Tesis sobre el tema "Remnant vegetation"
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Adams, Graham R. "The management of remnant native vegetation in heritage agreement areas /". Title page, table of contents and abstract only, 1991. http://web4.library.adelaide.edu.au/theses/09ENV/09enva213.pdf.
Texto completoHowe, Chris. "Ground-dwelling vertebrate communities in remnant vegetation within Bluegum plantations". Thesis, Howe, Chris (2008) Ground-dwelling vertebrate communities in remnant vegetation within Bluegum plantations. Honours thesis, Murdoch University, 2008. https://researchrepository.murdoch.edu.au/id/eprint/32596/.
Texto completoVan, der Ree Rodney y mikewood@deakin edu au. "Ecology of arboreal marsupials in a network of remnant linear habitats". Deakin University. School of Ecology and Environment, 2000. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050804.104814.
Texto completoMiramontes, Loyd Lydia. "Fragmentation effects on fitness in five common prairie species /". View online, 2009. http://repository.eiu.edu/theses/docs/32211131591861.pdf.
Texto completoHodgson, Patricia Ruth. "Characteristics of urbanization that influence bird communities in suburban remnant vegetation". Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060724.134345/index.html.
Texto completoSparrow, Ashley. "A geobotanical study of the remnant natural vegetation of temperate South Australia". Title page, contents and summary only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phs7368.pdf.
Texto completoKeeton, William Scott. "Occurrence and reproductive role of remnant old-growth trees in mature Douglas-fir forests, southern Washington, Cascade Range /". Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/5479.
Texto completoBrown, Angela M. "Ground dwelling beetle assemblages of remnant and created prairies of east-central Indiana". Virtual Press, 2004. http://liblink.bsu.edu/uhtbin/catkey/1293518.
Texto completoDepartment of Biology
Fischer, Joern. "Beyond fragmentation : lizard distribution patterns in two production landscapes and their implications for conceptual landscape models /". View thesis entry in Australian Digital Theses Program, 2004. http://thesis.anu.edu.au/public/adt-ANU20060718.150101/index.html.
Texto completoGilbert, Cynthia. "Aspects of community ecology, population growth and genetic structure applied to the conservation of Polemonium pectinatum (Polemoniaceae), a rare and threatened shrub-steppe perennial /". Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5535.
Texto completoWeld, Mary-Jane. "Landscape planning for rural nature conservation : maintenance of remnant vegetation and sustainable agriculture in the brigalow belt of Central Queensland". Thesis, Queensland University of Technology, 1994.
Buscar texto completoBickford, Sophia Anastasia. "A historical perspective on recent landscape transformation: integrating palaeoecological, documentary and contemporary evidence for former vegetation patterns and dynamics in the Fleurieu Peninsula, South Australia". Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phb583.pdf.
Texto completoLaubscher, Charles Petrus. "An eco-tourism and conservation perspective of endangered Proteaceae of the Cape Floral Kingdom on the Agulhas Plain". Thesis, [S.l. : s.n.], 2009. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1065&context=td_cput.
Texto completoKriticos, Darren John. "Landscape ecology and the management of remnant native vegetation : a case study in the Murray Mallee using a geographical information system /". Title page, table of contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09ENV/09envk92.pdf.
Texto completoTreweek, Allison y n/a. "Wood, money and habitat to burn: environmental issues and the role of the educator". University of Canberra. Resource, Environmental & Heritage Sciences, 2002. http://erl.canberra.edu.au./public/adt-AUC20060427.114839.
Texto completoJay, Grace Mairi McIntyre. "Symbolic order and material agency a cultural ecology of native forest remnants on Waikato dairy farms /". Connect to this title online, 2004. http://adt.waikato.ac.nz/public/adt-uow20060125.120921/.
Texto completoSiderov, Kris y kris siderov@rmit edu au. "An investigation of the invasion dynamics of Asparagus asparagoides at the habitat level using spatial analytical techniques". RMIT University. Mathematical and Geospatial Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061010.095929.
Texto completoHausmann, Franziska y n/a. "The Utility of Linear Riparian Rainforest for Vertebrates on the Atherton and Evelyn Tablelands, North Queensland". Griffith University. Australian School of Environmental Studies, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050115.105740.
Texto completoMidoko-Iponga, Donald. "Renosterveld restoration : the role of competition, herbivory and other disturbances". Thesis, Stellenbosch : University of Stellenbosch, 2004. http://hdl.handle.net/10019.1/16390.
