type of plant
C. Low acidity is harmful to this type of plant
D. High acidity is harmful to this type of plant
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Energy Transfer in an Ecosystem
NCSCOS 5.02b
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Food Chains
• A food chain shows the flow of energy between the organisms in an environment
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Food Chains
• Notice that the arrow points from the organism being eaten to the organism that eats it.– Like the burger you eat goes into you
Plants Cow (burger) Human
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What do the arrows in the food chain below indicate?
A. SunlightB. Energy flowC. Heat transferD. Toxins
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What is energy?
• The energy that is transferred in an ecosystem is stored in carbon-compounds, or organic compounds.– Organic compounds: molecules that contain a
carbon atom• Carbohydrates: glucose, starch, cellulose (mostly plants)• Proteins: the muscles of animals (steak!)• Fats: in muscle of animal tissues (fatty steak!)
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Food Webs
• When we put many food chains together in one ecosystem, it is called a food web
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Food Webs
• Food webs show the direction that energy flows in an ecosystem.
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Energy Moves in a Food Web
Plants make glucose from light
Some animals get glucose from plants
Other animals get energy from the fat and protein in other animals
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Parts of a Food Web
• Producers: organisms that use light to store energy in organic compounds. – (examples: plants, algae, phytoplankton)
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Parts of a Food Web
• Where are the producers in the food web below?
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Parts of a Food Web
• Consumers: organisms that eat other organisms to get organic compounds that they use for energy – (examples: humans, cows, insects, birds…)
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Parts of a Food Web
• Where are the consumers in the food web below?
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Parts of a Food Web
• Tertiary consumers: organisms that eat secondary consumers for energy
• Secondary consumers: organisms that eat primary consumers for energy
• Primary consumers: organisms that eat producers to obtain energy compounds
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Producer
Primary Consumer
Secondary Consumer
Tertiary Consumer
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How is energy stored and transferred in an ecosystem?
A. In lightB. In oxygen and carbon dioxideC. In carbon compounds like glucoseD. In the process of decomposition
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Which of the following organisms is a primary consumer in the ecosystem shown?
A. HawkB. RabbitC. Mountain lionD. Frog
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Population Impacts in a Food Web
• If the population of organisms at any level of the food web changes, it will affect the population at other levels
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Population Impacts in a Food Web
• If the population of producers decreases, then the population of primary consumers will decrease if they don’t have enough food.
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Population Impacts in a Food Web
• If the population of primary consumers decreases, then…– The producers will increase because there are less
consumers eating them– The secondary consumers will decrease because
there is less food for them
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Which organism would be most affected if the cricket population decreased?
A. SnakeB. DeerC. FrogD. Hawk
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Energy Pyramids
• Energy Pyramids show the amount of energy at each level of a food web– Trophic Level: the total amount of energy in all
organisms at one level in the food web.
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Energy Pyramids
• More energy at the bottom, decreases as the pyramid moves up the food web
More Energy
Less Energy
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Energy Pyramid Labels
Producers
Tertiary Consumers
Primary Consumers
Secondary Consumers
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Energy Transfer in Energy Pyramids
• Each trophic level of the energy pyramid supplies energy to the level above it.
• Each transfer loses 90% of the energy• Only 10% of the energy at a level is passed to
the next level up!
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Energy Transfer (percents)
100%
0.1%
10%
1%
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Energy Transfer (calories)
1,000 calories
1 calorie
100 calories
10 calories
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Energy Transfer in Energy Pyramids
• We can say that the energy transfer from level to level is inefficient– (not a lot of the energy at each level makes it up)
• This means that there can’t be many levels ina food web or pyramid– The amount of energy decreases, and it cannot
typically support organisms at higher levels than tertiary consumer
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Why are there a limited number of energy levels in an energy pyramid or food web?
A. Energy transfer is very efficientB. Energy is captured as heatC. Energy transfer is inefficientD. Energy is not transferred in a food web
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Energy Transfer and Flow
NCSCOS 5.02a, 2.05bc
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How does energy enter the food web?
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Better question… where does the weight of a producer come from?
How does this... become this?
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Photosynthesis
• Photosynthesis: a toxin process that occurs in producers and converts light, carbon dioxide, and water into glucose (sugar) and oxygen.
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Carbon Dioxide
Water Glucose OxygenSunlight
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More Photosynthesis
a. Photosynthesis removes carbon dioxide from the air.
b. The carbon dioxide in the air is the building block for glucose.
c. The light energy helps bond CO2 and H2O together to make glucose.
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• The energy in light is now stored in the glucose molecule
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Light CO2 H2O
Glucose O2
Starch
Fat(nuts)
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How do consumers get energy?
• Digestion of organic molecules– Consumers eat other organisms to obtain organic
molecules, which are forms of stored energy.– Energy is stored in the bonds of the molecules.
