447 resultados para tern


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UANL

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Breeding seabirds are threatened by human activities that affect nesting and foraging habitat. In Canada, one of the seabirds most at risk of extirpation is the Roseate Tern, Sterna dougallii. Although critical nesting habitat has been identified for the Roseate Tern in Canada, its foraging locations and the diet of its chicks are unknown. Therefore, our goal was to determine the foraging locations and diet of chicks of Roseate Tern breeding on Country Island, Nova Scotia, which is one of Canada's two main breeding colonies. In 2003 and 2004, we radio-tracked the Roseate Tern by plane to locate foraging areas and conducted feeding watches to determine the diet of chicks. Roseate Tern foraged approximately 7 km from the breeding colony over shallow water < 5 m deep. In both years, sand lance, Ammodytes spp., was the most common prey item delivered to chicks, followed by hake, Urophycis spp. Our results are consistent with previous work at colonies in the northeastern United States, suggesting that throughout its range, this species may be restricted in both habitat use and prey selection. The reliance on a specific habitat type and narrow range of prey species makes the Roseate Tern generally susceptible to habitat perturbations and reductions in the availability of prey.

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Seychelles supports around three million nesting pairs of sooty terns. However, there have been recent declines and the colonies continue to face ongoing threats from habitat change and excessive commercial harvesting of their eggs, as well as potential threats by commercial fishing and climate change. A possible method to counter these threats is to re-establish breeding colonies on islands from which they have disappeared. An attempt was made to attract birds to a previously occupied island through habitat management, decoy birds and playback of recorded sooty tern calls. Habitat preparation involved predator eradication and tree removal to provide open ground with bare sandy areas and low herb vegetation. Overflying birds were attracted by broadcast calls, with some circling over and landing among the decoys. Large three-dimensional plastic models were superior to other models presented. This study demonstrated that large numbers of birds can be attracted by these means and that the birds then undertook behaviour associated with breeding, including egg laying by a few birds. However, after five seasons a breeding colony has not yet been established; one possible cause is the emergence of unexpected egg predators, common moorhen Gallinula chloropus and common myna Acridotheres tristis.

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http://digitalcommons.colby.edu/atlasofmaine2006/1003/thumbnail.jpg

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http://digitalcommons.colby.edu/atlasofmaine2006/1013/thumbnail.jpg

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The BRICS TERN – BRICS Trade and Economics Research Network is a group of independent research institutes established four years ago by five think tanks from Brazil, Russia, India, China and South Africa. The main objective of the network is to study different aspects of trade and economic relations amongst these five countries. The purpose of the V BRICS TERN Meeting was to analyze and debate the effects of the negotiations of the Mega Agreements, mainly those initiated by the US and the EU, already in negotiation, to each of the BRICS Trade Policies. Both Mega Agreements were examined – the Trans Pacific Partnership (TPP) and the Transatlantic Trade and Investment Partnership (TTIP). The studies included the main impacts on trade flows and on the international trade rules system, respecting the perspective of each of the countries concerned. This workshop was an initiative of the Center for Global Trade and Investments (CGTI), a think-tank on International Trade held by FGV Sao Paulo School of Economics. Its main objective is the research on trade regulation, preferential trade agreements, trade and currency, trade and global value chains, through legal analysis and economic modelling. One of its main researches, now, is on the potential economic and legal impacts of the Mega Agreements on Brazil and WTO rules. This meeting was organized in March14, 2014, in Rio de Janeiro, in a perfect timing for introducing such issues in the international agenda, in advance of the 6th BRICS Summit scheduled to be held in Brazil in July 2014.

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Fil: Terán E., Gastón.

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Fil: Rougés, Alberto.

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Fil: Introna, Ana María.

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Este trabajo pretende reconstruir la genealogía de la autocrítica al interior de los sectores intelectuales de la izquierda argentina a partir del itinerario de Oscar Terán, uno de sus principales protagonistas e historiadores. Se revisa su principal obra historiográfica y sus intervenciones en revistas político culturales a fines de delimitar rupturas y continuidades en la construcción de un relato que da cuenta del proceso de radicalización política en Argentina. Así, veremos cómo dicho relato se desplaza desde una lectura contemplativa en los años 80 hacia una operación de clausura en los años 90 y principios del presente siglo

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Este trabajo pretende reconstruir la genealogía de la autocrítica al interior de los sectores intelectuales de la izquierda argentina a partir del itinerario de Oscar Terán, uno de sus principales protagonistas e historiadores. Se revisa su principal obra historiográfica y sus intervenciones en revistas político culturales a fines de delimitar rupturas y continuidades en la construcción de un relato que da cuenta del proceso de radicalización política en Argentina. Así, veremos cómo dicho relato se desplaza desde una lectura contemplativa en los años 80 hacia una operación de clausura en los años 90 y principios del presente siglo

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Este trabajo pretende reconstruir la genealogía de la autocrítica al interior de los sectores intelectuales de la izquierda argentina a partir del itinerario de Oscar Terán, uno de sus principales protagonistas e historiadores. Se revisa su principal obra historiográfica y sus intervenciones en revistas político culturales a fines de delimitar rupturas y continuidades en la construcción de un relato que da cuenta del proceso de radicalización política en Argentina. Así, veremos cómo dicho relato se desplaza desde una lectura contemplativa en los años 80 hacia una operación de clausura en los años 90 y principios del presente siglo