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It is suggested that if Guttman’s latent-root-one lower bound estimate for the rank of a correlation matrix is accepted as a psychometric upper bound, following the proofs and arguments of Kaiser and Dickman, then the rank for a sample matrix should be estimated by subtracting out the component in the latent roots which can be attributed to sampling error, and least-squares “capitalization” on this error, in the calculation of the correlations and the roots. A procedure based on the generation of random variables is given for estimating the component which needs to be subtracted.
For an increasing proportion of Australian households, the Australian dream of home ownership is no longer an option. Neoliberal housing policy and the financialisation of housing has resulted in a housing affordability crisis. Historically, Australian housing policy has afforded only a limited role to local government. This article analyses the results of a nation-wide survey of Australian local governments’ perceptions of housing affordability in their local government area, the possibilities for their meaningful intervention, the challenges they face, the role of councillors and councils’ perceptions of what levels of government should take responsibility for housing. Almost all of the respondents from Sydney and Melbourne councils were clear that there is a housing affordability crisis in their local government area. We apply a framework analysing housing policy in the context of neoliberalism and the related financialisation of housing in order to analyse the housing affordability crisis in Sydney and Melbourne. We conclude that in order to begin resolving the housing crisis in Australia’s two largest cities there has to be an increasing role for local government, a substantial increase in the building of social and affordable housing and a rollback of policies that encourage residential property speculation.
A terrestrial (lacustrine and fluvial) palaeoclimate record from Hoxne (Suffolk, UK) shows two temperate phases separated by a cold episode, correlated with MIS 11 subdivisions corresponding to isotopic events 11.3 (Hoxnian interglacial period), 11.24 (Stratum C cold interval), and 11.23 (warm interval with evidence of human presence). A robust, reproducible multiproxy consensus approach validates and combines quantitative palaeotemperature reconstructions from three invertebrate groups (beetles, chironomids, and ostracods) and plant indicator taxa with qualitative implications of molluscs and small vertebrates. Compared with the present, interglacial mean monthly air temperatures were similar or up to 4.0°C higher in summer, but similar or as much as 3.0°C lower in winter; the Stratum C cold interval, following prolonged nondeposition or erosion of the lake bed, experienced summers 2.5°C cooler and winters between 5°C and 10°C cooler than at present. Possible reworking of fossils into Stratum C from underlying interglacial assemblages is taken into account. Oxygen and carbon isotopes from ostracod shells indicate evaporatively enriched lake water during Stratum C deposition. Comparative evaluation shows that proxy-based palaeoclimate reconstruction methods are best tested against each other and, if validated, can be used to generate more refined and robust results through multiproxy consensus.
The U.S. has the tools to end the HIV epidemic, but progress has stagnated. A major gap in U.S. efforts to address HIV is the under-utilization of medications that can virtually eliminate acquisition of the virus, known as pre-exposure prophylaxis (PrEP). This document proposes a financing and delivery system to unlock broad access to PrEP for those most vulnerable to HIV acquisition and bring an end to the HIV epidemic.
Successful conservation depends on human attitudes, values, and support. Increasingly scientists and managers analyse not only species status and needs, but also the long-term cost, risk, and effectiveness of activities. Socioeconomic costs and benefits are integral to these analyses. Gorongosa National Park in Mozambique provides a case study of conservation integrated with local community needs. Endangered Delta smelt in California exemplify conflicts around water apportionment. Case studies demonstrating the importance of socioeconomic considerations are provided by management of gray wolves and grizzly bears in the United States. The story of sage grouse illustrates how a regional agreement that resulted from many years of collaboration among stakeholders can be nullified by political changes at the national level. The cultural and socioeconomic values and rights of indigenous people play a prominent role in salmon management that can run counter to the interests of hydroelectric companies and other water users. Case studies illustrate how habitat management can be facilitated by participation by non-governmental organizations. Socioeconomic and political consideration also underlie the question of who can take responsibility for managing conservation-reliant species.
A conservation-reliant species is vulnerable to threats that persist; it requires continued management intervention to prevent a decline toward extinction or to maintain a population. The degree of conservation reliance varies over time and among species. Globally, the extent of conservation reliance is accelerating faster than we can provide resources to combat extinctions and promote recovery. A species is recognized as being conservation reliant or emerging from that status based on a general assessment that includes status and threats, the potential for managing the threats, actions taken to manage the threats and the species itself, population monitoring, and monitoring of threats. Species differ in their susceptibility to threats and their potential to respond to management actions, and threats differ in manageability. We use California condor management as a case study for these features of conservation reliance.
