Showing papers by "Manchester Metropolitan University published in 2008"

The status of the world's land and marine mammals: diversity, threat, and knowledge

Abstract: Knowledge of mammalian diversity is still surprisingly disparate, both regionally and taxonomically. Here, we present a comprehensive assessment of the conservation status and distribution of the world's mammals. Data, compiled by 1700+ experts, cover all 5487 species, including marine mammals. Global macroecological patterns are very different for land and marine species but suggest common mechanisms driving diversity and endemism across systems. Compared with land species, threat levels are higher among marine mammals, driven by different processes (accidental mortality and pollution, rather than habitat loss), and are spatially distinct (peaking in northern oceans, rather than in Southeast Asia). Marine mammals are also disproportionately poorly known. These data are made freely available to support further scientific developments and conservation action.

Identification of elderly fallers by muscle strength measures

Abstract: For efficient prevention of falls among older adults, individuals at a high risk of falling need to be identified. In this study, we searched for muscle strength measures that best identified those individuals who would fall after a gait perturbation and those who recovered their balance. Seventeen healthy older adults performed a range of muscle strength tests. We measured maximum and rate of development of ankle plantar flexion moment, knee extension moment and whole leg push-off force, as well as maximum jump height and hand grip strength. Subsequently, their capacity to regain balance after tripping over an obstacle was determined experimentally. Seven of the participants were classified as fallers based on the tripping outcome. Maximum isometric push-off force in a leg press apparatus was the best measure to identify the fallers, as cross-validation of a discriminant model with this variable resulted in the best classification (86% sensitivity and 90% specificity). Jump height and hand grip strength were strongly correlated to leg press force (r = 0.82 and 0.59, respectively) and can also be used to identify fallers, although with slightly lower specificity. These results indicate that whole leg extension strength is associated with the ability to prevent a fall after a gait perturbation and might be used to identify the elderly at risk of falling.

The acute effect of stretching on the passive stiffness of the human gastrocnemius muscle tendon unit.

Abstract: Passive stretching is commonly used to increase limb range of movement prior to athletic performance but it is unclear which component of the muscle-tendon unit (MTU) is affected by this procedure. Movement of the myotendinous junction (MTJ) of the gastrocnemius medialis muscle was measured by ultrasonography in eight male participants (20.5 +/- 0.9 years) during a standard stretch in which the ankle was passively dorsiflexed at 1 deg s(-1) from 0 deg (the foot at right angles to the tibia) to the participants' volitional end range of motion (ROM). Passive torque, muscle fascicle length and pennation angle were also measured. Standard stretch measurements were made before (pre-) and after (post-) five passive conditioning stretches. During each conditioning stretch the MTU was taken to the end ROM and held for 1 min. Pre-conditioning the extension of the MTU during stretch was taken up almost equally by muscle and tendon. Following conditioning, ROM increased by 4.6 +/- 1.5 deg (17%) and the passive stiffness of the MTU was reduced (between 20 and 25 deg) by 47% from 16.0 +/- 3.6 to 10.2 +/- 2.0 Nm deg(-1). Distal MTJ displacement (between 0 and 25 deg) increased from 0.92 +/- 0.06 to 1.16 +/- 0.05 cm, accounting for all the additional MTU elongation and indicating that there was no change in tendon properties. Muscle extension pre-conditioning was explicable by change in length and pennation angle of the fascicles but post-conditioning this was not the case suggesting that at least part of the change in muscle with conditioning stretches was due to altered properties of connective tissue.

Tightening the link between employee wellbeing at work and performance

Abstract: Purpose – The purpose of the paper is to show that, though essential, the achievement of business‐oriented performance outcomes has obscured the importance of employee wellbeing at work, which is a neglected area of inquiry within the field of human resource management. Instead the emphasis typically placed on the business case for HRM suggests a one‐sided focus on organisational outcomes at the expense of employees. With this in mind, this paper seeks to examine the effects of HRM practices on employee wellbeing and performance.Design/methodology/approach – Data were collected from a public sector (local government) organisation to identify the link between HRM practices, employee wellbeing at work, and performance. A preliminary staff survey of employees provides a brief overview of the link between HRM practices, employee wellbeing at work and performance.Findings – HRM practices adopted have a significant impact on employee wellbeing at work and tend to be more positive than negative. Overall a consis...

