منابع مشابه
Are Ecosystems Dynamical Systems?
The paradigm of dynamical systems as frame of description has been extremely successful for a variety of controlled systems. The ingredients of such an approach are an (assumed or known) fixed number of degrees of freedom, a phase space, state variables, and a (usually differential) equation of motion governing the temporal evolution of the system, or its movement in phase space along certain t...
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Poor urban neighborhoods have been labeled “food deserts” with few grocery stores and mainly fast food restaurants. Alternatively, according to popular media and a few academic studies, the arrival of upscale eateries and “boutique” shopping venues is one of the most visible signs of a shift in a neighborhood’s income or demographics. Certainly some formerly low-income neighborhoods that have b...
متن کاملFood Deserts
Cardiovascular disease (CVD), including heart disease and stroke, is the leading cause of death in the United States, producing an immense health and economic burden. An estimated 92.1 million US adults are diagnosed with at least one type of CVD, and a projected 43.9% of US adults will have some form of CVD by 2030. One of the primary reasons for the continued high burden of CVD is the persist...
متن کاملTuring Patterns in Deserts
Self-organised patterns of vegetation are a characteristic feature of many semi-arid regions. In particular, banded vegetation is typical on hillsides. Mathematical modelling is widely used to study these banded patterns, because there are no laboratory replicates. I will describe the development of spatial patterns in an established model for banded vegetation via a Turing bifurcation. I will ...
متن کاملMicrobial ecosystems are dominated by specialist taxa.
Abundance and specificity are two key characteristics of species distribution and biodiversity. Theories of species assembly aim to reproduce the empirical joint patterns of specificity and abundance, with the goal to explain patterns of biodiversity across habitats. The specialist-generalist paradigm predicts that specialists should have a local advantage over generalists and thus be more abun...
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ژورنال
عنوان ژورنال: Nature
سال: 1978
ISSN: 0028-0836,1476-4687
DOI: 10.1038/275691a0