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 74 for “"Biotic interactions"”.
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Incorporating biotic interactions in phenology
… the availability of data that show how species interactions are affected by climate change is scarce and unified criteria are still lacking on the methodologies studying phenology and biotic interactions. The presented extensive review on the topic allowed the identification of four broad …
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Beyond productivity- Effects of extreme weather events on ecosystem processes and biotic interactions
… parameters, such as plant compounds or soil biotic activity. These changes in turn modify ecosystem functions beyond productivity, for example herbivory or decomposition, possibly altering biotic interactions and nutrient cycling. Furthermore, the findings imply that plants exhibit a stress …
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Quantifying biotic interactions with inshore subtidal structures: comparisons between artificial and natural reefs
… there were differences in the productivity and biotic interactions between artificial and nearby natural rocky reefs in Loch Linnhe, west coast of Scotland.<br/>A comparative study was carried out to evaluate methods used in the assessment of subtidal epibiotic assemblage structure followed by a …
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Effects of Biotic Interactions on Climate-Growth Relationships of Douglas-Fir and Ponderosa Pine
… environmental gradients. Moreover, plant-plant interactions may directly affect both intrinsic variables and local environment through direct effects on resource availability and habitat structure. Yet, despite general scientific agreement that the relative effects of abiotic stress and …
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Effects of Biotic Interactions on Climate-Growth Relationships of Douglas-Fir and Ponderosa Pine
… environmental gradients. Moreover, plant-plant interactions may directly affect both intrinsic variables and local environment through direct effects on resource availability and habitat structure. Yet, despite general scientific agreement that the relative effects of abiotic stress and …
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Ecological Perspectives on Cannabis sativa Phytochemistry: Biotic Interactions and Abiotic Stress in Managed and Natural Systems
… variation in phytochemistry influences arthropod interactions, or how these interactions differ across environmental conditions and cultivation systems. This dissertation takes an ecological lens to Cannabis phytochemistry, combining observational surveys, comparative analyses, and field …
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The role of abiotic and biotic interactions in deep-sea benthic habitats of the northeastern Gulf of Cadiz
The Gulf of Cádiz is influenced by the collision of the Alborán Domain with the North African and South Iberian margins, which ultimately promotes hydrocarbon-rich fluid venting, among other geological processes. Regarding oceanography, the single and interactive effects of the Eastern North …
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Biotic interactions through a macroecological lens: biogeographic trends in parasitism rates and life history effects on the evolution of cooperation
… across trophic levels and environments, biotic interactions determine the flow of nutrients and energy in an ecosystem, their effects on fitness having the ability to shape species' ecology. Biotic interactions are also highly context-dependent, varying in strength in response to many …
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Induced defenses in apple fruits: linking fruit chemistry, quality, and plant-insect-microbe interactions
… a diverse array of phytochemicals in response to interactions with herbivores, pathogens, and commensal microbes. These phytochemicals may simultaneously enhance crop defense and quality, representing a potential pest management strategy. However, plant chemical responses to different types and …
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Specificity in the ecology and evolution of plant defense against herbivores: Identity and history
Biotic interactions can structure communities, drive succession, and account for patterns of biodiversity, yet we currently know little about how multiple biotic factors interact to influence traits in ecological and evolutionary time. Moreover, variation in biotic interactions among native and …
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Traces of Predation/Parasitism Recorded in Eocene Brachiopods from the Castle Hayne Limestone, North Carolina, U.S.A.
… from eastern North America record any traces of biotic interactions. Systematic surveys of two North Carolina quarries yielded 494 brachiopods, dominated by one species: Plicatoria wilmingtonensis (Lyell and Sowerby, 1845). Despite subtle variations in taphonomy, taxonomy, and drilling patterns, …
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Determining the Influence of Abiotic and Biotic Predictors on Ecological Niche Models
<p>Biotic variables, including those reflecting interactions such as competition and parasitism, are generally assumed to have negligible effects on broadscale species distributions and are typically excluded from ecological niche models (ENMs). However, the role such interactions play in shaping …
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Tree community assembly and biogeochemical processes along an elevational gradient in western Panama
… of the effect of climate, edaphic and biotic interactions in plant community assembly and biogeochemical processes. Changes in environmental and biotic conditions are expected to influence tree diversity, floristic composition, nutrient and C cycling. My dissertation evaluates how …
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Applying ecological models to positive interactions among lotic fishes: implications for population and community regulation at multiple spatial scales
Positive biotic interactions such as mutualism, commensalism and facilitation are ubiquitous in nature, but historically have received considerably less research attention than negative interactions such as competition, predation and parasitism. The paucity of research on positive interactions is …
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THE ECOLOGICAL IMPORTANCE AND EVOLUTIONARY POTENTIAL OF PHENOTYPIC PLASTICITY IN NOVEL ENVIRONMENTS
… two chapters focused on plastic responses to abiotic environments, about which we have a wealth of theoretical and empirical understanding. Natural populations, however, almost never exist alone without interacting with other organisms. Biotic interactions are important drivers of species …
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Effects of interspecific competition, salinity, and hurricanes on the success of an invasive fish, the Rio Grande cichlid (Herichthys cyanoguttatus)
… this lack of persistence cannot be explained by abiotic variables I measured. Salinity may be a factor and this was measured in growth trials of H. cyanoguttatus. Salinities up to 16 ppt, however, had no significant effect on H. cyanoguttatus growth. Interspecific behavioral experiments were …
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The effect of the study region on GIS models of species geographic distributions and estimates of niche evolution; preliminary tests with montane rodents (genus Nephelomys) in Venezuela
… the species due to dispersal limitations and/or biotic interactions, this approach is prone to overfitting to conditions found near the known localities. In contrast, Method 2 is predicted to avoid such problems. I assessed differences in predictions for each species due to changes in the extent …
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Community- and species-level consequences of competition in an unproductive environment: an experimental approach using boreal forest understory vegetation
… and to determine whether the importance of these biotic interactions depend on abiotic factors. The results clearly show that species-specific responses to biotic interactions are not necessarily the same as community level responses and if we are to understand community structure, it is necessary …
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