Ecology Chapter 20 Energy in Ecosystems Lesson #3 Science 7 Mr. Nigh Science 7 Mr. Nigh

Producer – Any kind of green plant that makes its own food These organisms use sunlight, carbon dioxide, and water through photosynthesis to make their food. Examples: plants, algae and some bacteria

Photosynthesis and Chemosynthesis Photosynthesis – is a series of chemical reactions that convert light energy, water, and carbon dioxide into food energy and give off oxygen Chemosynthesis – is a process during which producers use chemical energy in matter rather than light energy to make food

Chemosynthesis Chemosynthesis is the process by which food (glucose) is made by bacteria using chemicals as the energy source, rather than sunlight. Chemosynthesis occurs around hydrothermal vents and methane seeps in the deep sea where sunlight is absent

Consumer - A living thing that gets its energy by eating producers or other living things. Consumers cannot use the sun’s energy directly like producers. Instead they must eat producers or other animals to obtain energy.

Four Types of Consumers Herbivore - a consumer that eats plants. Carnivore - a consumers that eats animals. Omnivore - eats both plants and animals. Examples : Grasshoppers, antelope, prairie dogs, bison, gophers, cows, and mice. Examples: frogs, coyotes, lions, sharks. Examples: humans, bears and turtles Detritivores – eat the remains of organisms

Decomposer (Detritivores) - A living thing that gets its energy by breaking down the remains of living things that have died. Example: bacteria, fungi, millipedes, slugs, and snails Scavengers like vultures, insects, and crabs feed on large quantities of dead or decaying organisms. Decomposers feed on other members of the ecosystem that have died, recycling the nutrients in the process. If you have a compost pile, it is the work of decomposers that turns the leaves and food leftovers into soil.

Energy from the Sun is captured and stored as chemical energy in food by organisms called Producers. Consumers get energy by eating, or consuming, other organisms. Decomposers break down dead plants and animals into simpler compounds. The Flow of Energy

Food Chains Organisms get the energy they need from food. A food chain is a model used to show the feeding relationship between a single producer and a chain of consumers in an ecosystem. In a typical food chain, a plant is the producer that is eaten by a consumer such as an insect, then the insect is eaten by a second consumer such as a bird.

In this food chain, the leaf is the producer. Energy flows from the leaf to the caterpillar that eats it. The caterpillar is the primary consumer in this food chain because it is the first to feed. Energy next moves from the caterpillar to the bird. The bird is a secondary consumer. When the fox eats the bird, it takes energy. The fox is the tertiary consumer or third feeder. The final link in a food chain is occupied by bacteria and fungi that act as decomposers. These organisms feed on and break down the remains of the fox when it dies.

Food Webs A food chain shows only one energy path in an ecosystem. Few organisms eat just one kind of organism, therefore simple food chains are actually rare in nature. Most consumers eat a variety of foods and can be eaten by a variety of other consumers. Therefore, food webs more accurately show the energy pathways possible in an ecosystem. A Food Web is a system of several interconnected food chains.

Energy Pyramid An Energy Pyramid is a graphical model of energy flow in a community. The different levels represent different groups of organisms that might compose a food chain. From the bottom-up, they are as follows: Tertiary consumers (Trophic Level 4) — eat the secondary consumers Secondary consumers (Trophic Level 3) — eat the primary consumers, which makes them carnivores Primary consumers (Trophic Level 2) — eat the producers, which makes them herbivores in most communities Producers (Trophic Level 1) — bring energy from nonliving sources into the community

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Biomes Every plant or animal lives in a biome. A biome is a region with a distinct climate, a dominant type of plants and specific animals that are characteristic of the region. A biome does not have a clear boundaries. Biomes overlap and characteristics change gradually between biomes.

Tundra Taiga Grasslands Deciduous Forest Deserts Savannah Tropical Rainforest Mountainous Alpine

Coniferous Forest Biome ( Taiga) Characteristics: northern forest with cold climates long harsh winters damp ground and fog Plant & animal life: coniferous trees such as spruce, pine and fir bears, wolves, beavers, small mammals, insects

Tundra Biome-Arctic Arctic tundra The arctic tundra occupies earth's Northern hemisphere, circling the North Pole all the way down to the evergreen forests. The arctic tundra sees little rainfall, like the cold deserts of Russia. The soil of the arctic tundra is poor in nutrients, which accounts for the low amount of vegetation. There is an under-layer of soil called permafrost which remains completely frozen at all times, allowing little room for deep rooting plants and trees.

Tundra Biome- Alpine Alpine tundra The alpine tundra biome exists on rocky mountaintops and is very similar to the arctic tundra except for a conspicuous lack of trees. Because trees cannot grow at this high altitude, most of the alpine tundra plant life consists of shrubbery and small leafy plants such as alpine bluegrass which serve as dinner to a variety of grazing animals such as bighorn sheep and mountain goats.

Desert Biome Characteristics: hot temperatures, cold nights less than 10 inches or rain annually organisms adapted to limited water little plant life Plant & animal life: succulent plants that store water lizards, snakes, rabbits, mice, insects, birds, camels

Grassland Biome (Prairie and Savanna) Characteristics: rich soil hot, dry climate herds of grazing animals Plant & animal life: thick (tall) grasses gazelles, zebras, wildebeest, bison, lions, hyenas, vultures, small burrowing animals Prairie Grassland Biome Savanna

Deciduous Forest Biome Characteristics: found in temperate climates 40 inches of precipitation annually leaves on the trees change color and drop off each year. Plant & animal life: mixed deciduous trees small mammals, deer, birds, rodents, foxes, insects, wildflowers Temperate deciduous forests are forests in cool, rainy areas. They contain trees that lose their leaves in fall and re-grow them in the spring. They have four distinct seasons: Spring, Summer, Fall, and Winter.

Tropical Rainforest Biome Characteristics: found near the equator precipitation over 100 inches annually consistently hot climate, average 80◦ F temperature Plant & animal life: tall evergreen trees, fruit trees, vines, leafy plants birds, monkeys, leopards, amphibians, snakes, insects, frogs

Fresh Water Biome Characteristics: found in rivers, streams, lakes, ponds, swamps, marches rich in plant and animal life living in and near water Plant & animal life: Green algae, pond weed, flowers, cattails fish, crayfish, snakes, turtles, birds, alligators, frogs, insects

Kettle lakes in Minnesota formed by melting glaciers

Estuary- the lower end of a river that feeds into an ocean The place where freshwater and saltwater meet. Marshes and wetlands are two types of estuaries.

Ocean Biome Characteristics: found in Earth’s oceans and seas organisms are adapted to salt water Plant & animal life: algae, phytoplankton fish, seals, whales, sharks, sponges, mollusks, sea anemones, jelly fish, coral, sea urchins and starfish

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