Pond Dip – Bring an Ecosystem into the Classroom

aquatic beautiful bloom blooming
Photo by Diego Madrigal on Pexels.com

Studying aquatic microorganisms is engaging and very educational.

Here I share how I teach a 7th grade lab on finding protists and microscopic animals in pond water. This may seem daunting if you are not familiar with the organisms or haven’t had the time to organize the activity. I hope that I’ll give you all the information you need for a successful lab.

 

Why take the time for this lab? Well, no one is going to be excited about algae by looking at a picture of it. Algae in the macroscopic world is called POND SCUM, but under the microscope it’s BEAUTIFUL.

Also, many standards can be addressed in a pond dip lab:

  • modeling ecosystems and ecosystem interactions
    • food chains, food webs and trophic levels
    • nonliving and living factors within an ecosystem
  • biological diversity
    • taxonomy and evolutionary relationships among species:
      • single-celled protists
        • algae – single-celled organisms with plant-like characteristics
        • protozoans – single-celled organisms with animal-like characteristics
      • microscopic animals – all multicellular
        • crustaceans, aquatic worms and rotifers
  • cells
    • single-celled organisms are microscopic, but have all of the characteristics of living things
    • microscopic multi-celled organisms such as microscopic crustaceans and worms
  • Using dichotomous keys and technical language – meet Common Core standards for using “key terms” and “domain-specific words and phrases” used in a “scientific and technical context”.
green toad in water
Photo by Darius Krause on Pexels.com

The supplies are simple and usually found in the typical middle school or high school biology classroom. The only things you will need to gather otherwise is the microorganism-rich water and organism keys; I provide you with information on both.

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