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Maternal habitat affects germination requirements of Anabasis setifera, a succulent shrub of the Arabian deserts Acta Botanica
El-Keblawy,Ali; Gairola,Sanjay; Bhatt,Arvind.
The effects of maternal habitat on light and temperature requirements during germination were assessed for the succulent desert shrub Anabasis setifera. Seeds were collected from the Mediterranean habitats of Egypt and the hyper-arid subtropical habitats of the United Arab Emirates (UAE). Seeds from the two populations were germinated in three temperature treatments in both a light/dark regime and continuous darkness. Seeds from the Egyptian population germinated significantly greater and faster than those of UAE. Seeds stored for four months at room temperatures have little dormancy and germinate at wide range of temperatures and light conditions, but seeds stored four months in the natural habitat lost their ability to germinate and rotted 10 days after...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anabasis setifera; Desert; Halophyte; Maternal habitat; Seed germination.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100035
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Importance of Ionic and Osmotic Components of Salt Stress on the Germination of Four Quinua (Chenopodium quinoa Willd.) Selections Chilean J. Agric. Res.
Delatorre-Herrera,José; Pinto,Manuel.
The influence of the components of saline stress (osmotic and ionic factors) were evaluated during the germination of four quinua (Chenopodium quinoa Willd.) selections in Chile, two collected in the arid northern highland region with saline soils (Amarilla and Roja) and the other two from the rainy southern region with non-saline soils (Hueque and Pucura). The seeds were treated with different saline concentrations (0, 0.2, 0.4, 0.8 and 1.2 M NaCl). Germination kinetics shows that the control treatments of the four selections reach 100% germination. With application of 0.4 M NaCl (LD50max) germination was reduced by 53% in the Amarilla selection and 89.9% in Hueque. The germination rate was lower for the seeds from non-saline areas, which reached...
Tipo: Journal article Palavras-chave: Salinity; Imbibition; Seeds; NaCl; Altiplano; Desert.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000400001
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Did ash fall from Puyehue-Cordón Caulle volcanic complex affect ant abundance and richness in the Patagonian steppe? Ecología austral
Pirk,Gabriela I.
Natural disturbances are important components of ecosystem dynamics. Large scale disturbances produced by volcanoes, have been poorly studied because of their low frequency, the lack of baseline studies due to their unpredictability, the impossibility of replication, and the difficulty of conducting long-term studies to monitor ecosystem recovery. The recent eruption of the Puyehue-Cordón Caulle volcanic complex (June 2011), which produced an ash fall covering 24 million ha of Patagonia, provides a unique opportunity of studying this type of disturbance in areas with baseline data. The summer before the ash fall (2011) ant communities were characterized in areas of the Patagonian steppe which were later covered with 4 cm of fine ash. The aim of this study...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Desert; Formicidae; Natural disturbance; Volcanic eruption.
Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2014000100004
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Anpernirrentye: a Framework for Enhanced Application of Indigenous Ecological Knowledge in Natural Resource Management Ecology and Society
Walsh, Fiona J.; CSIRO Ecosystem Sciences; Fiona.Walsh@csiro.au; Dobson, Perrurle V.; senior Arrernte woman;; Douglas, Josie C.; CSIRO Ecosystem Sciences; josie.douglas@csiro.au.
Tipo: Peer-Reviewed Synthesis Palavras-chave: Aboriginal economy; Australia; Biodiversity; Bush foods; Cultural values; Desert; Indigenous knowledge system; Natural resource management; Social– Ecological system.
Ano: 2013
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Road Zone Effects in Small-Mammal Communities Ecology and Society
Bissonette, John A.; USGS Utah Cooperative Fish and Wildlife Research Unit, Department of Wildlands Resources, College of Natural Resources, Utah State University; john.bissonette@usu.edu; Rosa, Silvia A.; USGS-Utah Cooperative Fish and Wildlife Research Unit, Department of Wildlands Resources, College of Natural Resources, Utah State University; silviarosa2007@gmail.com.
