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Geographic Variation in Slash Pine

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Mature cones and foliage were collected from each of 5 slash pine (Pinus elliottii Engelm.) trees in 54 stands scattered throughout the species range, and 1-year-old progeny seedlings were grown. Twelve morphological traits were studied in cones, seeds, and foliage from the parents, and 13 morphological and physiological traits were studied in the seedlings. Most traits showed appreciable stand-to-stand variation. The patterns of stand variation differed among traits, but most were characterized by gradual changes between one or more "highs" or "lows." Many of the patterns contained a latitudinal gradient through Florida with a trend reversal in the "north-central" area (extreme south Georgia and north Florida). These patterns were believed to have resulted from adaptation to climatic or other environmental factors which change gradually through the species range. Some traits showed weakly defined or highly fluctuating gradients, suggesting some degree or randomness or discontinuity. A few showed distinctly clinal trends in the south and random variation in the north and a few showed strictly random variation. The two recognized varieties differed appreciably in several traits, but the results as a whole suggested that they are not discrete genetic entities, the patterns of variation usually being characterized by continuity.
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Document Type: Journal Article

Affiliations: Principal Plant Geneticist stationed at the Naval Stores and Timber Production Laboratory, Olustee, Florida, a field office of the Southeastern Forest Experiment Station, Forest Service, U. S. Department of Agriculture

Publication date: 1966-03-01

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    Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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