Understanding threats and our ability to manage them is the first step in shepherding conservation-reliant species toward sustainability or recovery. This chapter contrasts situations in which a single threat dominates with more complex situations in which multiple threats interact. Interactions among threats raise the likelihood of conservation reliance, as this chapter illustrates in a case study of vultures. Several other case studies illustrate the effectiveness of different legal and management approaches to imperilment and the importance of identifying its root causes. Case studies, including some revolving around dams, also illustrate the complexities that attend socioeconomic drivers of imperilment and differences in the scale and manageability of threats. The chapter also describes several threats such as storms, tsunamis, or volcanic eruptions that are not manageable.
The array of tools for addressing the needs of imperiled and conservation-reliant species is increasing. This chapter provides case studies and examples of the use of translocation and captive breeding for addressing threats, and discuss attributes of receiving sites. Tools for tracking species movements and for remote sensing can efficiently provide large amounts of habitat and species data. Sometimes tools can be used to address common threats such as those created by habitat change or pesticide use, benefitting multiple species. We provide Old World vultures offer a case study. Managing for surrogate, umbrella, indicator, focal, keystone, or pollinator species may assist other species as well. Such roles should be acknowledged in prioritizing conservation activities. Emerging technologies, including genetic tools and artificial intelligence, can help to address imperilment and conservation reliance if ethical issues can be navigated.
Many nations have developed policies and enforced legal approaches for addressing the needs of species at risk of extinction. Generally, however, conservation reliance is not acknowledged legally and is therefore ignored. Increasingly, legal approaches reflect the importance of (1) values in addition to hunting and fishing, (2) wildlife as a shared resource, (3) intrinsic rather than instrumental value, (4) helping species to become self-sustaining, and (5) long-term support for imperiled species. The International Union for the Conservation of Naturehas provided an international standard for recognizing species status. In the United States, the Endangered Species Act and National Environmental Policy Act provide a legal framework for species conservation that has been effective (although these acts have also spawned many legal challenges that have consumed the time and resources of stakeholders). The effectiveness of imperiled species laws depends on funding that can vary, leading to varying implementation and enforcement. Conservation reliance is seldom addressed explicitly. Responsibility for implementation may be spread across national, state or province, and more local entities.
Current methods for making decisions about what to fund and at what level are not sufficiently transparent or objective. Acknowledging conservation reliance fosters a realistic approach and outcomes. Prioritization requires an agreed-upon pool of species to consider within a defined area. Defining and ranking prioritization criteria presents a variety of challenges, including accounting for the manageability of threats, species vulnerability, and species genetic and phenotypic traits. Including social and economic factors increases the probability that plans will be implemented. This chapter also considers how factor weightings are derived and means of dealing with uncertainty. Four examples of prioritization processes illustrate the variety of current approaches. Few approaches explicitly consider the long-term demands of conservation reliance. The ethics that underlie conservation triage affect how people undertake prioritization. This book advocates the use of explicit prioritization criteria that include uncertainties and derive from values and interests of diverse stakeholders. Models should acknowledge a wide array of ecological and socioeconomic costs and benefits, probabilities of success, and projected conservation reliance.
Conservation reliance exists along a spectrum from species extinction to species recovery; from requiring intensive to minimal management. This chapter provides case studies of full or partial recovery and explores what made this possible using the Oregon chub, Aleutian cackling goose, southern white rhinoceros, black-capped vireo, and Robbins’ cinquefoil. Toward the other end of the spectrum, continued translocations or releases are required to maintain Oregon silverspot butterflies and Chatham Island black robins. Management is not always successful, however, as seen for Australian woylies. Some species, such as the Guam kingfisher, are extinct in the wild but maintained in zoos. Finally, there are lessons to be learned from species such as the po’ouli, dusky seaside sparrow, and Christmas Island pipistrelle, for which investments were too little or too late. Management of imperiled species is a societal investment and people’s attitudes play an important role in successful recovery. Participation by citizens and non-governmental organizations is particularly important when species are conservation reliant, as the long-term investment required can rarely be sustained otherwise.
People differ in how and how much they value nature, and in their attitudes toward conservation. This affects the implementation of laws and regulations and the criteria used in prioritization of conservation actions. Yet collaboration is essential, especially when conservation reliance requires long-term commitments. Individuals, communities, government agencies, and non-governmental organizations must all be involved. Shepherding nature is about taking responsibility for watching over and caring for species and Earth’s biodiversity. Countering the rising rate of extinctions will require a transformative change in how people relate to the environment, nature, and one another.