Ecosystems and Energy Biology

Vocabulary Autotroph Biomass Community Detritivore Energy Pyramid Food Chain Food Web Heterotroph Omnivore Population Trophic Level

What is Ecology ? The study of how organisms interact with one another and their non-living environment

So Then What is an Ecosystem ? Biosphere Ecosystems Communities Populations Organisms Looking at the chart to the right.. Our BIOSPHERE is the part of the Earth where the organisms exist And an ECOSYSTEM is that area where the living and non-living things interact.

So Then What is an Ecosystem ? Biosphere Ecosystems Communities Populations Organisms Looking at the chart to the right.. A COMMUNITY is different populations that live together in a defined area And an POPULATION is a group of individuals of the same species that live in the same area

Parts of an Ecosystem Examples are: • Plants • Animals • Fungi An Ecosystem is made of BIOTIC and ABIOTIC parts BIOTIC components are the living parts of the ecosystem Examples are: • Plants • Animals • Fungi • Bacteria

Parts of an Ecosystem Examples are: • Water • Air • Temperature An Ecosystem is made of BIOTIC and ABIOTIC Components ABIOTIC components are the NON-living parts of the ecosystem Examples are: • Water • Air • Temperature • Sunlight

Energy for the Ecosystems Every ecosystem on Earth gets its energy from the same source: The SUN !!!

Looking closely at Ecosystems All Ecosystems are made of four components linked by the flow of energy. These components are: • Primary Producers • Consumers • Decomposers • Abiotic Environment

Looking closely at Ecosystems External energy source PRIMARY PRODUCERS CONSUMERS DECOMPOSERS ABIOTIC ENVIRONMENT

Primary Producers Producers make their own food, from abiotic factors, such as sunlight or heat from chemical reactions.

Producers are also known as Autotrophs Primary Producers Producers are also known as Autotrophs Some examples are: • Plants • Algae • Bacteria

Consumers Consumers are organisms that get their energy by eating other organisms

Consumers are also known as Heterotrophs Consumers can be: • Herbivores • Carnivores • Omnivores • Detritivores (Decomposers)

Herbivores eat only plants. Consumers Herbivores eat only plants. Herbivore Examples: • Large Mammals (Such as cattle & deer) • Insects

Carnivores eat other animals Consumers Carnivores eat other animals Carnivore Examples: • Lions, Tigers • Wolves • Sharks • Snakes

Omnivores eat both plants and animals Consumers Omnivores eat both plants and animals Omnivore Examples: • Humans • Bears • Mice • Pigs

Detritivores eat dead plants and animals (also called decomposers) Consumers Detritivores eat dead plants and animals (also called decomposers) Detritivore Examples: • Worms • Beetles • Bacteria • Fungi

Food Chain A Food Chain tells us what eats what in an ecosystem. It shows the series of organisms through which food energy is passed.

Food Chain The arrow means “is eaten by” In this case the dragonfly is eaten by the frog.

Food Chain Remember… ALL food chains begin with a Producer ( Also known as an Autotroph)

Food Web In an ecosystem, there are many producers and consumers. Instead of a food chain, we can use a food web.

Food Web Humans Blue whale Sperm whale Crabeater seal Killer whale Elephant seal Leopard Adélie penguins Petrel Fish Squid Carnivorous plankton Krill Phytoplankton Herbivorous zooplankton Emperor penguin A food web shows the complex relationship formed by the overlapping and interconnecting food chains.

To better understand a food web, we can look at an energy pyramid. An energy pyramid is a way to graph how much energy is passed up the food chain from one organism to the next.

Energy Pyramid Let’s look at the energy pyramid closer. Each layer of the pyramid is called a Trophic Level. A Trophic Level is a level of nourishment in a food chain.

Energy Pyramid Let’s look at the energy pyramid closer. The pyramid first shows us the Producers. Remember… Producers get their energy from the sun. Producers are the first and largest Trophic Level. Producers

Energy Pyramid Let’s look at the energy pyramid closer. Second, we see the Primary Consumers The Primary Consumers get their energy from eating the Producers. Primary Consumers can be either Herbivores or Omnivores. Primary Consumers

Energy Pyramid Let’s look at the energy pyramid closer. Third, we see the Secondary Consumers The Secondary Consumers get their energy from eating the Primary Consumers Secondary Consumers are Carnivores or Omnivores Secondary Consumers

Energy Pyramid Let’s look at the energy pyramid closer. Fourth, we see the Tertiary Consumers The Tertiary Consumers get their energy from eating the Secondary Consumers Tertiary Consumers are Carnivores or Omnivores Tertiary Consumers

Energy Pyramid Let’s look at the energy pyramid closer. Some energy pyramids can have a fifth Trophic Level. Usually this fifth level is humans.

Let’s look at the energy pyramid closer. Biomass is the total amount of living tissue within each trophic level.

Energy Pyramid Let’s look at the energy pyramid closer. Only 10% of the energy from the prior trophic level is passed on. This is because energy is lost to the environment as heat

Energy Pyramid If an energy pyramid consists of plants that contain 500,000 calories of food energy, how many calories of energy would be available to consumers at each of the next three trophic levels? Trophic level Primary producers Tertiary consumers Secondary consumers Primary consumers

Energy Pyramid Primary Consumers: Secondary Consumers: 500,000 cal x .1 = 50,000 calories Secondary Consumers: 50,000 cal x .1 = 5,000 calories Tertiary Consumers: 5,000 cal x .1 = 500 calories Trophic level Primary producers Tertiary consumers Secondary consumers Primary consumers

What does these energy numbers tell us?? Food Web What does these energy numbers tell us?? There are very few Tertiary consumers, because it takes a HUGE amount of food energy to support them. For a large population to exist, it needs to feed from the LOWEST trophic level possible, because there is more food energy available. Trophic level Primary producers Tertiary consumers Secondary consumers Primary consumers

Besides the energy pyramid, we can also have pyramids of: Other Pyramid types Besides the energy pyramid, we can also have pyramids of: Numbers Biomass

Pyramid of Numbers A pyramid of numbers reflects the number of species at each trophic level. For example: if we look at a forest, there may be few rose bushes, but many insects that feed on the tree, with a pyramid like the one below.

For example: Looking at the same forest, the biomass is great. Pyramid of Biomass A pyramid of biomass reflects the total amount of living tissue at each trophic level. For example: Looking at the same forest, the biomass is great.