363 lecture 14-2008 - genetics 3

363 lecture 14-2008 - genetics 3 - Life fast, die young The...

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Life fast, die young The Aeta, a Philippine pygmy group Life expectancy at birth of 16.5 years Young women stop growing at 12-13 Reproductive fitness peaks at 15, at an average height of 140 cm (4’ 7”) Still not clear why life expectancy is so low Science 319:13; PNAS 104:20216
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South Africa to Resume Elephant Culling End of 13-Year Ban Follows Large Growth in Herds; Opponents Threaten Tourism Boycotts JOHANNESBURG, Feb. 25 -- South Africa will lift a 13-year-old ban on using professional hunters to reduce burgeoning elephant populations, officials announced Monday, despite opposition from animal rights activists who call such killings barbaric and unnecessary. Officials set no date for a resumption of culling, but activists immediately threatened tourism boycotts or court action to fight the move. Before the moratorium, sharpshooters borne by helicopters routinely killed hundreds of elephants at a time as a way to manage destructive herds. Big game hunting had severely depleted southern Africa's elephant population by the early 1900s. But in the past century, their numbers have recovered as safaris have grown more popular and game reserves have been created. Across the region there are an estimated 270,000 elephants, more than 120,000 of them in neighboring Botswana. Conservation officials in several African countries have struggled for years to strike a balance between the beloved animals, which have helped fuel a lucrative tourism boom, and other forms of wildlife whose habitats they devastate. In addition, elephants roaming beyond game parks sometimes trample villagers' crops. Since the ban went into effect in 1995, the number of elephants in South Africa has grown from about 9,000 to more than 20,000.
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Amphibian extinctions 211 times the background extinction rate More than 100 species may have already gone extinct and thousands more are threatened with extinction. Many of the threatened species cannot be safeguarded in the wild and require ex situ management if they are to persist.
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http://www.nature.com/news/2007/070205/pdf/445577a.pdf
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Beaver seen in NYC; first in centuries NEW YORK- Beavers grace New York City's official seal. But the industrious rodents haven't been spotted here for as many as 200 years—until this week. Biologists videotaped a beaver swimming up the Bronx River on Wednesday. Its twig- and-mud lodge had been spotted earlier on the river bank, but the tape confirmed the presence of the animal. "It had to happen because beaver populations are expanding, and their habitats are shrinking," said Dietland Muller-Schwarze, a beaver expert at the State University of New York College of Environmental Science and Forestry in Syracuse. "We're probably going to see more of them." Beavers gnawed out a prominent place in the city's early days as a European settlement, attracting fur traders to a nascent Manhattan. The animal appears in the city seal to symbolize a Dutch trading company that factored in the city's colonial
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This note was uploaded on 10/22/2008 for the course BSCI 363 taught by Professor Staff during the Spring '08 term at Maryland.

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363 lecture 14-2008 - genetics 3 - Life fast, die young The...

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