Texto completoENGLISH ABSTRACT: West Coast Renosterveld is one of the most threatened vegetation types in South Africa. Less than 5% of the original extent of this vegetation type remains, of which 80% is on private land. In addition to fragmentation, much of the vegetation has been ploughed for crop production and then abandoned and invaded by alien plants. Restoration of transformed areas may improve the conservation status of this vegetation type. Indigenous species do not return to abandoned agricultural fields for decades even if these are adjacent to natural areas since their return is limited either by seed dispersal or seedling establishment. The aim of this study was to examine the recovery of indigenous vegetation on abandoned fields. Renosterveld, as we know it today, is an asteraceous shrubland, dominated mainly by renosterbos (Eytropappus rhinocerotis), but might have been a grassland or a grassland-shrubland mosaic. Historical records indicate that species of large game were common in the Western Cape when the early settlers arrived, but most of these have since disappeared. It is thus impossible to reconstruct exactly the ecological processes and functioning of Renosterveld. The first part of the study was designed to examine the effects of grass competition, grazing by indigenous large herbivores, and interaction of these two factors on the establishment, growth and survival of transplanted Renosterveld seedlings on an abandoned agricultural field. Experimental transplanting of indigenous shrubs into an old field showed that most of the plants investigated competed for resources with lawn grasses on the field, and competition affected the seedlings throughout the experiment. Mortality was higher, and growth was reduced for seedlings exposed to grass competition. With the exception of wild olive (Olea europaea spp.africana), herbivory alone had no significant impact on the target species. Herbivory was at a low intensity (20 ha/large animal unit); higher grazing pressures might have given different results. No interaction between competition and herbivory was found for the species investigated; competition and grazing therefore seem to influence the seedlings independently. The second part of this study was conducted to examine the effects of different management strategies, viz: brush cutting, burning and herbicide application on plant species recruitment and community composition and to ascertain their applicability by farmers for large scale restoration of Renosterveld. My comparison of the different strategies for controlling annual alien grasses indicated that these did not differ significantly in their effects on species richness. Burning reduced shrub cover and increased overall species richness and diversity. Burning also reduced grass biomass, and increased recruitment of indigenous seedlings. The use of herbicide resolved the problem of grass biomass invasion and increased shrub species richness. The herbicide application did not appear to have long-term negative effects on the soil quality. Brush cutting did not remove grass biomass on the old field. Experimental re-seeding with an indigenous grass and shrub species into treated plots resulted in low recruitment. My conclusion is that grass can reduce recruitment and growth of many indigenous shrub species. My recommendation for the restoration of old fields in West Coast Renosterveld is to apply herbicide to remove grass competition, and then, after the herbicide has degraded, to oversow the field with seeds of indigenous shrub and grass species of early successional stages to increase overall species diversity.
AFRIKAANSE OPSOMMING: Weskus Renosterveld is een van die mees bedreigde plantegroei soorte in Suid Afrika. Minder as 5% van die oorspronklike omvang van hierdie plantegroei tipe is oor, en dit hoofsaaklik (80%) op privaatlande. Saam met fragmentasie, is baie Renosterveld areas ook omgeploeg vir boerdery en dan net so gelos, met die gevolg dat uitheemse plante hierdie areas ingedring het. Restorasie of herstelling van sulke bewerkte lande kan dalk die bewaringsstatus van hierdie plantegroei tipe verbeter. Natuurlike vestiging van Renosterveld spesies op sulke ou bewerkte lande gebeur nie, selfs al is daar Renosterveld direk langs so ‘n ou veld. Die hervestiging van inheemse spesies is dus tot saadverspreiding or saailingbevestiging beperk. Die doel van hierdie studie is om die stadige terugkoms van inheemse plantegroei na verlate bewerkte velde te verduidelik. Renosterveld is ‘n struikveld waarin die renosterbos (Eytropappus rhinocerotis) domineer, maar kan ook ‘n grasveld of ‘n grasveld-struikland mengsel wees. Groot herbivore was algemeen in die Wes Kaap toe die eerste settelaars gearriveer het, maar intussen het omtrent al die groot wild spesies verdwyn. Dit is dus ontmoontlik om die ekologiese prosesse en funksionering van Renosterveld presies so te herstel. Die eerste deel van hierdie studie bestudeer die effek van graskompetisie, weiding deur inheemse groot herbivore, en die interaksie tussen hierdie twee faktore op die vestiging, groei en oorlewing van oorgeplante Renosterveld saailinge in ‘n verlate ou veld. Die eksperimentele oorplanting van inheemse struike in ‘n ou land het gewys dat die meeste van hierdie plante kompeteer vir hulpbronne met kweekgras wat op die ou veld groei. Kompetisie het die saailinge deur die hele eksperiment geaffekteer. ‘n Hoër mortaliteit en verminderede groei in saailinge wat aan gras