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Tesi sul tema "Arid regions ecology"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 30 luglio 2024

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1

夏江瀛 and Kong-ying Ha. "Microbial ecology of arid environments." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/193421.

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Deserts comprise the largest terrestrial biome, making up approximately one third of the Earth’s land mass. They are defined in terms of moisture deficit using the Aridity Index with values <1. A further delineation based on mean annual temperatures into hot (>18°C), cold (<18°C) and polar (<0°C) deserts is employed. In the absence of significant macrobiota, microorganisms are key to desert ecosystems. They are located in near-surface soils, and include a widespread hypolithic mode of colonization, where microbial biomass develops on the ventral surfaces of quartz and other translucent stones.

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2

McGee, P. A. "Role of mycorrhizas in the regeneration of arid zone plants /." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phm1448.pdf.

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3

Venter, Daniel Barend. "An ecological approach to the reclamation and improvement of arid rangelands using adapted fodder plants." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-03262007-124226.

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4

Chan, Yu-ki, and 陳裕琪. "Environmental genomic analysis of refuge habitats in hyper-arid deserts." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46917366.

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5

Goff, Bruce Franklin. "Dynamics of canopy structure and soil surface cover in a semiarid grassland." Thesis, The University of Arizona, 1985. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1985_503_sip1_w.pdf&type=application/pdf.

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6

Becker, Anne [Verfasser]. "Assessment of constructed wetlands in arid regions with special regard to ecology and multifunctionability / Anne Becker." Aachen : Shaker, 2012. http://d-nb.info/106619761X/34.

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7

Lee, Enhua School of Biological Earth &amp Environmental Science UNSW. "The ecological effects of sealed roads in arid ecosystems." Awarded by:University of New South Wales. School of Biological, Earth and Environmental Science, 2006. http://handle.unsw.edu.au/1959.4/26265.

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The effects of roads on landscapes and wildlife and their ecological processes are substantial and represent a major anthropogenic disruption to the natural environment. Current understanding of the impacts of roads for their strategic management is hampered by a lack of information on 1) the influence of the ecosystems on road effects, 2) the effects of roads on higher-order ecosystem responses (populations and communities), and 3) the overall impacts of roads on ecosystems and their wildlife (on both abiotic and biotic ecosystem components). This study used the Silver City Highway in arid Ne

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8

Lee, Enhua. "The ecological effects of sealed roads in arid ecosystems." Connect to this title online, 2006. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20070315.091920/.

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9

Coventry, Ben. "Woody debris and the effect on the predicted probability of lizard capture in Arcoona Creek, Gammon Ranges National Park, South Australia /." Title page, abstract and table of contents only, 1998. http://web4.library.adelaide.edu.au/theses/09AEVH/09aevhc873.pdf.

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10

Wood, Jamie Russell, and n/a. "Pre-settlement paleoecology of Central Otago�s semi-arid lowlands, with emphasis on the pre-settlement role of avian herbivory in South Island dryland ecosystems, New Zealand." University of Otago. Department of Geology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080211.142212.

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The vegetation communities that existed in the semi-arid intermontane basins and gorges of Central Otago prior to human settlement ~750 years B.P. are poorly understood. This is because of a lack of fossil evidence and complex restructuring by anthropogenic factors, especially increased fire frequency, and more recently mammalian grazing. There is also little information regarding the effect of the lost fauna on maintaining and structuring presettlement communities, both in Central Otago and throughout the eastern South Island dryland zone. This study aims to provide a clearer understanding of

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11

Boshoff, C. R. "Structure, distribution and phenology of perennial plant species in the Worcester Veld Reserve, in the arid winter rainfall region of the Southwestern Cape." Master's thesis, Faculty of Science, 1989. https://hdl.handle.net/11427/31874.

