Results 251 to 260 of about 252,220 (287)
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Uncertainties and errors in algorithms for elevation gradients
International Journal of Geographical Information Science, 2020Elevation gradients are primary components of slope and aspect. Significant concerns remain when computing gradients if noise (perturbing non-DEM data) is present.
Dong Shi +4 more
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Nutrient use by tropical ant communities varies among three extensive elevational gradients: A cross-continental comparison [PDF]
Global Ecology and Biogeography, 2023 Aim: Many studies demonstrate that climate limits invertebrates along tropical elevational gradients, but we have only a rudimentary understanding of the role of nutrient limitation and climatic seasonality. Here we examined the relationships between ant
Nathan J. Sanders +2 more
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Ecological and Land Use Studies Along Elevational Gradients
Mountain Research and Development, 2007 Abstract Mountain regions and UNESCO Mountain Biosphere Reserves (MBRs) encapsulate broad elevational ranges, cover large gradients of geological, topographical and climatic diversity, and thus host greater biodiversity than the surrounding lowlands.
Körner Christian +2 more
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Elevation gradient of intrathoracic pressure
The American Journal of Medicine, 1957Intrathoracic (intrapleural) pressure was measured in 15 anesthetized mongrel dogs held in the vertical position. A small balloon attached to a polyethylene catheter was inserted, without admission of air, into the chest through the 3rd intercostal space, or above the first rib, and passed down to the costophrenic sulcus.
J J, KRUEGER, T, BAIN, J L, PATTERSON
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Stimulation of Insulin Release by Elevated Pressure Gradient
Endocrinology, 1976In an attempt to stimulate the contractile events which presumably lead to intracellular translocation and exocytosis of the beta granule, the effect of elevated pressure on the rate of insulin release was studied. In vitro preparations of pancreas were incubated in media of low glucose content (1.65 mM) for several consecutive 15 min periods.
H, Aleyassine, R J, Gardiner
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2009
Abstract There are striking changes in vegetation from lowlands to high mountain-tops, similarly to that from the Equator towards the poles. These changes entail a reduction in the structural and floristic diversity of ecosystems and a reduction in biomass from the tall lowland forests to low stature alpine heaths, or arctic tundra.
Laszlo Nagy, Georg Grabherr
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Abstract There are striking changes in vegetation from lowlands to high mountain-tops, similarly to that from the Equator towards the poles. These changes entail a reduction in the structural and floristic diversity of ecosystems and a reduction in biomass from the tall lowland forests to low stature alpine heaths, or arctic tundra.
Laszlo Nagy, Georg Grabherr
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Soil Mercury Along an Elevation Gradient in Northern Borneo
2023The biogeochemical cycling of mercury (Hg) is an important topic of study due to the health implications of the release of this toxic element in the environment. Tropical ecosystems have been understudied, and examining elevational gradients can provide insights into mechanisms controlling soil Hg concentrations.
Brearley, Francis Q. +4 more
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Does allochthony in lakes change across an elevation gradient?
Ecology, 2015Ecosystems are subsidized with inputs of mass and energy from their surroundings. These allochthonous inputs regulate many ecosystem characteristics. In inland waters, terrestrial inputs of organic matter regulate food‐web structure, ecosystem metabolism, water clarity, and thermal stratification.
Kevin C, Rose +3 more
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ELEVATIONAL GRADIENTS IN DIVERSITY OF SMALL MAMMALS
Ecology, 2005(Uploaded by Plazi for the Bat Literature Project) A global analysis of elevational diversity trends for nonvolant small mammals revealed a clear pattern of mid-elevational peaks in species richness. Fifty-six data sets were used to test the predictions of a null model (the mid-domain effect) and climatic hypotheses.
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Elevational gradient in the cyclicity of a forest‐defoliating insect
Population Ecology, 2012AbstractObserved changes in the cyclicity of herbivore populations along latitudinal gradients and the hypothesis that shifts in the importance of generalist versus specialist predators explain such gradients has long been a matter of intense interest. In contrast, elevational gradients in population cyclicity are largely unexplored.
Kyle J. Haynes +2 more
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