363 lecture 9-2008 - Current extinctions 2

363 lecture 9-2008 - Current extinctions 2 - Reading...

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Reading assignment For 2/18: Chapter 11: Small populations For 2/20: Chapter 12: Applied population biology
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Breakdown of an Ant-Plant Mutualism Follows the Loss of Large Herbivores from an African Savanna Mutualisms are key components of biodiversity and ecosystem function, yet the forces maintaining them are poorly understood. We investigated the effects of removing large mammals on an ant- Acacia mutualism in an African savanna. Ten years of large- herbivore exclusion reduced the nectar and housing provided by plants to ants, increasing antagonistic behavior by a mutualistic ant associate and shifting competitive dominance within the plant-ant community from this nectar-dependent mutualist to an antagonistic species that does not depend on plant rewards. Trees occupied by this antagonist suffered increased attack by stem-boring beetles, grew more slowly, and experienced doubled mortality relative to trees occupied by the mutualistic ant. These results show that large mammals maintain cooperation within a widespread symbiosis and suggest complex cascading effects of megafaunal extinction. Science 11 January 2008: Vol. 319. no. 5860, pp. 192 - 195
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Ecuador hunts for 'massacre' bodies The Ecuadorean authorities have carried out a search for victims  of a reported massacre of an indigenous Amazonian tribe by  loggers as part of a battle over land.    Local media and indigenous leaders said the loggers shot dead 15  members of the Taromenane tribe, which cut ties with the rest  of Ecuador in the 1950s to protect their customs. Enrique Eguime, an indigenous leader, had said the massacre took place in eastern Orellana when members of the Taromenane and Tagaeri peoples tried to stop a team of loggers from cutting down trees. The Taromenane and Tagaeri move around the 700,000-hectare Yasuni reserve the government has set aside as a protected area.
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It's All Ova U.N. lifts year-old ban on Caspian Sea beluga caviar exports The world's got a fever, and the only prescription is more caviar. In a two-part move, the U.N. has lifted a year-old ban on the delicacy, allowing Caspian Sea countries to profit despite concern about declining sturgeon populations. Last week, the U.N. Convention on International Trade in Endangered Species announced an agreement on the waaay
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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 9-2008 - Current extinctions 2 - Reading...

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