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Discover how ecosystems work.
Lesson summary:
What’s the big idea?
- What’s an ecosystem?
- What role do plants and water play in ecosystems? Learn how ecosystems work by making a bottle ecosystem.
Outcomes or purpose:
- Students will learn about ecosystems by building a bottle ecosystem and observing what happens.
Grades: K - 6^ Time: 1 hour to assemble
Teacher background:
An ecosystem is a community of living organisms (plants, animals and microbes) in a particular area. Ecosystems also contain non-living components like rocks and landscape, and are affected by sun, weather, temperature, humidity and water. Everything in an ecosystem is linked by nutrient cycles and energy flows.
The whole Earth is a series of connected ecosystems. Ecosystems can be very large or very small! Examples of large ecosystems include prairie grasslands, boreal forests and aspen parkland, such as those found in the Canadian prairie provinces; taiga and tundra ecosystems in the arctic; and marine ecosystems near the ocean. These large ecosystems contain many small ecosystems such as rivers, ponds and sloughs, or even smaller ecosystems like the place underneath a rock or inside a decaying tree trunk. If you have a LGT vermi-composter, indoor garden or an aquarium in your class, they are little ecosystems too.
Every factor in an ecosystem depends on every other factor, either directly or indirectly. Ecosystems have specific needs to function properly and small changes can upset the entire system. For example, a change in temperature in an ecosystem will often affect what plants can grow there. Living creatures that depend on those plants for food and shelter have to adapt to the changes, move to another ecosystem, or they die out. This is why human interference, as a result of pollution, the introduction of invasive species, deforestation and over-hunting, can harm more than just one species.
Materials needed:
**- 4 L Pop bottle with lid
- Scissors
- Tape
- Rocks, pebbles or broken clay peices** - Potting soil (about 2 cups) - Seeds (bean, cat grass, radish, johnny-jump-ups etc.) - Water
A bottle ecosystem is very tiny but can teach us things about how ecosystems work. All ecosystems need light, water and soil. The main living things in a bottle ecosystem are plants and the microorganisms in the soil. Even though your bottle ecosystem is sealed up, the plants and microbes inside it can survive because everything in the ecosystem works together.
Plants play an important role in ecosystems, and especially in the water cycle. In every ecosystem all over the world, water is always moving between lakes, rivers, oceans, the atmosphere and the land. As water moves, it can be a liquid (water), a gas (vapour) or solid (snow and ice). Water moves through four stages :
Evaporation. When the sun heats up the surface of the Earth, the temperature warms up. Warm temperatures cause some of the water from rivers, lakes and oceans to turn into a gas called vapour. Plants also put water vapour into the atmosphere through their leaves in a process called transpiration.
Condensation. As water vapour rises, it cools and turns back into a liquid. Clouds are made up of very tiny water droplets.
Precipitation. When conditions are right, clouds release the water to the earth in the form of rain or snow, also called precipitation.
Collection. Once rain or snow falls back to the Earth, water eventually makes its way back to bodies of water like rivers, lakes and oceans. Some of that water also soaks into the ground where it is taken up by plants. Eventually water either evaporates or is transpirated back into the air by plants and the cycle starts all over again.
- Optional: moss (gathered from outdoors or purchased from a pet store) - Journal
