Extinction in Biological Definition

Biodiversity

... has coincided with the expansion of concern over extinction observed in the last decades of the 20th ... with one species after another suffering extinction . Estimates of global species diversity vary ... See also : biogeography , Amazonian forest , extinction , Unified neutral theory of biodiversity . ...

Evolution

... and macroevolution 1.5 Speciation and extinction 2 Evolutionary biology 3 History of ... can be said to have occurred. Speciation and extinction Speciation is the creation of two or more ... of the theory of punctuated equilibrium . extinction is the disappearance of species (i.e. gene ...

Extinction

... In biology and ecology , extinction is the ceasing of existence of a species or group of species. The moment of extinction is generally considered to be the death of the last individual of that species. extinction is a natural phenomenon; it is estimated that ...

Human

... 8.1 Psyche 8.2 Self-reflection 9 Human extinction 10 See also 11 References 12 ... more than one of zoology . Human extinction Human extinction refers to the possibility that the human species ...

Metapopulation

... habitat which has been left open by the extinction of another population. They may also immigrate into another small population and so rescue it from extinction (called the rescue effect ). The development ... each occupied patch can become unoccupied with an extinction probability e . Additionally, 1- N of the ...

Natural selection

... be more varied and therefore more resistant to extinction due to environmental catastrophes and extinction events . This has been proposed as one reason for ... how species change, and can account for both the extinction of one species and the creation of a new one. ...

Competitive exclusion principle

... will always have an ever so slight advantage over the other that leads to extinction of the second competitor in the long run. The competitive exclusion ... trade-offs , and lag prevent exclusion (ignoring stochastic extinction over longer time-frames). However, such systems tend to be analytically ...

Adaptive radiation

... An example of adaptive radiation as the result of an environmental change is the rapid spread and development of mammalian species after the extinction of the dinosaurs. Archipelagoes . Isolated ecosystems , such as islands and mountain areas, can be colonized by a new species which upon ...

Botany

... changes Plants can also help us understand changes in on our environment in many ways. Understanding habitat destruction and species extinction is dependent on an accurate and complete catalogue of plants provided systematics and taxonomy . Plant responses to ultraviolet radiation can ...

Cold-blooded

... times the number of poikilothermic animals as homeothermic animals. However, in a given niche, homeotherms often drive poikilothermic competitors to extinction because homeotherms can gather food for a greater fraction of each day. Poikilotherms succeed in some niches, such as islands, or distinct ...

Eugenics

... since many human societies sought to protect the underprivileged and weak, those societies were at odds with the natural selection responsible for extinction of the weakest. Only by changing these social policies, Galton reasoned, could society be saved from a "reversion towards mediocrity"—a phrase ...

Francis Galton

... examining forearm and height measurements, Galton introduced the concept of correlation in 1888 . His statistical study of the probability of extinction of surnames led to the concept of Galton-Watson stochastic processes . Fingerprint The method of identifying criminals by their fingerprints ...

Gene

... that have reproduced successfully in the past. Often, many individual organisms share a gene; thus, the death of an individual need not mean the extinction of the gene. Indeed, if the sacrifice of one individual enhances the survivability of other individuals with the same gene, the death of an ...

Gene pool

... selection . Meanwhile, low genetic diversity (see inbreeding and population bottlenecks ) can cause reduced fitness and an increased chance of extinction . When many alleles exist for a given gene or locus , a population is said to be polymorphic with respect to that gene or locus. When no ...