Ageing in Place in the United Kingdom

Abstract: Ageing in Place is a key component of UK policy on older people and housing. Helping older people to ‘age in place’ at home is seen to benefit the quality of life and also provide a cost-effective solution to the problems of an expanding population of very old people. However, the reality is not straightforward and in this paper, some results of qualitative research are presented to illustrate the benefits, problems and challenges that exist in relation to Ageing in Place in the United Kingdom. The research is based on qualitative data collected from 40 people age 80–89 in the north-west of England as part of the ENABLE-AGE Project 2002 to 2004. The research suggests that while Ageing in Place may bring social and psychological benefits, there can also be a significant downside on an everyday level. Home in old age can be a place of negative experiences, such as isolation and loneliness and there are often significant weaknesses in terms of informal support, physical environment of the home and neighbourhood and social network, which undermine the person’s ability to live independently. The paper reviews recent UK initiatives to use “telecare” to address some of these issues.

Human tendon behaviour and adaptation, in vivo.

Abstract: Tendon properties contribute to the complex interaction of the central nervous system, muscle-tendon unit and bony structures to produce joint movement. Until recently limited information on human tendon behaviour in vivo was available; however, novel methodological advancements have enabled new insights to be gained in this area. The present review summarizes the progress made with respect to human tendon and aponeurosis function in vivo, and how tendons adapt to ageing, loading and unloading conditions. During low tensile loading or with passive lengthening not only the muscle is elongated, but also the tendon undergoes significant length changes, which may have implications for reflex responses. During active loading, the length change of the tendon far exceeds that of the aponeurosis, indicating that the aponeurosis may more effectively transfer force onto the tendon, which lengthens and stores elastic energy subsequently released during unloading, in a spring-like manner. In fact, data recently obtained in vivo confirm that, during walking, the human Achilles tendon provides elastic strain energy that can decrease the energy cost of locomotion. Also, new experimental evidence shows that, contrary to earlier beliefs, the metabolic activity in human tendon is remarkably high and this affords the tendon the ability to adapt to changing demands. With ageing and disuse there is a reduction in tendon stiffness, which can be mitigated with resistance exercises. Such adaptations seem advantageous for maintaining movement rapidity, reducing tendon stress and risk of injury, and possibly, for enabling muscles to operate closer to the optimum region of the length-tension relationship.

Factors Affecting Teachers’ Pedagogical Adoption of ICT

Abstract: this chapter uses insights from socio-cultural theory to develop a new analysis of the process of teachers’ pedagogical adoption of ICT. It refutes the common assumption that failure to embed ICT in pedagogy is the result of teachers’ resistance to change, and argues the need for a wider analytic frame that takes into account complex cultural factors and the regulatory frameworks and policies of national education systems. Humans learn to use new tools by, first, attempting to find a ‘fit’ with existing social practices and over time, through experimentation, developing new social practices that take advantage of their affordances. This process is always enabled or constrained by organisational structures, social contexts and established mechanisms of control, such as national curricula and assessment regimes. The chapter provides examples of transformative pedagogies with ICT and draws attention to the common factors which have enabled their success.

Engaging a new generation of graduates

Abstract: Purpose – The purpose of this paper is to explore the concept of generational difference and reflect on how this might impact on organisational approaches to graduate development.Design/methodology/approach – The paper explores the characteristics of Generation Y graduates and the implications of their entry into the workplace for organisations' graduate learning and development programmes, drawing on academic and popular literature and the organisational experience of one major employer of young people.Findings – This paper presents a profile of Generation Y and suggests that the learning styles and expectations of this group are very different from earlier generations. Using its experiences of employing Generation Y the case study organisation suggests future graduate development schemes need to utilise the latest technology to deliver audio‐visually rich, multi‐tasking challenges which require a collaborative approach, offer instant feedback whilst at the same time recognising that its participants may...

