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Grade 7 Science. Unit 1: Interactions within Ecosystems. What is an Ecosystem?. Complete the activity on page 5: What is an Ecosystem?. What is an Ecosystem?. What is found in an ecosystem? Animals and Plants An organism is any living thing, such as a plant or animal.

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grade 7 science

Grade 7 Science

Unit 1: Interactions within Ecosystems

what is an ecosystem
What is an Ecosystem?

Complete the activity on page 5:

What is an Ecosystem?

what is an ecosystem1
What is an Ecosystem?
  • What is found in an ecosystem?
    • Animals and Plants
  • An organism is any living thing, such as a plant or animal.
what is an ecosystem2
What is an Ecosystem?
  • Places where organisms live are called habitats.
  • Everything that is needed for an organism to survive would be found in a habitat.
what is an ecosystem3
What is an Ecosystem?
  • Non-living things that affect organisms are called abiotic factors.
  • What are some examples?
    • Water, rocks, sunlight, and air
what is an ecosystem4
What is an Ecosystem?
  • Living things that are found in an environment are called biotic factors.
  • Organisms are biotic factors.
  • How do animals affect each other?
    • Feed each other
    • Compete with each other
    • Help each other
activity abiotic biotic factors
Activity: Abiotic & Biotic Factors
  • Cards placed into correct category
what is an ecosystem5
What is an Ecosystem?
  • An ecosystem is all the living and non living things in a particular place.
  • How large is an ecosystem?
    • Ecosystems can be very large, like the ocean or forest,
    • or they can be very small, like under a log or a nest in a tree.
what is an ecosystem6
What is an Ecosystem?
  • There are four ecosystems in Atlantic Canada:
    • Coastlines and oceans
      • Brown seaweeds, barnacles, mussels, starfish, rock crabs
      • Water currents affect temperatures and climate
      • Larger animals include cod, seals, and whales
      • Salt content affect organisms
      • Deep water prevent sunlight from reaching bottom
what is an ecosystem7
What is an Ecosystem?
  • Freshwater: Rivers, Lakes and Ponds
    • Fish such as whitefish and sticklebacks
    • Beavers, muskrats, ducks, and geese
    • Frogs, insects, snails
    • Water plants
    • Rain and snow supply water
what is an ecosystem8
What is an Ecosystem?
  • Arctic
    • Northern Labrador
    • Very low temperatures and little precipitation
    • Permafrost: soil is always frozen one metre below the surface
    • Low shrubs, mosses, lichens and small flowers
    • Caribou, musk ox, wolves, arctic foxes, arctic hares, lemmings
    • Birds during spring and summer
what is an ecosystem9
What is an Ecosystem?
  • Forests
    • Much of Newfoundland and Labrador
    • Summers cool and winters wet
    • Balsam fir, white birch, black spruce, mountain ash
    • Moose, caribou, black bear, lynx, red fox, pine marten, mink
    • Sometimes bogs and marshes
    • Peat (buildup of decaying plant matter)
activity foldable
Activity: Foldable
  • Create a foldable showcasing the ecosystems found in Newfoundland.
what is an ecosystem10
What is an Ecosystem?
  • Most plants and animals have a range of tolerance.
  • Range of Tolerance is the range of conditions within which an organism can live.
    • Ex: heat, light, water, etc.
  • Range of tolerance is the factor that determines where organisms live.
what is an ecosystem11
What is an Ecosystem?
  • Abiotic Factors:
    • 1. Light and light intensity
      • All plants need light to survive.
      • Some plants need more light than others.
      • Animals can survive in dark and light areas.
what is an ecosystem12
What is an Ecosystem?
  • 2. Temperature
    • All animals and plants have a certain temperature that they need to survive.
what is an ecosystem13
What is an Ecosystem?
  • 3. Soil
    • Plants get nutrients from the soil.
    • Plants grow roots into soil.
    • Animals form tunnels for air and water to move through.
what is an ecosystem14
What is an Ecosystem?
  • 4. Air and Wind
    • Windy areas can affect plant growth since these areas tend to be dry.
    • Plants usually grow shorter than normal.
    • Animals that fly can also be affected by the wind.
what is an ecosystem15
What is an Ecosystem?
  • 5. Water
    • All organisms need water to survive.
    • Some organisms can survive with smaller amounts of water.
what is an ecosystem16
What is an Ecosystem?
  • What are biotic factors?
  • Ecologists study ecosystems by first studying a species.
  • A species is a group of organisms that can reproduce to produce similar, fertile organisms.
what is an ecosystem17
What is an Ecosystem?
  • When only one organism is studied, that is an individual.
  • When many organisms of the same species live in the same ecosystem, they make a population.
  • A group of populations which interact and share a common ecosystem form a community.
  • What populations are there in Clarenville?
habitat versus niche
Habitat versus Niche
  • Habitat: the organism’s address; where does it live?
  • Ex. A moose’s habitat is the boreal forest.
niche
Niche
  • Niche: the organism’s job; what role does the organism play in its environment. It includes:
    • where it lives
    • how it obtains food
    • how it affects its environment
niche1
Niche
  • Ex. A moose lives in the boreal forest, it is a herbivore (plant eater), it provides a home for parasites and it provides food for coyotes.
activity think about it seabirds p 26
ActivityThink About It... Seabirds! p. 26
  • Complete the dichotomous key
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