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High structural diversity amongst plant species in the arid winter rainfall region of southern Africa is common to other arid regions of the world. Details of the range and combinations of structural attributes in species, and within plant communities, are not widely known for southern African arid ecosystems. Hence little is known of how plant-form distributions vary within and between arid ecosystems. and of the environmental factors that may be responsible for any variations found. Nor is much information available on how phenological behaviour relates to the structural attributes of plant

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12

Badman, Francis John. "A comparison of the effects of grazing and mining on vegetation of selected parts of northern South Australia." Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phb136.pdf.

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Accompanying CD-ROM inside back cover, includes Appendices. Bibliography: leaves 242-266. This thesis examines the effects on vegetation at selected sites in northern South Australia of excluding various herbivores over a four and a half year period and of two intense but controlled grazing pulses over a six month period followed by an 18 month recovery period in a dune-swale land system. These changes are compared with changes recorded over an 11-year period at the Olympic Dam mine site. It found that short-term changes in vegetation revealed by ordination of periodical cover, density and spe

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13

Hearman, Amy. "A modelling study into the effects of rainfall variability and vegetation patterns on surface runoff for semi-arid landscapes." University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0047.

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[Truncated abstract] Generally hydrologic and ecologic models operate on arbitrary time and space scales, selected by the model developer or user based on the availability of field data. In reality rainfall is highly variable not only annually, seasonally and monthly but also the intensities within a rainfall event and infiltration properties on semi-arid hillslopes can also be highly variable as a result of discontinuous vegetation cover that form mosaics of areas with vegetation and areas of bare soil. This thesis is directed at improving our understanding of the impacts of the temporal repr

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14

Carver, Scott Stevenson. "Dryland salinity, mosquitoes, mammals and the ecology of Ross River virus." University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0100.

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[Truncated abstract] In an era of emerging and resurging infectious diseases, understanding the ecological processes that influence pathogen activity and the influences of anthropogenic change to those are critical. Ross River virus (RRV, Togoviridae: Alphavirus) is a mosquito-borne zoonosis occurring in Australia with a significant human disease burden. In the southwest of Western Australia (WA) RRV is principally vectored by Aedes camptorhynchus Thomson (Diptera: Culicidae), which is halophilic. The inland southwest, the Wheatbelt region, of WA is substantially affected by an anthropogenic s

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15

Malusa, James Rudolph. "The phylogeny and water relations of pinyon pines in relation to the vicariance biogeography of the American southwest." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/191149.

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Axelrod (1958) suggested that the late Tertiary shift in regional climate -- the elimination of summer rains -- had a profound influence on the evolution of biotic provinces in the American southwest. In particular, the taxa endemic to biotic provinces characterized by summer drought, e.g., the Mojave Desert, should be derived from ancestors that likely inhabited regions of summer rain, e.g., the Chihuahuan Desert. Further, the derived features of summer-drought taxa should be related to water stress. I examined Axelrod's thesis, using a combination of phylogenetic systematics, physiological e

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16

Haveron, Sara Elizabeth. "Comparing small mammal assemblages between communal and commercial rangelands within a region of the Succulent Karoo, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/2367.

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Thesis (MScConsEcol (Conservation Ecology and Entomology))--Stellenbosch University, 2008.<br>The widespread ecological impacts of overgrazing by livestock within the Succulent Karoo have received considerable attention. Literature shows communal and commercial rangelands have been thoroughly studied, and vegetation responses have been investigated in an attempt to understand the effects of overgrazing. Regarding animal species, literature is in short supply. In a one-year study of small mammal assemblages, the effect of the rangelands, and subsequently vegetation, on small mammal assemb

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Khalili, Davar 1955. "A decision methodology for the resource utilization of rangeland watersheds." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/191118.

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Degradation of rangeland resources leading to the desertification process is viewed in terms of human and climatic influences. While climatic impacts are important, resource utilization as practiced by man is the major cause of desertification. A multi-objective .decision methodology is developed here which is intended for the analysis of alternative management plans of rangeland watersheds under climatic variability. First, a system model is employed to portray the dynamics of a rangeland as it would respond to climatic changes and different grazing intensities. This approach allows for an in

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18

Murray, Francis J. "Potential for aquaculture in community-managed irrigation systems of the dry-zone, Sri Lanka : impacts on livelihoods of the poor." Thesis, University of Stirling, 2004. http://hdl.handle.net/1893/62.

