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 24 for “"seed rain"”.
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The Effects of Hackberry Psyllids on Refueling Migratory Songbirds and Autumnal Seed Rain
… and captured avian-dispersed fleshy fruit seeds (hereafter, seed rain) rain during the autumn of 2016 and 2017 to determine how hackberry psyllids, an ephemerally abundant insect, affect migrating songbird refueling indices estimated from blood samples, foraging activity, and subsequent …
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Fire and Road Disturbance Impacts on Forest Plant Species and Seed Rain in Table Mountain Fire Arai, Kittitas County, Washington
… influence have altered the plant community’s seed rain and vegetation. This study measured dispersed seeds and understory vegetation cover as functions of roads and fire intensity. Significantly more wind dispersed seeds were collected in high intensity fire sites. The peak in seed release was …
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Thresholds for sustainable regeneration in urban restoration plantings in Hamilton City, New Zealand
… drier and warmer climate, a prevalence of exotic seed sources and isolation from remnant native forest seed sources. This research investigates how these factors influence native species presence in different aged urban forest patches and uses life history traits to identify vulnerable species …
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The Influence of Dense Understory Shrubs on the Ecology of Canopy Tree Recruitment in Southern Appalachian Forests
… Many studies have investigated the causes of seedling inhibition beneath dense shrub understories, but few have uncovered specific mechanisms leading to seedling decline. In this study, I have examined the influence of the evergreen understory (R. maximum and Kalmia latifolia L.) on tree …
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Constraints to tree invasion on a nutrient-rich site during old-field succession
… addressed the factors controlling tree seedling establishment during old-field succession in east central Illinois. Seed bank density and its concentration beneath woody plants matched patterns observed for seed rain in fields last cultivated in 1968 and 1984. 736 seed traps, monitored …
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Ecology of plant-animal interactions during plant population expansion processes
… antagonistic and mutualistic, of predispersal seed predation and seed dispersal at the individual plant level and the resulting patterns such as seed rain and its maternal composition along the natural expansion gradient experienced by the Juniperus phoenicea subsp. turbinata population in the …
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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
The soil seed bank in Agathis australis (D. Don) Lindl. (kauri) forests of northern New Zealand is quantified, and its potential role in secondary successions examined. Seed bank data from a number of kauri forest sites stratified by successional time and distance from forest edges are summarized …
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Investigating mechanisms maintaining plant species diversity in fire prone Mediterranean-type vegetation using spatially-explicit simulation models
… this study: regeneration mode, annual maximum seed production, seed size, maximum crown diameter, drought tolerance, dispersal mode and seed bank type. Trait sets are used for the definition of plant functional types (PFTs). The PFT dynamics are simulated annual by iterating life history …
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When do propagules matter? The role of ecological filters and regeneration dynamics during community assembly in tallgrass prairie restorations
… in the abundance, richness, and diversity of seed and bud banks were quantified across an 11-year chronosequence of restored prairies and in prairie remnants to elucidate the degree to which the germinable seed bank, emerged seedlings, belowground buds, and emerged ramets were related to …
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Fruit chemical traits shape bat nutritional ecology: from basic science to applications
… Piper sancti-felicis fruits, showing that intraindividual variation of chemical traits can surpass interindividual variation and associations between chemical traits are scale-dependent, varying in strength and direction. Chapter Three explores how bats balance nutrient acquisition with …
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A comparative study of the seed bank dynamics of two congeneric alien invasive species
… is threatened by alien Acacia encroachment. The seed bank dynamics of the two most widespread invaders in the region, Acacia saligma and A. cyclops, was studied to elucidate those factors contributing most to their invasive success. This information was then used to assist in developing optimal …
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The Spatial and Temporal Ecology of Seed Dispersal by Gorillas in Lopé National Park, Gabon: Linking Patterns of Disperser Behavior and Recruitment in an Afrotropical Forest
… of fruit and disperse a great number of seeds. The majority these seeds are dispersed intact and viable in the dung. Dung is often deposited around the rim of a night nest or at a nest-site. Gorillas often construct nests in areas that have a sparse canopy, flattening the ground …
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Botanical processes in urban derelict spaces
… work included vegetation surveys, soil seed bank investigation, field mapping and seed rain trapping methods. Interpretation of the data involved a range of approaches including vegetation classification and ordination, comparative analysis of plant functional attributes and the …
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Ecology of box mistletoe Amyema miquelii dispersal in pink gum Eucalyptus fasciculosa woodlands.
… 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 …
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Resilience and recovery of plant communities facing increasing fire severity
… on recovery through recruitment from the soil seed bank. By establishing a greenhouse experiment, I observed how increasing fire severity reduced diversity in the soil seed bank. My fourth study examined post-fire recovery through seed dispersal. I monitored seed rain through collection from …
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Fruit to Sapling: an Ontogenetically Integrated Study of Tree Recruitment in an Amazonian Rainforest
… floodplain forest at three ontogenetic stages: seed fall, seedling establishment, and sapling recruitment.</p><p>From analyzing a long-term seed rain dataset collected using a high-density array of seed traps, I confirmed that seed fall decreases sharply with increasing distance from fruiting …
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Forecasted Afrotropical Forest Responses to Climate Change Diverge from Neotropical Predictions with Consequences for Biodiversity Conservation and Carbon Storage
… services in the coming century. The lowland rainforests of Central Africa in particular are expected to lose 41% of present dense forest cover in the next 50 years to forest clearing, due in large part to forest loss resulting from the expansion of subsistence agriculture and logging. …
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Exploring the potential of chaff lining in Virginia wheat and soybean production
Harvest weed seed control (HWSC) methods concentrate, remove, or destroy weed seeds captured by the combine during harvest. Furthermore, chaff lining uses a chute fitted on the back of a combine to concentrate chaff and weed seed therein into a narrow line. Since chaff amount increases with crop …
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Undercover predators: Vegetation mediates foraging, trophic cascades, and biological control by omnivorous weed seed predators
… production inputs. Vertebrate and invertebrate seed predators destroy a large percentage of weed propagules on the soil surface, and their ecosystem services may ease labor requirements for farmers in herbicide-free systems. Cover provided by living vegetation is an important predictor of seed …
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Understanding seed-soil adhesion by myxospermous seeds and their biophysical function in agroecosystems
Seedbanks provide many ecosystem services that support wildlife and regulate soil function. The fate of arable seeds is vital in shaping the aboveground composition of plant communities in agroecosystems. Understanding seed fate informs seedbank dynamics with multi-species interactions, as well as …
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