07 - 9/7/10 Lecture 7: Ecosystem Functions 1. Finish train...

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9/7/10 1 Lecture 7: Ecosystem Functions 1. Finish train wrecks 2. Ecological Hierarchies Definitions 3. Energy Flows - Food Webs 4. Biogeochemical Cycles Spotted Owl Shameful Legacy After 20 Years : The northern spotted owl’s listing as threatened under the federal Endangered Species Act on June 26, 1990 marked the beginning of the demise of the federal forest management program in western Oregon. Federal forest harvest was nearly shut-down to allegedly “protect” the owl’s old growth habitat. The owl’s Oregon legacy continues to haunt the forest sector, as federal forest management on national forests and BLM forests remains in legal and bureaucratic gridlock—additionally, catastrophic federal forest fire & health problems abound, and paltry timber sale volumes are uncertain from month-to-month. Ironically, although the harvest prohibitions were supposed to cure the spotted owl’s problems, its population numbers today remain under attack—not by logging—but rather attacked by forest fires and predation by another owl, the barred owl. In 1989, logging on federal lands accounted for about 4 billion bdft/year in Oregon, over half the state’s harvest. By 2000, it fell to less than 10% of its former importance. The
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07 - 9/7/10 Lecture 7: Ecosystem Functions 1. Finish train...

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