Curriculum Filter Results

Oxygen in the Water

Oxygen is the key to life — most organisms cannot survive without it, even those under water. Seasonal weather patterns and the physical properties of water can affect temperature and dissolved oxygen levels throughout the water column. Why is this important? Because the seasonal weather patterns and cycles are directly related to how much life an aquatic environment can support.

For example, during the summer, bottom water (hypolimnion) can be cut off from new supplies of dissolved oxygen from the air until fall. Therefore, the size of the hypolimnion affects the ecology of a lake. By examining and graphing water temperatures and the amount of dissolved oxygen in a water column, students will be able to make a connection between the life a lake can support to the amount of oxygen found in stratified layers of water.

Objectives:

  • Describe how properties of water are related to productivity in a lake.
  • Describe how dissolved oxygen and temperature levels can influence populations of organisms.
  • Graph dissolved oxygen levels and graph water temperatures.
  • Analyze water temperature versus depth graphs to answer questions.
  • Analyze dissolved oxygen versus depth graphs to answer questions.

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Fish Habitat and Humans

A healthy environment supports a variety of native species. This is especially true for Great Lakes fish. Different species of fish require specific habitats, and loss or alteration of fish habitat can lead to population declines. This lesson explains some of the characteristics of healthy fish habitat and guides students in making their own field observations and scientific predictions. It will require 3 50 minute class periods.

Objectives:

  • Name three basic requirements for fish survival.
  • Name several Great Lakes fish species and their habitats.
  • Explain two ways human activities impact Great Lakes fish habitat and affect the survival of fish and other organisms.
  • Use observations to predict which Great Lakes fish might favor particular habitat.
  • Make purposeful observations of a nearby aquatic area using illustrations, photographs and narratives (See: Activity).

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Environmental Decision Making

Every day we make choices. We decide simple things like what to wear, what to eat, or how much time to allow for homework. Some decisions, however, require us to think critically and consider the potential consequences of our actions. When it comes to making environmental decisions there is often no clear right or wrong. However, many factors must be considered, especially since the environment is held in the public trust. When making environmental decisions, it often means the decision you are making doesn’t just affect you — and it can have very long-lasting effects.

Objectives:

  • Discuss land use practices that affect Great Lakes wetlands.
  • Make decisions and recognize personal priorities with regard to wetlands.
  • Describe some of the economic factors that often drive land use decisions.

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