Results 121 to 130 of about 149 (147)
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Population density effects on longevity
Genetica, 1993Population density, or the number of adults in an environment relative to the limiting resources, may have important long and short term consequences for the longevity of organisms. In this paper we summarize the way in which crowding may have an immediate impact on longevity, either through the phenomenon known as dietary restriction or through ...
Laurence D. Mueller, Joseph L. Graves
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The variability of population densities
Nature, 1988The variability of population densities over time (henceforth called population variability) is one of several meanings of ecological stability1. Here we show that estimates of the variability of population densities increase as we increase the number of years included in their calculation.
Stuart L. Pimm, Andrew Redfearn
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On Population-Weighted Density
SSRN Electronic Journal, 2018Population-weighted density is the mean of the densities of subareas of a larger area weighted by the populations of those subareas. It is an alternative to the conventional density measure, total population divided by total area. This paper shows that population-weighted density is equal to conventional density plus the variance in density across the ...
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The many faces of population density
Oecologia, 2005Population density, one of the most fundamental demographic attributes, may vary systematically with spatial scale, but this scale-sensitivity is incompletely understood. We used a novel approach-based on fully censused and mapped distributions of eastern grey squirrel (Sciurus carolinensis) dreys, beaver (Castor canadensis) lodges, and moose (Alces ...
Stephen J. Mayor +2 more
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Population Density and Group Size
American Journal of Sociology, 1972This study looks at the relationship between the size of the small interacting group (in numbers of persons) and its environment in this case, the density of its immediate population. We hypothesized that persons in more densely populated areas will gather for social interaction in smaller groups, in fewer bisexual groups.
S. Thomas Friedman, James Tucker
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1970
Publisher Summary This chapter describes the concept of population density and the process of measuring it in a city. Whenever zoning is undertaken, there must be a determination as to how much land should be assigned to residential purposes and this demands an estimate of the probable population growth in the next decade or more; but this is not the ...
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Publisher Summary This chapter describes the concept of population density and the process of measuring it in a city. Whenever zoning is undertaken, there must be a determination as to how much land should be assigned to residential purposes and this demands an estimate of the probable population growth in the next decade or more; but this is not the ...
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Density-dependent populations [PDF]
Nature, 1992 Mountford, M. D., Rothery, P.
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Density-vague population change
Trends in Ecology & Evolution, 1986Explicit density-dependence differs from density-vagueness in the sort of regulation imposed on populations. Explicit density-dependence implies regulation toward a central equilibrium point, whereas density-vagueness implies population change away from the two extremes of extinction and immense densities.
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Population Density and Mental Illness
The Journal of Social Psychology, 1994(1994). Population Density and Mental Illness. The Journal of Social Psychology: Vol. 134, No. 4, pp. 545-546.
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Survival variability and population density in fish populations
Nature, 2008To understand the processes that regulate the abundance and persistence of wild populations is a fundamental goal of ecology and a prerequisite for the management of living resources. Variable abundance data, however, make the demonstration of regulation processes challenging.
Cóilín Minto +2 more
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