Editing Hybrid (biology) (section)

===Genetic mixing and extinction===
{{Main|Genetic pollution}}
{{further|Genetic mixing|Introgression}}

Regionally developed [[ecotype]]s can be threatened with [[extinction]] when new alleles or genes are introduced that alter that ecotype. This is sometimes called genetic mixing.<ref>{{cite journal |last1=Mooney |first1=H. A. |last2=Cleland |first2=E. E. |date=2001 |title=The evolutionary impact of invasive species |journal=PNAS |volume=98 |issue=10 |pages=5446–5451 |doi=10.1073/pnas.091093398 |pmid=11344292 |pmc=33232|bibcode=2001PNAS...98.5446M |doi-access=free}}</ref> Hybridization and introgression, which can happen in natural and hybrid populations, of new genetic material can lead to the replacement of local [[genotypes]] if the hybrids are more [[Fitness (biology)|fit]] and have breeding advantages over the indigenous ecotype or species. These hybridization events can result from the introduction of non-native genotypes by humans or through habitat modification, bringing previously isolated species into contact. Genetic mixing can be especially detrimental for rare species in isolated habitats, ultimately affecting the population to such a degree that none of the originally genetically distinct population remains.<ref>{{cite journal |last1=Rhymer |first1=J. M. |last2=Simberloff |first2=D. |date=1996 |title=Extinction by Hybridization and Introgression |journal=Annual Review of Ecology and Systematics |volume=27 |issue=1 |pages=83–109 |doi=10.1146/annurev.ecolsys.27.1.83|bibcode=1996AnRES..27...83R }}</ref><ref>{{cite book |last1=Potts |first1=Brad M. |last2=Barbour |first2=Robert C. |last3=Hingston |first3=Andrew B. |date=2001 |url= http://www.rirdc.gov.au/reports/AFT/01-114.pdf |title=Genetic Pollution from Farm Forestry using eucalypt species and hybrids:A report for RIRDC/L&WA/FWPRDC Joint Venture Agroforestry Program |archive-url= https://web.archive.org/web/20040102175403/http://www.rirdc.gov.au/reports/AFT/01-114.pdf |archive-date=2 January 2004 |publisher=Rural Industrial Research and Development Corporation, Australian Government |id=RIRDC Publication No. 01/114; RIRDC Project No CPF - 3A |isbn=9780642583369 |issn=1440-6845}}</ref>