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UNIT ONE:General Ecology and

PopulationPart 1: Content

Food Chains, Food WebsEnergy Flow and Trophic Levels.

Time: 5 days

UNIT ONE:Practical RequirementsPart 1: Application1. Construct a Food Chain2. Construct a Food web3. Construct and calculate Energy flow through the energy pyramid.

Time: 5 days

What Is Environmental Science?

• Environmental Science is the study of the air, water, and land surrounding an organism or a community, which ranges from a small area to Earth’s entire biosphere.

• Ecology is the study of interactions of living organisms with one another and with their environment.

• Ecosystem - A community of living and non-living things that work together. (i.e. desert, lake, tree, puddle, etc.) No size requirement.

Biological Organization

From largest to smallest, the biological organization for ecology is:

•Biosphere-Global Sum of All Ecosystems•Biomes- next slide•Ecosystem-next slide•Community•Population•Organism

• Ecosystem - A community of living and non-living things that work together. (i.e. desert, lake, tree, puddle, etc.) No size requirement.

• Biome- The very largest ecosystems. They are:– Tropical Rain Forest– Grasslands– Desert– Deciduous– Tundra– Coniferous Forest (Taiga)-Largest– Chaparral– Savanna– Alpine

Biomes

• Biotic – The living things that shape an ecosystem.

• Abiotic-non-living chemical and physical factors in the. (i.e. light, soil, water, radiation, temperature)

• Habitat – The environment that an organism lives in. (i.e. forrest)

Life Depends on the Sun

• Energy from the sun enters an ecosystem when plants use sunlight to make sugar molecules.

• This happens through a process called photosynthesis.

Life Depends on the Sun

• Photosynthesis is the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to produce carbohydrates and oxygen.

From Producers to Consumers

• Because plants make their own food, they are called producers.

• A producer is an organism that can make organic molecules from inorganic molecules.

• Producers are also called autotrophs, or self-feeders.

• Organisms that get their energy by eating other organisms are called consumers.

• A consumer is an organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources.

• Consumers are also called heterotrophs, or other-feeders.

• Some producers get their energy directly from the sun by absorbing it through their leaves.

• Consumers get their energy indirectly by eating producers or other consumers.

An Exception to the Rule

• Deep-ocean communities of worms, clams, crabs, mussels, and barnacles, exist in total darkness on the ocean floor, where photosynthesis cannot occur.

• The producers in this environment are bacteria that use hydrogen sulfide present in the water.

• Other underwater organisms eat the bacteria or the organisms that eat the bacteria.

What Eats What?

• Organisms can be classified by what they eat.

• Types of Consumers:• Herbivores – Plant Eater• Carnivores – Meat Eater• Omnivores – Eats Plants or Animals• Detritivores – Decomposers/ Scavangers that Breaks down dead plants and animals (detritus) and their waste.

Burning the Fuel

• An organism obtains energy from the food it eats.

• This food must be broken down within its body.

• The process of breaking down food to yield energy is called cellular respiration.

Burning the Fuel

• Cellular Respiration is the process by which cells produce energy from carbohydrates; atmospheric oxygen combines with glucose to form water and carbon dioxide.

• Cellular respiration occurs inside the cells of most organisms.

Burning the Fuel

• During cellular respiration, cells absorb oxygen and use it to release energy from food.

• Through cellular respiration, cells use glucose (sugar) and oxygen to produce carbon dioxide, water, and energy.

Burning the Fuel

• Part of the energy obtained through cellular respiration is used to carry out daily activities.

• Excess energy is stored as fat or sugar.

Energy Transfer

• Each time an organism eats another organism, an energy transfer occurs.

• This transfer of energy can be traced by studying food chains, food webs, and trophic levels.

Food Chains

• A food chain is a sequence in which energy is transferred from one organism to the next as each organism eats another organism.

Food Chains

Food Webs

• Ecosystems, however, almost always contain more than one food chain.

• A food web shows many feeding relationships that are possible in an ecosystem.

Food Webs

Trophic Levels

• Each step in the transfer of energy through a food chain or food web is known as a trophic level.

• A trophic level is one of the steps in a food chain or food pyramid; examples include producers and primary, secondary, and tertiary consumers.

Trophic Levels

• Each time energy is transferred, some of the energy is lost as heat.

• Therefore, less energy is available to organisms at higher trophic levels. (10% passes to the next level and 90% is lost as heat).

• One way to visualize this is with an energy pyramid.

Trophic Levels

• Each layer of the pyramid represents one trophic level.

• Producers form the base of the energy pyramid, and therefore contain the most energy.

• The pyramid becomes smaller toward the top, where less energy is available.

Energy Pyramid

Biomass-The total amount of living or organic matter in an ecosystem. Maximum biomass occurs in producers, and there is progressive decrease in biomass from lower to higher trophic levels. (90/10 rule)Biomass Pyramid:

Pyramid of Numbers- Illustrates the total number of organisms at each trophic level. Highest numbers are at the lower levels.

Productivity of Ecosystems

• Productivity- The rate of production of biomass.

• Productivity of autotrophs such as plants is called primary productivity, while that of heterotrophs such as animals is called secondary productivity.

• Gross Primary Productivity (GPP)- Total amount of energy captured from photosynthesis over a period of time.

• Net Primary Productivity (NPP)- The amount of biomass energy after cell respiration has occurred in plant tissue. GPP-Plant respiration=NPP

• Most Productive Terrestrial Biomes are tropical rain forest, temperate forest, taiga (boreal forest), tundra based on biodiversity and humidity.

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