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Rainfed areas in the Dry-Zone of Sri Lanka are characteristic of extensive marginal agro-ecosystems known as the semi-arid tropics (SAT) populated by poor farming communities. In the Dry-Zone and elsewhere, the traditional response to seasonal water scarcity was to construct rainfall-harvesting devices known as ‘tanks’; created by building earthen dykes across ephemeral streams in undulating terrain. Most are held in common ownership by adjacent communities, who use them for multiple functions including irrigation, bathing and fishing. Storage efficiency is enhanced by arranging tanks in casca

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19

Kraaij, Tineke. "Effects of rain, nitrogen, fire and grazing on bush encroachment in semi-arid savanna, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52817.

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Thesis (MScFor)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT: Increases in woody plant density ('bush encroachment') reduce livestock production and biodiversity. By convention, soil moisture, soil nutrients, fire and herbivory are regarded as the principal factors governing the tree-grass ratio of savannas. An experiment with a completely-crossed design was employed to investigate woody seedling (Acacia me/lifera) recruitment near Kimberley, Northern Cape, South Africa, after fire and under conditions of maximum-recorded rainfall, nitrogen addition and grazing. The field experiment

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20

Commander, Lucy. "Seed biology and rehabilitation in the arid zone : a study in the Shark Bay world heritage area, Western Australia." University of Western Australia. School of Plant Biology, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0091.

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Research into seed biology and restoration ecology of areas disturbed by mining is crucial to their revegetation. Shark Bay Salt, a solar salt facility in the Shark Bay World Heritage Area in Western Australia has several areas of disturbance as a result of 'soil borrowing'. Soil from these areas termed 'borrow pits' was used to create infrastructure such as the roads and embankments surrounding the evaporation ponds. Many of the pits contain little to no vegetation after >10 years since disturbance ceased, hence research into their restoration is now essential. A vegetation survey at the site

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21

Britz, Mari-Louise. "The effects of soil type and management strategy on vegetation structure and function in a semi-arid savanna, South Africa." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/53768.

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Thesis (MSc)--Stellenbosch University, 2004.<br>ENGLISH ABSTRACT: Bush encroachment in savannas leads to reduced diversity, productivity and profitability of rangelands. This holds important implications for the livestock and eco-tourism industries, as well as for subsistence ranchers in the South African semi-arid savannas, who depend on this vegetation type for economic and livelihood purposes. Soil moisture, nutrients, rue and herbivory are generally regarded as the principal factors determining vegetation structure and function within savannas. The factors and processes involved in t

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22

Deblauwe, Vincent. "Modulation des structures de végétation auto-organisées en milieu aride." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210121.

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À l’échelle macroscopique, à savoir celle du paysage, la couverture végétale des milieux arides apparaît comme fortement hétérogène. Cette organisation spatiale des peuplements est habituellement attribuée aux processus de facilitation et de compétition qui opèrent à l’échelle microscopique des individus végétaux. Le qualificatif d’auto-organisées fut donc attribué à ces végétations qui se structurent en l’absence d’hétérogénéité préexistante du milieu physique. <p><p>L’auto-organisation de la végétation fut particulièrement bien étudiée dans le cas des structures périodiques connues dès les a

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23

Thondhlana, Gladman. "Dryland conservation areas, indigenous people, livelihoods and natural resource values in South Africa: the case of Kgalagadi Transfrontier Park." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1011732.

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Contemporary conservation and development understanding in both policy and academic circles espouses that natural resources have a significant contribution to the livelihoods of local people and that knowledge of this can better foster conservation policies that are consistent with livelihood and ecological needs. This thesis is based on research conducted in the southern Kalahari region, South Africa among the San and Mier communities bordering Kgalagadi Transfrontier Park. It looks at the importance of natural resources to the San and Mier community groups and ascertains the extent of resour

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El-Mahi, Yousif A. "Aspects of vegetation resilience and change in relation to major environmental disturbances in the semi-arid parts of Kordofan region-Sudan." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6595/.

