Investigating Resource Availability and Population Investigating Resource Availability and Population Dynamics: The Case of Webster’s Salamanders

Lesson Introduction (10 minutes):

    1.    Introduce the concept of ecosystems and the interconnectedness of living organisms and their environment.
    2.    Explain that ecosystems consist of various biotic (living) and abiotic (non-living) factors, and that the availability of resources within an ecosystem can impact the populations of organisms that live there.
    3.    Introduce Webster’s salamanders as a species that can help us understand the effects of resource availability on populations.

Activity 1: Analyzing Data on Salamander Populations (25 minutes):

    1.    Provide students with data sets or graphs representing salamander population numbers over time in different habitats or ecosystems.
    2.    Instruct students to analyze the data and identify any patterns or trends in salamander populations.
    3.    Encourage students to consider factors such as food availability, habitat quality, and environmental conditions that may influence salamander populations.
    4.    Facilitate a class discussion where students share their observations and interpretations of the data.

Activity 2: Case Study: Webster’s Salamanders (20 minutes):

    1.    Show images or videos of Webster’s salamanders in their natural habitat. (What’s Wild: Websters Salamanders)
    2.    Discuss the specific resource needs of Webster’s salamanders, such as moisture levels, temperature, food availability, and shelter.
    3.    Guide students to brainstorm how changes in resource availability could affect the population dynamics of Webster’s salamanders.
    4.    Encourage students to consider how factors like deforestation, pollution, climate change, and invasive species could impact salamander populations.

Activity 3: Drawing Conclusions and Making Connections (20 minutes):

    1.    Divide the class into small groups.
    2.    Provide each group with a whiteboard or chart paper and markers.
    3.    Instruct groups to summarize their findings from the data analysis and case study, drawing conclusions about the effects of resource availability on salamander populations.
    4.    Encourage groups to make connections between their findings and broader concepts in ecology, such as carrying capacity, ecological niches, and species interactions.
    5.    Facilitate a gallery walk where groups share their summaries with the class.

Conclusion (10 minutes):

    1.    Summarize the key concepts learned about the effects of resource availability on organisms and populations in an ecosystem.
    2.    Emphasize the importance of analyzing and interpreting data to understand ecological patterns and processes.
    3.    Encourage students to continue exploring the complex relationships between organisms and their environment in future studies.

Assessment:

    •    Evaluate students’ participation and contributions during class discussions and group activities.
    •    Review the accuracy and depth of students’ data analysis and interpretations.
    •    Assess students’ ability to draw conclusions and make connections between resource availability and population dynamics.