Pending Duplicate Bibliography Entries

Postglacial biogeography of Sierra lodgepole pine (Pinus contorta var. murrayana) in California

Plant macrofossils and pollen from 13 sites are used to reconstruct the biogeography of Sierra lodgepole pine (Pinus contorta Dougl. ex. Loud. var. murrayana) and its relationship to climate change, within the Sierra Nevada. During Late-Wisconsin deglaciation, lodgepole pine grew at least 500 m lower in elevation than today. Lodgepole pine was widely established within its modern elevational range between 10,500 and 9000 years B.P. During the early Holocene, lodgepole pine remained an integral member of montane forest assemblages below its present elevational range. Macrofossil evidence suggests successive disappearance from most lower elevation sites between 9000 and 6750 years B.P. A likely explanation suggests progressive climatic warming and drying of soils during the dry early Holocene, causing local extermination at the lower elevation sites. Within its present elevational range, a lack of macrofossils and a decline in diploxylon pollen suggests possible absence of lodgepole pine near several sites during the middle Holocene, with the tree continuing a retreat to higher, cooler elevations during this time. A return to lower elevation sites after ca 1700 years BP probably resulted from cumulative cooling during the Neoglacial.The postglacial migration pattern for Sierra lodgepole pine differs somewhat from that of the more widely distributed Rocky Mountain subspecies (P. contorta var. latifolia). While the pattern for the Rocky Mountain lodgepole was both latitudinal and elevational (only now reaching its northernmost extent in Canada [Cwynar \& McDonald, 1987]), Sierra lodgepole's migration was largely elevational with little migrational lag. Additional paleo-sites south of the present distribution of ssp. murrayana will help to clarity any latitudinal movements during the late Wisconsin.

Controls on surface water chemistry in the upper Merced River basin, Yosemite National Park, California

 

Physiographic contrasts, east and west

Citation states, 'The Yosemite, Death Valley, and Rocky Mountain areas are included in this comparison of eastern and western America.'

A study of the life history and food habits of mule deer in California

Citation stated, 'A scientific study of mule deer in Yosemite, Sequoia, and Lassen national parks, and other places.'

Additions to the lichen-flora of southern California

Citation stated, 'A list of new species, some discovered in the Yosemite region, with notes on habitats.'

Additions to the lichen-flora of southern California

Citation stated, 'A list of new species, some discovered in the Yosemite region, with notes on habitats.'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Telling Yosemite's story

Citation states, 'Series of ten articles on the geology of Yosemite. (Paging erratic)'

Fire management in the Yosemite mixed-conifer ecosystem

Fire has always played a role in the ecosystems of Yosemite National Park. Management of the Park under a policy of protecting the forests from fire has lad to unnaturally high flammable conditions. The present fire management program at Yosemite recognizes the dynamic role of fire. Naturally occurring fires are allowed to run their course in 63 percent of the Park and prescribed fire is used to return the remaining portion to its original condition. Burning prescriptions have been derived to meet management objectives.