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Study.Guide+Lecture+4 - BIS2B Fall 2008 Study Guide Lecture...

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BIS2B, Fall 2008 Study Guide Lecture 4 Oct 1, 2008 Read through this guide quickly in preparation for lecture 4, if you have time. This guide is meant as reinforcement and reference for material that I will present tomorrow. At the end, you will find study questions about the material. These study questions are of the sort you will see on the exam and should guide your studying. Reading both basic and supplemental. Reading: 52.2 and web links described below. As we discussed in Lecture 3 Monday evening, one learns a good slice of global biological diversity in knowing about the great terrestrial biomes of the world. Your text has a great account of these in section 52.3 that will serve you well. The biomes are characterized by the form or “physiognomy” of the plants that live in them. Thus, to use the definition in the text, a biomes is the growth from of the dominate plant. The growth forms are distinctive and are caused by temperature, moisture, seasonality --- and to a smaller degree to tertiary factors referred to below --- of the part of the globe where they exist. Like many large complex, biological phenomena, biomes have indistinct boundaries that grade gradually into one another. Although the form and morphology of the plants in the biomes is similar in different regions of the world, their evolutionary histories vary. Different phylogenies for different regions. Read about this briefly in “Phylogenetic Taxonomy” on page 1131 where the evolution of horses is discussed. We will return to this point later in the course, and simply take note of it now. This is point Cib2 in the study guide for lectures 2 & 3. Now do the little assignment to which I referred at the end of Monday night’s lecture (I have modified it slightly). Make a diagram that lines up the biomes in our text based upon the annual total precipitation. You should plot all of the biomes in our text along one scale of precipitation. Thus, the precipitation scale runs from 0 (zero) to 262 cm of precipitation. Use two symbols, a solid circle, for biomes dominated by trees. These are the biomes with “forest” in their names: boreal forest, temperate deciduous forest, thorn forest, tropical deciduous forest, and tropical rain forest. Use an open circle, O for the rest of the biomes. Think about what the graph might mean. Can you infer cause and effect for it? What causes what, as implied by this graph. We will interpret the graph in class on Wednesday. 1
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The line of cause and effect for biomes is as follows. 1. Input of energy from the sun decreases latitudinally from the equator to the poles which determines, 2. Climate and weather (moisture, and temperature and their seasonality): 2i The primary latitudinal patterns of decreasing temperature and rainfall from the equator to the poles are modified by the secondary factors : 2ia. Seasons, the annual cycle of energy from the sun caused by the angle of the earth axis in the orbit about the sun. 2ib. The earth’s spin about its axis and Coriolis force on fluids in the atmosphere
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Study.Guide+Lecture+4 - BIS2B Fall 2008 Study Guide Lecture...

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