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 1329 for “"Declines"”.
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Sensory and Cognitive Declines in Older Adults: A Longitudinal Study
… Sommers et al.: 2011) found that age-related declines in hearing, as assessed by pure-tone thresholds, begin around age 20 and continue across the lifespan. In another article published from the same cross-sectional dataset, Hale et al.: 2011) found that working memory ability also begins …
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Land Use Changes and Pheasant Declines in Eastern South Dakota
Changes in pheasant (Phasianus colchicus) nesting habitat were investigated on Windsor Township, Brookings County, South Dakota. The population was censused, nesting densities determined, cover was mapped, and an interspersion index determined in 197 7 and 1978. Comparison to a similar study …
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FROG DECLINES: EXPLORING CONNECTIONS AMONG CLIMATE CHANGE, IMMUNITY AND DISEASE
… over the world. For the past 20 years, marked declines have been recorded for 40% of the frog and toad species in the Monteverde Cloud Forest Preserve (MCFP), Costa Rica, where climate change and disease have been implicated. Our study explored possible connections between climate change, …
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Plague of absence : insect declines and the fate of ecosystems
… and locations in North America have also shown declines in number of insect species, abundance, and habitat. These declines have serious implications for ecosystems and for humans, some of which we can already see in effect, and some that scientists can't even predict to their full extent. This …
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Addressing Insect Declines Via Biodiversity Monitoring, Ecological Restoration, and Population Genetics
… management practices. Recently reported global declines in insect abundance, biomass, and diversity suggest a pressing need to fill these knowledge gaps. Here, I present work that address these knowledge gaps by exploring ways to generate more insect records for biodiversity datasets, …
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An Examination of Post-Pandemic Enrollment Declines in California’s Public Education System
<p>The persistent decline in enrollment in California public schools presents complex and far-reaching challenges, impacting budgets, staffing, and student outcomes. These challenges have been further compounded by the COVID-19 pandemic, which disrupted K-12 education nationwide. As students were …
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The Effect of Age-related Declines in Inhibitory Control on Audiovisual Speech Intelligibility
Audiovisual: AV) speech perception is perception in which both auditory and visual information is available in order to understand a talker, compared to an auditory signal alone, during face-to-face communication. This form of communication yields significantly higher word recognition performance …
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Effects of Age-Related Declines in Visual Motion Processing on Older Driver Safety
… three experiments investigating how age-related declines in visual motion processing affect older drivers’ ability to drive safely. In particular, these experiments assess the efficacy of: 1) A test of motion sensitivity, the Peripheral Motion Contrast Threshold (PMCT) test, which evaluates ones’ …
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Distribution Shifts and Declines in Autonomous Consumption: A Great Recipe for a Great Recession
<p>The Great Recession has been drawing the attention of many due mainly to its global impact that has been considered very similar to the Great Depression. So have been the root causes. Among the competing explanations, the present study focuses on two of them that were the same factors - among …
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Modelling mitigation of bird population declines in the UK through landscape-scale environmental management.
… the Hawfinch population. In Cambridgeshire, declines in hedge length would reduce the number of declining bird species supported (e.g. Yellowhammers), and most of the bird indices over this agricultural landscape. The spread of improved grass would reduce species richness and diversity, and …
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INFLUENCES OF DISEASE-DRIVEN AMPHIBIAN DECLINES ON ECOSYSTEM STRUCTURE AND FUNCTION IN PANAMANIAN HEADWATER STREAMS
… scales. Ongoing, disease-driven amphibian declines may influence the structure and function of stream ecosystems, but little is known of the potential roles of stream-dwelling tadpoles in consumer-resource dynamics, ecosystem functions such as decomposition, and ecosystem-level …
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ENERGY FLOW AND MACROINVERTEBRATE PRODUCTION IN PANAMANIAN HIGHLAND STREAMS: ASSESSING THE IMPACTS OF AMPHIBIAN DECLINES
… on the overall ecological effects of amphibian declines. As part of the Tropical Amphibian Declines in Streams (TADS) project, I quantified major energy fluxes, secondary production, and macroinvertebrate community structure for two consecutive years in four stream reaches in the Panamanian …
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Exploring metabolic and molecular mechanisms regulating age-related declines in human skeletal muscle regenerative capacity.
The underlying mechanisms regulating the ability of skeletal muscle to regenerate after acute “damaging” eccentric or “non-damaging” concentric exercise in young human skeletal muscle is poorly defined. Age-related impairments in the regenerative mechanisms may contribute to the age-related loss of …
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The Proposed Role of Positivity Resonance in Building Social Resources to Address Physical Activity Declines Across Adulthood
… Thus, I conducted two studies to address the declines in physical activity levels across the lifespan through shared positive emotions. In Study 1, 159 adults ages 18 and older were recruited using Prolific with equal representation of each of the adulthood stages: young (n = 55), middle (n = …
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THERE IS NO PLANET B(EE): AN INTEGRATED APPROACH TO UNDERSTANDING DRIVERS OF POTENTIAL DECLINES IN BUMBLEBEE COMMUNITIES
… and urban systems. Over the past four decades, declines in the range, diversity, and biomass of bumblebees have been well documented. Most studies link climate change and anthropogenic activity to these declines, yet we lack understanding of the fundamental mechanisms that underlay these …
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Assessment of Mussel Declines in the Clinch and North Fork Holston Rivers Using Histological Evaluations of Vital Organs
… States; however, both rivers are experiencing declines in mussel populations. The first component of this study used histological evaluations and water quality data to determine whether mussels were negatively impacted in the CR zone of decline (ZD) and to inform future management of freshwater …
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Back to the future? Unravelling current and potential future declines of the common toad, Bufo bufo, in the UK
Large scale and unexplained declines of the common toad, Bufo bufo, have been recorded in the UK for over two decades, especially in southern and central England. However, the extent of these declines and their causes are poorly understood. Except for “toad patrols” taking place in many parts of …
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The maximum quantum efficiency of CO2 assimilation declines with depth in the canopies of the C4 crops Miscanthus x giganteus and Zea mays
Leakage of CO2 from bundle sheath cells of C4 plants (φ) could limit their productivity. φ is thought to increase at low light in the C4 crop Miscanthus x giganteus (M. x giganteus) (Kromdijk et al., 2008). This should reduce photosynthetic light use efficiency (PLUE) in the lower canopy. Zea mays …
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Quantifying national abundance changes of raptors across Botswana using repeat road surveys
… birds experiencing considerable population declines across the globe. Despite these declines, many raptor populations remain poorly monitored across most of their ranges and, as with most biodiversity, this is especially true in developing countries, including most countries within Africa. …
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Causes and Consequences of a Collapsing Food Web in Lake huron
Lake Huron has undergone significant declines in abundance at multiple trophic levels. These declines are demonstrated to be the result of a decrease in the overall primary production, from an estimate of 100 g C m -2 yr-1 in the 1970s. to 32 g C m-2 yr -1 in this study. It is hypothesized that …
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