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The Carbon Cycle
NCSCOS 5.02a
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Carbon Cycle
• Carbon is found throughout the environment– Carbon is found in the atmosphere and in water as
carbon dioxide (CO2)– Carbon is found in organisms as organic
molecules, like glucose (sugars) and fats– Carbon is found buried in the ground as fossil fuels
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Carbon Cycle
• Carbon is cycled, or moves1) Atmosphere: Carbon is in the form of CO2
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CO2
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Carbon Cycle
2) Producers: Use photosynthesis to make sugars from CO2 in the atmosphere (carbon is moved!)
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C6H12O6
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Carbon Cycle
3) Consumers: Eat organic molecules and release CO2 into the atmosphere during respiration, or die and go into the soil
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CO2
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Carbon Cycle
4) Soil: decomposers break down organisms, releasing carbon into the atmosphere OR trapping it in the ground (fossils)
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Carbon Cycle
5) Fossil Fuels: carbon from some dead organisms are trapped as fossil fuel until we burn it
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Carbon Cycle Stations
• Start at one of the stations• Make your way to each different station based
on a correct path through the carbon cycle• If you can go to two different places, choose
between them and then go back• Write all answers on your sheet!• After you are done, explain to your partner the
“story” of the carbon cycle, and have them explain back to you!
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Greenhouse Effect and Global Warming
Greenhouse Effect• Heat is trapped near the Earth’s surface
because once light gets in, it warms the surface but cannot escape out of the atmosphere.– It is trapped by the gases in the atmosphere, like
CO2
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Global Warming
Global Warming• The Earth has been warming on average.• Could be due to increased CO2 emissions into
the atmosphere, which enhances the greenhouse effect and traps extra heat.
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Global Warming
Excess CO2 Enhanced Global Warming
GreenhouseEffect
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Relationships in an Ecosystem
NCSCOS 5.01
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Symbiosis
• Symbiosis: a long-term relationship between two organisms in an ecosystem.
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Types of Symbiosis
• Mutualism: both organisms benefit from their relationship
• Commensalism: one organism benefits, and the other is unaffected
• Parasitism: one organisms benefits, and the other is harmed
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Symbiosis Summary
Relationship Type Species A Species B
Mutualism + +
Commensalism + 0
Parasitism + -
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Name That Symbiosis• Leeches feed off of the lamprey below, and
eventually cause it to die.
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Name That Symbiosis• A clown fish lives among the sea anemone.
The clown fish gains protection, but the anemone is neither harmed nor helped.
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Name That Symbiosis• Ox-peckers live on the heads of the ox, eating
insects and keeping the ox clean. The birds also get a place to live.
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Example: The Malaria Parasite
• Species: Plasmodium Vivax• Organism: Protist• Disease: Malaria, which is prevalent in Africa
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A. Plasmodium Vivax is a one-celled organism that is transmitted to humans through the bite of the female Anopheles mosquito
B. It enters liver cells and begins to reproduceC. The reproductive cells infect blood cells.D. Which causes them to lyse or burst.E. The reproductive cells can be picked up by
another mosquito, where they reproduce (G) and are transmitted to another human (H)
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Population Growth and Overpopulation
NCSCOS 5.03
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Populations
• Population: the number of organism from one species that live in a specific area– Examples: the human population in different cities,
the squirrel population in a forest, the grass population in a meadow
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Populations
• Populations are affected by many resources. These include:– The amount of food available in an area– The amount of sunlight (if it is a plant population)– The amount of water– The competition for food/shelter– The predators in an area
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Population Growth Graphs
A: Slow growth as a population begins to grow
Birth Rate > Death Rate
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Population Growth Graphs
B: Exponential growth as population grows rapidly
Birth Rate > Death Rate
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Population Growth Graphs
C: Slow-down of growth as population maxes out its resources, like food, water, or light
Birth Rate > Death Rate
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Population Growth Graphs
D: Population reaches the maximum number supported by environment, the carrying capacity
Birth Rate = Death Rate
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Carrying Capacity
• Carrying Capacity: the maximum number of organisms in a population that are supported by the environment
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Population Growth GraphsCarrying CapacityReaching Limit
of Resources
Exponential Growth, no limiting resources
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Carrying Capacity
• Populations are typically limited by resources– They reach carrying capacity when there aren't
enough resources to keep growing. – Birth Rate = Death Rate.– Logistic Growth!
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Unlimited Growth
• If there are no limiting resources, populations grow exponentially.
• Birth Rate > Death Rate
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Decline
• If population birth rate < death rate, the population will go down!
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Which of the following graphs shows a population that is free of limiting factors?
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Which of the following graphs shows a population that has reached carrying capacity?
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How would a scientists determine the growth rate of a population?
A. Birth Rate + Death RateB. Birth Rate – Death RateC. Birth Rate x Death RateD. Birth Rate / Death Rate
Click To Go Back and Analyze The GraphsIn Terms of Birth And Death Rates (with the class)
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What statement best describes the population shown in the graph below?