Children with cerebral palsy exhibit greater and more regular postural sway than typically developing children

Abstract: Following recent advances in the analysis of centre-of-pressure (COP) recordings, we examined the structure of COP trajectories in ten children (nine in the analyses) with cerebral palsy (CP) and nine typically developing (TD) children while standing quietly with eyes open (EO) and eyes closed (EC) and with concurrent visual COP feedback (FB). In particular, we quantified COP trajectories in terms of both the amount and regularity of sway. We hypothesised that: (1) compared to TD children, CP children exhibit a greater amount of sway and more regular sway and (2) concurrent visual feedback (creating an external functional context for postural control, inducing a more external focus of attention) decreases both the amount of sway and sway regularity in TD and CP children alike, while closing the eyes has opposite effects. The data were largely in agreement with both hypotheses. Compared to TD children, the amount of sway tended to be larger in CP children, while sway was more regular. Furthermore, the presence of concurrent visual feedback resulted in less regular sway compared to the EO and EC conditions. This effect was less pronounced in the CP group where posturograms were most regular in the EO condition rather than in the EC condition, as in the control group. Nonetheless, we concluded that CP children might benefit from therapies involving postural tasks with an external functional context for postural control.

Graduate entrepreneurship: intentions, education and training

Abstract: Purpose – The paper's purpose is to present an introduction to the special issue is that positions and explores some of issues and challenges in the field of graduate entrepreneurship.Design/methodology/approach – The paper examines a range of issues and themes and introduces papers of six authors/author teams. The introductory paper is divided into three sections: what is graduate entrepreneurship; entrepreneurial intentions; and education and training.Findings – The paper finds that, despite increasing attention on graduate entrepreneurship, there remains a lack of research on entrepreneurial intentions and enterprise/entrepreneurship education and training in varied and multiple contexts. This special issue includes research from a number of countries, including England, Ireland, Australia and the USA.Originality/value – The paper provides the basis for a more nuanced understanding of entrepreneurial intentions and related education and training – of interest to both researchers and policy makers in te...

A Review of Uncertainties in Global Temperature Projections over the Twenty-First Century

Abstract: Quantification of the uncertainties in future climate projections is crucial for the implementation of climate policies. Here a review of projections of global temperature change over the twenty-first century is provided for the six illustrative emission scenarios from the Special Report on Emissions Scenarios (SRES) that assume no policy intervention, based on the latest generation of coupled general circulation models, climate models of intermediate complexity, and simple models, and uncertainty ranges and probabilistic projections from various published methods and models are assessed. Despite substantial improvements in climate models, projections for given scenarios on average have not changed much in recent years. Recent progress has, however, increased the confidence in uncertainty estimates and now allows a better separation of the uncertainties introduced by scenarios, physical feedbacks, carbon cycle, and structural uncertainty. Projection uncertainties are now constrained by observations and therefore consistent with past observed trends and patterns. Future trends in global temperature resulting from anthropogenic forcing over the next few decades are found to be comparably well constrained. Uncertainties for projections on the century time scale, when accounting for structural and feedback uncertainties, are larger than captured in single models or methods. This is due to differences in the models, the sources of uncertainty taken into account, the type of observational constraints used, and the statistical assumptions made. It is shown that as an approximation, the relative uncertainty range for projected warming in 2100 is the same for all scenarios. Inclusion of uncertainties in carbon cycle–climate feedbacks extends the upper bound of the uncertainty range by more than the lower bound.