kompetisie blootgestel was, is waargeneem. Met die uitsondering van Olea europaea spp. africana, het herbivorie alleen geen betekenisvolle impak op plant spesies gehad nie. Weidingsdruk was laag (20 ha/groot vee eenheid); ‘n groter weidingsdruk sou miskien ‘n ander uitkoms gehad het. Geen interaksie tussen kompetisie en herbivorie is waargeneem in die bestudeerde plantspesies nie. Dit wil dus voorkom of kompetisie en weiding die saailinge onafhanklik van mekaar beïnvloed. Die tweede deel van hierdie studie was onderneem om die effek van verskillende behandelings (kontrole, sny, brand en herbisied toediening) op plantspesie vestiging en samestelling te bestudeer asook om bestuurmetodes te toets was deur boere op groot skaal gebruik kan word om Renosterveld te herstel. In ‘n vergelyking van verskillende bestuur metodes (kontrole, besnoeiing, brand en herbisied) om eenjarige uitheemse gras te beheer, is gewys dat die behandlings nie betekenisvol van mekaar verskil in hulle effek op spesierykheid nie. Vuur het struikbedekking verminder en totale spesies rykheid en diversitiet verhoog. Die gebruik van ‘n herbisied het die probleem van grasindringing opgelos en het ook struikspesiesrykheid verhoog. Die herbisied het nie lang termyn negatiewe effekte op grond kwaliteit gehad nie. Sny het nie gras biomassa verlaag op die ou land nie. Eksperimentele plant van inheemse grasse en struike in die behandelde areas, het lae vestiging tot gevolg gehad. My algemene afleiding is dus dat gras die hervestinging en groei van baie inheemse struikspesies verminder. Ek stel voor dat herbisied gebruik moet word om gras kompetisie te verminder. Nadat herbisied residue in die grond afgebreek is, moet die ou land met inheemse struik en grasspesies, wat in vroeë suksessie stadiums is, beplant word om sodoende totale spesiediversiteit te verhoog en uiteindelik ou bewerkte lande in Weskus Renosterveld te herstel.
Walton, Benjamin Alan. "Vegetation patterns and dynamics of Renosterveld at Agter-Groeneberg Conservancy, Western Cape, South Africa". Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2806.
Texto completoSwartland Shale Renosterveld is restricted to fertile fine-grained soils in the winter rainfall region of the Western Cape. Between 91% and 97% of this vegetation type is transformed, mostly due to agriculture. Remaining fragments have an irreplaceable conservation value due to a high richness of endemic geophytes. Information on renosterveld vegetation composition and response to disturbance is sparse. Research occurred at three sites near Wellington: Voëlvlei Provincial Nature Reserve (CapeNature), Elandsberg Private Nature Reserve (Elandsberg Farms (Pty.) Ltd.), and Krantzkop munitions factory (Armscor/Somchem) forming a contiguous fragment in the Agter- Groeneberg Conservancy. The primary research aim was to identify or ascertain patterns of plant succession in Swartland Shale Renosterveld and associated different-aged old fields (previously ploughed), with the interaction of grazing. The key research questions are: (1) What are the plant communities of unploughed renosterveld and different-aged old fields which originated in habitats of ploughed renosterveld? (2) What are the most characteristic features of the floristic and ecological relationship between the described plant communities in terms of ecological factors operating within the studied system? (3) Does total species and life-form group richness differ between natural vegetation and old fields? (4) Is life-form richness influenced by ploughing and grazing or the interaction between these disturbances? (5) Is life-form cover-abundance influenced by ploughing and grazing or the interaction between these disturbances? (6) Does alien plant species richness differ amongst seres, and with different levels of grazing intensity? A comparison of life-form richness and cover-abundance of old field vegetation was made with adjacent natural unploughed “controls”. The effects of ploughing on community structure, with the inclusion of grazing was established. These life-form richness comparisons also occur across a gradient of increasing large mammalian herbivore grazing intensity. Sampling was conducted in winter and spring using nested 1000m2 relevés. A hierarchical classification, description and floristic interpretation of renosterveld and old field vegetation were made using TWINSPAN, SYN-TAX 2000 and CANOCO. The samples were classified with TWINSPAN and two communities were described at the association level, namely: Ursinia anthemoides–Cynodon dactylon Grassland Community (with two variants) and the Pterygodio catholici–Elytropappetum rhinocerotis Shrubland Community (with two subassociations), respectively. The vegetation data were further hierachically classified using SYNTAX 2000 which revealed similar clustering of sample objects to that resulting from classification and ordination. Following ordination of sample objects with CANOCO, select groups of species were used to depict their response curves in relation to seral development. Briefly it was found that the effects of grazing vs. non-grazing was more pronounced on old fields than in unploughed vegetation. Overall total species and life-form richness was reduced by ploughing with old fields requiring a recovery period of 30 years to resemble unploughed vegetation. Keywords: Swartland Shale Renosterveld, phytosociology, vegetation patterns, life-forms, succession, disturbance, ploughing, grazing, old fields.
