Results 211 to 220 of about 9,816 (255)

Notes on the Altitudinal Range of Forest Fungi

Mycologia, 1918
In most of the higher mountains in Washington, Oregon, Idaho, and Montana arctic conditions prevail during a part of the year. This is indicated by the occurrence of such heather-like plants as Phyllodoce empetriformis (Smith) Don, Ledum glandulosum Nutt., Vaccinium microphyllunm Ryd., Rhododendron albiflorum Hook., Gaultheria humnifusa (Graham) Ryd ...
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Altitudinal ranges of Phanerophytes and Chamaephytes in central Chile

Vegetatio, 1982
Considerable changes in the vegetation can be observed in the altitudinal and latitudinal gradients in central Chile, from 400 to 3400 m above sea level and from arid to subhumid regions (31°–34° S). The composition of the vegetation, the relative proportions of life forms, and seasonal activities of the species, help to define bioclimatic areas where ...
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Measurement of Relative Thyroid Activity in Free-ranging Rodents along an Altitudinal Transect

Nature, 1968
DETERMINATION of the relative rates of physiological activity in free-ranging animals in different environments is important to the understanding of the interaction between an organism and its environment, as well as in comparative studies of energy flow in ecosystems.
C A, Tryon, W R, Kodric, H N, Cunningham
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Climate determines upper, but not lower, altitudinal range limits of Pacific Northwest conifers

Ecology, 2011
Does climate determine species' ranges? Rapid rates of anthropogenic warming make this classic ecological question especially relevant. We ask whether climate controls range limits by quantifying relationships between climatic variables (precipitation, temperature) and tree growth across the altitudinal ranges of six Pacific Northwestern conifers on Mt.
A K, Ettinger, K R, Ford, J, HilleRisLambers   +2 more
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Variation in circulating corticosterone levels is associated with altitudinal range expansion in a passerine bird

Oecologia, 2011
Organisms frequently need to adjust physiological mechanisms to successfully breed in novel habitats. To explore how some populations physiologically acclimate to novel environmental conditions while others do not, we examine three subspecies of the white-crowned sparrow, Zonotrichia leucophrys. Of these subspecies, Z. l.
Elizabeth A, Addis, Jason E, Davis, Brooks E, Miner, John C, Wingfield   +3 more
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The adaptive significance of a wide altitudinal range for montane species

Transactions of the Botanical Society of Edinburgh, 1971
Summary Species of plants on two mountains in East Africa have wide altitudinal ranges. For example 75% of the afroalpine species on Kilimanjaro have ranges in excess of 650 m. It is suggested that wide range is an adaptation of montane species to long-term climatic fluctuations.
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The dynamics of leaf extension in plants with diverse altitudinal ranges

Oecologia, 1986
Rates of leaf extension have been studied with electronic auxanometers at mid-altitude in the Austrian Alps, where both low and high altitude species co-occur. The results demonstrate a clear differentiation in the temperature responses of extension between these two groups of species.
F I, Woodward, Ch, Körner, R C, Crabtree   +2 more
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The Elevational Gradient in Altitudinal Range: An Extension of Rapoport's Latitudinal Rule to Altitude

The American Naturalist, 1992
For trees, mammals, birds, reptiles, insects, and amphibians, the species richness on mountaintops is generally less than that of lowland areas. Coincident with this decline in species richness with increasing elevation is an increase in the altitudinal range of species.
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Altitudinal Range and Habitat of Triclads in Streams of the Lake Tahoe Basin

American Midland Naturalist, 1988
-The distribution of freshwater triclads in streams, springs and seeps of the Lake Tahoe Basin was studied. Twenty-one streams were investigated from source to mouth in an elevation range from 1902 to 2792 m (6235 to 9160 ft), and collecting sites were established approximately every 400 m (quarter mile).
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Climatic and morphometric controls on the altitudinal range of glaciers, British Columbia, Canada

The Holocene, 2010
To examine the relation between climate and glacier extent, we compared gridded, monthly temperature and precipitation data to the altitudinal range of glaciers in British Columbia, Canada. We related glacier relief to ablation season temperature (June—August), accumulation season precipitation (September— March), and morphometric ...
Erik Schiefer, Brian Menounos
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