relation avec les principaux groupes à destination de l'Australie, le long de l'axe de la GreatDividingRange. L'influence culturelle irlandaise est réduite par rapport au poids démographique.
Stratigraphy and correlation of glacial deposits of the Rocky Mountains, the Colorado Plateau and the ranges of the Great Basin in Quaternary glaciations in the Northern Hemisphere.
Colorado Plateau ; Etats-Unis ; Glaciaire ; Great Basin ; Géographie de l'Amérique ; Montagne ; Quaternaire zones moyennes ; Rocky Mountains ; Stratigraphie
Tills of eight and possibly nine Pleistocene glaciations are recognized in the region of the Rocky Mountains, the Colorado Plateau and the ranges of the Great Basin, except in the Yellowstone Park area where twelve are recognized.
Australia's box-ironbark forests and woodlands once covered 14 per cent of the State of Victoria on the riverine plains and foothills of the GreatDividingRange. But 83 per cent of the total original habitat has been destroyed and what remains
A set of 50 1:50,000 scale Ordnance Survey maps which cover the entire coastline of Ireland, and a single 1:850,000 scale map are used to perform a divider dimension analysis over step lengths from 100 m to 10 km (using the 1:50,000 scale maps
) and 17 km to 170 km (using the 1:850,000 scale map). The coastline is divided into 39 stretches and a divider dimension analysis is performed on each. A variation of divider dimension is found as the coast in traversed, with the dimension tending
to be higher on the western coast. The combined data from all the maps is used to create a Richardson plot which allows a power law to be produced to estimate the length of the Irish coast over step lengths ranging from 100 m to 100 km.
Revealing diversity patterns of vascular plants and their causes in semiarid high mountain regions. A top-down approach for great basin mountain ranges, USA
Aridité ; Biodiversité ; Echelle multidimensionnelle ; Etats-Unis ; Etats-Unis de l'Ouest ; Great Basin ; Montagne ; Végétation
Aridity ; Biodiversity ; Great Basin ; Mountain ; Multidimensional scaling ; United States of America ; Vegetation ; Western United States
Les AA. étudient la biodiversité des régions montagneuses semi-arides de Great Basin aux Etats-Unis. Dans une approche multiscalaire, ils analysent les mécanismes et les processus à l'origine de cette diversité.
Late Quaternary environments and biogeography in the Great Basin
Amérique du Nord ; Etats-Unis ; Great Basin ; Géographie de l'Amérique ; Paléo-environnement ; Paléobiogéographie ; Pléistocène supérieur ; Quaternaire supérieur ; Quaternaire zones moyennes ; Wisconsinien supérieur
. Forested habitats would have been isolated habitat islands, as they are today. Boreal small mammals including pikas and heather voles, were able to colonize the Great Basin mountain ranges during the late Pleistocene.
Plant and animal remains found in packrat (Neotoma spp.) middens and cave fill from the eastern and southern Great Basin region reveal the presence of subalpine conifers and boreal mammals at relatively low elevations during the Late Wisconsin
Temporal trends in the quality of streamwater in an alpine environment: Green Lakes Valley, Colorado Front Range, USA
Charge en suspension ; Colorado ; Cours d'eau ; Ecosystème ; Etats-Unis ; Front Range ; Hydrochimie ; Montagne ; Pollution ; Qualité de l'eau ; Variation saisonnière ; Végétation
Colorado ; Ecosystem ; Front Range ; Hydrochemistry ; Mountain ; Pollution ; Seasonal variation ; Stream ; Suspended load ; United States of America ; Vegetation ; Water quality
The A. reports empirical records of water quality at four high elevation sites in the alpine environment of the Green Lakes Valley, east of the Continental Divide in the Front Range. At these sites, partial records for the past 25 years, and more
Colonisation of Spartina on a tidal water divide, Danish Wadden Sea
The spread of Spartina on a tidal water divide has been followed in subsequent aerial photos. Spartina first appeared in the area in 1964, it spread rapidly to 1976. From 1976 to 1988 a significant die-back is observed. This die-back was more than
recovered in 1995. The die-back period had a number of cold winters, which points to the role of ice in the Spartina die-back. In comparison with the local tidal range, possible future planting of Spartina in salt marsh management strategies should take
Analyse statistique sur cartes topographiques de plus de 100 bassins hydrographiques de 3e ordre, dans une douzaine de chaînes montagneuses de la Province Basin and Range. Comparaison de la taille, du degré des pentes, du relief et de l'homogénéité
des bassins des chaînes montagneuses du désert de Sonora et du Great Basin.
, their basin axis, and the main ridge. The first step in the dividing process is to identify the first-order ridges between the catchment areas of all basins. Based on the selected basins, the resulting parts of the mountain range can be regarded
According to given definitions, culminations can be identified with the orographical centers of mountain groups of different sizes. Investigating a mountain range, the method presented starts with the identification of surrounding basins
as orographical units. The second-order division starts the same way: The main basins are divided into a number of second-order basins, chosen among basins of bigger rivers, joining the main ridge or a first-order ridge and running directly down to the axis
The AA. divide the 388 species of endangered plants recorded in the first volume of China Plant Red Data Book into 7 types : living fossils| ancient relics| species of only a small range| monospecific genus| the important element of the flora
Scale development aspects of plant diversity in semiarid high mountain regions. An exemplary top-down approach for the Great Basin (USA)
Biodiversité ; Domaine aride ; Echelle ; Ecologie du paysage ; Ecosystème ; Espèce végétale ; Etats-Unis ; Great Basin ; Haute montagne ; Méthodologie ; Végétation
Arid area ; Biodiversity ; Ecosystem ; Great Basin ; High mountain ; Landscape ecology ; Methodology ; Plant species ; Scale ; United States of America ; Vegetation
The book documents high mountain biodiversity using the sparsely populated Great Basin region as a field laboratory. Its numerous small mountain ranges are separated by low-lying arid valleys. The repeated contrast between alpine and desert
environments across one quarter of the North American continent gives rise to a surprisingly rich flora. These alternating basins and mountain ranges are a perfect match of explain patterns and processes in plant diversity using a multi-scale approach. Through
Archéologie ; Cation-ratio dating ; Cima, région ; Coso Range ; Datation ; Datation par rapport cationique ; Datation par taux de lessivage ; Domaine aride ; Etats-Unis ; Expérimentation ; Gravure rupestre ; Great Basin ; Géochimie ; Géographie
This paper presents chronometric age determinations of petroglyphs from the Coso Range and Cima volcanic field and relative dating from other locations in the western United States using the new rock varnish technique of cation-ratio dating. Our
results verify the proposed Great Basin relative stylistic chronology, which indicates that curvilinear abstract was followed by rectilinear abstract and representational. However, these styles have greater antiquity than previously proposed, suggesting
new interpretations for the significance of the Coso Range rock art. (The A.).
Interaktionen von Vegetation und frostbedingter Morphodynamik in den Gebirgen des semiariden Great Basin.
Les interactions entre la végétation et la morphodynamique en milieu froid dans la chaîne des Mountain ranges du Grand Bassin semi-aride des Etats-Unis.
Conifère ; Espèce végétale ; Etats-Unis ; Forêt ; Froid ; Great Basin ; Géomorphologie climatique ; Haute montagne ; Limite supérieure de la forêt ; Montagne ; Mountain Ranges ; Nevada ; Sol ; Solifluxion
Climatic geomorphology ; Conifer ; Forest ; Great Basin ; High mountain ; Mountain ; Nevada ; Plant species ; Soil ; Solifluction ; Tree line ; United States of America