| Abstract: | Genetic implications of natural and artificial regeneration following three regeneration methods (group selection, shelterwood, and clearcut) were investigated in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii [Mirb.] Franco) using genetic markers (17 allozyme loci). In general, harvesting followed by either natural or artificial regeneration resulted in offspring populations little altered from those in the previous generation. Cutting the smallest trees to form shelterwoods, however, resulted in the removal of rare, presumably deleterious, alleles, such that slightly fewer alleles per locus were observed among residual trees (2.76) and natural regeneration (2.75) than found in uncut (control) stands (2.86). Thus, although the shelterwood regime appears quite compatible with gene conservation, it would be best to leave parent trees of a range of sizes in shelterwoods designated as gene conservation reserves, in order to maximize the number of alleles (regardless of current adaptive value) in naturally regenerated offspring. Seedling stocks used for artificial regeneration in clearcut, shelterwood, and group selection stands (7 total) had significantly greater levels of genetic diversity, on average, than found in natural regeneration. This is probably because the seeds used in artificial seedling stocks came from many wild stands and thus, sampled more diversity than found in single populations.Genetic implications of natural and artificial regeneration following three regeneration methods (group selection, shelterwood, and clearcut) were investigated in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii [Mirb.] Franco) using genetic markers (17 allozyme loci). In general, harvesting followed by either natural or artificial regeneration resulted in offspring populations little altered from those in the previous generation. Cutting the smallest trees to form shelterwoods, however, resulted in the removal of rare, presumably deleterious, alleles, such that slightly fewer alleles per locus were observed among residual trees (2.76) and natural regeneration (2.75) than found in uncut (control) stands (2.86). Thus, although the shelterwood regime appears quite compatible with gene conservation, it would be best to leave parent trees of a range of sizes in shelterwoods designated as gene conservation reserves, in order to maximize the number of alleles (regardless of current adaptive value) in naturally regenerated offspring. Seedling stocks used for artificial regeneration in clearcut, shelterwood, and group selection stands (7 total) had significantly greater levels of genetic diversity, on average, than found in natural regeneration. This is probably because the seeds used in artificial seedling stocks came from many wild stands and thus, sampled more diversity than found in single populations. |
| Genre: | Article |
| ProdID: | 70020795 |
| Citation Author: | Adams, W. T.; Zuo, J.; Shimizu, J. Y.; Tappeiner, J. C. |
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| Citation End Page: | 396 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Forest Science |
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| Citation Number Of Pages: | 7 |
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| Citation Publisher: | Soc of American Foresters |
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| Citation Search Results Text: | Impact of alternative regeneration methods on genetic diversity in coastal Douglas-fir; 1998; Article; Journal; Forest Science; Adams, W. T.; Zuo, J.; Shimizu, J. Y.; Tappeiner, J. C. |
| Citation Start Page: | 390 |
| Citation Volume: | 44 |
| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Impact of alternative regeneration methods on genetic diversity in coastal Douglas-fir; 1998; Article; Journal; Forest Science; Adams, W. T.; Zuo, J.; Shimizu, J. Y.; Tappeiner, J. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1998 00:00 -0600 |
| Publisher: | Soc of American Foresters |
