Search Results - "Yeaton, R.I."

Regeneration dynamics in arid subtropical thicket, South Africa by Adie, H., Yeaton, R.I.

“…In arid environments nurse-plants modify localised habitats and create regeneration opportunities for seedlings vulnerable to hostile conditions created by…”
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Community structure of a southern Chihuahuan Desert grassland under different grazing pressures by Yeaton, R.I., Flores Flores, J.L.

“…The effect of different grazing intensities on the semiarid grasslands of the southern Chihuahuan Desert was studied using a fence-line contrast between a…”
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The replacement of arborescent cactus species along a climatic gradient in the southern Chihuahuan Desert: competitive hierarchies and response to freezing temperatures by Flores F, J.-L, Yeaton, R.I

“…In the southern region of the southern Chihuahuan Desert three common species of arborescent cacti are distributed over a north-west to south-east climatic…”
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Mean annual rainfall and the population growth (1993–2002) and potential distribution of Themeda triandra in the shrubby vegetation of the southern Nama-karoo by Smith, F.R., Yeaton, R.I., Cowling, R.M.

“…We investigated the relationship between mean annual rainfall (MAR) and the population growth (1993–2002) of Themeda triandra, to test the hypothesis that…”
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Disturbance by the mound-building termite, Trinervitermes trinervoides, and vegetation patch dynamics in a semi-arid, southern African grassland by Smith, F.R, Yeaton, R.I

“…Changes in the composition and abundance of grasses and shrubs, soil fertility, and the productivity and nutrition of the grass, Themeda triandra, were…”
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Structure and function of the Namib dune grasslands: characteristics of the environmental gradients and species distributions by Yeaton, R.I

“…(1) Associations of perennial grasses on dune slopes in the Namib Desert were studied across a complex environmental gradient from the Atlantic Ocean (west) to…”
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Ecomorphology and habitat utilization of Echinocereus engelmannii and Echinocereus triglochidiatus (Cactaceae) in southeastern California by Yeaton, R.I

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Organization of vegetation mosaics in the Acacia Schaffneri-Opuntia streptacantha association, Southern Chihuahuan Desert, Mexico by Yeaton, R.I, Romero Manzanares, A

“…(1) A preliminary analysis of the species-rich Acacia schaffneri-Opuntia streptacantha association in the southern Chihuahuan Desert, Mexico, used data…”
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Seedling characteristics and elevational distributions of pines (Pinaceae) in the Sierra Nevada of central California: a hypothesis by Yeaton, Richard I.

“…Seven species of the genus Pinus occupy a 3000-m elevational gradient on the western slope of the Sierra Nevada in central California. Three species of…”
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Intraspecific competition in a population of the stilt palm, Socratea durissima (Oerst.) Wendl. on Barro Colorado Island, Panama by Yeaton R.I

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pattern of colonization of epiphytes on calabash trees (Crescentia alata HBK.) in Guanacaste Province, Costa Rica by Yeaton, R.I, Gladstone, D.E

“…We examined the structure of the community of epiphytes growing on Crescentia alba trees in Santa Rosa National Park. Costa Rica. Four orchid species were…”
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Competition and spacing in plant communities: the northern -Mohave Desert by Yeaton, R.I, Cody, M.L

“…Intraspecific and interspecific spacing and competition were studied in a diverse plant community in the northern Mohave Desert. Measurements of the sizes of…”
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Aspects of the population biology of sugar pine (Pinus lambertiana Dougl.) on an elevational gradient in the Sierra Nevada of central California by Yeaton, R.I

“…Three populations of sugar pine (Pinus lambertiana Dougl.) were studied at low, middle and upper points in its elevational distribution on the western slopes…”
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Tree succession in the subalpine forest of the neo-volcanic range, south-central Mexico by Yeaton, R.I, Romero Manzanares, A, Vera Castillo, G, Vielegas, S

“…Secondary succession occurs among the tree species in the subalpine forest of the Neo-volcanic Range of south-central Mexico. The age and mean trunk diameter…”
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Changes in morphological characteristics of Pinus engelmannii over an elevational gradient in Durango, Mexico by Yeaton, R.I, Yeaton, R.W, Waggoner, J.P. III

“…Needle number per fascicle has been used to distinguish two varieties of pine (Pinus engelmannii Carr., and P. engelmannii var. blancoi). This character, along…”
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Morphological growth patterns of saguaro (Carnegiea gigantea: Cactaceae) on flats and slopes in Organ Pipe Cactus National Monument, Arizona by Yeaton, Richard I., Karban, Richard, Wagner, Holliday B.

“…The allometric growth patterns as determined by size measurements of two subpopulations of saguaro, Carnegiea gigantea, were studied at the extremes of a local…”
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Microhabitat differences between Opuntia parryi and Opuntia littoralis (Cactaceae) in the mixed chaparral-inland coastal sage association by Yeaton R.I, Layendecker E, Sly K.S, Eckert R

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The effect of predation on the elevational replacement of digger pine by ponderosa pine on the western slopes of the Sierra Nevada [California, Pinus sabiniana, Pinus ponderosa] by Yeaton, R.I

“…Digger pine (Pinus sabiniana Dougl.) is replaced abruptly by ponderosa pine (P. ponderosa Laws.) on the western slopes of the Sierra Nevada in central…”
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The successional replacement of ponderosa pine by sugar pine in the Sierra Nevada [Pinus ponderosa, Pinus lambertiana, California] by Yeaton, Richard I.

“…Differential utilization of a limiting resource has been hypothesized as the mechanism through which ponderosa and sugar pine are maintained over an…”
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The altitudinal replacement of digger pine [Pinus sabiniana] by ponderosa pine on the western slopes of the Sierra Nevada [California] by Yeaton, Richard I., Yeaton, Robin W., Horenstein, Julie E.

“…Digger pine is a low elevational 3-needled species, replaced abruptly altitudinally by Ponderosa pine, another 3-needled species. The rates of seedling and…”
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