HSIE Teachers - HSC Geography: Ecosystems at risk
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Nature and Rate of Change

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Climate change
Climate change is resulting in a milder, shorter winter season and longer, warmer summers. Average yearly arctic temperatures are increasing. The shrubs are growing taller on the tundra and the surface temperature of water in Hudson Bay has increased by 3 degrees in the past 20 years. Climate change is likely to change migratory patterns, population numbers and physical characteristics of species.

The reduction in the thickness of sea ice, is making it difficult for polar bears to hunt for their primary dietary staple seals. In turn, this is changing polar bear feeding patterns, migration paths and many are experiencing a reduction in body weight. Bears are staying on shore longer to wait for the ice to form.


Migratory birds are changing their movement patterns.
Click to read As polar bears wait, let's talk about ice.

Thawing permafrost
Increased temperatures are resulting in sea ice melts and reduced ice cover on Hudson Bay. Permafrost melts are likely to result in increased decomposition and microbiotic activity and release of greenhouse gases like carbon dioxide and methane.

Tourism
Tourism in and around Churchill focuses on polar bears, beluga whales, nature photography and the Aurora Borealis. 
​While activities are intended to minimise human impacts on wildlife, the actions of individuals are difficult to predict and control. Some passengers, in trying to attract the attention of bears for better photographs may bang on the side of the tundra buggy, hiss or whistle to encourage the bear to move. Bears are exposed to the tundra vehicles from around 9am to 3pm each day. In periods where there are low polar bear numbers, multiple vehicles will crowd around the one bear or family of bears.


In attempts to ensure polar bear viewing tundra buggies may use any tracks or trails that are available rather than using the roads designed for the purpose. This could result in erosion of tracks or destruction of vegetation.
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  • Home
    • Assessment
    • Assessment 1 Scaffold
    • Extended Responses
  • Ecosystem Management
    • Biophysical Interactions >
      • Biophysical Interactions extended response
    • Vulnerability and Resilience >
      • Environmental stress extended response
    • Importance of management and protection >
      • Ecosystems Research task
    • Evaluation of management strategies >
      • Evaluating management strategies
      • Evaluating - sample
      • Evaluating - scaffold
    • Mini case studies
    • Ecosystems - ESL Support
  • Tundra
    • Tundra - spatial patterns - analysing photos and maps >
      • Tundra glossary
      • Tundra - Virtual fieldwork
    • Tundra - Biophysical interactions >
      • Tundra - Churchill biophysical interactions
      • Skills: Climate graphs
    • Nature and Rate of Change >
      • Tundra - Climate Change Infographic
    • Human Impacts >
      • Tundra - Cause and Effect
      • Tundra Connections
    • Tundra - Management >
      • Evaluating Management Strategies
      • Tundra - radio collar tracking
  • Intertidal Wetlands
    • Case Studies >
      • Towra Point
      • Homebush Bay
    • Spatial patterns
    • Biophysical Interactions >
      • Weather and climate
      • Geomorphic and hydrological processes
      • Biogeographical processes
      • Adjustments to natural stress
      • Homebush Bay - Biophysical Interactions
    • Nature and rate of change
    • Human impacts >
      • Towra Point - Human Impacts
      • Towra Point - Human impacts activity
      • Homebush Bay - Human Impacts
    • Management practices >
      • Towra Point - Management Strategies
      • Homebush Bay - Management Strategies
    • Intertidal Wetlands Revision Questions
    • Intertidal Wetlands - Fieldwork >
      • Towra Point excursion
  • Coral Reefs
    • Spatial patterns
    • Biophysical Interactions >
      • Weather and climate
      • Geomorphic and hydrological processes
      • Biogeographical processes
      • Adjustments to natural stress
      • Coral Reef Triangle
    • Nature and rate of change
    • Human Impacts >
      • Coral Triangle - Human Impacts
      • Great Barrier Reef - Human Impacts
    • Management practices >
      • Traditional Management Practices
      • Coral Triangle - Management
      • Great Barrier Reef - Management Strategies
    • Coral Reefs - Fieldwork >
      • Coral Triangle - fieldwork
      • Fieldwork - Lizard Island Virtual Fieldsite.
      • Great Barrier Reef excursion
  • HSIETeachers