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A free price system or free price mechanism (informally called the price system or the price mechanism) is a mechanism of resource allocation that relies upon prices set by the interchange of supply and demand. The resulting price signals communicated between producers and consumers determine the production and distribution of resources ...
In biology and ecology, a resource is a substance or object in the environment required by an organism for normal growth, maintenance, and reproduction. Resources can be consumed by one organism and, as a result, become unavailable to another organism. [1] [2] [3] For plants key resources are light, nutrients, water, and space to
This view is seen in the Y model of the cost of reproduction, where resources may be allocated to either reproduction or soma. Evidence for this can be seen in G. firmus , where short-winged females have as much as a 400% increase in ovarian growth and a 30% to 40% reduction in somatic triglyceride reserves (used for movement) compared to long ...
Tilman is best known for his work on the role of resource competition in community structure and on the role of biodiversity in ecosystem functioning. [2] One of his most cited articles is the 1994 Nature article on the Biodiversity and stability in grasslands which provided data regarding an experiment that began in 1982 with more than 200 plots in a grassland field in the Cedar Creek ...
where N j is the density of species j, R is the density of the resource, a is the rate at which species j eats the resource, d is species js death rate, and r is the rate at which resources grow when not consumed. It is easy to show that when species j is at equilibrium by itself (i.e., dN j /dt = 0), that the equilibrium resource density, R* j, is
Consumer–resource interactions are the core motif of ecological food chains or food webs, [1] and are an umbrella term for a variety of more specialized types of biological species interactions including prey-predator (see predation), host-parasite (see parasitism), plant-herbivore and victim-exploiter systems. These kinds of interactions ...
Sexual selection is an evolutionary concept that has been used to explain why, in some species, male and female individuals behave differently in selecting mates. In 1930, Ronald Fisher wrote The Genetical Theory of Natural Selection, [3] in which he introduced the modern concept of parental investment, introduced the sexy son hypothesis, and introduced Fisher's principle.
Conservation genetics is an interdisciplinary subfield of population genetics that aims to understand the dynamics of genes in a population for the purpose of natural resource management, conservation of genetic diversity, and the prevention of species extinction.