to spanwise gradients in deposition rates. Initial vegetationcolonization of barchan horns causes shear between the anchored sides and the advancing centre of the dune, which rotates the planform brinkline angle from concave- to convex-downwind. This reduces
The process is described in terms of variations in the stabilization of wind-parallel cross-sectional dune slices. The AA. hypothesize that stabilization of individual dune slices is the predictable result of feedbacks initiated from colonization
of vegetation on the slipface, which can only occur when slipface deposition rates are less than the deposition tolerance of vegetation. Under a constant vegetation growth regime the transformation of a barchan dune into a parabolic dune is a geometric response
slipface deposition rate and allows vegetation to expand inward from the arms to the dune centre. The planform inversion of bare barchans dunes into vegetated parabolic dunes ultimately leads to complete stabilization.
Aeolian transport ; Barchan ; Coastal environment ; Coastal geomorphology ; Model ; New Zealand ; Plant colonization ; Sand ; Sediment transport ; South Island ; Spit
Arena ; Barcán ; Colonización vegetal ; Flecha litoral ; Geomorfología litoral ; Isla del Sur ; Litoral ; Modelo ; Nueva Zelanda ; Transporte eólico ; Transporte sedimentario
Farewell Spit runs along South Island, New Zealand. The spit is composed of barchan dunes, sand sheets and vegetated linear dunes. Analysis of aerial photography indicates a rapid colonization of the spit by vegetation which has expanded in area
by 75% since 1950. Vegetationcolonization preferentially occurs on the southern side of the spit. Sand sourced from longshore drift appears to be the primary source of beach sediment. Occasional cyclone events cause erosion, but this is balanced
Laboratory experiments on sequential scour/deposition and their application to the development of banded vegetation
The significance of soil, water and landscape processes in banded vegetation patterning
Arid area ; Experimentation ; Kenya ; Over-grazing ; Plant colonization ; Rainfall simulation ; Rift Valley ; Slope ; Soil erosion ; Soil moisture ; Splash ; Vegetation ; Water erosion
Colonisation végétale ; Domaine aride ; Erosion des sols ; Erosion hydrique ; Expérimentation ; Humidité du sol ; Kenya ; Rift Valley ; Simulation de pluie ; Splash ; Surpâturage ; Versant ; Végétation
variations in moisture storage capacity. Experimental results indicate that vegetation bands at the scale observed at Baringo (Rift Valley, Kenya) are consistent with development by sequential scour and deposition, caused by some combination of sheetwash
La colonisation des friches par le pin d'Alep (Pinus halepensis Miller) en Languedoc méditerranéen. (Colonization of old fields by Pinus halepensis Miller in a Mediterranean part of France)
this ecotone zone. Within Lake Superior Provincial Park, Ontario, they characterize the regeneration status of tree species at and near the northern limit of sugar maple, and identify temporal colonization patterns of dominant tree species to determine
if colonization is continuous or relates to specific episodes (triggered by climatic or disturbance events).
Colonization success of a biennial plant species: experimental field studies of species cohabitation and replacement
L'étude de Dipsacus sylvestris (espèce bisannuelle de chardon) sur 52stations réparties dans 8types de végétation, et menée pendant 5ans dans le Michigan, apporte 3principaux résultats: Dipsacus sylvestris possède une durée de germination pouvant
largement dépasser une année, la floraison n'intervenant souvent qu'après 2 ou 3ans. Cette espèce colonise à partir des ouvertures qu'elle engendre dans la végétation, et entraîne ainsi l'installation d'autres espèces| son développement n'entrave pas la
The goal of the study was to estimate ages of lichen colonization on the oldest moraines of the Ecology and White Eagle Glaciers on King George Island and on the Principal Cone of Penguin Island volcano. The first lichenometric studies
of the oldest moraine ridges are of the Little Ice Age and were colonized at the beginning of the twentieth century. The mid-twentieth century age of lichen colonization on the historically active Penguin Island volcano might support the date of the last
The distribution of riparian vegetation in relation to channel morphology is poorly understood in canyon rivers, which are characterized by in-channel fluvial sediment deposits rather than flood plains. This study focuses on vegetation and sandbar
characteristics in 2 reaches of the lower Little Colorado River canyon in Arizona : one reach with ephemeral flow from the watershed, and another with perennial baseflow from a spring. Both reaches have been colonized by the exotic Tamarix chinensis, a riparian
Bird ; Ecosystem ; Fauna ; Iceland ; Indonesia ; Island ; Population dynamics ; Vegetation ; Volcanic eruption ; Volcanism
, there is an extreme difference in climate of the two islands and thus in the kind of available life forms, their means of colonization and rate of growth.
Lichenometric dating of Little Ice Age glacier moraines using explicit demographic models of lichen colonization, growth, and survival
Alaska ; Datation ; Dynamique de la végétation ; Ghisma ; Glacier ; Holocène ; Incertitude ; Lichénométrie ; Modèle ; Moraine ; Petit âge glaciaire ; Quaternaire
Alaska ; Dating ; Glacier ; Holocene ; Lichenometry ; Little ice age ; Model ; Moraine ; Quaternary ; Uncertainty ; Vegetation dynamics
for the biological processes that govern lichen populations : colonization, growth, and survival. Working with 2 lichen taxa, the AA. used multinomial-based likelihood functions to compare model predictions with measured lichen populations, using only the thalli
Vegetation patchiness and implications for landscape function : the case of Pteronia incana invader species in Ngqushwa Rural Municipality, Eastern Cape, South Africa
Duricrust ; Eastern Cape ; Erosion control ; Grassland ; Plant colonization ; Runoff ; Scrub ; Soil erosion ; Soil moisture ; South Africa ; Vegetation
Afrique du Sud ; Colonisation végétale ; Eastern Cape ; Ecoulement ; Encroûtement ; Erosion des sols ; Formation arbustive ; Formation herbacée ; Humidité du sol ; Lutte contre l'érosion ; Végétation