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 32 for “"seed predation"”.
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Seed predation along an elevational gradient in the Tropical Andes, Peru
… exert a large impact. Post-dispersal seed predation is a plant animal interaction that affects the population dynamics, community structure, and diversity of plant species through time and space. This thesis presents a comparative seed predation study of 24 species of tropical trees …
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Effects of predator satiation on seed predation in new roadside prairie plantings
1 PDF file (vi, 61 pages)
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Seed predation and potential dispersal of Ceratocaryum argenteum (Restionaceae) nuts by the striped mouse (Rhabdomys pumilio) / Joseph Douglas Mandla White
… to better understand the role of rodents as seed predators and dispersers in the fynbos biome at De Hoop Nature Reserve, South Africa in May and June, 2013. Based on previous studies I hypothesised that the large, nut-like seeds of Ceratocaryum argenteum (Restionaceae) are scatter-hoarded by …
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Ecology of flowering and fruiting in Lotus corniculatus L.
… U.K., mainly in an ex-arable field (Upper Seeds) and a more established grassland (Lower Seeds Reserve). The literature on self-incompatibility in L. corniculatus is reviewed; there are conflicting reports, but wild material is fundamentally self-incompatible. Plants in Upper Seeds are …
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Longterm Approaches to Assessing Tree Community Responses to Resource Limitation and Climate Variation
… ecophysiological responses to light, moisture, predation, and climate in eastern temperate forests of North Carolina. </p><p> First, I use a 19-yr seed rain record from 13 forest plots in the piedmont, transition zone, and mountains to examine how climate-mediated seed maturation and …
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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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Small mammal community structure (Rodentia: Muridae) in Punda Maria, Kruger National Park, South Africa : Causes and consequences
… with respect to community size and structure, seed predation and dispersal of several trees. Species populations, community structure and habitat attributes were measured at six sites comprising of 3 habitat types (2 sites per habitat); namely Acaciagrassland, North-facing and South-facing …
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Causes and consequences of the postfire increase in deer mouse (Peromyscus maniculatus) abundance
… I investigated the magnitude and impact of seed predation by deer mice in burned and unburned forest. In seed offerings experiments, overnight conifer seed removal associated with deer mice was more intense in burned than in unburned stands. In germination experiments, emergence of seedlings …
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Causes and consequences of the postfire increase in deer mouse (Peromyscus maniculatus) abundance
… I investigated the magnitude and impact of seed predation by deer mice in burned and unburned forest. In seed offerings experiments, overnight conifer seed removal associated with deer mice was more intense in burned than in unburned stands. In germination experiments, emergence of seedlings …
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Seed morphology and colour variation in derotinous Cape Proteaceae
I investigated seed colour polymorphism in Leucadendron is investigated for the possibility of crypsis in a post fire environment. Results were inconclusive, possibly due to a missed opportunity, but do not exclude the possibility of crypsis. Seed predation by birds may be an as yet undescribed and …
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The natural history, sensory ecology and biogeography of the seed dispersal of large fruits in Fynbos
Seed dispersal is a crucial life-history stage for the regeneration of all reseeding plants. In the Fynbos Biome of the Greater Cape Floristic Region (GCFR) of South Africa, at least 100 plant species have seed traits that suggest they are scatterhoarded by small mammals. The aims of this thesis …
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The role of small mammals in the population dynamics of two native grassland forbs: Lupinus sericeus and Lithospermum ruderale
Although post-dispersal seed predators are common and often reduce seed density, their influence on plant abundance remains unclear. We examined the impact of seed predation by small mammals, primarily deer mice (<i>Peromyscus maniculatus</i>), on seedling recruitment and plant establishment of two …
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The role of small mammals in the population dynamics of two native grassland forbs: Lupinus sericeus and Lithospermum ruderale
Although post-dispersal seed predators are common and often reduce seed density, their influence on plant abundance remains unclear. We examined the impact of seed predation by small mammals, primarily deer mice (<i>Peromyscus maniculatus</i>), on seedling recruitment and plant establishment of two …
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Seed biology of a recently introduced species, Myoporum laetum in comparison to a successful invasive alien, Acacia cyclops, in the southwestern Cape, South Africa
… evaluated, by comparing various aspects of its seed biology with those of another bird-dispersed alien, Acacia cyclops which is a successful invader in this region. M. laetum has higher annual seed production, but lower soil-stored seed banks than A. cyclops. Both experience high seed predation, …
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The demography of Balanites maughamii : an elephant-dispersed tree
… populations from the infrequent recruitment of seedlings, and facilitates the maintenance of populations over the short term. Balanites maughamii trees are reliant on African elephants (Loxodonta africana) for seed dispersal and to provide a germination cue through mastication. In the absence of …
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The effects of tropical forest management on biodiversity and ecosystem functioning
… decrease in ecosystem functioning (dung and seed removal) with a decrease in species richness, and a decrease in the biomass of large nocturnal tunnellers, suggesting that although some species are dominant, rare species are also needed to preserve full ecosystem functioning. 6. A complex …
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Elephant fruit :The dispersal attributes of Balanites maughamii / Storme Viljoen
… dispersal and examine the cues required for seed germination. Large, fleshy fruits with a single, exceptionally hard seed which requires a crushing force of > 2.0 kN to promote germination are characteristic of this species. Using scent analysis of ripe fruits, the range of volatile that are …
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Are black bears (Ursus americanus) effective seed dispersal agents? With a little help from their friends.
… americanus) are generally considered effective seed dispersal agents for fleshy-fruited plants because they can consume hundreds of fruits at once and have large home ranges. Seedlings can emerge from fecal piles, but if any seeds are removed from feces by rodents, it is often considered seed …
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