Ecosystems. Ecosystems. Life Science. By Barbara Keith
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1 Ecosystems Life Science Ecosystems By Barbara Keith
2 Ecosystems An organism is any living thing (plant or animal) All organisms are made up of cells. The cell is the smallest unit of life. Organisms with only 1 cell = unicellular Organisms with many cells = multicellular
3 Animal Cell
4 Cells All cells contain these major structures: Cell membrane - soft, flexible outside covering that controls what goes in and comes out of the cell (gatekeeper) Cytoplasm - the gel-like fluid that fills most of a cell. All the organelles are found here.
5 Organelles of the cell Nucleus - controls everything the cell does Vacuole stores food, water, waste for the cell Mitochondria - energy is made here (Remember the Mighty Mitochondria)
6 Ecosystem An Ecosystem contains all the living (organisms) and non-living parts in the surrounding environment. Make foldable showing: Ecosystems are made up of: Biotic factors = living things Abiotic factors = non-living things
7 Biotic Factors All the living things in an ecosystem Populations all members of one kind of organism that live in a particular area. (This includes microorganisms which are too small to be seen without a magnifier.) Communities groups of different populations of organisms
8 Population vs. community Population Community
9 Abiotic factors The non-living things in an ecosystem Temperature, water, soil, air, sunlight
10 Types of Ecosystems We are going to make a foldable to show both Terrestrial = Land Forests Grasslands Aquatic = Water Freshwater Saltwater Estuaries
11 Terrestrial Ecosystems Forests Many trees, shrubs, grasses and ferns A variety of animals live here Gets more rain than grasslands Temperatures vary based on location of forest
12 Terrestrial Ecosystems Grasslands Fertile (rich) soil Covered with tall grasses Temperatures vary depending on location Common animals = prairie dogs, bison, grasshoppers
13 Terrestrial Ecosystems Wetlands Clean the water Reduce flood risks Provide fish and wildlife habitat
14 Aquatic Ecosystems Lakes and Ponds Bodies of freshwater surrounded by land. Ponds are usually smaller and shallower and temperature of water is the same at top and bottom. Plants and algae grow here. Different kinds of fish, amphibians, ducks, turtles, beavers
15 Aquatic Ecosystems Oceans Large bodies of salt water divided by continents Most organisms live where the ocean is shallow (from shoreline to continental shelf) {Warmer water and sunlight} Plankton, jellyfish, fish, crabs, coral
16 Aquatic Ecosystems Estuaries Found where the freshwater rivers meet the ocean s salt water Contain salt marshes with grasses and plants Animals that live here include crabs, shrimp, birds, muskrats This is the nursery for the ocean
17 What s for Dinner Food! All organisms need energy to live and grow. This energy comes from food. Different organisms get their food in different ways. We are going to make a foldable showing three different groups
18 Producers Plants are producers because they produce their own food (photosynthesis).
19 Consumers Animals cannot make their own food so they must eat plants and other animals. 3 main groups of consumers include: Herbivores animals that eat only plants Carnivores animals that eat only animals Omnivores animals that eat both animals and plants
20 Decomposers These are consumers that get their energy by breaking down dead or decaying matter. Microorganisms, termites, worms, fungi These organisms release nutrients back into the food chain for plants.
21 Food Chain A series of plants and animals in which each organism is a food for the next in the chain. In a typical food chain, plants begin the chain. Interconnected food chains form a food web.
22 Grassland food chain One example of a grassland food chain: sun grass grasshopper toad snake hawk
23 Food Chain Poem Food Chain Who eats what? Who eats who? Who eats me? Who eats you? Food chain shows, What things eat, What eats plants, Who eats meats... Starts with sun, Producers grow, They make food, Don t you know? Consumers come, For energy, Eat those plants. They re quite tasty Food chain might,
24 Poem, continued Bird eats worm A shark will eat, Other fish, That eat seaweed, As their dish... A fox will hunt, That's not news, Eats a mouse, And rabbits too But who eats fox? Food chain shows, A wolf? A bear? How nature goes! Food chains say, What eats who, Who eats me, And what eats you! what is a food chain? Food chains describe which organisms get their energy from which other organisms in an ecosystem. Producers, such as green plants and algae get their energy from the sun and make their own food. Consumers eat producers (such as a rabbit eating grass), but can also eat other consumers (a fox eating the rabbit). When living organisms die, they are broken down by decomposers such as fungi, and the nutrients are returned to the soil where they can support the growth of producers.
25 Predators and prey Predators animals that hunt and kill other animals for food Prey the animal that is being hunted and killed for food
26 Parasite and host Parasite an organism that spends most of its life living on or in another organism (host) usually causing harm Host organisms or cells that serve as a home or source of food for a parasite
27 Limiting Factors An ecosystem only has a certain amount of food, water, space and shelter available to support a certain number of organisms A condition or resource that keeps a population a certain size is the limiting factor. When limiting factors change, population may increase or decrease
28 Population increases May result in overcrowding If there are more plants than usual, populations of animals that eat these plants may increase If the population of predators increases, the prey will decrease If the population of prey increases, the predators will increase also b/c there is more food.
29 Population decreases If the water supply decreases, the organisms that need that water will decrease, then the animals that eat those organisms will decrease also. If organisms no longer have enough space to survive, they will have to move or will die. This can happen because of humans or natural causes.
30 Habitat Destruction The biggest reason for declining populations is habitat destruction by man. Building or cutting down trees impacts every organism that lives in that ecosystem.
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