1. Compare the dissolved oxygen, pH and temperature readings for these sample sites…
McKittrick Canyon, Guadalupe Mtns. National Park, TX
Guadalupe River, TX
San Jacinto River, TX
Lake Conroe, TX
Which areas have the highest D.O. readings? The lowest? Give reasons.
How does the D.O. affect the biotic potential of the streams? Explain.
What factors affect pH? How do they affect it?
For real time data on how the drought is affecting these areas, visit