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The aim of this study has been to investigate the different responses of vegetation to the major environmental disturbances and discontinuities in Kordofan region of the Sudan. Data used have been obtained from fieldwork survey, aerial photographs and a landsat image in combination with existing maps and statistics on vegetation, climate, agriculture and population. Results obtained have shown that most plant species are neither randomly distributed nor indications of the postulated regularity of distribution were detected. Such a distributional pattern was explained through the pattern of sur

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25

Omer, Raja Muhammad. "The classification and efficiency of use of forage resources under semi-arid conditions in the Hindukush, Kakakoram and Himalayan region of Pakistan." Thesis, University of Aberdeen, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274871.

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The study was based on six villages along two sample transects, i.e. the Karakoram Highway (KKH) transect (good road and market infrastructure) and the Gilgit Ghizar Region (GGR) transect (poor road and market infrastructure). The primary objective was to examine if there were differences in pasture use due to infrastructure development. In each village, pastures were categorised into three broad vegetation types on the basis of altitude, i.e. foothill (<1500m), dry temperate (1500-3000m) and alpine (>3000m). Within each vegetation type pastures were selected for measuring vegetation by qua

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Giffin, Joy M. "Sediment production, storage, and transport processes studied in two semi-arid basins and in a recently burned region of the Mojave National Preserve." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1438923.

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27

Dunham, Natasha Robin. "Influence of hydrological and environmental conditions on mangrove vegetation at coastal and inland semi-arid areas of the Gascoyne region." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2014. https://ro.ecu.edu.au/theses/1406.

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Mangrove stands are uncommon within semi-arid climates and rare within inland systems. It is uncertain whether the same environmental variables influence mangroves growing in a semi-arid climate as the trees growing in tropical and sub-tropical areas. Field studies conducted on the ecophysiological responses of the mangrove species Avicennia marina are few; however hydrological regimes are considered the key factor influencing mangrove stand zonation, structure and individual tree growth. The Gascoyne region of Western Australia provides a unique opportunity to investigate whether mangroves gr

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Rocha, Francisco Cleiton da. "Reservoir in water quality in artificial semi-arid region from biological, physical and chemical attributes." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15394.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior<br>Os macroinvertebrados constituem um importante componente da biodiversidade dos ecossistemas aquÃticos e sÃo abundantes em rios, riachos, lagos e lagoas, servindo de alimento para peixes e crustÃceos. A utilizaÃÃo destes organismos na formulaÃÃo de Ãndices de Qualidade Ãgua (IQAâs) Ã amplamente aceita e adotada em muitas partes do mundo no monitoramento da qualidade da Ãgua. Os IQAâs visam apresentar de forma simples para a sociedade, instituiÃÃes pÃblicas e privadas i

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29

Nunes, Francyregis AraÃjo. "Efeitos da sazonalidade pluviomÃtrica sobre a diversidade e a composiÃÃo de uma assemblÃia de formigas (Hymenoptera: Formicidae) em uma Ãrea de caatinga." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6197.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>A presenÃa de Ãgua Ã um fator determinante na disponibilidade de fontes de alimento e/ou de sÃtios de nidificaÃÃo, e Ã, portanto, potencialmente importante para as comunidades de invertebrados terrestres, particularmente para animais com ninhos fixos/perenes e vivendo em ambientes marcados por uma forte sazonalidade pluviomÃtrica. O objetivo deste trabalho foi obter informaÃÃes sobre os padrÃes sazonais de estrutura de uma assemblÃia de formigas de solo da Caatinga e investigar como a diversidade e a composiÃÃo dessa assemblÃia var

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30

Ndhlovu, Thabisisani. "Impact of Prosopis (mesquite) invasion and clearing on ecosystem structure, function and agricultural productivity in semi-arid Nama Karoo rangeland, South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6751.