Estimating bird abundance : making methods work

Abstract: Summary In many bird monitoring surveys, no attempt is made to estimate bird densities or abundance. Instead, counts of one form or another are made, and these are assumed to correlate with bird density. Unless complete counts on sample plots are feasible, this approach can easily lead to false conclusions, because detectability of birds varies by species, habitat, observer and many other factors. Trends in time of counts often reflect trends in detectability, rather than trends in abundance. Conclusions are further compromised when surveys are conducted at unrepresentative sites. We consider how to avoid these problems. We give a brief description of distance sampling methods, which allow detectability to be estimated. We consider strategies to ease their implementation, to enhance their reliability, to adapt the methods for difficult species, and to deal with circumstances in which representative sampling is problematic. We also consider some of the common problems encountered, and suggest solutions.

A neuroscientific review of imagery and observation use in sport.

Abstract: Imagery and observation are multicomponential, involving individual difference characteristics that modify the processes. The authors propose that both imagery and observation function by offering effective routes to access and reinforce neural networks for skilled performance. The neural isomorphism with overt behaviors offers a tempting mechanism to explain the beneficial outcomes of the 2 processes. However, several limitations related to imagery indicate the possibility that imagery may not be as efficacious as the literature would indicate. The authors propose observation-based approaches to offer more valid and effective techniques in sport psychology and motor control.

Progressing the definition of “e‐book”

Abstract: Purpose – This paper aims to propose a definition for the concept “e‐book” on the basis of an analysis of existing definitions. The e‐book marketplace is growing rapidly and the potential impact of e‐books on publishers, librarian and users is increasing in significance. Yet, there is agreement that despite a few widely accepted definitions there is no consensus on the definition of the term e‐book, and, further that consensus on the definition would be beneficial for both researchers and practitioners.Design/methodology/approach – This paper starts with a brief overview of the developments in e‐books, covering technologies, marketplaces, and the attractions and challenges associated with e‐books for users and libraries. It then reports on a content analysis of existing definitions of e‐book. A collection of definitions was compiled through an exhaustive literature review. Content analysis was performed to identify the frequency of occurrence of key words and phrases across these definitions.Findings – Th...

Similarity of polygenic profiles limits the potential for elite human physical performance

Abstract: Human physical capability is influenced by many environmental and genetic factors, and it is generally accepted that physical capability phenotypes are highly polygenic. However, the ways in which relevant polymorphisms combine to influence the physical capability of individuals and populations are unknown. Initially, the literature was searched to identify associations between 23 genetic polymorphisms and human endurance phenotypes. Next, typical genotype frequencies of those polymorphisms in the general population were obtained from suitable literature. Using probability calculations, we found only a 0.0005% chance of a single individual in the world having the 'preferable' form of all 23 polymorphisms. As the number of DNA variants shown to be associated with human endurance phenotypes continues to increase, the probability of any single individual possessing the 'preferable' form of each polymorphism will become even lower. However, with population turnover, the chance of such genetically gifted individuals existing increases. To examine the polygenic endurance potential of a human population, a 'total genotype score' (for the 23 polymorphisms) was calculated for each individual within a hypothetical population of 1000 000. There was considerable homogeneity in terms of genetic predisposition to high endurance potential, with 99% of people differing by no more than seven genotypes from the typical profile. Consequently, with population turnover world and Olympic records should improve even without further enhancement of environmental factors, as more 'advantageous' polygenic profiles occasionally, though rarely, emerge. More broadly, human potential appears limited by the similarity of polygenic profiles at both the 'elite sport' and 'chronic disorder' ends of the performance continuum.

How Effective Are Fiscal Incentives to Attract FDI to Sub-Saharan Africa?

Abstract: Given the role of foreign direct investment in the development process, one of the most important challenges facing Africa is how to attract foreign direct investment. A number of attempts have been made, but most have been unsuccessful because of various factors that work against the business environment for foreign investment. This paper analyses the impact of fiscal incentives, the most popular instrument, for attracting foreign investment to Sub-Saharan Africa. It uses cross-sectional time series data on 16 Sub-Saharan African countries, and an econometric model of three proxies of fiscal incentive, after controlling for traditional and other policy variables. The results show that traditional variables and government policies to attract foreign investment to Africa are important. Of the fiscal incentives, tax holidays seem to be the most significant. What could also be important are political and macroeconomic stability at the national and regional levels, property rights protection and other investment-supporting regulations and improvements in infrastructure and service support systems.

