Altitudinal ecotypes in Hawaiian Metrosideros

Reports were scanned in black and white at a resolution of 600 dots per inch and were converted to text using Adobe Paper Capture Plug-in.Hawaiian Metrosideros distribution extends from tropical to cool-temperature climates throughout the six major islands of the Hawaiian Island chain. It forms a highly polymorphic complex that occurs in a continuous distribution over areas with average annual rainfalls ranging from 30 to 450 inches and at elevations from sea-level to 8500 feet, and in diverse pedological and topographical habitats. All of these plants are probably derived from one or a very small number of ancestral introductions that arrived within the last 20 million years by long distance dispersal. Seeds collected from diverse altitudinal sites on the islands of Hawaii and Maui and grown under uniform greenhouse conditions show evidence of ecotypic differentiation along altitudinal gradients. The seedlings, although from islands separated by 50 miles of ocean, show a parallelism in their altitudinal intra-population variation that strongly overlaps from site to site.Support for research on this paper was made possible by NSF GB 23230

Experimental studies on the nature of species

"Literature cited": v.1, p. 437-442; v.2, p. 154-163; v.3, p. 124-125; v.5, p. 198-204; v.6, p. 113-115.I. Effect of varied environments on western North American plants.--II. Plant evolution through amphiploidy and autoploidy, with examples from the Madiinae.--III. Environmental responses of climatic races of Achillea.--IV. Genetic structure of ecological races.--V. Biosystematics, genetics, and physiological ecology of the erythranthe section of mimulus.--VI. Interspecific hybrid derivatives between facultatively apomictic species of bluegrasses and their responses to contrasting environments.Mode of access: Internet