Shiponeni, Ndafuda Nangula. "Dispersal of seeds as a constraint in revegetation of old fields in Renosterveld vegetation in the Western Cape, South Africa". Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53396.
Texto completoENGLISH ABSTRACT: Species-rich Renosterveld vegetation does not return to old agricultural fields even after many years (10-20) of abandonment. In most cases the fields are slowly taken over by non-indigenous species, particularly alien pasture grasses and African lawn grass. While poor survival of indigenous seedlings due to competition, grazing or any other establishment constraints, might explain the failure of natural vegetation to colonise old fields, here I am testing the hypothesis that recolonisation by indigenous plant species is limited by seed dispersal. I have quantified changes in seed density with distance from the natural vegetation into old fields using seed traps and soil seed bank assessment. I have also looked at seed dispersal in the dung of large herbivores. Shrubs (with the exception of Eytropappus rhinocerotis) were poorly represented in the seed rain indicating that they might be seed limited. Dicerothamnus rinocerotis (a dominant shrub in Renosterveld) and certain geophytes (that were recovered in the soil bank) have proven that seed dispersal is not the primary constraint to their return to ploughed fields. Dicerothamnus rinocerotis produces a large number of seeds that are dispersed long distances into the old field and a number of geophytes were well represented in the soil bank. Large herbivores are dispersing a lot of herbaceous forbs in their dung but make very little contribution to the dispersal of indigenous tussock grass and shrubs. Seeds of indigenous Renosterveld tussock grasses (e.g Tribolium hispidum) were restricted to the edge of the natural vegetation. My research has shown that some indigenous seeds, particularly those dispersed in wind and through large mammals, do reach the old ploughed field. I therefore conclude that seed dispersal is not the primary constraint to the natural recovery of populations of some indigenous plant species on old fields, but may limit recovery of certain indigenous geophytes, grasses and shrubs.
AFRIKAANSE OPSOMMING: Spesie-ryke Renosterveld plantegroei hervestig nie op ou landerye nie, selfs ná baie jare (l0-20) van verlating. Oor die algemeen word hierdie grond stadig oorgeneem deur uitheemse spesies, veral uitheemse weidingsgrasse en kweekgras. Terwyl swak oorlewing van inheemse saailinge as gevolg van kompetisie, weiding of enige ander vestigingsbeperkinge, die mislukte vestiging van natuurlike plantegroei op ou benutte grond kan verduidelik, toets ek hier die hipotese dat hervestiging deur inheemse plantspesies deur saadverspreiding beperk word. Ek het veranderinge in saaddigtheid oor afstand vanaf die natuurlike plantegroei na ou landerye gekwantifiseer, deur gebruik te maak van saadopvangsvalle en sand saadbank beraminge. Ek het ook gekyk na saadverspreiding in die mis van groot herbivore. Struike (behalwe Eytropappus rhinocerotis) was swak verteenwoordig in die "saadreën", wat mag toon dat struike saadbeperk is. Eytropappus rhinocerotis ('n dominante struik in Renosterveld) en sekere geofiete (wat in die saadbank gevind is) het bewys dat saadverspreiding nie die hoofbeperking is vir hulle terugkeer na geploegde lande nie. Eytropappus rhinocerotis produseer 'n groot hoeveelheid saad wat oor groot afstande oor die ou landerye versprei word en 'n aantal geofiete was goed verteenwoordig in die saadbank. Groot herbivore versprei 'n groot hoeveelheid kruidagtige forbe in hulle mis, maar maak 'n baie klein bydrae tot die verspreiding van inheemse polgras en struike. Saad van inheemse Renosterveld polgrasse (bv. Tribolium hispidum) was beperk tot die some van die natuurlike plantegroei. My navorsing het getoon dat sommige inheemse saad, veral dié wat deur die wind en deur groot herbivore versprei word, wel die ou geploegde landerye bereik. Ek maak dus die gevolgtrekking dat saadverspreiding nie die hoofbeperking is vir die natuurlike herstel van populasies van sommige inheemse plantspesies op ou landerye nie, maar mag die herstel van sekere inheemse geofiete, grasse en struike beperk.
