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Specialisation
Kinds of Specialisation Selected AbstractsHierarchy and Specialisation: on the institutional integration of higher education systems1EUROPEAN JOURNAL OF EDUCATION, Issue 4 2003Ivar Bleiklie First page of article [source] An Empirical Investigation of Price Competition and Industry Specialisation in NHS Audit ServicesFINANCIAL ACCOUNTABILITY & MANAGEMENT, Issue 2 2005Ilias G. Basioudis The NHS audit market is regulated by the Audit Commission (AC) and has unique features. We develop a model for audit fees that includes rigorous analysis of the type of auditor. Poor financial standing does not give rise to higher audit fees. Despite regulation the study supports the existence of a Big Five price premium on the audit fee, but only one firm has a premium. We found no premium due to industry specialisation. The removal of performance audit from AC regulation will require improved audit fee reporting and control. [source] The influence of scale and patchiness on spider diversity in a semi-arid environmentECOGRAPHY, Issue 4 2002Mary E. A. Whitehouse Semi-arid scrubland in the Middle East consists of a soil crust matrix overlain with patches of perennial shrubs. To understand factors influencing biodiversity in this vulnerable landscape we need to understand how this mosaic of habitats influences associated fauna. Spiders are particularly abundant in this habitat so we asked if spider diversity differed between habitat patches and if different patch types contained either a subset of the regional species pool or specific species guilds. We also asked whether changes in the fractal nature of the microphytic and macrophytic patch mosaic altered spider diversity in this habitat. We found that the semi-arid scrubland at Sayeret Shaked Park (Israel) contains different spider communities that require patches of a certain quality to develop fully. Different patch types contain communities of different species, but the community structure of the patches is similar. We suggest that large-scale environmental factors typical of the site as a whole influence coarse-grained community structure, while small-scale differences between patch types result in the specialisation of species to different patch types. [source] Body size and host range in European HeteropteraECOGRAPHY, Issue 1 2000Martin Brändle We used data on body size and host range of phytophagous Heteroptera in central Europe, an inverse measure of specialisation, to analyse the relationship of body size vs specialisation: 1) we found a clear positive relationship between body size and host range using species as independent data points. 2) However, a nested analysis of variance shows that most of the variance in body size occurred at higher taxonomic levels whereas most of the variance in host specialisation occurred between species. This suggests different phylogenetic inertia of body size and specialisation. Nevertheless, using means of different higher taxonomic levels there is still a significant positive correlation between body size and host range. 3) With more sophisticated methods of correcting for the phylogenetic relatedness between species, the positive correlation between body size and host range still holds, despite the different assumptions of each method. Thus, the relationship between body size and host range is a very robust pattern in true bugs. [source] Life-history strategy in an oligophagous tephritid: the tomato fruit fly, Neoceratitis cyanescensECOLOGICAL ENTOMOLOGY, Issue 4 2008THIERRY BRÉVAULT Abstract 1.,In phytophagous insects, life-history traits mainly depend on host plant range. Substantial longevity, high fecundity and larval competition are the major traits of polyphagous Tephritidae while species with a restricted host range generally exhibit a lower longevity and fecundity as well as mechanisms to avoid larval competition. Our aim in this study was to investigate the life history of an oligophagous species, the tomato fruit fly, Neoceratitis cyanescens (Bezzi). 2.,We determined life tables under laboratory conditions in order to calculate the main demographic parameters of N. cyanescens and studied the influence of larval and adult diet on life-history traits. 3.,The mean longevity of N. cyanescens females was 40 days. There was a strong synchronisation of female maturity. Oviposition showed an early peak at 9,13 days after a short pre-oviposition period (6 days). The absence of proteins in the adult diet both delayed ovarian maturation and decreased female fecundity. In addition, females originating from tomato fruits produced significantly more eggs than females originating from bugweed or black nightshade, showing that even the larval host plant may strongly affect the subsequent fecundity of adult females. 4.,The traits of N. cyanescens are then discussed in the light of those documented for polyphagous and monophagous tephritids. Neoceratitis cyanescens displayed attributes intermediate between those of polyphagous and monophagous tephritids. Its smaller clutch size compared with polyphagous species and its specialisation on the Solanaceae family whose fruits contain toxic compounds may help in reducing intra- and inter-specific competition, respectively. [source] Genetic divergence and ecological specialisation of seed weevils (Exapion spp.) on gorses (Ulex spp.)ECOLOGICAL ENTOMOLOGY, Issue 3 2008MYRIAM BARAT Abstract 1.,Reproductive isolation of sympatric populations may result from divergent selection of populations in different environments, and lead to ecological specialisation. In Brittany (France), the gorse Ulex europaeus (Fabaceae, Genisteae), may be encountered in sympatry with one of the two other gorse species present: U. gallii and U. minor. A recent study based on morphological identification of seed predators of gorse has shown that two weevil species (Curculionoidea, Apionidae) infest gorse pods at different seasons and have different host ranges: Exapion ulicis infests U. europaeus in spring, whereas E. lemovicinum infests U. gallii and U. minor in autumn. Weevil populations may thus have diverged in sympatry. 