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Thesis (MScConEcol (Conservation Ecology and Entomology))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: I evaluated the impact of Prosopis invasion and clearing on ecological structure, function and agricultural productivity in heavily grazed Nama Karoo rangeland on two sheep farms near the town of Beaufort West in the Western Cape Province of South Africa. My aims were to (1) determine the effects of invasion and clearing on rangeland vegetation composition, diversity (alien and indigenous species richness) and structure (alien and indigenous species cover), soil vegetatio

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Hirakuri, Valter Levino. "A comunidade e dieta de pequenos mamíferos em uma área de caatinga no Alto Sertão Sergipano." Pós-Graduação em Ecologia e Conservação, 2013. https://ri.ufs.br/handle/riufs/4444.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Considering the habitat influence in the occurrence of animal species and feeding ecology as a key factor on community dynamics, the relationship between habitat components and species richness and the abundance of small mammals community were evaluated, as well as the diet characterization of these species at Caatinga‟s area in Sergipe, Brazil. The capture-mark-recapture (CMR) method was applied at the Grota do Angico Natural Monument (MNGA), 100 Sherman‟s® traps were arranged in four sites (dense hiperxerophytic Caatinga) from Ju

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32

Bowen, Anna Kate Miller. "Characterizing the Invasion of an Understory Grass Species (Oplismenus undulatifolius (Ard.) Roem. & Schult) in the Mid-Atlantic Region of the United States." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1595531995193925.

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Viana, Junior Arleu Barbosa. "Relação entre a diversidade de cupins e as alterações existentes em áreas de caatinga, Sergipe, Brasil." Pós-Graduação em Ecologia e Conservação, 2013. http://ri.ufs.br:8080/xmlui/handle/123456789/4401.

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Termites can be considered important indicators for ecological monitoring and analyses, mainly for the Caatinga. This study was aimed to examine how the richness, abundance and composition of termites respond to anthropogenic changes in three areas of Caatinga, remaining in the hinterland of Sergipe. The study was conducted in two districts of the State, Sergipe, where three areas, with different levels of disturbance were selected, namely: Area A1 - pasture; A2 - scrub shrub; A3 - arboreal Caatinga. Each area was separated in twelve transects of 65 x 2 m, and each transect consisted of five p

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Barbosa, José Etham de Lucena. "Dinâmica do fitoplâncton e condicionantes limnológicos nas escalas de tempo (nictemeral/sazonal) e de espaço (horizontal/vertical) no açude Traperoá II: trópico semi-árido nordestino." Universidade Federal de São Carlos, 2002. https://repositorio.ufscar.br/handle/ufscar/1545.

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Made available in DSpace on 2016-06-02T19:28:52Z (GMT). No. of bitstreams: 1 TeseJELB.pdf: 1718672 bytes, checksum: 2d711e25884ea18ec2a00592f22b4906 (MD5) Previous issue date: 2002-03-01<br>Financiadora de Estudos e Projetos<br>In the semi-arid North-east region of Brazil occurs the second highest density of dams in the world (or açudes , as they are locally known) which supply water to ca. 40 millions inhabitants, mainly during the dry period, a catastrophic and frequent event in that Brazilian region. The limnological functioning of such water system in the Taperoá II dam (07o11 44 S and

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Lins, Ruceline Paiva. "Limnologia da barragem de Acauã e codeterminantes socioeconômicos do seu entorno : uma nova interação do limnalogo com sua unidade de estudo." Universidade Federal da Paraíba, 2006. http://tede.biblioteca.ufpb.br:8080/handle/tede/4500.

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Made available in DSpace on 2015-05-07T14:49:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-01-23<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The main objective of this dissertation is to describe the limnological co-determinatives variations in temporal (monthly) and spatial (vertical/horizontal) scales of the Acauã reservoir by diagnosing its current trophic state. Monthly samples were collected and analyzed between August 2004 and July 2005. They were collected in six different regions of the reservoir in order to represent all of its compartm

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Yavari, Ahmad. "Allocation des ressources naturelles renouvelables et le développement rural dans les milieux montagnards de l'Iran : exemple de modalités du développement rural et la dégradation des ressources naturelles végétales de l'Alborz central." Grenoble 1, 1996. http://www.theses.fr/1996GRE10277.