Oppermann, Alison. "Introduced plant invasion in small remnants of native vegetation /". Title page, contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09ENV/09envo62.pdf.
Texto completoHausmann, Franziska. "The Utility of Linear Riparian Rainforest for Vertebrates on the Atherton and Evelyn Tablelands, North Queensland". Thesis, Griffith University, 2004. http://hdl.handle.net/10072/365964.
Texto completoThesis (Masters)
Master of Philosophy (MPhil)
Australian School of Environmental Studies
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Craig, Jill E. y Scott R. Abella. "Vegetation of Grassy Remnants in the Las Vegas Valley, Southern Nevada". University of Arizona (Tucson, AZ), 2008. http://hdl.handle.net/10150/555934.
Texto completoBen, Kahn Ali. "Management planning for small multiple-use remnants of native vegetation : a case study of Douglas Scrub /". Title page, table of contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09ENV/09envk12.pdf.
Texto completoBoonzaaier, Carmen. "Conservation in human-influenced areas : epigaeic arthropods in the Cape Floristic Region Lowlands". Thesis, Stellenbosch : Stellenbosch University, 2006. http://hdl.handle.net/10019.1/21551.
Texto completoENGLISH ABSTRACT: The conservation of biodiversity is becoming increasingly challenging as habitats are disturbed, fragmented or destroyed. Although nature reserves now cover more than 10 % of the earths’ surface it has become clear that more will have to be done to ensure the long-term survival of species. Therefore, focus is increasingly shifting towards conserving biodiversity in natural and semi-natural remnants in human-influenced areas. This study aimed to determine the contribution of remnants in human-influenced areas to the conservation of biodiversity in the Cape Floristic Region (CFR) lowlands, using ground-dwelling arthropods, specifically ants, as the focal taxon. Initially, base-line information of arthropods and in particular ants was obtained. Sampling arthropods generally involves a large sample effort. Therefore maximizing sampling effort for ants in the CFR was investigated by trapping ground-dwelling ants at a single locality. Doubling the number of grids of pitfall traps was found to be more effective in trapping a greater number of species than doubling the duration of sampling. Therefore increasing spatial sampling intensity rather than sampling duration maximizes sample effort for CFR ants. Also, the seasonal changes of ground-dwelling arthropods, including ants, were determined by sampling four times during the year at a single locality. Overall arthropod abundance was found to peak in summer while dropping to a minimum in winter. This pattern was mirrored by that of the ants, indicating that ant results have a broader relevance than to ants only. The ground-dwelling fauna was dominated by ants emphasizing their importance in the CFR lowlands, and demonstrating that ants are an appropriate flagship taxon for epigaeic arthropod diversity in the CFR. Finally the contribution of remnants in human-influenced areas to the conservation of the CFR was investigated. A nested hierarchical approach was used, where five localities were selected across the CFR, each containing one reserve site and one site with natural remnants. Ants were sampled, along with environmental variables, namely weather, vegetation and soil. Overall, remnants were found to support similar ant assemblages to those of reserves. However for individual localities some remnants were significantly different to their reserve counterparts. Differences in ant assemblages were found to be greater between localities than between reserves and remnants. The relatively high heterogeneity of ants found in this study emphasizes the conservation significance of invertebrates along with that of plants in the CFR. Remnants clearly show the potential to conserve ant assemblages, however correct management is needed for these areas to maximize their potential. Disturbances such as the presence of the invasive Argentine ant and increasing soil nutrients by fertilization, pose a distinct threat to the ability of remnants to conserve ant assemblages. This study has shown that remnants currently support ant assemblages representative of those present in the CFR today. Therefore, some remnant patches of habitat in agricultural areas currently do contribute highly to the conservation of a functional important taxon in this global biodiversity hotspot, and if managed correctly, may continue to do so in the future.
