Life zones and crop zones of the United States

Merriam, C. Hart

doi:10.5962/bhl.title.35423

Cited by 117 publications

(60 citation statements)

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“…''Montane'' is here defined widely, in the terms of Merriam (1898), to include both the arid transition zone upward to the Hudsonian zone (or subalpine), with the upper limits at the Arctic-alpine zone. I set the lower limits of the montane zone at the Sonoran zone, thus excluding the main pinyon-juniper formation throughout the region, consisting of various combinations of Juniperus californica, J. osteosperma, Pinus edulis, and P. monophylla.…”

Section: Physical Attributes Of Samplesmentioning

confidence: 99%

Distribution Patterns of Great Basin Conifers: Implications of Extinction and Immigration

Charlet¹

2007

aliso

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Factors influencing the distribution of scattered montane conifers on mountaintops in the Great Basin of North America were investigated. The sources of data were collections and observations on more than 300 mountain ranges in the region. All mountains in the region with at least one montane conifer species and all adjacent source areas were included in the data set. In all, 164 montane island sites and 40 mainland sites were used in the analyses. Physical data for each site were compiled and regression analyses were conducted to test the predictions of three island biogeography models: immigration, extinction, and equilibrium. These models were treated as alternatives to the Random Placement Hypothesis. The Random Placement Hypothesis was refuted. However, none of the island biogeography models explained the observed patterns because mainland species-area slopes were within the expected range of island slopes. The pattern that emerges is one in which both the ''mainlands'' and islands represent the remnants of a preexisting regional conifer flora. The vertical relief of a site's montane zone is a better estimate of habitat diversity than area, and explains 65% of all variation in species richness on mountain ranges in the region. Although not all predictions of the island biogeography models were supported, it appears that both immigration and extinction of montane and subalpine conifers have occurred in the region during the Late Quaternary. Extinction was more important than immigration in shaping modern conifer distributions because area, not distance to sources, has a stronger influence on species richness.

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Section: Physical Attributes Of Samplesmentioning

confidence: 99%

Distribution Patterns of Great Basin Conifers: Implications of Extinction and Immigration

Charlet¹

2007

aliso

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“…We used the widely accepted Holdridge life zone classification over other existing classification systems (Merriam 1889, Rivas-Martinez 1981 as it is perhaps the most widely used abiotically based system in North America. Future work can explore the predictability of other classifications systems.…”

Section: Analysesmentioning

confidence: 99%

Plant Geography Upon the Basis of Functional Traits: An Example from Eastern North American Trees

Swenson¹,

Weiser²

2010

Ecology

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“…Beginning as early as the Life Zone classifications of Merriam (1898), site classifications use physiographic or environmental characteristics along with vegetation. Ecological land classification approaches integrate climate, physiography, landform, soil, and vegetation to define ecosystem or ecological land units, typically within a spatially nested hierarchy (e.g.…”

Section: Ecological Site Classificationmentioning

confidence: 99%

Plant Species Coalition Groups of Zion National Park: An Individualistic, Floristic Alternative to Vegetation Classification

Ott

Sanderson

McArthur

2015

Monographs of the Western North American Naturalist

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Life zones and crop zones of the United States

Cited by 117 publications

References 0 publications

Distribution Patterns of Great Basin Conifers: Implications of Extinction and Immigration

Distribution Patterns of Great Basin Conifers: Implications of Extinction and Immigration

Plant Geography Upon the Basis of Functional Traits: An Example from Eastern North American Trees

Plant Species Coalition Groups of Zion National Park: An Individualistic, Floristic Alternative to Vegetation Classification

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