Lesson 4 – Conducting Halo Salinity Experiment

Course:  Life Science, Integrated Science, STEM

Unit:  Ecological Networks Part 1- Network interactions


See Standards Addressed for all NGSS and WA State (Science, Math and Literacy).  In addition to the aligned objectives linked above, for this lesson, here is a breakdown of:

What Students Learn:

  • Halobacterium are extremophiles thriving in high saline environments.
  • An ecological disturbance in a single abiotic or biotic factor could affect an entire ecosystem.
  • Natural events and human activities affect the Earth’s capacity to sustain biological diversity.
  • Spectrophotometers are used to measure cell density.

What Students Do:

  • Implement a scientific investigation using appropriate technology, multiple measures, proper controls, systematic data collection and safe approaches.
  • Compare, contrast and critique divergent results from their investigations.








 Please note: The Halobacterium culture should have been prepared AT LEAST 4 days prior to beginning the lab with students. The directions for this are located below in the section entitled, “Preparation of the Culture."