Effect of 5 weeks horizontal bed rest on human muscle thickness and architecture of weight bearing and non-weight bearing muscles

Abstract: The aim of the present study was to investigate the changes in thickness, fascicle length (L f) and pennation angle (θ) of the antigravity gastrocnemius medialis (GM) and vastus lateralis (VL) muscles, and the non-antigravity tibialis anterior (TA) and biceps brachii (BB) muscles measured by ultrasonography in ten healthy males (aged 22.3 ± 2.2 years) in response to 5 weeks of horizontal bed rest (BR). After BR, muscle thickness decreased by 12.2 ± 8.8% (P < 0.05) and 8.0 ± 9.1% (P < 0.005) in the GM and VL, respectively. No changes were observed in the TA and BB muscles. L f and θ decreased by 4.8 ± 5.0% (P < 0.05) and 14.3 ± 6.8% (P < 0.005) in the GM and by 5.9 ± 5.3% (P < 0.05) and 13.5 ± 16.2% (P < 0.005) in the VL, again without any changes in the TA and BB muscles. The finding that amongst the antigravity muscles of the lower limbs, the GM deteriorated to a greater extent than the VL is possibly related to the differences in relative load that this muscle normally experiences during daily loading. The dissimilar response in antigravity and non-antigravity muscles to unloading likely reflects differences in loading under normal conditions. The significant structural alterations of the GM and VL muscles highlight the rapid remodelling of muscle architecture occurring with disuse.

Whole muscle contractile parameters and thickness loss during 35-day bed rest

Abstract: Extended exposure to microgravity leads to significant musculoskeletal adaptations. Contractile parameters of four skeletal muscles (biceps brachii–BB, vastus medialis–VM, biceps femoris–BF and gastrocnemius medialis–GM) were measured in ten healthy males (aged 22.3 ± 2.2 years) during 35 days of horizontal bed rest by a mechanomyography-based method termed ‘tensiomyography’ (TMG). Two contractile parameters: contraction time (Tc) and maximal displacement (Dm) were individually measured from electrically evoked maximal single twitch TMG response of all four muscles before and after bed rest. Significant changes in Tc were found after bed rest, as shown by an increase in GM muscle Tc by 18% (p < 0.01). Dm values significantly increased (p < 0.01) after bed rest, by 24, 26 and 30% in the VM, BF and GM muscles, respectively. In the GM, the change in Dm significantly correlated with the decrease in muscle thickness (r = −0.70, p < 0.01). In conclusion, bed rest induced changes in both Dm and Tc of the TMG signal; changes in Dm being inversely related to those of muscle thickness. Amongst the investigated muscles, most affected, in terms of atrophy and mechanical alterations, were those of the lower limbs. The observed increase in Dm may be attributed to a decrease in muscle, as well as tendon stiffness, causing larger muscle fibre and non-contractile tissue oscillations following contraction.

Ageing of human muscles and tendons.

Abstract: At whole muscle level, the reduction in intrinsic force observed with ageing is probably the result of the combined effect of changes in: (i) muscle architecture, (ii) tendon mechanical properties, (iii) neural drive (reduced agonist and increased antagonist muscles' activity), and (iv) single fibre specific tension. Only recently have alterations in muscle architecture and in tendon mechanical properties been shown to contribute to the reduction in intrinsic muscle force, and tendon stiffness changes play an important role. Of note is the fact that most of these changes may be reversed by 14 weeks of resistive training, for both fibre fascicle length and tendon stiffness were found to be increased by 10% and 64%, respectively. Surprisingly, however, training had no effect on the estimated relative length-tension properties of the muscle, indicating that the effects of increased tendon stiffness and increased fascicle length cancelled out each other. It seems that natural strategies may be in place to ensure that the relative operating range of muscle remains unaltered by changes in physical activity, and perhaps age.

