Enforcement and Compliance in Lima's Street Markets: The Origins and Consequences of Policy Incoherence toward Informal Traders

informal economy, taxation, law, government policy

Functional responses in the habitat selection of a generalist mega-herbivore, the African savannah elephant

Resource selection function (RSF) models are commonly used to quantify species/ habitat associations and predict species occurrence on the landscape. However, these models are sensitive to changes in resource availability and can result in a functional response to resource abundance, where preferences change as a function of availability. For generalist species, which utilize a wide range of habitats and resources, quantifying habitat selection is particularly challenging. Spatial and temporal changes in resource abundance can result in changes in selection preference affecting the robustness of habitat selection models. We examined selection preference across a wide range of ecological conditions for a generalist mega-herbivore, the savannah elephant (Loxodonta africana), to quantify general patterns in selection and to illustrate the importance of functional responses in elephant habitat selection. We found a functional response in habitat selection across both space and time for tree cover, with tree cover being unimportant to habitat selection in the mesic, eastern populations during the wet season. A temporal functional response for water was also evident, with greater variability in selection during the wet season. Selection for low slopes, high tree cover, and far distance from people was consistent across populations; however, variability in selection coefficients changed as a function of the abundance of a given resource within the home range. This variability of selection coefficients could be used to improve confidence estimations for inferences drawn from habitat selection models. Quantifying functional responses in habitat selection is one way to better predict how wildlife will respond to an ever-changing environment, and they provide promising insights into the habitat selection of generalist species

Similarity in habitat preferences impedes human elephant

Large conservation areas protect charismatic species and epitomize African savannahs, as do rural areas where people and wildlife live sympatrically but not always harmoniously. Incentives to include rural areas into conservation networks are lucrative and promise to improve conservation effectiveness. However, we show that in northern Botswana where a quarter of Africa’s savannah elephants live, people occupy habitats that are sought after by elephants. Elephants trying to access resources in these areas then face increased mortality, particularly in the most suitable habitats. To mitigate this risk, elephants responded by selecting less suitable habitats. Consequently conservation strategies that promote human-wildlife coexistence may prove unsuccessful, particularly when resource competition leads to wildlife mortality. Conservation should ensure that people do not limit wildlife’s access to prime habitat

Development of a portable multi-channel broadband near infrared spectroscopy instrument to measure brain tissue oxygenation and metabolism during functional activation and seizures

Epilepsy is a common neurological disorder often developed during childhood, characterised by abnormal neuronal discharges. These spontaneous recurrent seizures can be associated with poor long-term neurological development. Near-infrared spectroscopy (NIRS) is a non-invasive tech- nique able to monitor cerebral concentration changes in oxygenated- (∆[HbO2]) and deoxygenated- (∆[HHb]) haemoglobin. However, current commercial NIRS systems use only a few wavelengths, limiting their use to haemodynamic monitoring. Broadband NIRS (bNIRS) systems use a larger number of wavelengths enabling changes in concentration of the oxidation state of cytochrome-c- oxidase (∆[oxCCO]) to be determined, a marker of cellular metabolism. This thesis describes the development and miniaturisation of an existing bNIRS system to monitor haemodynamic and metabolic changes in children with epilepsy. Using the latest technological advancements, the bulk and complexity of the system was reduced while increasing the number of measurement channels. Two miniature tungsten halogen light sources were utilised with time- multiplexing capabilities implemented (0.5Hz). Bifurcated optical fibre bundles (2.8mm diameter) connected to each light source and twelve detector fibre bundles (1mm diameter) arranged linearly into a ferrule (25mm diameter); modification of the interface between the detectors and lens-based spectrograph ensured compatibility with the increased detector number. Light was collimated to a diffraction grating with a wider 308nm bandwidth and the largest CCD image sensor available (1340x1300 array, 26.8x26mm) was integrated into the system. LabVIEW software was updated to enable simultaneous, real-time collection and display of intensity and concentration changes. Extensive testing of the system was performed; in-vivo testing in healthy adults using a Stroop task demonstrated a typical haemodynamic response with regional variation in metabolism. Si- multaneous bNIRS and electroencephalography data were collected from 12 children with epilepsy in the Neurology Unit. One patient case study is presented in detail, with temporal data from 17 seizures collected. A large decrease in metabolism was observed in the left posterior region, corresponding to a region of cortical malformation, suggesting an energetic deficiency in this re- gion. This indicates the potential for ∆[oxCCO] as an investigative marker in monitoring seizures, providing localised information about cellular oxygen utilisation

Consequences of test use: a case study of employers’ voice on the social impact of English certification exit requirements in Taiwan

Background: This study investigates the social impact of a policy requiring university graduates to pass an English proficiency test by examining the consequences of test use in the workplace in Taiwan. Methods: Interviews were conducted with 19 business people in charge of recruiting potential employees in 17 industries across Taiwan. All these 19 employers hired the gratudes from a technological university in southern Taiwan. These interviews sought to discover the importance of English certification as an element of job hunting, the opinions of businesses regarding various certification tests, and their attitudes towards the exit requirement. Results and conclusions: Findings indicate that although these employers were favorably disposed towards this policy, only 13 % of them required English certificates as a hiring criterion. Another finding was that 53 % of employers regarded the certificates as evidence that applicants who possessed them were diligent and likely to be hard-working employees. These informants interpreted tests differently from testers, focusing on cultural notions of what personal qualities tests highlight rather than on language ability. Due to this and other factors, the impact of the test remained weak