BIS002B MT1 Study Guide W10 Key Schwartz

BIS002B MT1 Study Guide W10 Key Schwartz - Answers to Study...

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Answers to Study Guide questions for first BIS 2B midterm. January 18, 2010 1. Biological species; morphological species. Definitions are in the book. 2. Species richness is the number of species in a given area. Species evenness is the degree to which those species are evenly distributed in terms of abundance. Species diversity is a combination of richness and evenness to give an overall metric of diversity. A common measure of diversity is the Shannon-Weiner Index (H’). This is the negative of the sum, across each species, of the proportion of each species multiplied by its log proportion: H = - (p i ln(p i )) 3. Plot A B C D E Species richness 7 6 3 5 5 Evenness mod low hi** mod low (mod = moderate) Diversity: 1.82** 1.01 1.1 1.5 1.37 4. Rainforests: near the equator. Rising air driven by incident solar radiation causes the evaporation to be lost through precipitation nearest the equator, where the Inter-tropical Convergent zone is located. Deserts: near 30 deg S and N latitudes. As the Hadley cells of rising air over the equator displace air to the north and to the south, the cooler and drier air begins to sink and gain heat (increase in density). Warm air has a greater capacity to hold water than cooler air, thus it rarely rains in the vicinity of this falling dry air mass. 5. A. Because of the tilt of the earth, maximum solar radiation swings N and S of the equator with the seasons, so in July the ITCZ should be located primarily just N or the equator. 6. Wet air masses are pushed up as they move from west to east over the Sierra Nevada by prevailing westerly winds. These wet air masses drop their moisture as they rise and cool. On the east side of the mountain air warms as it sinks and increases in density. This air is relatively dry, so it rarely rains on the eastern side of these mountains, leaving a rain shadow. This term refers to a dry area on the downwind sides of mountain ranges. Thus, the same elevation on the E and W side of the Sierras is much drier on the E. 7. Autotrophs use extertnal energy to fix carbon and manufacture sugars. The most common type is photoautrophs which use energy from the sun and manufacture sugars (C x H x ) through photosynthesis. These organisms then absorb other nutrients (N, P,K, micronutrients) through either roots or through their leaves, in the case of marine algae. By contrast, heterotrophs gain energy and nutrients by consuming other organisms. 8.
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This note was uploaded on 10/22/2010 for the course BIS 2B taught by Professor Strong during the Winter '08 term at UC Davis.

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BIS002B MT1 Study Guide W10 Key Schwartz - Answers to Study...

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