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.
Results
Showing 1 to 20 of 105 for “"biotic factors"”.
-
Abiotic and Biotic Factors Shaping Plant-Microbe Interactions
… of scientific understanding. Given that the biotic and abiotic contexts of ecological communities is rapidly shifting due to anthropogenic change, understanding the factors that shape plant-microbe interactions will allow us to make more accurate predictions of ecological interactions both …
-
NATURAL REGENERATION DYNAMICS AND SURVIVAL INFLUENCED BY ABIOTIC AND BIOTIC FACTORS IN A BOTTOMLAND HARDWOOD FOREST
… Conservation Area in East Texas to identify abiotic and biotic factors important for successful establishment of native regeneration. Areas sampled included two that were previously treated with herbicide for Chinese tallow (<em>Triadica sebifera </em>L.) and one untreated, reference area.</p> …
-
Abiotic and biotic factors influencing the decline of native unionid mussels in the Clinch River, Virginia
… link in the complex life cycle. Two possible factors which could endanger the sensitive juvenile stage are the presence of sediment toxicants or adult Corbicula fluminea in the depositional areas, the preferred habitat of the juveniles. Before investigating the impacts of these factors, it was …
-
Microbial activity on wood in streams: exploring abiotic and biotic factors affecting the structure and function of wood biofilms
… of microbial colonization of wood and factors affecting the structure and function of wood biofilms in streams, the first two chapters summarize research conducted in New Zealand and compare the composition of biofilm colonizing wood to that colonizing rocks and leaves. Similar biofilms …
-
Effects of several abiotic and biotic factors and plant hormones on growth, morophology, and camptothecin accumulation in Camptotheca acuminata seedlings
… dissertation seeks to explore the effects of abiotic factors [nitrogen (N), sodium chloride (NaCl), and ultraviolet (UV) light], biotic factor [acetylsalicylic acid (ASA)], and plant hormones [benzyl adenine (BA) and naphthalene acetic acid (NAA)] on growth, morphology, and secondary …
-
Effects of abiotic and biotic factors on population dynamics of brook trout (<i>Salvelinus fontinalis</i>) within Shenandoah National Park, Virginia
… Anthropogenically-influenced variables, and (4) Biotic variables. I found that all variable categories were important in predicting variation in brook trout abundance across space and over time. Biotic variables had high importance compared to other categories. For example, American eel (Anguilla …
-
Lithologic, edaphic, and biotic factors of small mammal habitats in the slate belt of Western Rutland County, Vermont, and Eastern Washington County, New York
… different combinations of environmental factors. Habitats were divided into five main categories, and the type of cover at each trap was recorded. Species trapped included Peromyscus Zeucopus noveboracensis, Peromyscus maniculatus gracilis, Sorex fumeus, Blarina brevicavda, Clethrionomys …
-
Determining habitat and biotic factors driving puma (<i>Puma concolor</i>) space use and underlying dynamic processes (colonization and extinction) over 20 years in protected and private areas throughout Belize, Central America
… and multi-season occupancy modeling to explore factors influencing distribution and persistence of pumas across the country of Belize. We used camera trapping data from 7 protected areas over 20 years with 2,198 camera stations covering ~5,000 km2. For both approaches, detection was mostly …
-
Annual cycle and morphology of lice parasitizing two sympatric African small mammals (Micaelamys namaquensis and Elephantulus myurus)
… parasites are mainly affected by environmental (abiotic) and host/parasite (biotic) factors. Lice of the suborder Anoplura are permanent haematophagous ectoparasites that spend their entire life cycle on the host. Due to this close relationship, most studies have reported that lice are mainly …
-
Communities of Arbuscular Mycorrhizal Fungi in Salt Marsh Habitats: Diversity, Structure, and Ecosystem Function
… same sites, this study also examined the role of biotic factors that are likely to influence the relationship of rhizosphere fungal communities with each other. Although a range of local abiotic factors significantly influenced the composition of fungal communities within each salt marsh, at …
-
The ecology of some Harpacticoid copepods of a California sand flat
… on the effects of physical interactions and biotic factors on these populations. The species were: Amphiascopsis sintus (Claus) 1866, Stenhelia (D.) oblonga Lang, 1965, Heterolaphote variables Lang, 1965, Ectinosoma melaniceps Boek ? var. T. Scott, 1902, Paralophonte subterraneas Lang, 1965, …
-
Feeding Ecology and Factors Influencing Growth and Recruitment of Channel Catfish in South Dakota Reservoirs
… the impact of Channel Catfish populations and factors that influence their dynamic rates are not known. To address the lack of understanding of the basic ecology of Channel Catfish in South Dakota we studied nine South Dakota reservoirs (small impoundments, tributary-storage reservoirs, …
-
Predicting Insect Herbivore Distribution Using Climatic and Biotic Variables
… These variations can be explained by abiotic variables such as precipitation, they can also be explained by biotic variables such as nutrient availability. Here I present two field observational and two laboratory experimental studies to better understand factors and mechanisms …
-
The ecology of the mosquito Culex modestus, a potential vector of West Nile virus in the UK
… drainage ditches along with information on both abiotic and biotic factors at each Sample Point. Culex modestus larvae were present from early July until late October at all four Locations, with populations peaking between late August and September. In 2016, an additional six Locations were …
-
Abiotic and biotic determinants of tick-borne disease risk in Central Panama
… Tick distributions are strongly influenced by abiotic factors, including temperature and humidity, and spatial abundance and temporal activity patterns vary among tick species and life stages. Abiotic variables influence off-host tick survival and may define the limits of a tick’s geographic …
-
Modelling the current and potential distribution of woody plants, with special emphasis on the importance of spatial scale and environmental factors
… aim of this thesis is to explore the role of abiotic and biotic factors in mediating the distribution of woody plants, particularly invasive alien species. Predictions of the future distribution of invasive species are required for management, conservation actions, and legislation. Using …
-
Spatial and temporal influences on the physiological condition of invasive silver carp
… or facultative planktivorous fishes. Currently, factors motivating or controlling the spread of Asian carp have not been well defined, and little is known about the potential consequences of recently discovered hybrids between bighead and silver carp. Improving our understanding of how Asian carp …
-
Airport business excellence : a holistic approach to performance management
… components. We first investigate airports biotic factors, i.e. all living airport participants and their relations. To do so, we develop a novel Airport Business Excellence Model (ABEM) which assesses airport performance using twelve groups of criteria: Leadership, Strategy, HRM, Suppliers …
Page 1 of 6