Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"understorey"”.
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The functional role of understorey herbs for litter decomposition in temperate forests
… climate variables. In forests, components like understorey vegetation are indispensable to ecosystem stability and ecological function. For example, the understorey layer may play an equally important role in regulating the soil microclimate as the overstorey tree canopy. Additionally, the …
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The interactive effects of fire and herbivory on understorey vegetation and its dependent fauna
Interactions between multiple disturbances have been shown to have unexpected, and often undesirable effects on ecosystems and biodiversity. Improving our ability to predict and manage the outcomes of multiple disturbances is therefore an important research priority. In this thesis, I focused on …
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The interactive effects of fire and herbivory on understorey vegetation and its dependent fauna
Interactions between multiple disturbances have been shown to have unexpected, and often undesirable effects on ecosystems and biodiversity. Improving our ability to predict and manage the outcomes of multiple disturbances is therefore an important research priority. In this thesis, I focused on …
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Structure and dynamics of the algal understorey in a kelp community at Cape Hangklip, Western Cape, South Africa
The objective of this thesis is to describe the composition and distributional variation of, and environmental factors influencing, the bottom canopy assemblages in a southern African kelp community at Cape Hangklip, Western Cape, South Africa. A detailed collection of intertidal and subtidal …
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Effects of climate and forest management on the water and nitrogen status of European beech regeneration and understorey vegetation
… of the effects of thinning-induced increases in understorey vegetation density on growth of beech regeneration. <br>It was concluded that thinning favours the N and water status of beech regeneration under the current climatic conditions. However, if prolonged drought periods and warming occur in …
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The effect of introduced Sitka black-tailed deer, Odocoileus hemionus sitkensis Merriam, on the forest understorey plant communities of Haida Gwaii, British Columbia: Pattern, process, and recovery
… effect of Sitka black-tailed deer on the forest understorey vegetation of this archipelago. In the first experiment we used a set of seven small islands (<15 ha) with different browsing histories (more than 50 years of deer presence, less than 20 years of deer presence, and no evidence of any …
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Kelp forests in False Bay: urchins vs. macroalgae in South Africa's south-west coast biogeographical transition zone
… were counted, percentage covers of various understorey algal species were recorded and drift algae were collected. Although there was significant variability in algal and urchin cover across the six sites, kelps generally increased from north to south, while urchins did the opposite. Urchins …
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Analisi vegetasi tumbuhan bawah di Cagar Alam Manggis Gadungan Kecamatan Puncu Kabupaten Kediri
… (INP) terendah dengan nilai 5,84%. ENGLISH: The understorey is an important component in forest ecosystems that must be taken into account its usefulness. The presence of understorey are expected to reduce disruption to the forest and can also be used as an indicator of forest condition. Allah …
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The influence of an umbelliferous understory on the parasites of organic apple orchards in Canterbury
… orchards were sampled, one with a natural grass understorey, and two with a managed wild parsnip understorey. Adult parasites were trapped using yellow pitfall traps, elevated water traps and aspiration from parsnip inflorescences. 'Delta' pheromone traps were used to trap male codling moth and …
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The soil seed bank in Agathis australis (D. Don) Lindl. (kauri) forests of northern New Zealand and its potential role in secondary successions
… vegetation and only 11%ot canopy and 13% of understorey species were represented in the soil seed bank. Thus, 77% of extant vegetation at any given site is floristically different from that of the soil seed bank. Ordination of the data by detrended correspondence analysis (DCA) suggested that …
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Thresholds for sustainable regeneration in urban restoration plantings in Hamilton City, New Zealand
… soil seed banks (fern spores inclusive) and understorey vegetation in urban forest were found to have higher exotic species richness and lower native species density and richness than rural forest. Both understorey vegetation and soil seed banks of urban sites >20 years old had lower exotic …
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Diversity and species composition of two different moth families (Lepidoptera: Arctiidae vs. Geometridae) along a successional gradient in the Ecuadorian Andes
… barely vegetated landslide area to mature forest understorey between 1,800 and 2,005 m above sea level. This study was part of a larger interdisciplinary project on diversity and functioning of a tropical mountain rainforest ecosystem. Moths were collected during three field periods in the years …
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Ecology of ragadia makuta (lepidoptera: satyrinae) in tropical rainforests of Sabah, Malaysia.
… logging. Logged forests had lower canopy and understorey cover and fewer large trees but a larger proportion of pioneer Macarangga spp. compared with unlogged forest. R. makuta abundance was not affected by selective logging. Habitat requirements of R. makuta were investigated and in both …
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The Impact of Habitat Alteration on the Population Dynamics of a Declining Woodland Bird in the Mount Lofty Ranges
… In the southern hemisphere, perennial native understorey plants have been largely outcompeted by fast-growing annual crop grasses and herbs. This significant compositional change has altered patterns of seed production. Granivores such as the diamond firetail (Stagonopleura guttata) are likely …
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Long-term patterns of mortality and regeneration in near-natural woodland
… (ii) a decline in stem density until understorey reinitiation/gap-phase regeneration occurred; (iii) an increase instratification, especially under lighter crowned trees and once reinitiation/regeneration occurred; (iv) a scarcity of canopy gaps until at least 125-150 years growth, …
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How does Himalayan Blackberry (Rubus armeniacus) impact breeding bird diversity? : a case study of the Lower Mainland of British Columbia
… between “natural” and R. armeniacus-dominated understoreys. More bird species were noted in habitats with greater structural and compositional diversity. Simpson’s richness/evenness index was significantly different between habitat types for Stanley Park and Maplewood Flats (P<0.05) but not …
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Substrate dependant survivorship of Ecklonia maxima, in southern African kelp communities
… storms may be limited by competition with understorey algae.
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Environmental correlates and associations of tuart (Eucalyptus gomphocephala) decline
… These included factors of stand structure, understorey composition,landform (soil type, geology, topography, and geography), climate (gradients and change), hydrology (depth, depth change, and chemistry), fire regimes, pollution and anthropogenic disturbance (fragmentation and site …
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Native forest tree conservation in tropical agroforests: Case study of cacao farms in the Atlantic Forest of southern Bahia, Brazil
… native forest tree regeneration on farms are the understorey management and the rural extension services that assisted farms obtain state-restricted rights.
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