Fossil and genetic history of a pinyon pine (Pinus edulis) isolate

J. L. Betancourt, W. S. Schuster, J. B. Mitton, Scott R Anderson

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

The most isolated northern stand of Colorado pinyon pine at Owl Canyon, Colorado, has a broad and flat size class distribution common to population expansions, with the largest and oldest trees near the center of the grove. Analyses of fossil packrat Neotoma middens within the grove indicate that the stand originated by long-distance dispersal rather than by vicariance. The 5000-yr pollen and macrofossil record suggests that pinyon pine colonized the site sometime between 1290-420 yr BP, the latter age corresponding to the oldest tree in the stand. Electrophoretic data show that this colonization was not attended by typical founder effects predicted by theory or observed for other known founder events. The Owl Canyon stand has not suffered significant losses in genetic variation relative to likely source populations. Large initial population size, multiple founding events, rapid population growth, or selection favoring heterozygous genotypes could all explain the high heterozygosity and only slightly reduced polymorphism and number of alleles per locus. -from Authors

Original languageEnglish (US)
Pages (from-to)1685-1697
Number of pages13
JournalEcology
Volume72
Issue number5
StatePublished - 1991
Externally publishedYes

Fingerprint

Pinus edulis
groves
canyons
Strigiformes
canyon
heterozygosity
fossils
fossil
Neotoma
midden
founder effect
vicariance
history
genetic variation
population size
population growth
allele
polymorphism
genotype
pollen

ASJC Scopus subject areas

  • Ecology

Cite this

Betancourt, J. L., Schuster, W. S., Mitton, J. B., & Anderson, S. R. (1991). Fossil and genetic history of a pinyon pine (Pinus edulis) isolate. Ecology, 72(5), 1685-1697.

Fossil and genetic history of a pinyon pine (Pinus edulis) isolate. / Betancourt, J. L.; Schuster, W. S.; Mitton, J. B.; Anderson, Scott R.

In: Ecology, Vol. 72, No. 5, 1991, p. 1685-1697.

Research output: Contribution to journalArticle

Betancourt, JL, Schuster, WS, Mitton, JB & Anderson, SR 1991, 'Fossil and genetic history of a pinyon pine (Pinus edulis) isolate', Ecology, vol. 72, no. 5, pp. 1685-1697.
Betancourt JL, Schuster WS, Mitton JB, Anderson SR. Fossil and genetic history of a pinyon pine (Pinus edulis) isolate. Ecology. 1991;72(5):1685-1697.
Betancourt, J. L. ; Schuster, W. S. ; Mitton, J. B. ; Anderson, Scott R. / Fossil and genetic history of a pinyon pine (Pinus edulis) isolate. In: Ecology. 1991 ; Vol. 72, No. 5. pp. 1685-1697.
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