A. Birth rate = Death rateB. Birth rate < Death rateC. Birth rate > Death rateD. Birth rate = 0
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What statement best describes the population shown in the graph below at time “t”?
A. Birth rate = Death rateB. Birth rate < Death rateC. Birth rate > Death rateD. Birth rate = 0
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Predator vs Prey
• Predator and Prey populations can affect one another1. As prey increases, predator will increase in
response2. As predators increase, prey will decrease3. As prey decrease, predators will decrease
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POPULATION TASK
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POPULATION TASK
• Deer control is a major issue in North Carolina• We are going to work as small groups to figure
out the problems concerning deer management
• We will also brainstorm solutions to the problem.
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POPULATION TASK
1) What are the effects of an overpopulation of deer? Why is it a problem?
2) What are some natural ways to control the deer population
3) What are some ways that humans can help control the deer population?
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Human Population and Impact
NC SCOS 5.03
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Objectives
• We can analyze the growth patterns of the human population
• We can explain the impacts of deforestation, pollution, and resource overuse on the environment
• We can inform the public about the dangers of human impacts and how to avoid resource overuse
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Human Population
• Human population is currently about 6.8 billion– Human population growth has been exponential
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Population Pyramid Graphs
• Developing countries tend to have high growth rates, whereas developed countries tend to have stable growth.– Population age distribution• Larger at the bottom = more future growth• Equal at each age = stable growth or even decline
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• Population age distribution• Larger at the bottom = more future growth• Equal at each age = stable growth or even decline
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Overpopulation: The Bad
• The problems with overpopulation include abuse of resources:– Deforestation– Fossil Fuel Overuse– Freshwater Overuse– Pollution– Lack of adequate food– Non-native species
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Deforestation
• Cutting down forests leads to a loss of biodiversity: not as many different species in an area– Can affect local food webs, other species, and
even medicine!
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Fossil Fuel OveruseBurning Fossil Fuels
Excess CO2
in the air, traps heat
Greenhouse effect enhanced
Global warming
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Freshwater Overuse
• Poor water quality, not enough freshwater in areas of need
• Polluted runoff from factories
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Pollution
• Acid rain:– Sulfur and nitrogen gases released from factories
into the air – Sulfur dioxide: SO2
– Falls in rain drops, slowly impacts pH of water, soil, etc.
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Pollution
• Ozone Layer Destruction– CFCs: chlorofluorocarbons – released into the air
through old refrigerator and spray cans, destroy ozone layer.
– Low ozone leads to high UV radiation– UV radiation: can cause skin cancer through
mutation
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Why you should wear sunblock!
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Food
• Lack of food sources• Most important in poor, developing countries
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Introducing Non-native species
• Putting species into new ecosystems that aren’t supposed to be there– The introduced species generally outcompete, or
do better, than the native species. – Example: pythons in the everglades.
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What Can We Do?
• Use renewable resources for energy– Water, wind, solar, and geothermal energy
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What Can We Do?
• Reduce carbon dioxide emissions• Reduce water waste• Investigate factories and their pollution levels• Increase public awareness of the issues
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What Can We Do?
• Promote sustainable practices– Using renewable energy, rotating crops, avoiding
pesticides and toxins, making sure we keep fishing populations high, conserve resources
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Bioaccumulation
NC SCOS 5.03, 5.02b
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Quick Vocabulary
• Autotroph: makes its own energy, a producer• Heterotroph: gets its energy from somewhere
else, a consumer
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Quick Vocabulary
• Accumulate: to gain over time
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Bioaccumulation
• Bioaccumulation: the buildup of toxins in top consumers after eating many smaller organisms in a food web – Also called biomagnification or bioamplification
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Bioaccumulation• Imagine that a toxin, a pesticide, was sprayed
on the grass in the food web below. It cannot be released by the plant and is always stored.
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http://www.ruralni.gov.uk/print/index/publications/press_articles/beef_and_sheep/archive-10/grass-attack.htm
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Bioacummulation• Each level of organisms above the grass in the
food web will accumulate more and more of the toxin because they eat so much of the level below them
• For example, the mouse eats a large amount of grass, and stores all of the toxins in its body. Then the snake eats many mice, storing all of their toxins. Finally the hawk eats many snakes and stores all of their toxins in its body
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Bioaccumulation
Eats 1,000 grasses = .001g
Eats 100 mice = .1g
Eats 10 snakes= 1g
1 grass has 0.000001g
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Bioaccumulation
More toxin, concentrated
Even more toxin
Highest toxin levels
Lots of toxin, spread out
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Why is biomagnification a problem?• What do you think?– Depends on the type of toxin– If the toxin is toxic, it might cause problems with
the functions of an organism• Impairs reproduction• Kills off members of a species• Prevents organisms from reproducing
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What happens to the food web?• What do you think?– Decreased top consumers means more low level
consumers– More low level consumers means increased
amounts of the toxic toxin!– The top level consumers don’t stand a chance!
• Are we top level consumers? Can this happen to us?
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