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. Population ecology is a major subfield of ecology—one that deals with the dynamics of species populations and how these populations interact with the environment. ... Human population increase from 10,000 BC – 2000 AD. Population growth is change in population over time, and can be quantified as the change in the number of individuals in a population per unit time. ... This article or section includes a list of works cited or a list of external links, but its sources remain unclear because it lacks in-text citations. ... Drawing of the structure of cork as it appeared under the microscope to Robert Hooke from Micrographia which is the origin of the word cell. Cells in culture, stained for keratin (red) and DNA (green). ... Growth factor is a protein that acts as a signaling molecule between cells (like cytokines and hormones) that attaches to specific receptors on the surface of a target cell and promotes differentiation and maturation of these cells. ... A nutrient is either a chemical element or compound used in an organisms metabolism or physiology. ... The term cell growth is used in two different ways in biology. ...

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. Intraspecific competition is the interaction between members of the same species that vie for the same resource in an ecosystem (e. ...

Density dependent fecundity also exists, where the birth rate falls as competition increases. Fecundity is the potential reproductive capacity of an organism or population, measured by the number of gametes (e. ...

There also exists density-independent inhibition, where other factors such as weather and disturbances may affect a populations carrying capacity. Weather is a term that encompasses phenomena in the atmosphere of a planet. ... Carrying capacity usually refers to the biological carrying capacity of a population level that can be supported for an organism, given the quantity of food, habitat, water and other life infrastructure present. ...