965 resultados para NORTH-AMERICAN SOCIETY


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Claims that there will be a massive loss of species as tropical forests are cleared are based on the relationship between habitat area and the number of species. Few studies calibrate extinction with habitat reduction. Critics raise doubts about this calibration, noting that there has been extensive clearing of the eastern North American forest, yet only 4 of its approximately 200 bird species have gone extinct. We analyze the distribution of bird species and the timing and extent of forest loss. The forest losses were not concurrent across the region. Based on the maximum extent of forest losses, our calculations predict fewer extinctions than the number observed. At most, there are 28 species of birds restricted to the region. Only these species would be at risk even if all the forests were cleared. Far from providing comfort to those who argue that the current rapid rate of tropical deforestation might cause fewer extinctions than often claimed, our results suggest that the losses may be worse. In contrast to eastern North America, small regions of tropical forest often hold hundreds of endemic bird species.

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Estudi sobre l'obra dramàtica de Francesc Renart, inventari i inicis del sainet costumista català del Vuit-cents.

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One letter explaining his decision to decline membership in the Anthology Society, critiquing Rees’s Cyclopaedia, and discussing the North American Review.

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The purpose of this study was to examine the birthplace and relative age effects in National Football League (NFL) players. The place and date of birth of NFL players in the United States were analyzed with Monte Carlo simulations to determine if either factor was predictive of the probability of reaching the elite level in this sport. Consistent with previous findings on professional North American athletes in baseball, ice hockey, basketball, and golf, players born in cities with populations of less than 500,000 were significantly over-represented in the NFL, whereas players born in cities with populations over 500,000 were significantly under-represented. Unlike many other sports, no relative age effects were found for the NFL. Small cities, in particular, appeared to possess characteristics that facilitate the development and/or emergence of athletic talent in American football. Possible psychosocial factors mediating the birthplace effect are discussed as are implications for the development of sporting expertise.

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A major issue in the ongoing Transatlantic Trade and Investment Partnership (TTIP) negotiations is investor-state dispute resolution as it relates to foreign investments. The United States would like to have strong investor protections similar to those of the North American Free Trade Agreement (NAFTA) included in the TTIP agreement. Civil society groups on both sides of the Atlantic object to binding arbitration of investment disputes, fearing that arbitration awards could endanger environmental and other types of regulations. This paper examines the experience with investor-state dispute resolution under NAFTA to determine whether judgments rendered in these cases have had adverse effects.

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Ash layers from Deep Sea Drilling Project site 178 in the northeast Pacific Ocean have been dated by the 40Ar-39Ar stepwise heating technique to resolve published discrepancies concerning the length of time explosive volcanism has affected the eastern Aleutian arc and Alaskan Peninsula. The results of the investigation indicate that the record of ash-fall deposition at site 178 extends back at least 6.5 m.y. Assuming that 6.5 m.y. ago marks the onset of renewed calc-alkalic volcanism of the volcanic arc, proposed models of continuous and discontinuous motion between the Pacific and North American lithospheric plates can be evaluated. If appreciable time elapsed between the onset of subduction and the onset of arc volcanism, the 6.5-m.y. record of ash-fall deposition in the north-east Pacific is most compatible with models of continuous plate motion throughout late Cenozoic time.

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Mode of access: Internet.

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"A waterfowl research project of the North American Wildlife Foundation."

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Binder's title.

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Sponsored by the Country Women's Council, U.S.A. and the Associated Country Women of the World societies in the United States.

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Imprint varies.

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A revision of the list of the North American Cicadellidae, published in 1937, by DeLong and Caldwell. cf. Introd.

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Mode of access: Internet.