Population ecology

measurement of population per unit area or unit volume

ensemble of individuals of a species in an area, or their number

measure of the number of deaths in a population from a given cause, scaled by population, in a set period of time

population control policy which was used by the People's Republic of China

total number of live births per 1,000 population divided by the length of a given period in years

increase in the number of individuals in a population

undesirable condition where human numbers exceed the current carrying capacity of the environment

geographical area in which a taxon can be found

maximum population size of the species that the environment can sustain indefinitely

legal rights and freedoms relating to reproduction and reproductive health

poorly-understood phenomenon causing decline in bee populations

mathematical function

first-order nonlinear differential equations, frequently used to describe the dynamics of biological systems in which two species interact, one as a predator and the other as prey

ecological theory concerning the selection of life history traits

period marked by a significant increase of birth rate

ecological concept

thumb|Metapopulations are important in fisheries. The local population (1.) serves as a source for hybridization with surrounding subspecies populations (1.a, 1.b, and 1.c).The populations are normally spatially separated and independent but spatial overlap between them during breeding times allows for gene flow between the populations. A metapopulation consists of a group of spatially separated populations of the same species which interact at some level. The term metapopulation was coined by Richard Levins in 1969 to describe a model of population dynamics of insect pests in agricultural fie

ecological concept

movement of individuals (animals, plants, fungi, bacteria, etc.) from their birth site to their breeding site, as well as the movement from one breeding site to another

disease affecting hibernating bats caused by a white fungus infecting the skin of the muzzle, ears, and wings

conceptual collapse in behavior which can result from overcrowding

thumb|Anti Shein protest, Grenoble, France Overconsumption describes a situation where consumers overuse their available goods and services to where they cannot, or do not want to, replenish or reuse them. In microeconomics, this is the point where the marginal cost of a consumer is greater than their marginal utility. The term overconsumption is quite controversial and does not necessarily have a single unifying definition. When used to refer to natural resources to the point where the environment is negatively affected, it is synonymous with the term overexploitation. However, when used in t

exponential growth based on a constant rate

thumb|right|Biston betularia caterpillars on birch (left) and willow (right), demonstrating a color polyphenism. A polyphenic trait is a trait for which multiple, discrete phenotypes can arise from a single genotype as a result of differing environmental conditions. It is therefore a special case of phenotypic plasticity.

ongoing mass extinction of amphibian species worldwide

ecological trend

British zoologist and ecologist (1900–1991)

analytical framework designed to study the diversity of life history strategies used by different organisms throughout the world, as well as the causes and results of the variation in their life cycles

ecological sampling method

Overpopulation or overabundance is a state in which the population of a species is larger than the carrying capacity of its environment. This may be caused by increased birth rates, lowered mortality rates, reduced predation or large scale migration, leading to an overabundant species and other animals in the ecosystem competing for food, space, and resources. The animals in an overpopulated area may then be forced to migrate to areas not typically inhabited, or die off without access to necessary resources.

1974 American memo on population control

average number of daughters per woman

The biocapacity or biological capacity of an ecosystem is an estimate of its production of certain biological materials such as natural resources, and its absorption and filtering of other materials such as carbon dioxide from the atmosphere.

government-imposed limit of two children per family

shows the proportion of individuals surviving to each age for a given species or group

PDE named after statistician and biologist Ronald Fisher

time required to double a quantity

estimated maximum capacity for energy production on Earth

condition of demographic balance where population remains constant over time

world population growth projections

population control policy in China

Concept in ecology

population dynamics model characterized by sharp booms and busts

equates human impact on the environment

model of multi-species population dynamics

anti-predator adaption

Ecoauthoritarianism (also known as an eco-dictatorship or authoritarian environmentalism) is a political ideology which attempts to reconcile both environmentalist and authoritarian tendencies. It is justified by the belief of the inevitability and necessity of a strong central government to preserve the environment.

age-structured model of population growth

group of residents outside an official census count

growth function exhibiting a singularity in a finite time