The Effects of STEM Education on Economic Growth

This thesis aims to build on existing studies of human capital and returns to education with a focus on innovation-fueling, STEM-based education, to answer: How does STEM education affect macroeconomic growth across different countries? A review of literature reveals that many studies account for human capital in growth equations, measured as average years of education. However, educational attainment as a measure of human capital leaves out the additional impact of research, technological know-how and innovation on growth. This thesis seeks to bridge some of the overlap between education and innovation as it affects productivity by focusing on education in STEM—fields that produce workers able to meet the growing science- and technology-based innovation that lies at the core of modern economic growth. The empirical framework for this study is derived from the traditional neoclassical growth model and is augmented to include an enhanced form of human capital: STEM educational attainment. The factor constraining data availability is reports of STEM first university degrees from the National Science Foundation (2014). One data set covers 87 countries for 2010 or most recent period. A second set covers 15 countries over the 2000-2010 period. Drawing on both cross-sectional and panel data sets, as well as on data for existing physical capital, human capital and level of development, estimates are obtained using regression analysis. The results of this study indicate significant, positive effects of STEM education on productivity across specifications and call for policy that focuses on improving and promoting STEM programs at the post-secondary level

Habitat restoration and management of endangered species on Sydney sandstone outcrops

In accordance with current practice at The University of Sydney, this thesis is presented as a series of stand-alone manuscripts that have either been submitted to international journals for peer review, or have been peer reviewed and accepted for publication. Because they are similarly themed stand-alone manuscripts, there is some unavoidable repetition. Most of the ideas contained in this thesis are my own. In other cases I contributed substantially to the development of ideas, and the majority of work (including planning, designing, implementing, analysing and writing of manuscripts) was undertaken by me under the guidance of my supervisors. To maintain transparency regarding the level of contribution, I have listed all co-authors as they appear in published articles. Due to jointauthorship, the work presented in most chapters is discussed as “we” instead of “I”. All work was conducted under the approval of the Animal Ethics Committee of The University of Sydney (Animal ethics permit number: L04/12-2008/3/4927) and was approved by New South Wales National Parks and Wildlife Service (NPWS Scientific Licence: SL100472)

The Effects of STEM Education on Economic Growth

This thesis aims to build on existing studies of human capital and returns to education with a focus on innovation-fueling, STEM-based education, to answer: How does STEM education affect macroeconomic growth across different countries? A review of literature reveals that many studies account for human capital in growth equations, measured as average years of education. However, educational attainment as a measure of human capital leaves out the additional impact of research, technological know-how and innovation on growth. This thesis seeks to bridge some of the overlap between education and innovation as it affects productivity by focusing on education in STEM—fields that produce workers able to meet the growing science- and technology-based innovation that lies at the core of modern economic growth. The empirical framework for this study is derived from the traditional neoclassical growth model and is augmented to include an enhanced form of human capital: STEM educational attainment. The factor constraining data availability is reports of STEM first university degrees from the National Science Foundation (2014). One data set covers 87 countries for 2010 or most recent period. A second set covers 15 countries over the 2000-2010 period. Drawing on both cross-sectional and panel data sets, as well as on data for existing physical capital, human capital and level of development, estimates are obtained using regression analysis. The results of this study indicate significant, positive effects of STEM education on productivity across specifications and call for policy that focuses on improving and promoting STEM programs at the post-secondary level

Re: Investigating the impact of financial concerns on symptoms of depression in UK healthcare workers: data from the UK-REACH nationwide cohort study

This editorial comments on the paper by Martin McBride and the UK REACH team (published in 2023) investigating financial concerns in UK healthcare workers and depressive symptoms. The research concludes that reporting future financial concerns at baseline increased the odds of depressive symptoms at follow-up around 18 months later. We discuss these findings in the context of the cost-of-living crisis and pay disputes within the NHS, important policy implications and directions for future research

Movements and Habitat Use of an Endangered Snake, Hoplocephalus bungaroides (Elapidae): Implications for Conservation