AFRIKAANSE OPSOMMING: Die vernietiging en fragmentering van habitatte maak die bewaring van biodiversiteit al hoe meer van ‘n uitdaging. Alhoewel natuur reservate reeds meer as 10 % van die aarde se oppervlak beslaan is dit duidelik dat meer gedoen sal moet word vir die lang-termyn voortbestaan van spesies. Dus word die fokus van biodiversiteit-bewaring toenemend gerig op bewaring van natuurlike en semi-natuurlike fragmente in menslik-beinvloede gebiede. Die doel van hierdie studie was om te bepaal wat die bydrae van fragmente van natuurlike veld in menslik-beinvloede gebiede is tot die bewaring van die streek. Dit is gedoen deur van grond-lewende geleedpotiges en spesifiek, miere in die Kaapse floraryk (CFR) gebruik te maak. Aanvanklik is kennis ingewin oor die geleedpotiges en spesifiek miere in die omgewing. Omdat die versameling van geleedpotige diere gewoonlik baie moeite vereis is ‘n maksimum steekproef gedoen by ‘n enkele lokaliteit. Daar is gevind dat ‘n verdubbling van die aantal ruitsteekproefnemings met vanggate meer effektief is om miere te vang as ‘n verdubbling in die tydperiode wat vanggate oop is. Dus, is ‘n hoër ruimtelike steekproef intensiteit meer effektief in vergelyking met ‘n langer tydsduur vir miere in die CFR. Die seisoenale veranderinge van grond-lewende geleedpotiges, sowel as miere, was ook bepaal. Dit was gedoen deur vier seisoenale steekproewe te doen by ‘n enkele lokaliteit. Die totale geleedpotige-talrykheid was die meeste gedurende die somer en die minste in die winter. Die miertalrykheid het ook hierdie patroon weerspieël. Dit dui daarop dat veranderinge in mier versamelings van breër belang is vir alle grondlewende geleedpotiges. Miere was die dominante grond-lewende geleedpotiges en beklemtoon die belangrikheid van miere in die CFR, sowel as hulle toepaslikheid as vlagskip taksa vir grond-lewende geleedpotige diversiteit in die CFR. Laastens was die bydrae van gefragmenteerde natuurlike veld in menslik–beinvloede gebiede tot die bewaring van die CFR ondersoek. ’n Krimpende/ genestelde hiërargies benadering is gebruik in vyf geselekteerde lokaliteite, elk het bestaan uit ‘n area in ‘n natuur reservaat en ‘n area in ‘n naasliggende fragment. Miere was versamel saam met ‘n verskeidenheid omgewings veranderlike, naamlik weer, plantegroei en grond. In die algemeen is gevind dat fragmente en reservate gelyksoortige mier versamelings het. Daar was wel gevind dat party fragmente aansienlik verskillend was van die reservaat teenstuk. Verskille in mier versamelings tussen lokaliteite was groter as verskille tussen reservate en fragmente. Die relatief hoë heterogeniteit van miere beklemtoon die bewaringsbelang van invertebrate saam met dié van plante in die CFR. Dit is duidelik dat fragmente wel ‘n potensiale bydrae kan maak om die mier versamelinge te bewaar, maar gepaste bestuur is nodig om hierdie potentiaal te maksimaliseer. Versteurings soos die teenwoordigheid van die indringer Argentynse mier en toenemende grondvoedingstofkonsentrasie as gevolg van bemesting is ‘n groot bedreiging tot die vermoë van fragmente om mier versamelings te bewaar. Hierdie studie wys dat mier versamelings in gefragmenterde areas verteenwordigend is van die algemene mier versamlings wat op die oomblik in die CFR is. Dus lewer party fragmente in landbou gebiede op die oomblik ‘n wesenlike bydrae tot die bewaring van ‘n funksioneel belangrike takson in hierdie globale biodiversiteitsbrandpunt en die bydra sal volhoubaar wees met korekte bestuur.
Jay, Grace Mairi M. "Symbolic order and material agency: A cultural ecology of native forest remnants on Waikato dairy farms". The University of Waikato, 2004. http://hdl.handle.net/10289/2603.
Texto completoXu, Fang [Verfasser]. "Land-cover change and the distribution pattern of natural and semi-natural alluvial vegetation remnants along the Upper Danube River / Fang Xu". Gießen : Universitätsbibliothek, 2019. http://d-nb.info/1189066041/34.
Texto completoEchols, Stephen Lee. "Vascular flora of the remnant Blackland prairies and associated vegetation of Georgia". 2007. http://purl.galileo.usg.edu/uga%5Fetd/echols%5Fstephen%5Fl%5F200708%5Fms.
Texto completoMahiny, Abdolrassoul Salman. "A modelling approach to cumulative effects assessment for rehabilitation of remnant vegetation". Phd thesis, 2004. http://hdl.handle.net/1885/150829.
Texto completoHuang, Jheng-Yu y 黃正宇. "Remnant Trees and Surrounding Vegetation Influence Avian Frugivores Visitation in Forest Restored Sites in Taiwan". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/36050543617215723886.
