- The fish, the algae, and the decomposers require oxygen for respiration.
- The ecosystem is diverse and supports a variety of fish species. The water is clear and clean.
- Phytoplankton, zooplankton, and decomposers.
- Feces from fish, dead animals, dead plant material.
- a. This would decrease O2 levels because cyanobacteria grow more when N and P are added; they will die and the decaying material will be doing respiration, which consumes O2.
- b. This would increase O2 levels because the amount of O2 is being produced by photosynthesis from the increased plant growth.
- c. This would decrease O2 levels because the decomposing organic matter from the dead organisms will consume O2 through respiration.
Parent Tip: Review the logic above to help your child master the concept of eutrophication worksheet.
