Concepts of Biology (BIOL116) - Dr. S.G. Saupe; Biology Department, College of St. Benedict/St. John's University, Collegeville, MN 56321; ssaupe@csbsju.edu; http://www.employees.csbsju.edu/ssaupe/ |
Biogeochemical Cycles - Study
Guide
Reading:
Purves et al. Chapter 56
Goal and Objectives: The major goal of this unit is to provide you with an understanding of the source, nature and mechanism of the movement of energy and nutrients in an ecosystem. Specifically, upon completion of this unit you should be able to:
describe the basic model for nutrient cycles
outline the nutrient cycles of water, carbon, nitrogen, phosphorus
explain the
Gaia hypothesis
Important Terms/Concepts: (be able to use conversationally)
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Questions for Thought and Study:
Trace the passage of a water molecule through the hydrological cycle
Trace the passage of a carbon atom through the complete carbon cycle
Trace the passage of a nitrogen atom through the complete nitrogen cycle
Explain why nutrient cycles are termed "biogeochemical".
Explain why legumes often grow in nutrient poor soil.
Explain why legumes are sometimes called the "meat of the poor".
For each biogeochemical cycle, indicate the importance of microorganisms
Which nutrient cycle relies most heavily on microbes for its successful completion?
For each nutrient cycle: (1) identify some uses for the element; (2)identify the major abiotic reservoir; (3) identify the major biotic reservoir; (4) identify the way and form in which the nutrient enters the biotic reservoir; and (5) identify the way and form in which the nutrient leaves the abiotic reservoir
What is the Gaia hypothesis?
Describe the experiment performed at Hubbard Brook. What did we learn from these studies?
The
data in the table below are extracted from work at Hubbard Brook.
What conclusions can you
draw from these data?
Data from Studies of
Hubbard Brook, NH |
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Nutrient |
Undisturbed |
Cut |
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Input |
Output |
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Calcium |
2.6 |
11.6 |
77.9 |
Nitrate |
3.7 |
2.0 |
114.0 |
Compare
and contrast hydrologic, atmospheric and sedimentary cycles.
Identify elements characteristic of each.
Which is fastest? slowest? Why?
What
is the Greenhouse Effect? Why
is it occurring? What will be
the effects of global warming? What
is the role of carbon dioxide, CFC's, methane
and nitrous oxide in the Greenhouse effect?
What is the source of these materials?
Trace the pathway that a (1) water molecule or (2) carbon atom in a sugar or (3) nitrogen atom in a protein, that is in my body (your brilliant instructor) would take to get into your body. Assume that you aren't a cannibal.
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Last updated: April 22, 2004 � Copyright by SG Saupe