نتایج جستجو برای: environmental change
تعداد نتایج: 923444 فیلتر نتایج به سال:
In Eastern Boundary Current systems, wind-driven upwelling drives nutrient-rich water to the ocean surface, making these regions among the most productive on Earth. Regulation of productivity by changing wind and/or nutrient conditions can dramatically impact ecosystem functioning, though the mechanisms are not well understood beyond broad-scale relationships. Here, we explore bottom-up control...
Aquaculture is the fastest growing food sector and continues to expand alongside terrestrial crop and livestock production. Using portfolio theory as a conceptual framework, we explore how current interconnections between the aquaculture, crop, livestock, and fisheries sectors act as an impediment to, or an opportunity for, enhanced resilience in the global food system given increased resource ...
When you hear the word microbes, what comes to your mind? Something much too small to see and that makes you fall ill? Just because some microbes cause diseases that does not mean they are all evil. For example, in the marine (ocean) environment, the vast majority of microbes are good ones. They are the “driving engines” of the ocean and are essential for the health of our whole planet. Unfortu...
It is widely agreed the Anthropocene has seen an unprecedented decline in the natural resources conditions that have underpinned the economic growth of the last few hundred years. As communities, we have not responded to Boulding’s vision of ‘the coming space ship earth’ although not for want of much official and private effort. As ‘wicked problems’ the impacts have been often ignored or off lo...
Moorlands are unique environments found in uplands of the temperate zone including in the UK, New Zealand and Ireland, and in some high altitude tropical zones such as the Andean páramos. Many have been managed through grazing, burning or drainage practices. However, there are a number of other environmental and social factors that are likely to drive changes in management practice over the nex...
The paper is concerned with the case whereby the distribution of a firm’s productivity shocks changes without the knowledge of the firm. Over time the firm learns about the nature and extent of the change in the distribution of the shock and adjusts, incurring adjustment costs in the process. The long run loss in profits (±) due to the shift in the distribution we term the equilibrium response....
Policy-makers and the public, it has famously been said [Brooks, 1986], are more interested in the possibility of non-linear dislocations and surprises in the behavior of the environment than in smooth extrapolations of current trends. How indeed should we design our models to generate environmental foresight, to detect, in particular, threats to our environment lying “just beyond the horizon”?...
IN THEIR REVIEW “ENVIRONMENTAL CHANGE and Antarctic seabird populations,” (Special Issue on Polar Science, 30 Aug., p. 1510), J. P. Croxall et al. describe paradoxes, many of which exist only because of a limited review of available information. Stating that the paleoecological record shows close correspondence between ice cover and the presence of Adélie penguins is correct (1), but claiming t...
Environmental conditions can change the activity of plant genes via epigenetic effects that alter the competence of genetic information to be expressed. This may provide a powerful strategy for plants to adapt to environmental change. However, as epigenetic changes do not modify DNA sequences and are therefore reversible, only those epi-mutations that are transmitted through the germline can be...
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