Richard I. Yeaton
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View article: Regeneration dynamics in arid subtropical thicket, South Africa
Regeneration dynamics in arid subtropical thicket, South Africa Open
In arid environments nurse-plants modify localised habitats and create regeneration opportunities for seedlings vulnerable to hostile conditions created by biotic and abiotic factors. Facilitation is thus recognised as an important process…
View article: Community structure of a southern Chihuahuan Desert grassland under different grazing pressures
Community structure of a southern Chihuahuan Desert grassland under different grazing pressures Open
The effect of different grazing intensities on the semiarid grasslands of the southern Chihuahuan Desert was studied using a fence-line contrast between a moderately grazed cattle ranch, from which goats and sheep had been excluded for for…
View article: Mean annual rainfall and the population growth (1993–2002) and potential distribution of Themeda triandra in the shrubby vegetation of the southern Nama-karoo
Mean annual rainfall and the population growth (1993–2002) and potential distribution of Themeda triandra in the shrubby vegetation of the southern Nama-karoo Open
We investigated the relationship between mean annual rainfall (MAR) and the population growth (1993–2002) of Themeda triandra, to test the hypothesis that annual rainfall is a factor controlling the potential distribution of this palatable…
View article: Competitive interactions between overstorey proteas and sprouting understorey species in South African mountain fynbos
Competitive interactions between overstorey proteas and sprouting understorey species in South African mountain fynbos Open
Previous studies in the mountain fynbos of South Africa have demonstrated that short fire cycles favour the establishment of dense covers of understorey sprouters while longer fire intervals enable the establishment from seed of overstorey…
View article: The effect of short fire cycles on the cover and density of understorey sprouting species in South African mountain fynbos
The effect of short fire cycles on the cover and density of understorey sprouting species in South African mountain fynbos Open
Two South African mountain fynbos sites were studied to determine the effect of short fire cycles on the cover and density of understorey sprouting species and their subsequent effect on plant‐species richness. Frequent fires (4–6 years be…
View article: The effect of overstorey proteas on plant species richness in South African mountain fynbos
The effect of overstorey proteas on plant species richness in South African mountain fynbos Open
Summary Two South African mountain fynbos sites, similar in drainage, elevation, slope angle, slope aspect and soil type but with differing fire histories, were studied to measure how the effect of high densities of overstorey proteas in o…
View article: Competitive interactions between the perennial shrub Leipoldtia constricta and an annual forb, Gorteria diffusa
Competitive interactions between the perennial shrub Leipoldtia constricta and an annual forb, Gorteria diffusa Open
Competitive interactions were studied between individuals of the perennial shrub, Leipoldtia constricta L. Bol., and an annual forb, Gorteria diffusa Thunb. in the winter rainfall region of the Karoo using nearest-neighbour analysis. S…
View article: The structure of a grass community in Burkea africana savanna during recovery from fire
The structure of a grass community in Burkea africana savanna during recovery from fire Open
Three adjacent sites, differing in their fire histories, in the Eragrostis pallens–Digitaria eriantha association of the Burkea africana savanna at Nylsvley, northern Transvaal were compared. One site has been burned annually while the…
View article: CHANGES IN MORPHOLOGICAL CHARACTERISTICS OF PINUS ENGELMANNII OVER AN ELEVATIONAL GRADIENT IN DURANGO, MEXICO
CHANGES IN MORPHOLOGICAL CHARACTERISTICS OF PINUS ENGELMANNII OVER AN ELEVATIONAL GRADIENT IN DURANGO, MEXICO Open
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
View article: The altitudinal distribution of the genus Pinus in the Western United States and Mexico
The altitudinal distribution of the genus Pinus in the Western United States and Mexico Open
The altitudinal distributions of members of the genus Pinus were studied on mountain ranges in the western United States and Mexico. The community of pines on each mountainside consists of members of three major groupings - long-needled Di…
View article: ECOMORPHOLOGY AND HABITAT UTILIZATION OF ECHINOCEREUS ENGELMANNII AND E. TRIGLOCHIDIATUS (CACTACEAE) IN SOUTHEASTERN CALIFORNIA
ECOMORPHOLOGY AND HABITAT UTILIZATION OF ECHINOCEREUS ENGELMANNII AND E. TRIGLOCHIDIATUS (CACTACEAE) IN SOUTHEASTERN CALIFORNIA Open
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
View article: SEEDLING CHARACTERISTICS AND ELEVATIONAL DISTRIBUTIONS OF PINES (PINACEAE) IN THE SIERRA NEVADA OF CENTRAL CALIFORNIA: A HYPOTHESIS
SEEDLING CHARACTERISTICS AND ELEVATIONAL DISTRIBUTIONS OF PINES (PINACEAE) IN THE SIERRA NEVADA OF CENTRAL CALIFORNIA: A HYPOTHESIS Open
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
View article: Fall Resource Division in Santa Cruz Island Hummingbirds
Fall Resource Division in Santa Cruz Island Hummingbirds Open
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.