Lab 10 water quality and macroinvertebrate diversity fall 2014
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This document discusses aquatic macroinvertebrates and their use in assessing water quality. It will teach students to describe macroinvertebrates, understand watersheds, and explain bio-monitoring. Students will learn about collecting macroinvertebrates, and how their presence indicates water quality. The document compares two streams - Bath Creek with abundant plants and slow flow, and shaded Yellow Creek with rocky bottom and fast flow. Photosynthesis and cellular respiration affect oxygen levels differently in each stream.
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Lab 10 water quality and macroinvertebrate diversity fall 2014
- 1. Water Quality and Aquatic Macroinvertebrate Diversity #NSB2014 1
- 2. After successfully participating in this lab, you will be able to: • Thoroughly describe a macroinvertebrate. • Understand a watershed. • Explain why bio-monitoring is important. • Describe the fluctuations in dissolved oxygen in two different waterways. • Differentiate between photosynthesis and cellular respiration. #NSB2014 2
- 3. What is an Aquatic Macroinvertebrate? #NSB2014 3
- 4. What is an Aquatic Macroinvertebrate? • Insects, worms, snails, crayfish, other arthropods • Live in all types of water habitats • Most have gills for absorbing oxygen • Cannot escape pollution events • Certain species are more or less tolerant of pollution #NSB2014 4
- 5. Many aquatic macroinverts are larval stages of terrestrial adults #NSB2014 5
- 6. How do we collect aquatic macroinvertebrates? Kick-seining – stretching a large net across a stream and kicking up sediments, where macroinverts live. #NSB2014 6
- 7. Biomonitoring • Stream biomonitoring is the study of the biological organisms present in a stream. • Based on what organisms are present, you can get an idea of what the water quality is like. – Species dependent – depends on number of species of different sensitivities to pollution #NSB2014 7
- 8. What is a Watershed? • A watershed is the area of land where all of the water that is under it or drains off of it goes into the same place. #NSB2014 8
- 9. Cuyahoga Watershed •Land area draining into one water body •Cuyahoga Watershed drains into Lake Erie #NSB2014 9
- 10. Bath Nature Preserve #NSB2014 10
- 11. Bath Creek Lots of sunlight Abundant plant growth Warmer water Mud bottom Slow water flow #NSB2014 11
- 12. North Fork of Yellow Creek Shaded Cooler water Few aquatic plants Fast flowing water Rocky bottom #NSB2014 12
- 13. Did you know? • Photosynthesis – happens during the day, and only in plants • Cellular Respiration – happens all the time, in ALL living things (including green plants!) • In streams with lots of plants, the amount of oxygen increases during the day, but may drop very low at night. This means some organisms may not be able to survive in the water #NSB2014 13
- 14. Photosynthesis 6CO2 + 6H2O + sunlight → C6H12O6 + 6O2 Carbon dioxide + water + sun → organic matter + oxygen Cellular Respiration C6H12O6 + 6O2 → 6CO2 + 6H2O + energy Glucose + oxygen → carbon dioxide + water + energy #NSB2014 14
- 15. Which stream would have more dissolved oxygen? Bath Creek Yellow Creek #NSB2014 15
- 16. Which is Bath Creek? #NSB2014 16
Editor's Notes
- Start with video clip. What lives in streams and why does it matter?
- Lead into where these samples are coming from. What affect the water quality is the surrounding land use. Has it been impacted by humans, geology topography