نتایج جستجو برای: population ecology theory
تعداد نتایج: 1491992 فیلتر نتایج به سال:
© The Ecological Society of America www.frontiersinecology.org I this paper, we present a conceptual framework for investigating ecological patterns and processes at regional to continental scales. Ecological phenomena operate across a range of scales (Figure 1), but the development of ecological theory of regions to continents lags behind that of finer scales. Better understanding of broad sca...
Jr. (eds.). Prentice Hall, Englewood Cliffs, New Jersey. -, AND G. K. MEFFE. 1989. Poeciliid biology: where we are and where we should be going, p. 351-358. In: Ecology and evolution of livebearing fishes (Poeciliidae). G. K. MefFe and F. F. Snelson Jr. (eds.). Prentice Hall, Englewood Cliffs, New Jersey. STEARNS, S. C, AND R. E. CRANDALL. 1984. Plasticity for age and size at sexual maturity, a...
Observations of the evolution of species groups in nature, such as well recognized Galapagos finches, have motivated much theoretical research aimed at understanding the processes associated with such radiations. The Penna model is one such model and has been widely used to study aging. In this paper we use the basic Penna model to investigate the process of sympatric speciation in a simple foo...
The Madison Swanson Marine Protected Area was established to protect gag grouper, Mycteroperca microlepis, spawning aggregations on high relief, deepwater habitat in the Gulf of Mexico. Fishery biologists observed a decline in the proportion of male individuals in the population. The decline led fishery managers to question the reproductive health of the gag grouper population. However, competi...
Steven A. Frank Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697–2525 USA The theory of natural selection has two forms. Deductive theory describes how populations change over time. One starts with an initial population and some rules for change. From those assumptions, one calculates the future state of the population. Deductive theory predicts how pop...
Question: Population ecology and population genetics are treated separately in most textbooks. However, Darwin’s term the ‘struggle for existence’ included both natural selection and ecological competition. Using the simplest possible mathematical models, this paper searches for historical reasons for the lack of unity in ecological and evolutionary thought. Assumptions and methods: Logistic de...
This article addresses the sustainability of festival populations from the perspective of organizational ecology theory, and in particular age and density dependence. Data from whole populations of festivals in three Norwegian counties are examined. Analyses of festival start-ups demonstrate that the number of events in each county had risen faster than population growth before plateauing, and ...
Several authors have hypothesized that ecological systems are subject to thermodynamic optimization, which, if proven correct, could represent a long sought general principle of organization in ecology. Although there have been recent advances, this still remains as an unresolved topic, and ecologists lack a general method to test thermodynamic optimization hypotheses in specific systems. Here ...
Population demography is central to fundamental ecology and for predicting range shifts, decline of threatened species, and spread of invasive organisms. There is a mismatch between most demographic work, carried out on few populations and at local scales, and the need to predict dynamics at landscape and regional scales. Inspired by concepts from landscape ecology and Markowitz's portfolio the...
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