In population ecology, density-dependent processes occur when population growth rates are regulated by the density of a population.- Density dependence
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Interaction in population ecology, whereby members of the same species compete for limited resources.
As a result, the growth rate of a population slows as intraspecific competition becomes more intense, making it a negatively density dependent process.
Part of the cell cycle in which replicated chromosomes are separated into two new nuclei.
This can occur when cells become overcrowded (density-dependent inhibition) or when they differentiate to carry out specific functions for the organism, as is the case for human heart muscle cells and neurons.
Branch of zoology that concerns the "methodological study and consequent knowledge of birds with all that relates to them."
He concluded that population was regulated primarily by density-dependent controls, and also suggested that natural selection produces life-history traits that maximize the fitness of individuals.
On Aggression (Das sogenannte Böse.
He maintains that aggression is a technique used to gain control over necessary resources, and serves as a "density-dependent factor" in population control.
Area without being introduced by humans.
Initially when a portion of a wild population is hunted, an increased availability of resources (food, etc.) is experienced increasing growth and reproduction as density dependent inhibition is lowered.
Breed of domestic sheep descended from a population of feral sheep on the 100 ha island of Soay in the St Kilda Archipelago, about 65 km from the Western Isles of Scotland.
The sheep exhibit a phenomenon known as overcompensatory density dependence, in which their population never reaches equilibrium.
Process of segregating organisms from a group according to desired or undesired characteristics.
Diseases are density dependent factors and decreases in the density of the deer populations through culling causes diseases, such as chronic wasting disease and Lyme disease, to spread less quickly and effectively.
The Quaternary period (from 2.588 ± 0.005 million years ago to the present) has seen the extinctions of numerous predominantly megafaunal species, which have resulted in a collapse in faunal density and diversity and the extinction of key ecological strata across the globe.
This led to a region wide extinction vortex, resulting in cyclically diminishing bio-productivity and defaunation.
American evolutionary biologist and ecologist, and an International Chair Professor at Centre for Biodiversity Dynamics at the Norwegian University of Science and Technology (NTNU).
He is a specialist of stochastic population dynamics, on which he co-authored a book with Steinar Engen and Bernt-Erik Sæther, and of methods for estimating density dependence from time series of population density.
Species of tree in the family Simaroubaceae, found in the rainforests and savannahs of South and Central America and the Caribbean.
Density-dependent inhibition occurs between seedlings: they are more likely to survive in areas where fewer seedlings of S. amara are growing.