Home About us Contact
|
Home About us Contact | ||
|
|
||
Greater Investment (greater + investment)
Selected AbstractsForaging specialisms, prey size and life-history patterns: a test of predictions using sympatric polymorphic Arctic charr (Salvelinus alpinus)ECOLOGY OF FRESHWATER FISH, Issue 1 2008D. Fraser Abstract,,, We use arguments based on optimal foraging theory to predict body size constraints and the consequences of these on a range of life-history traits in three trophic specialist morphs of Arctic charr, Salvelinus alpinus, living in sympatry in Loch Rannoch, Scotland. As predicted, foraging specialists feeding on small prey items with a narrow size range showed evidence of deterministic growth; the ultimate body size of macrobenthos feeders being larger (L, = 238 mm) than that of planktivores (L, = 216 mm). In contrast, the piscivorous morph showed no evidence of reaching a maximal body size. The two size-constrained morphs (benthivores and planktivores) matured earlier and died younger (living for up to 11 and 7 years, respectively, in this study) than did the piscivorous charr which showed continuous growth up to at least 17 years. The pattern of annual reproductive investment in maturing individuals was complex. Planktivores invested in larger eggs than the other two forms, but benthivores produced a greater number of eggs than planktivores, which in turn produced more than piscivores. Planktivorous males had a greater investment in mean testis weight than the other two forms. Lifetime reproductive output was the greatest in the benthivorous charr, intermediate in planktivorous and the lowest in the piscivorous charr when measured either as fecundity or as gonadal weight. We conclude that constraints imposed upon foraging specialists by foraging efficiency is a significant driver of body size and ultimately reproductive investment in gape-limited foraging salmonids. [source] Egg size differentiation among sympatric demes of brown trout: possible effects of density-dependent interactions among fryECOLOGY OF FRESHWATER FISH, Issue 3 2006F. Gregersen Abstract,,, This study investigates differentiation in egg size among five sympatric brown trout (Salmo trutta (L.)) demes. We explore a hypothesis predicting high density-dependent interactions among juveniles to favour large eggs by sampling closely located (<100 m) deme pairs with low and high fry abundances. A mancova model fitted the egg size versus egg number relationship as a function of large-scale spatial habitat heterogeneity (basin) and maternal phenotype revealed that demes have significantly different egg size versus fecundity relationships and that the differentiation is mainly due to interdeme variation in egg size. Fry density was significantly and positively associated with egg size and a post-hoc test indicated egg size to be significantly greater in high-density than low-density tributaries. The data is consistent with the density-dependent hypothesis and suggest that reproductive investment can diverge over small geographic distances, potentially in response to environments favouring greater investment in offspring quality. [source] Triage, treat and transfer: reconceptualising a rural practice model,JOURNAL OF CLINICAL NURSING, Issue 11-12 2010Elise Sullivan Aim., This article argues that the current model of emergency practice in rural Victorian hospitals, which relies heavily on visiting medical officers, needs to be reconceptualised if emergency services are to be supplied to rural communities. Background., Medical workforce shortages are manifesting in Victoria as a reduction in emergency care services from rural hospitals. The suggested alternative model of emergency care involves advancing nursing practice to enable a redistribution of clinical capacity across the health care team. Clinicians will need to work collaboratively and continuously negotiate their roles to meet the patient's and the clinical team's needs. Design., Systematic review. Methods., This article is based on a review of the Victorian and Australian literature on the subject of Victorian health services and policy, emergency care, collaboration, communication and rural nurse scope of practice and roles. Emergency care activity was drawn from data held in the Victorian Emergency Management Dataset and personal communications between one of the authors and hospital executives in a small selection of rural hospitals in Victoria. Results., The evidence reviewed suggests that the current emergency practice profile of rural hospitals in Victoria does not reflect the reconceptualised model of rural emergency practice. Instead, only a small proportion of non-urgent presentations is managed by nurses without medical support, and the data suggest that metropolitan nurses are more likely to manage without medical support than rural nurses. Conclusion., Reconceptualising rural emergency care in Victoria will require significantly greater investment in rural nurses' knowledge and skills to enable them to operate confidently at a more advanced level. Clinical teams that deliver emergency service in rural hospitals will be expected increasingly to work collaboratively and interprofessionally. Relevance to clinical practice., This article offers some directions for advancing nursing practice and strategies for improving interprofessional collaboration in the delivery of rural emergency care. [source] The Embedded Nature of Rural Legal Services: Sustaining Service Provision in WalesJOURNAL OF LAW AND SOCIETY, Issue 2 2007Alex Franklin There is a considerable amount of literature on embeddedness as part of sociological theory of economic action. Cultural and structural embeddedness often work together to shape the framework of economic relations, but, in an analysis of rural solicitors, we find unevenness between cultural and structural embeddedness. There are strong traits of the former, through a sense of place and belonging, but much less evidence of the latter with the structural relationships appearing relatively weak and underdeveloped. In a discussion supported by empirical data from a recent survey of rural legal practices in Wales, a number of causes are identified. The paper concludes that trends towards increasingly specialized rather than generalized legal service provision, set alongside the increasingly differentiated nature of rural space, suggest that the longer-term sustainability of rural legal practices may require both greater investment at the level of structural embeddedness alongside continuing reinvestment at the cultural level. [source] Parent age differentially influences offspring size over the course of development in Laysan albatrossJOURNAL OF ZOOLOGY, Issue 1 2008D. C. Dearborn Abstract Offspring growth and survival are predicted