Texto completo國立臺灣大學
森林環境暨資源學研究所
102
Human exploitation is the major threat to forests worldwide, which resulted in severe forest loss and degradation and compelling need of forest restoration. Due to the limitation of planting seedlings, effective forest restoration strategy should combine both human planting and accelerating natural recovery. The visitation of avian frugivores to a site is thought to be positively correlated with seed rain. Therefore, more visits of avian frugivore to restored site should increase input of seed rain, which promotes forest restoration. In this study, I monitored avian frugivore visitation in 30 forest restored sites within Experimental Forest of National Taiwan University in Nantou. As my results, avian frugivore species richness was positively related with tree species diversity. Avian frugivore visitation rate was positively related with tree species diversity and foliage volume of remnant trees, and negatively related with conifer plantation coverage in surrounding landscape. However, the effect of remnant trees differed as landscape structure changed. In area dominated by conifer plantations, the effect of remnant tree was limited, and few frugivore species appeared in the restored sites. Some Frugivore species showed different habitat associations in restored sites. Black Bulbul (Hypsipetes leucocephalus) and White-eared Sibia (Heterophasia auricularis) were relatively general in different restored sites. Entering ratio of avian frugivore differed among species and seasons. Shrub-dwelling frugivore species rarely entered restored sites. However, tree frugivore species entered restored sites more often except Taiwan barbet (Megalaima nuchali), and their entering ratios increased dramatically during the non-breeding season. My results suggest more diverse and dense structure of remnant tree is more effective on attracting avian frugivores to restored sites. However, for restored sites within conifer plantations, remnant trees would become less effective and more human efforts are needed to promote forest recovery. Black bulbul and White-eared Sibia are important seed dispersers in restored sites, and some frugivore specie would enter more frequently during non-breeding season, which may result in higher abundance of seed rain.
Knauer, Kim. "Monitoring ecosystem health of Fynbos remnant vegetation in the City of Cape Town using remote sensing". Master's thesis, 2011. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-92495.
Texto completoZunehmende Urbanisierung stellt eine der größten Bedrohungen für die Vegetation im Großraum Kapstadt dar. Durch das schnelle Wachstum der Stadt bleibt immer weniger der ursprünglichen Vegetation in isolierten Fragmenten zurück. Diese sind in ihrer Funktion als Lebensraum für Flora und Fauna unter Anderem durch Luftverschmutzung, untypische Feuerzyklen und das Eindringen fremder Arten gefährdet. Besonders die Weidenblatt-Akazie (Acacia Saligna) verdrängt die einheimische Fynbos-Vegetation großflächig durch ihr schnelles Wachstum. Hauptziel dieser Arbeit war es, mit Hilfe der Fernerkundung Indikatoren zu finden, um eine schnelle und frühzeitige Aussage über die Gesundheit der verbliebenen natürlichen Vegetationsfragmente im Großraum Kapstadt zu ermöglichen. Zunächst wurde die Produktivität der Vegetation und deren Reaktion auf Niederschlag analysiert. Zu diesem Zweck wurden der Enhanced Vegetation Index (EVI) aus Terra-MODIS-Daten mit einer räumlichen Auflösung von 250m und Niederschlagsdaten von 19 Wetterstationen aus dem Zeitraum 2000 bis 2008 verwendet. Im Rahmen einer flexiblen Regression zwischen EVI und Niederschlagsdaten wurden verschiedene Verzögerungen der Reaktion der Vegetation auf den Niederschlag getestet. Des Weiteren wurden residuale Trends (RESTREND) berechnet, die sich aus der Differenz zwischen beobachtetem EVI und dem aus dem Niederschlag vorhergesagten EVI ergeben. Zusätzlich wurde die sogenannte Rain-use Efficiency (RUE) getestet. Diese ist definiert durch das Verhältnis zwischen Nettoprimärproduktion, repräsentiert durch die Jahressumme des EVI, und der Jahressumme des Niederschlags. Die angewandten Indikatoren wurden darauf untersucht, ob sie eine Aussage über die Gesundheit der einheimischen Fynbos-Vegetation ermöglichen. Des Weiteren wurde der Verbreitungsgrad invasiver Arten, besonders der der Weidenblatt-Akazie bestimmt. Auf Basis der spezifischen Charakteristika der getesteten Indikatoren und der spektralen Signatur von Acacia