A detailed understanding of how extensively animals move through the landscape, and the habitat features upon which they rely, can identify conservation priorities and thus inform management planning. For many endangered species, information on habitat use either is sparse, or is based upon studies from a small part of the species' range. The broad-headed snake (Hoplocephalus bungaroides) is restricted to a specialized habitat (sandstone outcrops and nearby forests) within a small geographic range in south-eastern Australia. Previous research on this endangered taxon was done at a single site in the extreme south of the species' geographic range. We captured and radio-tracked 9 adult broad-headed snakes at sites in the northern part of the species' distribution, to evaluate the generality of results from prior studies, and to identify critical habitat components for this northern population. Snakes spent most of winter beneath sun-warmed rocks then shifted to tree hollows in summer. Thermal regimes within retreat-sites support the hypothesis that this shift is thermally driven. Intervals between successive displacements were longer than in the southern snakes but dispersal distances per move and home ranges were similar. Our snakes showed non-random preferences both in terms of macrohabitat (e.g., avoidance of some vegetation types) and microhabitat (e.g., frequent use of hollow-bearing trees). Despite many consistencies, the ecology of this species differs enough between southern and northern extremes of its range that managers need to incorporate information on local features to most effectively conserve this threatened reptile. © 2013 Croak et al

Phylogeography and dispersal in the velvet gecko (Oedura lesueurii), and potential implications for conservation of an endangered snake (Hoplocephalus bungaroides).

ABSTRACT: BACKGROUND: To conserve critically endangered predators, we also need to conserve the prey species upon which they depend. Velvet geckos (Oedura lesueurii) are a primary prey for the endangered broad-headed snake (Hoplocephalus bungaroides), which is restricted to sandstone habitats in southeastern Australia. We sequenced the ND2 gene from 179 velvet geckos, to clarify the lizards' phylogeographic history and landscape genetics. We also analysed 260 records from a longterm (3-year) capture-mark-recapture program at three sites, to evaluate dispersal rates of geckos as a function of locality, sex and body size. RESULTS: The genetic analyses revealed three ancient lineages in the north, south and centre of the species' current range. Estimates of gene flow suggest low dispersal rates, constrained by the availability of contiguous rocky habitat. Mark-recapture records confirm that these lizards are highly sedentary, with most animals moving < 30 m from their original capture site even over multi-year periods. CONCLUSION: The low vagility of these lizards suggests that they will be slow to colonise vacant habitat patches; and hence, efforts to restore degraded habitats for broad-headed snakes may need to include translocation of lizards

Habitat Selection in a Rocky Landscape: Experimentally Decoupling the Influence of Retreat Site Attributes from That of Landscape Features

Organisms selecting retreat sites may evaluate not only the quality of the specific shelter, but also the proximity of that site to resources in the surrounding area. Distinguishing between habitat selection at these two spatial scales is complicated by co-variation among microhabitat factors (i.e., the attributes of individual retreat sites often correlate with their proximity to landscape features). Disentangling this co-variation may facilitate the restoration or conservation of threatened systems. To experimentally examine the role of landscape attributes in determining retreat-site quality for saxicolous ectotherms, we deployed 198 identical artificial rocks in open (sun-exposed) sites on sandstone outcrops in southeastern Australia, and recorded faunal usage of those retreat sites over the next 29 months. Several landscape-scale attributes were associated with occupancy of experimental rocks, but different features were important for different species. For example, endangered broad-headed snakes (Hoplocephalus bungaroides) preferred retreat sites close to cliff edges, flat rock spiders (Hemicloea major) preferred small outcrops, and velvet geckos (Oedura lesueurii) preferred rocks close to the cliff edge with higher-than-average sun exposure. Standardized retreat sites can provide robust experimental data on the effects of landscape-scale attributes on retreat site selection, revealing interspecific divergences among sympatric taxa that use similar habitats

Genetic Connectivity among Populations of an Endangered Snake Species from Southeastern Australia (Hoplocephalus bungaroides, Elapidae)

For endangered species that persist as apparently isolated populations within a previously more extensive range, the degree of genetic exchange between those populations is critical to conservation and management. A lack of gene flow can exacerbate impacts of threatening processes and delay or prevent colonization of sites after local extirpation. The broad-headed snake, Hoplocephalus bungaroides, is a small venomous species restricted to a handful of disjunct reserves near Sydney, Australia. Mark-recapture studies have indicated low vagility for this ambush predator, suggesting that gene flow also may be low. However, our analyses of 11 microsatellite loci from 163 snakes collected in Morton National Park, from six sites within a 10-km diameter, suggest relatively high rates of gene flow among sites. Most populations exchange genes with each other, with one large population serving as a source area and smaller populations apparently acting as sinks. About half of the juvenile snakes, for which we could reliably infer parentage, were collected from populations other than those in which we collected their putative parents. As expected from the snakes’ reliance on rocky outcrops during cooler months of the year, most gene flow appears to be along sandstone plateaux rather than across the densely forested valleys that separate plateaux. The unexpectedly high rates of gene flow on a landscape scale are encouraging for future conservation of this endangered taxon. For example, wildlife managers could conserve broad-headed snakes by restoring habitats near extant source populations in areas predicted to be least affected by future climate change