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Ce travail est une etude en geographie appliquee concernant la gestion des espaces montagnards de pays arides et en voie de developpement ou les montagnes sont des repertoires et lieux de recharge de ressources naturelles et de l'heritage culturel. L'economie de la pluspart des villages de plaines et piedmonts reste dependante des ressources naturelles qui ont subit une degradation intense et de fortes perturbations ecologiques et socio-economiques. La region etudiee est une partie de la chaine d'alborz central choisie de facon a inclure la diversite naturelle et socio-economique de l'espace m

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FERREIRA, Karla Patrícia Martins. "A formação de sentido e o sentido da vida: o círculo ecobiográfico com educadores e as experiências afetivas formadoras em sua relação com o semiárido cearense." http://www.teses.ufc.br, 2011. http://www.repositorio.ufc.br/handle/riufc/3357.

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FERREIRA, Karla Patrícia Martins. A formação de sentido e o sentido da vida: o círculo ecobiográfico com educadores e as experiências afetivas formadoras em sua relação com o semiárido cearense. 2011. 190f. Tese (Doutorado em Educação) – Universidade Federal do Ceará, Faculdade de Educação, Programa de Pós-Graduação em Educação Brasileira, Fortaleza-CE, 2011.<br>Submitted by Raul Oliveira (raulcmo@hotmail.com) on 2012-07-05T13:09:30Z No. of bitstreams: 1 2011_Tese_KPMFerreira.pdf: 2083329 bytes, checksum: 840bb3a598de603f1c041e98a0f77696 (MD5)<br>Approved for entry into archive by Maria Josine

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Venter, Daniel Barend. "An ecological approach to the reclamation and improvement of arid rangelands using adapted fodder plants." Diss., 2006. http://hdl.handle.net/2263/23495.

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The world we live in is changing rapidly. Ecological, economic and social aspects and understandings are all undergoing paradigm shifts. Communities, farmers and individuals in arid zones are experiencing climate changes, more so than city dwellers. A better understanding of the current thinking in range ecology and management, especially of arid environments, is critical to the management of these delicate, complex systems. Ecosystems in equilibrium or in disequilibrium react differently to management and reclamation efforts. An understanding of the basic principles and how they evolved is im

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Henle, Klaus. "Population ecology and life history of a lizard community in arid Australia." Phd thesis, 1988. http://hdl.handle.net/1885/140211.

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Khalili, Davar. "A decision methodology for the resource utilization of rangeland watersheds." 1986. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1986_585_sip1_w.pdf&type=application/pdf.

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Prider, Jane (Jane Noeleen). "Resource dynamics and positive and negative interactions between plants in arid systems / Jane Prider." Thesis, 2002. http://hdl.handle.net/2440/21845.

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"June 2002"<br>Bibliography: leaves 172-198.<br>viii, 198 leaves : ill. ; 30 cm.<br>Proposes that the overall outcome of plant interactions along a temporal gradient of resource availability changes from positive during interpulses to negative during pulses. Examines negative interactions between 4 co-dominant chenopod scrubs in arid Acacia papyrocarpa woodlands. Negative interactions were more intense when conditions were least productive. Positive interactions between seedlings also changed over time, depending on the facilitation mechanism. Plant interactions seem to be most intense at the

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Prider, Jane (Jane Noeleen). "Resource dynamics and positive and negative interactions between plants in arid systems / Jane Prider." 2002. http://hdl.handle.net/2440/21845.

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"June 2002"<br>Bibliography: leaves 172-198.<br>viii, 198 leaves : ill. ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Proposes that the overall outcome of plant interactions along a temporal gradient of resource availability changes from positive during interpulses to negative during pulses. Examines negative interactions between 4 co-dominant chenopod scrubs in arid Acacia papyrocarpa woodlands. Negative interactions were more intense when conditions were least productive. Positive interactions between seedli

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McGee, P. A. (Peter Allan). "Role of mycorrhizas in the regeneration of arid zone plants." 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phm1448.pdf.