Carbonate budgets and reef production states: a geomorphic perspective on the ecological phase-shift concept

Abstract: Recent, region-scale estimates suggest that high levels of coral cover loss have occurred in both the Caribbean and Indo-PaciWc reef provinces (Gardner et al. 2003; Bruno and Selig 2007), and that some 60–70% of coral communities globally are directly threatened by anthropogenic activities (Wilkinson 1996; Hoegh-Guldberg 1999; Goreau et al. 2000). The ecological changes that have resulted from these disturbances have been widely discussed in terms of coral reef ‘health’ and resilience (Hughes et al. 2003; Bellwood et al. 2004) and often aligned with the ecological phase-shift concept originally outlined by Done (1992). A phase shift, in the context of a coral reef, has been deWned as a transition in the ecological state of the reef to conditions of low coral cover and persistent high Xeshy macroalgal cover (Done 1992; McManus and Polsenberg 2004). Whilst episodic natural disturbance events can be important drivers of such ecological transitions, a variety of both direct and indirect anthropogenic disturbances are also widely implicated (Done 1999). Such disturbances might modify natural reef processes, either by altering the ecological balance within individual reef systems (Jackson 1997; Jackson et al. 2001) or the environmental conditions under which reef growth occurs (Kleypas et al. 1999). Whilst earlier concerns over passive reef ‘drowning’ in response to greatly accelerated sea-level rise (e.g. Buddemeier and Smith 1988) have not been maintained (Spencer 1995), there remains considerable concern as to how more modest rates of sea-level rise, alongside climate change-related shifts in chronic stress from changing ocean temperatures and ocean chemistry, may lead to damage acute events occurring at ever more frequent intervals (e.g. Hoegh-Guldberg et al. 2007). The implications for reefs: as geomorphic structures, in terms of the extent of reef framework development and in terms of net carbonate accumulation (Edinger et al. 2000); the geomorphic integrity of reef associated sedimentary landforms; and the ecological eVects, in terms of changes in reef community structures (Chadwick-Furman 1996; Harvell et al. 2002; Hughes et al. 2003; Hoegh-Guldberg et al. 2007) remain, however, unclear. In the scientiWc literature, much of the discussion about the eVects of such ecological and environmental change has focused on quantifying the impacts upon coral communities, especially in terms of monitoring changes in coral cover and diversity, and in coral community structure. Central to many such discussions has been the issue of variations in the relative abundance of corals and macroalgae Communicated by Geology Editor Dr Bernhard Riegl

State anxiety and visual attention: The role of the quiet eye period in aiming to a far target

Abstract: In this study, we examined how individuals controlled their gaze behaviour during execution of a far aiming task and whether the functional relationship between perception and action was disrupted by increased anxiety. Twenty participants were trained on a simulated archery task, using a joystick to aim and shoot arrows at the target, and then competed in two counterbalanced experimental conditions designed to manipulate the anxiety they experienced. The specific gaze behaviour measured was the duration of the quiet eye period. As predicted, accuracy was affected by the duration of the quiet eye period, with longer quiet eye periods being associated with better performance. The manipulation of anxiety resulted in reductions in the duration of quiet eye. Our results show that the quiet eye period is sensitive to increases in anxiety and may be a useful index of the efficiency of visual orientation in aiming tasks.