Our study focused on the putative effects of roads on small-mammal communities in a high desert region of southern Utah. Specifically, we tested whether or not roads create adjacent zones characterized by lower small- mammal densities, abundance, and diversity. We sampled abundance of small mammals at increasing distances from Interstate 15 during two summers. We recorded 11 genera and 13 species. We detected no clear abundance, density, or diversity effects relative to distance from the road. Only two of 13 species were never captured near roads. The abundance of the remaining 11 small mammal species was either similar at different distances from the road or higher closer to the road. We conclude that although roads may act as barriers and possible...
Tipo: Peer-Reviewed Reports Palavras-chave: Density; Desert; Habitat quality; Road ecology; Species abundance; Utah; Vertebrate abundance..
Ano: 2009
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Analyzing Resources for the Production of High-Value Agricultural Products in the California High Desert AgEcon
Phillips, Jon C.; Hays, Lauren.
Urbanization of previously undeveloped land is a critical concern in Southern California. Housing development brings with it several potentially detrimental effects, among which are hardening of the landscape (pavement), diminished water absorption into the soil, and increased harmful runoff into the Pacific Ocean. The High Desert Region of San Bernardino County, California is an area currently experiencing significant development pressure. It is our belief that the development of agricultural production could, to some extent, substitute for residential and commercial development, and that agricultural production is a more sustainable use of the land in this area. This report examines and inventories resources of an unincorporated area near the Cajon Pass...
Tipo: Working or Discussion Paper Palavras-chave: High-value agricultural products; Resources; Desert; California; Strategic planning; Sustainable agriculture; Demographics; Direct marketing; Farm Management; Production Economics.
Ano: 2007 URL: http://purl.umn.edu/7427
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Microhabitat selection by Octomys mimax (Rodentia: Octodontidae) in the Monte Desert is affected by attributes and thermal properties of crevices RChHN
CAMPOS,VALERIA E; ANDINO,NATALIA; CAPPA,FLAVIO M; REUS,MARÍA L; GIANNONI,STELLA M.
The viscacha rat (Octomys mimax; Rodentia, Octodontidae) belongs to a monotypic genus endemic to western Argentina and inhabits lowland deserts with abundant rocks and ravines. Our objectives were 1) to determine the attributes of crevices (depth, height, width, entrance orientation, and rock color) that influence selection by the viscacha rat; 2) to compare the range and variance of temperature inside and outside crevices, at the soil surface, at the rock surface and in the air; and 3) to evaluate if there is a thermal gradient inside crevices, comparing range and variance of temperature at the soil surface at different depths (0, 30 and 50 cm). The viscacha rat did not use microhabitats in proportion to availability; the species selected deep and narrow...
Tipo: Journal article Palavras-chave: Desert; Rock dwelling mammal; Suitable habitat; Viscacha rat.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000300008
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Population density and reproduction of two Peruvian leaf-eared mice (Phyllotis spp.) RChHN
ARANA,MARGARITA; RAMÍREZ,OSWALDO; SANTA MARÍA,SERGIO; KUNIMOTO,CESAR; VELARDE,RODRIGO; DE LA CRUZ,CECILIA; RUÍZ,MARíA LUISA.
Population density and reproduction were studied in two leaf-eared mice (Phyllotis spp.) in the Peruvian locality known as Lomas de Lachay. Density varied between 0-3 individuals ha-1 in P. andium, and between 0-12 individuals ha-1 in P. amicus. An annual cycle of population abundance was observed in both species. Phyllotis amicus showed no seasonal reproductive activity, but P. andium had seasonal reproduction with pregnant females principally observed between July and September. Differences in juvenile weight were related to litter size. It is likely that two young was the optimal litter size in the harsh and seasonal xeric environment of Lomas de Lachay. Our results suggest that P. amicus maintains low, highly dispersed populations in a harsh...
Tipo: Journal article Palavras-chave: Ecology; Phyllotis; Rodents; Population; Desert.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400010
Registros recuperados: 8
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