Geology 230

Groundwater/ Surface Water Interaction

California State University, Sacramento

Week 10:

Primary productivity and microorganisms



Upon completion of this unit students should be able to:

  • Identify common microorganisms that serve as primary producers in the hyporheic zone.

  • Distinguish between fungi, bacteria and protozoa.

  • Identify respiration patterns and nutrient needs for each group.

  • Discuss community structure among the various microorganism groups.


Reading Assignments:

1) Jones and Mulholland:  pp. 287-303.


2) Murphy, M.L., Primary Production, in, River Ecology and Management Lessons from the Pacific Coastal Ecoregion, ed. by R.J. Naiman and R.E. Bilby, Springer Verlag, pp. 144-168.




3) Chappelle, F.H., 1993, Groundwater Microbiology and Geochemistry: Wiley, NY, pp. 32-50.


Chappelle, 1993




Tim's summary of Jones and Mulholland, pp. 287-303:


Primary productivity


Katy O:


The author discusses limiting factors for primary production. Based on the, text, how do you suppose these factors change throughout the day? How do they change seasonally? How do changes in these factors affect organisms?  


Summary of Murphy




What might the number of bacteria, eucaryotes, archaea, or virus counts in a water sample tell us about potential contamination concentrations in a groundwater sample?

Given the evolutionary sequence of the aforementioned organism series, what might one infer about early primordial groundwater chemistry within hyporheic zones?


Summary of Chapelle, 1993