Human Population: The Next Half Century
- J. Cohen
- 14 November 2003
By 2050, the human population will probably be larger by 2 to 4 billion people, more slowly growing (declining in the more developed regions), more urban, especially in less developed regions, and…
Community Food Webs: Data and Theory
Food webs hold a central place in ecology. They describe which organisms feed on which others in natural habitats. This book describes recently discovered empirical regularities in real food webs: it…
Consumer-resource body-size relationships in natural food webs.
Using a unique global database on consumer and resource body sizes, it is shown that the mean body-size ratios of aquatic herbivorous and detritivorous consumers are several orders of magnitude larger than those of carnivorous predators.
Interaction strengths in food webs: issues and opportunities
The various ways in which the term ‘interaction strength’ has been applied are described and the implications of loose terminology and definition for the development of this field are discussed.
Ecological community description using the food web, species abundance, and body size
- J. Cohen, T. Jonsson, S. Carpenter
- Environmental ScienceProceedings of the National Academy of Sciences…
- 23 January 2003
Knowing the food web gives new insight into the disputed form of the allometric relationship between body mass and abundance, as well as the pattern of energy flow in the community.
Nonnegative ranks, decompositions, and factorizations of nonnegative matrices
Body sizes of animal predators and animal prey in food webs
Body size offers a good (though not perfect) interpretation of the ordering of animal species assumed in the cascade model, a stochastic model of food web structure, when the body sizes of different animal species are taken as log-normally distributed.
Food web patterns and their consequences
Although webs were often initially reported in despair at ever understanding ecological complexity, recently discovered widespread patterns in the shapes of webs, and theoretical explanations for these patterns, indicate that webs are orderly and intelligible, and have some foreseeable consequences for the dynamics of communities.
A stochastic theory of community food webs I. Models and aggregated data
Three recently discovered quantitative empirical generalizations describe major features of the structure of community food webs. These generalizations are: (i) a species scaling law: the mean…
How Many People Can the Earth Support
This article offers an overview of global human population economy environment and culture in order to explain why some people are interested in the question "How many people can the Earth support?"…