Extinction and extripation Flashcards Preview

ENVR 202 pt. 2 > Extinction and extripation > Flashcards

Flashcards in Extinction and extripation Deck (15):
1

Population

group of organisms that share similar genes and can exchange genes within the group- physically able and accessible (barriers)

2

Meta population

all geographically and reproductively isolated populations of a species which would be able to interbreed

3

Stratified population

a single population that can interbreed but is staring to differ in gene frequency in different parts of overall range

4

Demography

need genetic diversity in a population- diversity

5

genetic bottleneck

sudden decline in population, genetic pool limited

6

gene flow

movement of alleles between two previously isolated populations (immigration), must be able to interbreed still

7

Density dependence

only enough resources to support a population

8

Carrying capacity

the number of individuals an environment can support before resources run out or the environment begins to degrade

9

Extinction

death of the last individual of a species, can be hard to prove= perform successive searches for individuals

10

Lazarus taxa

species thought to be extinct that are rediscovered

11

Extinct in the wild

extinct in habitat but still found in captivity, often last stage before full extinction

12

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.)

13

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

14

Extirpation

extinction of one or more subpopulations in a part of the native range of the species- loss of genetic diversity

15

de-extinction

maybe with genetic cloning, not there yet (CRISPR/ Cas9)