The rate of muscle temperature increase during acute whole-body vibration exercise

Abstract: This study compared the rate of muscle temperature (T m) increase during acute whole-body vibration (WBV), to that of stationary cycling and passive warm-up. Additionally we wanted to determine if the purported increase in counter-movement jump and peak power cycling from acute WBV could be explained by changes in muscle temperature. Eight active participants volunteered for the study, which involved a rest period of 30 min to collect baseline measures of muscle, core, skin temperature, heart rate (HR), and thermal leg sensation (TLS), which was followed by three vertical jumps and 5 s maximal cycle performance test. A second rest period of 40 min was enforced followed by the intervention and performance tests. The change in T m elicited during cycling was matched in the hot bath and WBV interventions. Therefore cycling was performed first, proceeded by, in a random order of hot bath and acute WBV. The rate of T m was significantly greater (P < 0.001) during acute WBV (0.30°C min−1) compared to cycle (0.15°C min−1) and hot bath (0.09°C min−1) however there was no difference between the cycle and hot bath, and the metabolic rate was the same in cycling and WBV (19 mL kg−1 min−1). All three interventions showed a significant (P < 0.001) increase in countermovement jump peak power and height. For the 5 s maximal cycle test (MIC) there were no significant differences in peak power between the three interventions. In conclusion, acute WBV elevates T m more quickly than traditional forms of cycling and passive warm-up. Given that all three warm-up methods yielded the same increase in peak power output, we propose that the main effect is caused by the increase in T m.

Are Tropical Streams Ecologically Different from Temperate Streams

Abstract: If tropical streams differ ecologically from temperate ones, we must be cautious in our extrapolation of ecosystem models developed in temperate-zone streams. Similarly, approaches and techniques used routinely in management of temperate streams may not be applicable in the tropics. Despite considerable variability in geological history, flow regime and geomorphology, streams in the tropics typically receive higher insolation and more intense rainfall, with warmer water and often relatively predictable floods. For many groups of aquatic taxa, tropical streams also harbour higher biodiversity than their temperate equivalents. Nonetheless, there is little published evidence for consistent differences in food-web structure, productivity, organic-matter processing and nutrient dynamics, or responses to disturbance which would indicate that the term 'tropical' has special significance when applied to stream ecology. Instead, ecological processes in tropical streams appear to be driven by the same variables that are important in temperate ones. For example, biotic responses to drought and flooding are similar to those in temperate streams while in-stream productivity is limited by the same factors: nutrients, shading, disturbance, and trophic structure. Shredders are reputed to be rare in many tropical streams but this also is the case in many southern temperate streams, implying that models of leaf breakdown developed in the north-temperate zone may not have the universal applicability often assumed. Biome comparisons among temperate and tropical streams are confounded by the immense inherent variability of streams within both these zones, and the wide range of climatic and hydrological conditions - even in the tropics. Valid extrapolation of models and management strategies may be less a matter of tropical versus temperate streams but, instead, of ensuring comparability at appropriate scales and fuller understanding of ecological mechanisms, plus recognition of the magnitude and complexity of spatial and temporal variation in stream ecosystems at all latitudes.

Developments: Child, Image, Nation

Abstract: How does developmental psychology connect with the developing world? What do cultural representations tell us about the contemporary politics of childhood? What is the political economy of childhood? This companion volume to Burman's Deconstructing Developmental Psychology helps us to explain why questions around children and childhood - their safety, their sexuality, their interests and abilities, their violence - have so preoccupied the late twentieth and twenty-first centuries In this increasingly post-industrial, post-colonial and multicultural world, this book identifies analytical and practical strategies for improving how we think about and work with children Drawing in particular on feminist and postdevelopment literatures, the book illustrates how and why reconceptualising our notions of individual and human development, including those informing models of children's rights and interests, will foster more just and equitable forms of professional practice with children and their families The book brings together completely new, previously unpublished material alongside revised and updated papers to present a cutting-edge and integrated perspective to the field Burman offers a key contribution to a set of urgent debates engaging theory and method, policy and practice across all the disciplines that work with, or lay claim to, children's interests Developments presents a coherent and persuasive set of arguments about childhood, culture and professional practice so that the sustained focus across a range of disciplinary arenas (psychology, education, cultural studies, child rights, gender studies, development policy and practice, social policy) strengthens the overall argument of each chapter