Isp 217l Essay

8588 Words Jul 7th, 2011 35 Pages
Water and the Environment Laboratory ISP 217L Spring 2011 Laboratory Manual*

Table of Contents
Exercise Lab 1. How much does temperature vary in large and small aquatic environments? Lab 2. What determines the water clarity of lakes, rivers and oceans? Lab 3. Where does the phosphorus go? Lab 4. How does human activity in watersheds affect the quality of lakes and rivers? Lab 5. Are the Great Lakes being influenced by the global greenhouse effect? Lab 6. How is the flow of the Red Cedar River influenced by the weather? Lab 7. What is the relationship between flow and turbidity in the Red Cedar River? Page 2 4 6 8 12 15 18

* Note that the Excel Manual is a separate booklet.

Revised 12/10 JDW

ISP217L Laboratory Manual Spring
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Would you expect aquatic or terrestrial organisms to be better adapted to cope with large temperature fluctuations? Defend your answer using an example.
ISP217L Laboratory Manual Spring 2011 Page 3

Lab 2 What determines the water clarity of lakes, rivers and oceans?
Introduction The clarity of the water is perhaps the most distinctive and readily recognized characteristic of a body of water. Why are some lakes and rivers clearer than others? To answer this question, you will conduct experiments in the laboratory to determine the effects of varying concentrations of different types of substances on the attenuation of light in a column of water. By measuring carefully, we can construct precise quantitative relationships between substance concentration and light attenuation. Objectives After completing this lab, you should be able to calculate and create a dilution series, calculate the depth of a column of water given its diameter and volume, and plot relationships between concentration (the independent variable- x-axis) and light attenuation (the dependent variable- yaxis) using Excel. Most importantly, you should gain a better understanding of the determinants of water clarity in aquatic habitats. Tools For week 1, your tools consist of a photometer for measuring light attenuation (consisting of a tube with a transparent bottom, a light meter, a wooden base, and a high-intensity light source), a ruler,

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