2.,As morphological identification of weevils is often difficult and some of the characters used may exhibit individual or environmental variation, mitochondrial and nuclear sequences of weevils collected within pods of the three gorse species in 10 populations of Brittany were used to reconstruct their phylogeny. 3.,The results reveal that species differentiation based on morphological characters is confirmed by the two molecular data sets, showing that E. ulicis and E. lemovicinum are distinct species, and suggesting the absence of host races. Finally, E. ulicis was able to use U. gallii and U. minor pods in spring in some years in some populations, which appeared to depend on the availability of pods present during its reproductive period. 4.,Divergence between E. ulicis and E. lemovicinum may have resulted from temporal isolation of reproductive periods of weevil populations followed by specialisation of insects to host phenology. [source] Variation among individual butterflies along a generalist,specialist axis: no support for the ,neural constraint' hypothesisECOLOGICAL ENTOMOLOGY, Issue 3 2007BRIAN WEE Abstract 1.,Degree of host specialisation was a continuous variable in a population of Edith's checkerspot butterfly (Euphydryas editha). A novel host, Collinsia torreyi, had been added to the diet in response to anthropogenic disturbance, and then abandoned prior to the current study. Butterflies either showed no preference or preferred their traditional host, Pedicularis semibarbata. 2.,Strength of preference for Pedicularis over Collinsia was measured in the field and used to estimate host specialisation of individual butterflies. Efficiency was estimated from the times taken by each insect to perform two tasks: (i) identification of a Pedicularis plant as a host, and (ii) successful initiation of oviposition after the decision to do so had been made. 3.,There was no clear trend for association between host specialisation and either measure of efficiency. Generalists were not slower than specialists at identifying Pedicularis as a host or at handling it after deciding to oviposit. 4.,Prior work indicated that generalists paid no detectable cost in terms of reduced discrimination among individuals of their preferred host species. 5.,In contrast to other species, generalist E. editha paid in neither time nor accuracy. Why then does the diet not expand? Behavioural adaptations to the traditional host caused maladaptations to the novel host and generated short-term constraints to evolutionary expansion of diet breadth. To date, however, no long-term constraints have been found in this system. In those traits investigated to date, increased adaptation to the novel host has not caused reduced adaptation to the traditional host. [source] Spatial and temporal organisation of the pre-dispersal seed predator guild in a perennial legume, Vicia tenuifoliaECOLOGICAL ENTOMOLOGY, Issue 2 2006Árpád Szentesi Abstract., 1. The variability of species combinations and membership assembly patterns in an insect pre-dispersal seed predator guild were studied at various spatial and temporal resolutions using presence/absence and abundance data in null models. The guild consists of seven beetle species (four bruchids and three curculionids) and one moth species that live on a perennial vetch, Vicia tenuifolia Roth (Leguminosae). 2. The seed predator guild varied considerably in the number of members and species combinations in space and time, and, contrary to expectations, there was no evidence of interspecific competition among guild members, supporting the view that other processes, including chance events, could contribute to guild formation. 3. It is concluded that, apart from the possibility of stochastic co-occurrence, it is the narrow host specialisation that constrains seed predator members to participate in the guild, and small differences in habitat preference can also lead to spatial and temporal variation. [source] "Offshoring": How big an issue?ECONOMIC OUTLOOK, Issue 3 2004Grant Colquhoun Spurred by the political debate in the US and several high-profile corporate moves, "offshoring" has become a lively topic of discussion. This paper by Grant Colquhoun, Keith Edmonds and David Goodger tries to put recent developments in context and argues that "offshoring" should be seen as part of a long-standing and largely beneficial trend of international specialisation. In the short term at least, the transfer of service sector activities abroad is likely to involve relatively small numbers of jobs when compared to overall UK employment and labour market turnover. However, specific areas , such as call centres, back office functions and software programming , are expected to be increasingly affected, impacting upon regions of the UK with heavy exposure to those activities and giving rise to adjustment costs. In contrast, retailing, hotels and catering and personal services could well benefit from the move of low value-added jobs abroad. Overall, the impact of "offshoring" on the UK economy in terms of output and productivity should be positive. [source] COMPARATIVE ADVANTAGE AND AUSTRALIA-CHINA