to be higher for older parents, due to a variety of mechanisms, such as increased breeding experience or greater investment favored by low residual reproductive value. Yet the extent to which parent age affects offspring viability is likely to vary between different aspects of growth and survival, perhaps being most pronounced at the most stressful stages of reproduction. We studied the link between parent age and nestling growth and survival in the Laysan albatross, a long-lived seabird with a mean first breeding age of 8 years. Offspring of older parents were more likely to survive to fledging. Among those that did fledge, nestlings of older parents grew more rapidly. However, parent age did not influence the eventual asymptotic size that nestlings reached before fledging: fast-growing nestlings of older parents reached 90% of asymptotic size roughly 1 week sooner, but slow-growing nestlings of younger parents eventually caught up in size before fledging. Older parents bred c. 2 days earlier than younger parents, but hatch date did not explain observed variation in offspring success. The extent to which parent age accounted for variation in size of individual nestlings was not constant but peaked near the midpoint of development. This could reflect a time period when demands on parents reveal age-based differences in parental quality. Overall, growth and survival of offspring increased with parent age in this species, even though the late age of first breeding potentially provides a 7-year period for birds to hone their foraging skills or for selection to eliminate low-quality individuals. [source] Alan Greenspan on the Economic Implications of Population AgingPOPULATION AND DEVELOPMENT REVIEW, Issue 4 2004Article first published online: 15 DEC 200 At the 2004 annual symposium of central bank leaders sponsored by the Federal Reserve Bank of Kansas City at Jackson Hole, Wyoming, Alan Greenspan, Chairman of the US Federal Reserve Board, devoted his opening remarks on 27 August to a discussion of the economic implications of population aging. The full text of his remarks is reproduced below. Greenspan's high prestige and great influence on US economic policy lend special interest to his views on this much-discussed subject (see also the next Documents item in this issue). He outlines the coming demographic shift in the United States in language that is characteristically cautious and qualified. (The elderly dependency ratio will "almost certainly" rise as the baby boom generation retires, Greenspan says, although elsewhere he terms the process, more accurately, inexorable.) The main factor responsible for population aging he identifies as the decline of fertility. Immigration is an antidote, but, to be effective, its size would have to be much larger than is envisaged in current projections. Greenspan's assessment of the economic consequences of the changing age structure highlights the prospect of a deteriorating fiscal situation in the United States: chronic deficits in the Social Security program over the long haul, assuming that existing commitments for benefits per retiree are met, and even greater difficulties for the health care system for the elderly,Medicare,in which the effects of increasing numbers in old age are amplified by advances in medical technology and the bias inherent in the current system of subsidized third-party payments. The sober outline of policy choices imposed by population aging,difficult in the United States, but less so, Greenspan notes, than in Europe and Japan,underlies the need for counteracting the declining growth of the population of labor force age through greater labor force participation and later retirement. Beyond that, growth of output per worker can provide the key "that would enable future retirees to maintain their expected standard of living without unduly burdening future workers." This requires continuation of policies that enhance productivity, such as deregulation and globalization, and greater investment. In turn, the latter presupposes greater domestic saving, both personal and by the government, as the United States cannot "continue indefinitely to borrow saving from abroad." Demographic aging requires a new balance between workers and retirees. Curbing benefits once bestowed is difficult: only benefits that can be delivered should be promised. Public programs should be recalibrated, providing incentives for individuals to adjust to the inevitable consequences of an aging society. [source] Who Gambles in the Stock Market?THE JOURNAL OF FINANCE, Issue 4 2009ALOK KUMAR ABSTRACT This study shows that the propensity to gamble and investment decisions are correlated. At the aggregate level, individual investors prefer stocks with lottery features, and like lottery demand, the demand for lottery-type stocks increases during economic downturns. In the cross-section, socioeconomic factors that induce greater expenditure in lotteries are associated with greater investment in lottery-type stocks. Further, lottery investment levels are higher in regions with favorable lottery environments. Because lottery-type stocks underperform, gambling-related underperformance is greater among low-income investors who excessively overweight lottery-type stocks. These results indicate that state lotteries and lottery-type stocks attract very similar socioeconomic clienteles. [source] Property rights and the public trust doctrine in environmental protection and natural resource conservation,AUSTRALIAN JOURNAL OF AGRICULTURAL & RESOURCE ECONOMICS, Issue 1 2009Jedidiah Brewer We examine the implications of the public trust doctrine in natural resource protection and conservation. A model of litigation and settlement among disputing parties suggests that the public trust doctrine introduces more costs and is more time consuming than would be the case with alternative approaches, such as the purchase of private rights through market transactions or application of eminent domain powers to reallocate the resource. Because the doctrine allows for uncompensated redistribution, it is resisted by current resource owners. Furthermore, by providing open standing to members of the public in challenging existing uses, public trust disputes encourage excessive demands, increasing the incidence of trial over settlement. This outcome is exacerbated if the plaintiffs derive utility from the ,cause' and provide litigation services at below-market rates, leading to greater investment in litigation. The costs of the public trust doctrine appear to have limited its application beyond the level anticipated by proponents. We present a case study of Mono Lake, part of the well-known 1983 litigation, National Audubon v. Superior Court to illustrate our arguments. [source] | |||||||||||||