scholarly journals Studies in Nearctic desert sand dune Orthoptera. Part 11. A new arenicolous species of Stenopelmatus from Coachella Valley with key and biological notes

1968 ◽  
Vol 28 ◽  
pp. 124-131 ◽  
Keyword(s):  
Sand Dune ◽  
Coachella Valley ◽  
Desert Sand

The shape of desert sand dune grains

1981 ◽  
Vol 4 (3) ◽  
pp. 185-190 ◽  
Author(s):  
A.S. Goudie ◽  
A. Watson
Keyword(s):  
Sand Dune ◽  
Desert Sand

scholarly journals Detecting Areas Vulnerable to Sand Encroachment Using Remote Sensing and GIS Techniques in Nouakchott, Mauritania

2018 ◽  
Vol 10 (10) ◽  
pp. 1541 ◽  
Author(s):  
Diego Gómez ◽  
Pablo Salvador ◽  
Julia Sanz ◽  
Carlos Casanova ◽  
Jose Casanova
Keyword(s):  
Remote Sensing ◽  
Sand Dune ◽  
Near Infrared ◽  
Vulnerability Index ◽  
Local Authorities ◽  
Local Conditions ◽  
Gis Techniques ◽  
The North ◽  
Desert Sand ◽  
Sand Encroachment

Sand dune advances poses a major threat to inhabitants and local authorities in the area of Nouakchott, Mauritania. Despite efforts to control dune mobility, accurate and adequate local studies are still needed to tackle sand encroachment. We have developed a Sand Dune Encroachment Vulnerability Index (SDEVI) to assess Nouakchott’s vulnerability to sand dune encroachment. Said index is based on the geo-physical characteristics of the area (wind direction and intensity, slope and surface height, land use, vegetation or soil properties) with Geographic Information System (GIS) techniques that can support local authorities and decision-makers in implementing preventive measures or reducing impact on the population and urban infrastructures. In order to validate this new index, we use two remote sensing approaches: optical-Sentinel 2 and Synthetic Aperture Radar (SAR)–Sentinel 1 data. Results show that the greatest vulnerability is located in the north-eastern part of Nouakchott, where local conditions favor the advance of sand in the city, although medium to high values are also found in the eastern part. Optical images enabled us to distinguish desert sand using the ratio between near infrared/blue bands, and SAR Coherence Change Detection (CCD) imagery was used to assess the degree of stability of those sand bodies. The nature of the SDEVI index allows us to currently assess which areas are vulnerable to sand encroachment since we use long data records. Nevertheless, optical and SAR remote sensing allow sand evolution to be monitored on a near real-time basis.

Temperature And Humidity Within A Mobile Barchan Desert Sand Dune

2014 ◽  
Author(s):  
Michel Louge ◽  
Renee Richer ◽  
Ali Sultan ◽  
Anthony Hay ◽  
Jin Xu ◽  
...  
Keyword(s):  
Sand Dune ◽  
Desert Sand ◽  
Temperature And Humidity

scholarly journals Diversity and phenotypic analyses of salt- and heat-tolerant wild bean Phaseolus filiformis rhizobia native of a sand beach in Baja California and description of Ensifer aridi sp. nov.

2019 ◽  
Vol 202 (2) ◽  
pp. 309-322 ◽  
Author(s):  
Guadalupe Rocha ◽  
Antoine Le Queré ◽  
Arturo Medina ◽  
Alma Cuéllar ◽  
José-Luis Contreras ◽  
...  
Keyword(s):  
High Temperatures ◽  
Sand Dune ◽  
Phylogenetic Analyses ◽  
Carbon Sources ◽  
Wild Bean ◽  
Northern Mexico ◽  
Desert Sand ◽  
Wide Range ◽  
Alkaline Conditions ◽  
Strain Type

Abstract In northern Mexico, aridity, salinity and high temperatures limit areas that can be cultivated. To investigate the nature of nitrogen-fixing symbionts of Phaseolus filiformis, an adapted wild bean species native to this region, their phylogenies were inferred by MLSA. Most rhizobia recovered belong to the proposed new species Ensifer aridi. Phylogenetic analyses of nodC and nifH show that Mexican isolates carry symbiotic genes acquired through horizontal gene transfer that are divergent from those previously characterized among bean symbionts. These strains are salt tolerant, able to grow in alkaline conditions, high temperatures, and capable of utilizing a wide range of carbohydrates and organic acids as carbon sources for growth. This study improves the knowledge on diversity, geographic distribution and evolution of bean-nodulating rhizobia in Mexico and further enlarges the spectrum of microsymbiont with which Phaseolus species can interact with, including cultivated bean varieties, notably under stressed environments. Here, the species Ensifer aridi sp. nov. is proposed as strain type of the Moroccan isolate LMR001T (= LMG 31426T; = HAMBI 3707T) recovered from desert sand dune.

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