ENVS-438,538 Lecture 6 - Announcements Exams are graded and...

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Announcements Exams are graded and posted. Range = 92 – 52.5. Mean = 78.2 Grades were curved by +4, so new range = 96 – 56.5. Mean 82.2
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Species Richness Patterns (Continued)
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Wet tropical lowlands hold approximately 7% of the Earth’s land area, but may hold 90% of species richness (extrapolated estimate). We will explore more on area effects in the next lecture... Species Richness Patterns
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Species Diversity Decreases With Elevation The underlyingcauses maybe similar to the latitudinalgradient. Not identical however – For example, effects on daylength and sun energy are not the same when increasingelevation versus latitude. Important Consideration:Pattern maybe due in part to decreased area with elevation!
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Mountains near Quito, Ecuador-­‐ There is more land area at lower elevations
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It is not clear whether elevation effects are truly a uniformlinear gradient. In some cases, diversity may be higher at middle elevations … ?
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Mid-­‐Domain Effect (MDE): A Null Model in Ecology -­‐ Species tend to have limited elevationalranges -­‐ Ranges are bounded bysea level and the top of the mountain -­‐ We might expect more overlap of elevational ranges in the middle for random reasons
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Mid-­‐Domain Effect (MDE): A Null Model in Ecology -­‐ Mid-­‐Domain Effect seems to be the trend in plants, insects, small mammals. -­‐ Vigorous discussion/debate as to the validityofmodel and causes. Bias towards plants and temperate zones in manystudies done so far. Why?
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Study: Geometrid moths along the Barva Transect in Costa Rica.
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Study: Geometrid moths along the Barva Transect in Costa Rica.
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Study: Geometrid moths along the Barva Transect in Costa Rica.
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