• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 596
  • 182
  • 175
  • 73
  • 59
  • 37
  • 25
  • 18
  • 16
  • 14
  • 11
  • 10
  • 10
  • 9
  • 9
  • Tagged with
  • 1441
  • 188
  • 164
  • 127
  • 108
  • 104
  • 95
  • 95
  • 85
  • 82
  • 78
  • 76
  • 64
  • 60
  • 58
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
191

Ecology of box mistletoe Amyema miquelii dispersal in pink gum Eucalyptus fasciculosa woodlands.

Ward, Matthew J. January 2007 (has links)
Title page, table of contents and abstract only. The complete thesis in print form is available from the University of Adelaide Library. / The proliferation of box mistletoe Amyema miquelii in eucalypt woodlands of south-eastern Australia may have resulted from the suppression of canopy fires, a reduction in herbivory by possums, and through environmental change, an improvement in conditions for mistletoe dispersal and establishment. In the Mount Lofty Ranges (MLR), South Australia, box mistletoe is often seen in high numbers in pink gum Eucalyptus fasciculosa woodlands. The following dissertation investigated box mistletoe dispersal and establishment by Mistletoebirds Dicaeum hirundinaceum in a pink gum woodland. The broad aims of the study were to advance our theoretical knowledge of mistletoe dispersal ecology, to understand why pink gum woodlands are more susceptible to mistletoe infection, and to increase the amount of ecological information available to land managers. A survey of box mistletoe and its Eucalyptus hosts in reserves of the MLR region revealed that almost a third of all pink gums were infected with box mistletoe. Individual pink gums with less foliage cover surrounding their canopy were more likely to host box mistletoe, suggesting canopy access for Mistletoebirds may influence the susceptibility of pink gums to mistletoe infection. Woodland type was more influential than fragmentation and edge effects in determining mistletoe presence, indicating a variation in host specificity across Eucalyptus species. The results of this survey indicated that further examination was required on Mistletoebird behaviour and mistletoe establishment success. Two aspects of Mistletoe bird ecology were examined: the influence of their movement patterns on the spatial dynamics of mistletoe dispersal, and their foraging behaviour. Mistletoebirds had home ranges of around 20 ha, and used small core areas (1 ha) of high mistletoe infestation more frequently than areas with lower mistletoe abundance. Modelling of mistletoe seed shadows indicated that the majority of mistletoe seeds (approx. 70%) would be deposited within 100 m of a parent plant. Consistent with this, seed rain modelling showed that mistletoe seed rain was aggregated, with birds dispersing large amounts of seed (> 66 000/ ha) in areas with higher mistletoe infestation levels. This indicated that the movements of mistletoe dispersers promote mistletoe aggregation not only at the scale of an individual tree, but also at a landscape scale. From a management perspective, the results indicated that the removal of mistletoes from single trees may have only short-term results, as reinfection from neighbouring host trees is likely. The attractiveness of pink gums to Mistletoebirds was a function of tree size, mistletoe crop size and tree access. Mistletoebirds preferred to forage in taller trees with a larger mistletoe crop size and which had greater canopy access, and Mistletoebirds most often alighted on dead pink gum when visiting a tree. The results support the notion that woodland dieback may improve conditions for mistletoe dispersal by allowing favourable habitat for Mistletoebirds, by increasing canopy access and by providing more perch sites. Dieback will also reduce mistletoe establishment, however, through a loss of suitable live host branches. The high frequency of box mistletoe infection in pink gum woodlands could also be explained by differences in establishment of box mistletoe between eucalypt species. A mistletoe establishment experiment demonstrated that establishment was significantly higher on pink gums than on E. porosa and E. camaldulensis, and that mistletoes established on pink gums were larger and had a greater number of leaves. The differences probably lay in underlying differences in host physical and chemical defences, and subsequent relative success of mistletoes to establish a functional haustorium. The dispersal syndrome of box mistletoe as described in this study is suitable and perhaps facilitated in the contemporary fragmented environment in a number of ways. These include an ability to concentrate their feeding and breeding activities in small areas of remnant vegetation, greater manoeuvrability between trees isolated by clearing, and easier access to the canopies and perch sites of individual trees in deteriorated woodlands. Priority research stemming from this study should include studies into the underlying causes of pink gum dieback, an experiment to test whether canopy die back directly results in more frequent visitation by Mistletoebirds, an examination of Mistletoebird movements in areas with low mistletoe abundance, and continued monitoring of mistletoe abundance and tree condition as established in this dissertation. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1285516 / Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2007
192

A new method for detection and classification of out-of-control signals in autocorrelated multivariate processes

Zhao, Tao, January 2008 (has links)
Thesis (M.S.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains x, 111 p. : ill. Includes abstract. Includes bibliographical references (p. 102-106).
193

Experimental investigation of shear capacity of precast reinforced concrete box culverts /

Burns, Jarrod Clinton. January 2006 (has links) (PDF)
Thesis (M.S. in civil engineering)--University of Texas at Arlington, December 2006. / Includes bibliographical references (leaves 85-86). Also available online.
194

Panting fatigue of AL-6XN stainless steel box girders /

Paterson, Duncan, January 2004 (has links)
Thesis (Ph. D.)--Lehigh University, 2004. / Includes vita. Includes bibliographical references.
195

Analysis of a thin-walled curved rectangular beam with five degrees of freedom

Moghal, Khurram Zeshan. January 2003 (has links)
Thesis (M.S.)--Mississippi State University. Department of Mechanical Engineering. / Title from title screen. Includes bibliographical references.
196

Measurement based performance evaluation of a segmental concrete bridge /

Davis, Rodney T., January 1999 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 515-518). Available also in a digital version from Dissertation Abstracts.
197

Eucalypt regeneration on the Lower Murray floodplain, South Australia

George, Amy Kathryn. January 2004 (has links)
Thesis (Ph. D.)--University of Adelaide, 2004. / Title from PDF t.p. (viewed on Sept. 25, 2005). Includes bibliographical references (p. 145-159).
198

Structural and functional analysis of progesterone receptor-DNA interaction /

Roemer, Sarah Clark. January 2005 (has links)
Thesis (Ph.D. in Molecular Biology) -- University of Colorado at Denver and Health Sciences Center, 2005. / Typescript. Includes bibliographical references (leaves 165-185). Free to UCDHSC affiliates. Online version available via ProQuest Digital Dissertations;
199

Three-dimensional thermal analysis of curved concrete box girder bridges

Ibrahim, Ahmed M. M. January 1995 (has links)
Thesis (M.A. Sc.)--Dept. of Civil Engineering, Concordia University, 1995. / Includes bibliographical references (leaves 141-145). Available also on the Internet.
200

Um modelo composto para realizar previsão de demanda através da integração da combinação de previsões e do ajuste baseado na opinião

Werner, Liane January 2005 (has links)
Resumo não disponível

Page generated in 0.0283 seconds