Bio171-F10-Lec 36 - Biology 171 Friday December 10, 2010...

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Biology 171 Friday December 10, 2010 Lecture 36: Biogeography Announcements Exam 4: Monday, Dec. 20, 7-9 PM. Covers lectures 28 (viruses) – 37 & discussions 9-11 (phylogeny reconstruction, Ant-fungal coevolution, Selection on human populations Exam review: Sunday, Dec 19, 5-6PM, MLB Aud 3 Course Evaluations Available on CTools! Conservation Biology (concluded) Prairie, Oceanic Islands, Freshwater & Tropical Rainforests Poster Species - 100 Heartbeat Club Biogeography Text Reading Lecture 36 : 4th: Chapter 50 (1013-1017) 3rd: Chapter 50 (1144-1146) Ch. 55 (1250-1252) Lecture 37 : No text reading. 1
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The distribution of major terrestrial biomes. Which have been most heavily impacted (in terms of area) by humans? 17
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The Prairie Ecosystem The North American prairie is one of the most endangered ecosystems on earth. The grasslands of North America began to form about 20 million years ago, but in some areas, up to 99 percent of the prairie has been destroyed in just the last 125-150 years. 18
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Greater Prairie Chicken Populations Have Plummeted (10s of millions to 690K) With Habitat Loss to Agriculture Although the ranges and population sizes of many prairie species have been severely degraded, relatively few have been driven to extinction (yet). 19
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Note the large number of red dots representing oceanic islands - the most vulnerable terrestrial ecosystems Biodiversity Hot Spots Are of Most Concern to Conservation Biologists A relatively small area with an exceptional concentration of endemic* species and a large number of endangered and threatened species (see also Fig. 55.4 ). *Species that originated in that area and are found nowhere else 20
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: products of volcanic or tectonic uplift, they have never had a terrestrial connection to continental land masses. Vulnerability : Endemic species radiations on oceanic islands have evolved in biotically sheltered conditions (very few predators/competitors/parasites). They are very vulnerable to
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Bio171-F10-Lec 36 - Biology 171 Friday December 10, 2010...

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