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McGee, P. A. (Peter Allan). "Role of mycorrhizas in the regeneration of arid zone plants / by Peter Allan McGee." Thesis, 1987. http://hdl.handle.net/2440/18542.

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Bogan, Michael T. "Drought, dispersal, and community dynamics in arid-land streams." Thesis, 2012. http://hdl.handle.net/1957/31292.

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Understanding the mechanisms that regulate local species diversity and community structure is a perennial goal of ecology. Local community structure can be viewed as the result of numerous local and regional processes; these processes act as filters that reduce the regional species pool down to the observed local community. In stream ecosystems, the natural flow regime (including the timing, magnitude, and duration of high and low flow events) is widely recognized as a primary regulator of local diversity and community composition. This is especially true in aridland streams, where low- and ze

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Clarke, Sylvia G. "The biodiversity impacts of shrub loss in a semi-arid environment : responses of arthropods with particular reference to ants." Thesis, 2006. http://hdl.handle.net/2440/70158.

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Environmental stress resulting from factors such as over grazing can have far-reaching effects on an ecosystem. This thesis aimed to increase the understanding of the wider biodiversity impact of stress and disturbance in semi-arid systems. The response of the arthropod community, and in particular the ant community, to changes in vegetation associated with over grazing, including the loss of perennial shrubs, was examined in the Flinders Ranges region of South Australia.<br>Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2006

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Koch, Kathryn Jane. "Modelling the spatial dynamics of a semi-arid grazing system." Thesis, 1999. http://hdl.handle.net/10413/6305.

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A large proportion of the world's land surface is covered by semi-arid grasslands, and they provide an important source of income as a grazing resource. A more comprehensive understanding of these complex ecosystems is vital for the effective management of rangelands, as it will lead to an increased and more sustainable economic output. Herbivores modify the spatial pattern of vegetation distribution and their response to spatially heterogeneous forage resources affects their performance. The spatial aspect of herbivory is often ignored although it is a necessary component of understanding gra

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"Seasonality and Ecosystem Response in Prehistoric Agricultural Regions of Central Arizona." Master's thesis, 2011. http://hdl.handle.net/2286/R.I.8859.

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abstract: This thesis explores the independent effects of the manipulation of rocks into alignments, prehistoric farming, and season on soil properties in two areas with a history of prehistoric agriculture in central Arizona, Pueblo la Plata within the Agua Fria National Monument (AFNM), and an archaeological site north of the Phoenix basin along Cave Creek (CC). Soil properties, annual herbaceous biomass and the physical properties of alignments and surface soils were measured and compared across the landscape, specifically on: 1) agricultural rock alignments that were near the archaeologica

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Loehr, Victor J. T. "The ecology of the world's smallest tortoise, Homopus signatus signatus: effects of rainfall." Thesis, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3016_1259833196.

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<p>Tortoises appear to be successful in arid ecosystems, where they depend on primary production for their predominantly herbivorous diets. The low primary production of arid regions is exacerbated by priodic droughts, so that iteroparous species such as chelonians require mechanisms to overcome resource shortages. The smallest of all tortoises, Homopus signatus signatus, occurs in a dry winter rainfall area in northwestern South Africa that is threatened with aridification due to regional climate change. The overall aim of this study is to understand the ecology of H. s. signatus, particularl

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Chipfupa, Lukas. "The effects of weather variability on growth potential of Afrikaner cattle in a semi-arid region in Zimbabwe." Diss., 2012. http://hdl.handle.net/10500/10198.

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Only part of the abstract could be included due to the rest having renderable text<br>The abiotic environment plays an important role in cattle production. Key abiotic elements evaluated in this study are rainfall and temperature. This study was carried out to assess the effect and contribution of rainfall and temperature, amid other factors, on pre- and post-weaning growth traits of Afrikaner cattle at Matopos Research Institute from 1958 to 1997. Historical data generated from a genotype x environment interaction study at Matopos Research Institute was used to identify factors associated wi

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