Extinction and extripation Flashcards
Population
group of organisms that share similar genes and can exchange genes within the group- physically able and accessible (barriers)
Meta population
all geographically and reproductively isolated populations of a species which would be able to interbreed
Stratified population
a single population that can interbreed but is staring to differ in gene frequency in different parts of overall range
Demography
need genetic diversity in a population- diversity
genetic bottleneck
sudden decline in population, genetic pool limited
gene flow
movement of alleles between two previously isolated populations (immigration), must be able to interbreed still
Density dependence
only enough resources to support a population
Carrying capacity
the number of individuals an environment can support before resources run out or the environment begins to degrade
Extinction
death of the last individual of a species, can be hard to prove= perform successive searches for individuals
Lazarus taxa
species thought to be extinct that are rediscovered
Extinct in the wild
extinct in habitat but still found in captivity, often last stage before full extinction
Minimum viable population
lowest number of individuals a population must sustain before it faces extinction, if falls below genetic diversity may be too low for healthy breeding and greater likelyhood of being wiped out during “chance events” (disasters etc.)
Functionally extinct
species still has members present in environment, have decreased below minimum viable population and have obvious factors in environment that prevents recovery- no longer performing their role in environment
Extirpation
extinction of one or more subpopulations in a part of the native range of the species- loss of genetic diversity
de-extinction
maybe with genetic cloning, not there yet (CRISPR/ Cas9)
