نتایج جستجو برای: deserts
تعداد نتایج: 2047 فیلتر نتایج به سال:
Luminescence dating has truly transformed the science of deserts and drylands and has necessitated a revision of conventional interpretation of sedimentary records and stratigraphic correlations. This contribution discusses key questions in palaeoclimatology of global deserts, the meaning of a luminescence age on desert sand and presents a review of luminescence-dated aeolian sand records from ...
T he Antarctic Dry Valleys, situated in the Ross Sea region of Eastern Antarctica, are often referred to as one of the most extreme environments on Earth. Although this statement is subject to some argument, largely surrounding the issue of what ‘‘extreme’’ actually means, there is no arguing that the combination of macroenvironmental and microenvironmental conditions to which organisms living ...
OBJECTIVES We explored new ways to identify food deserts. METHODS We estimated physical and economic access to supermarkets for 5 low-income groups in Seattle-King County, Washington. We used geographic information system data to measure physical access: service areas around each supermarket were delineated by ability to walk, bicycle, ride transit, or drive within 10 minutes. We assessed eco...
Night-time stomatal conductance (g(night)) occurs in many ecosystems, but the g(night) response to environmental drivers is relatively unknown, especially in deserts. Here, we conducted a Bayesian analysis of stomatal conductance (g) (N=5013) from 16 species in the Sonoran, Chihuahuan, Mojave and Great Basin Deserts (North America). We partitioned daytime g (g(day)) and g(night) responses by de...
Creosote bushes (Larrea tridentata) form islands of fertility that influence annual plant abundances in desert ecosystems, and the distribution of native and non-native annuals with respect to creosote may differ. We established plots on the north and south facing sides of L. tridentata in the Mojave and Sonoran Deserts within four different microhabitats spanning from under the shrub canopy in...
In recent decades Spain has suffered a gradual process of depopulation and exodus from rural areas to large capitals. The España Vaciada political social movement denounces the country’s territorial inequality, while government is working on strategic plan address demographic challenge. At media level, there concern about citizens’ access local quality journalistic service, key strengthening co...
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