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Hybridization Leads to Loss of Genetic Integrity in Shortleaf Pine: Unexpected Consequences of Pine Management and Fire SuppressionAuthor(s): Charles G. Tauer; John F. Stewart; Rodney E. Will; Curtis J. Lilly; James M. Guldin; C. Dana Nelson
Source: Journal of Forestry 110(4):216-224
Publication Series: Scientific Journal (JRNL)
Station: Southern Research Station
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DescriptionHybridization between shortleaf pine and loblolly pine is causing loss of genetic integrity (the tendency of a population to maintain its genotypes over generations) in shortleaf pine, a species already exhibiting dramatic declines due to land-use changes. Recent findings indicate hybridization has increased in shortleaf pine stands from 3% during the 1950s to 45% for present-day natural regeneration. This drastic increase in hybridization is likely because of increased and wide-spread planting of loblolly pine and reduced selection pressure against loblolly pine and hybrids caused by fire suppression. Because shortleaf pine is more fire and drought tolerant than loblolly pine, loss of genetic integrity of shortleaf pine may reduce the resiliency and adaptability of southeastern conifer forests in the face of climate change and other stressors. Loblolly pine may also be at risk, with hybrids increasing in natural stands of loblolly pine from 4% in the 1950s to 27% at present.
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CitationTauer, Charles G.; Stewart, John F.; Will, Rodney E.; Lilly, Curtis J.; Guldin, James M.; Nelson, C. Dana 2012. Hybridization leads to loss of genetic integrity in shortleaf pine: unexpected consequences of pine management and fire suppression. Journal of Forestry 110(4):216-224.
Keywordsshortleaf pine, loblolly pine, hybrids, introgression
- Frequent fire protects shortleaf pine (Pinus echinata) from introgression by loblolly pine (P. taeda).
- Post-fire resprouting of shortleaf pine is facilitated by a morphological trait but fire eliminates shortleaf x loblolly pine hybrid seedlings
- Occurrence of shortleaf x loblolly pine hybrids in shortleaf pine orchards: Implications for ecosystem restoration
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