Density dependent inhibition

In population ecology, density-dependent inhibition describes a situation in which population growth is curtailed by crowding. In cell biology, it describes the reduction in cell division. When a cell population reaches a certain density, the amount of required growth factors and nutrients available to each cell becomes insufficient to allow continued cell growth.

This is also true for other organisms because an increased density means an increase in intraspecific competition. Greater competition means an individual has a decreased contribution to the next generation i.e. offspring. Density dependent mortality can be overcompensating, undercompensating or exactly compensating.

Density dependent fecundity also exists, where the birth rate falls as competition increases.

There also exists density-independent inhibition, where other factors such as weather and disturbances may affect a populations carrying capacity.
Population ecology is a major sub-field of ecology that deals with the dynamics of species populations and how these populations interact with the environment.[1]

The older term, autecology (from Greek: αὐτο, auto
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Population growth is the change in population over time, and can be quantified as the change in the number of individuals in a population per unit time. The term population growth
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Cell biology (also called cellular biology or formerly cytology, from the Greek kytos, "container") is an academic discipline that studies cells. This includes their physiological properties, their structure, the organelles they contain, interactions with
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population is the collection of people or organisms of a particular species living in a given geographic area or mortality, and migration, though the field encompasses many dimensions of population change including the family (marriage and divorce), public health, work and the
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The term growth factor refers to a naturally occurring protein capable of stimulating cellular proliferation and cellular differentiation. Growth factors are important for regulating a variety of cellular processes.
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macronutrients and those needed in relatively small quantities are called micronutrients.

See healthy diet for information on the role of nutrients in human nutrition.

Types of human nutrients

Macronutrients are defined in several different ways.
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The term cell growth is used in two different ways in biology.

When used in the context of reproduction of living cells the phrase "cell growth" is shorthand for the idea of "growth in cell populations by means of cell reproduction.
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Intraspecific competition is a particular form of competition in which members of the same species vie for the same resource in an ecosystem (e.g. food, light, nutrients, space). This can be contrasted with Interspecific competition, in which different species compete.
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Fecundity, derived from the word , generally refers to the ability to reproduce. In biology and demography, fecundity is the potential reproductive capacity of an organism or population, measured by the number of gametes (eggs), seed set or asexual propagules.
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weather is the set of all extant phenomena in a given atmosphere at a given time. The term usually refers to the activity of these phenomena over short periods (hours or days), as opposed to the term climate, which refers to the average atmospheric conditions over longer periods of
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In ecology, a disturbance is a temporary change in average environmental conditions that causes a pronounced change in an ecosystem.
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The equilibrium maximum of the population of an organism is known as the ecosystem's carrying capacity for that organism. Generally it is the supportable population of an organism, given the food, habitat, water and other necessities available within an ecosystem.
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