saligna, also ihrer besonderen Reflexion über den Jahresverlauf, wurde die Verbreitung ermittelt. Da das ungehinderte Wachstum invasiver Arten die Biodiversität der Fragmente stark verringert, ist ihre Anwesenheit ein wichtiger Faktor für die Gesundheit von Ökosystemen. Diese Arbeit konzentrierte sich auf 11 Testflächen mit einer durchschnittlichen Größe von 200ha, die über die gesamte Fläche des Großraums Kapstadt verteilt sind. Fünf dieser Fragmente stehen bereits unter Schutz, während die anderen in absehbarer Zeit folgen sollen; dies macht sie von besonderem Interesse. Im Januar 2010 wurden Geländearbeiten durchgeführt um den Zustand und die Zusammensetzung der Vegetation vor Ort festzustellen. Die Ergebnisse weisen aussichtsreiche Indikatoren zur Abschätzung der Ökosystemgesundheit auf. Die Werte des Bestimmtheitsmaßes der EVI-Niederschlags-Regression sind niedrig für Fynbos, da die Reaktion dieses Vegetationstyps auf Niederschlag wesentlich geringer ist als die der invasiven Arten. Daher ist auf Basis dieser Regression eine gute Unterscheidung zwischen einheimischer und invasiver Vegetation möglich. Auf der anderen Seite ist die RESTREND-Methode, für die diese Regression die Grundlage bildet, nur begrenzt von Nutzen, da die Signifikanzen dieser Trends für Fynbos-Vegetation nicht gegeben sind. Des Weiteren weist die RUE Potential für die Abschätzung von Ökosystemgesundheit im Testgebiet auf. Die Weidenblatt-Akazie hat einen wesentlichen höheren EVI als die Fynbos-Vegetation und daher ist deren RUE bei vergleichbarer Niederschlagsmenge effizienter. Dennoch muss diese mit Vorsicht angewandt werden, da die hohe lokale und temporale Variabilität der RUE im Testgebiet über die relativ kurze MODIS-Zeitserie nicht eliminiert werden kann. Die Ergebnisse verdeutlichen zudem, dass die Interpretation der Indikatoren anders als in der Literatur durchgeführt werden muss, da das Element der invasiven Vegetation in den meisten der vorangegangenen Arbeiten nicht berücksichtigt wurde. Ein Anstieg der Produktivität ist hier nicht gleichzusetzen mit einer Verbesserung der Gesundheit eines Fragments, sondern deutet viel mehr auf eine Verbreitung der Weidenblatt-Akazie hin. Dies verdeutlicht das generelle Problem des Begriffs ‚Degradation‘, welche in den meisten Veröffentlichungen nur über die Produktivität der Vegetation bestimmt wird während andere Faktoren wie zum Beispiel invasive Arten unberücksichtigt bleiben. Auf Basis der EVI-Niederschlags-Regression und der statistischen Messgrößen des EVI konnte die Verbreitung der invasiven Arten abgegrenzt werden. Generell wurde ein starker Befall der Testflächen durch die Weidenblatt-Akazie festgestellt. Die Ergebnisse machen deutlich, dass ein durchdachtes und nachhaltiges Management der Fragmente notwendig ist um die Verdrängung der einheimischen Fynbos-Vegetation durch Acacia saligna zu verhindern. Die Fernerkundung kann zu diesem Zweck Hinweise liefern, welche Flächen sich verändert haben um anschließend gezielte Begehungen vorzunehmen und Maßnahmen einzuleiten
Pope, Matthew. "A study of the Greater Glider (Petauroides volans) persisting in remnant eucalypt patches, surrounded by a softwood plantation matrix". Master's thesis, 2002. http://hdl.handle.net/1885/148457.
Texto completoBickford, Sophia Anastasia. "A historical perspective on recent landscape transformation: integrating palaeoecological, documentary and contemporary evidence for former vegetation patterns and dynamics in the Fleurieu Peninsula, South Australia / Sophia Anastasia Bickford". Thesis, 2001. http://hdl.handle.net/2440/21741.
Texto completoxx, 319, [30] leaves : ill. (some col.), maps ; 30 cm.
Palaeoecological records, documented historical records and remnant vegetation were investigated in order to construct a multi-scaled history of vegetation pattern and change in the Fleurieu Peninsula, South Australia over the last c. 8000 years. Aims to better understand post-European landscape transformation and address the inherently historical components of the problems of regional biodiversity loss, land sustainability and the cumulative contribution to global climatic change.
Thesis (Ph.D.)--University of Adelaide, Dept. of Geographical and Environmental Studies, 2001
Wilson, Anne-Marie. "Linking science, policy and practice in the conservation of woodland birds in a rural landscape : a case study in the South-West Slopes, New South Wales, Australia". Phd thesis, 2003. http://hdl.handle.net/1885/148277.
Texto completo