906 resultados para Bermuda Archipel


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"Extrait du Bulletin de la Société de géographie de Lisbonne, no 1 et 2 - 8e sér."

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Description based on: Vol. 34, no. 1 (spring 1977); title from cover.

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Plates printed on both sides.

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Mode of access: Internet.

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Thesis (doctoral)--Universitat Upsala.

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Mode of access: Internet.

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Includes bibliographies.

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Mode of access: Internet.

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The concept of the United Kingdom acting as a bridge between Europe and the United States has been a key element in British foreign policy for six decades. Under the second Blair Premiership it reached both its apogee and its nadir. This paper analyses these developments focusing both on the transatlantic and European ends. Particular attention is paid to the failure of the Blair government either to establish a secure place for Britain as a co-leader or to make the British people more comfortable in their European skins. This failure occurred at a period when the EU is characterised by leadership transition and confusion. New leaderships will emerge in the EU over the next two years but it seems unlikely that Britain, characterised by a continuing disconnect between a Euro-sceptic public discourse and deep involvement at a governmental level will develop a European policy narrative that is regarded as convincing at either the EU or domestic level. This weakness is compounded by a failure to develop new thinking about the rise of new powers such as China and India.

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Women are a high-risk population for cardiovascular diseases (CVD); however relationships between CVD and subpopulations of mothers are sparse. A secondary data analysis of the 2006 Health Survey of Adults and Children in Bermuda was conducted to compare the prevalence of CVD risk factors in single (n=77) and partnered (n=241) mothers. A higher percentage of single mothers were Black (p25 kg/m2 (p=0.01) and reported high blood pressure (p=0.004) and high cholesterol (0.017). Single mothers were nearly three times (OR=2.66) more likely to experience high blood pressure and two times (OR= 2.22) more likely to have high cholesterol. Single mothers may benefit from nutrition education programs related to lowering CVD risk.

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Photographs from the February 1997 Bermuda meeting. Courtesy of Gert-Jan van Ommen.

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Despite the potential impact of ocean acidification on ecosystems such as coral reefs, surprisingly, there is very limited field data on the relationships between calcification and seawater carbonate chemistry. In this study, contemporaneous in situ datasets of seawater carbonate chemistry and calcification rates from the high-latitude coral reef of Bermuda over annual timescales provide a framework for investigating the present and future potential impact of rising carbon dioxide (CO2) levels and ocean acidification on coral reef ecosystems in their natural environment. A strong correlation was found between the in situ rates of calcification for the major framework building coral species Diploria labyrinthiformis and the seasonal variability of [CO32-] and aragonite saturation state omega aragonite, rather than other environmental factors such as light and temperature. These field observations provide sufficient data to hypothesize that there is a seasonal "Carbonate Chemistry Coral Reef Ecosystem Feedback" (CREF hypothesis) between the primary components of the reef ecosystem (i.e., scleractinian hard corals and macroalgae) and seawater carbonate chemistry. In early summer, strong net autotrophy from benthic components of the reef system enhance [CO32-] and omega aragonite conditions, and rates of coral calcification due to the photosynthetic uptake of CO2. In late summer, rates of coral calcification are suppressed by release of CO2 from reef metabolism during a period of strong net heterotrophy. It is likely that this seasonal CREF mechanism is present in other tropical reefs although attenuated compared to high-latitude reefs such as Bermuda. Due to lower annual mean surface seawater [CO32-] and omega aragonite in Bermuda compared to tropical regions, we anticipate that Bermuda corals will experience seasonal periods of zero net calcification within the next decade at [CO32-] and omega aragonite thresholds of ~184 micro moles kg-1 and 2.65. However, net autotrophy of the reef during winter and spring (as part of the CREF hypothesis) may delay the onset of zero NEC or decalcification going forward by enhancing [CO32-] and omega aragonite. The Bermuda coral reef is one of the first responders to the negative impacts of ocean acidification, and we estimate that calcification rates for D. labyrinthiformis have declined by >50% compared to pre-industrial times.