BILATERAL TRADEECONOMIC PAPERS: A JOURNAL OF APPLIED ECONOMICS AND POLICY, Issue 1 2008YU SHENG Bilateral trade between Australia and China has expanded in recent years. This paper examines the determinants of bilateral trade at the two-digit commodity level using a modified gravity model with explicitly specified revealed comparative advantage incorporated. This methodology allows us to explore how the relative comparative advantage of Australia and China to the world, mirroring their individual pattern of factor endowments, affects the pattern of trade between the two countries and to identify whether there exists a kind of complimentarity international specialisation between the two countries against the backdrop of each country's booming trade with the rest of the world. Key commodities such as agricultural products, iron ore, petroleum, textiles and clothing, and machinery goods are considered to estimate net welfare in terms of added value deriving from bilateral trade. The findings have policy implications for forging future trade and economic cooperation between Australia and China. [source] Career choice and attitudes towards dental education amongst dental students in Japan and SwedenEUROPEAN JOURNAL OF DENTAL EDUCATION, Issue 2 2009H. Karibe Abstract The purpose of this study was to identify and compare the perspectives of dental students towards their career choice and dental education in Japan and Sweden. One hundred and fourteen dental students from the Nippon Dental University, Japan and 43 dental students from the Karolinska Institutet, Sweden participated in this study. Information was derived from a self-answered questionnaire consisting of five items for career choice and six items for dental education. Chi-square test and Wilcoxon signed-rank test were used for comparison. Significant differences were detected for 10 questionnaire items between the two countries. Regarding motivation towards the career choice, 44% of Swedish students indicated interpersonal motives related to helping other people, whereas 32% of Japanese students indicated expectations of their family in the dental profession. As future career options, 64% of Japanese and 47% of Swedish students planned to work as general dentists. More Swedish students (37%) preferred specialisation than Japanese students (17%). Nearly three-quarters of the Swedish students were satisfied with the teaching faculty of their school, whilst only 32% of the Japanese students indicated content. The perspectives of dental students were different in Japan and Sweden. This study provides a description of the perspectives of Japanese and Swedish dental students and enables better understanding of career decision and dental curriculum issues. [source] An Empirical Investigation of Price Competition and Industry Specialisation in NHS Audit ServicesFINANCIAL ACCOUNTABILITY & MANAGEMENT, Issue 2 2005Ilias G. Basioudis The NHS audit market is regulated by the Audit Commission (AC) and has unique features. We develop a model for audit fees that includes rigorous analysis of the type of auditor. Poor financial standing does not give rise to higher audit fees. Despite regulation the study supports the existence of a Big Five price premium on the audit fee, but only one firm has a premium. We found no premium due to industry specialisation. The removal of performance audit from AC regulation will require improved audit fee reporting and control. [source] Assessing biotic integrity in a Mediterranean watershed: development and evaluation of a fish-based indexFISHERIES MANAGEMENT & ECOLOGY, Issue 4 2008M. F. MAGALHÃES Abstract, Biological indicators for Mediterranean rivers are poorly developed. This study evaluates the effectiveness of the Index of Biotic Integrity approach (IBI) with fish assemblages in the Guadiana catchment, a typical Mediterranean watershed in Southern Portugal. Reference sites were selected from a set of 95 sites, using a multivariate approach. Fifty-five candidate metrics were screened for range, responsiveness, precision and redundancy. Final metrics included: proportion of native fish, number of intolerant and intermediate species, number of invertivore native fish, number of phyto-lithophilic and polyphilic species, and catches of exotics. The IBI scores correlated with composite gradients of human impact and differed significantly between reference and non-reference sites. Application of the IBI to an independent validation set with 123 sites produced results congruent with the development set and repeatable assessments at 22 sites showed concordance in IBI scoring. This application highlights the effectiveness of the IBI approach even with fish assemblages of limited diversity and ecological specialisation as in Mediterranean streams. [source] Groundwater biodiversity patterns in the Lessinian Massif of northern ItalyFRESHWATER BIOLOGY, Issue 4 2009DIANA M. P. GALASSI Summary 1. The distribution patterns of stygobiotic invertebrates were examined with a stratified sampling design at 197 sites selected among four hydrogeographic basins in the Lessinian Massif (northern Italy). The sites were approximately evenly distributed among four hydrogeological zones: unsaturated and saturated zone of karstic aquifers, and hyporheic and saturated zone of porous aquifers. 2. Outlying Mean Index (OMI) analysis which assesses deviation of habitat conditions from reference conditions, was used to evaluate the importance of 14 selected environmental variables in shaping groundwater biodiversity patterns in the region (total of 89 stygobiotic species). The measured variables explained 80% of the variability in the data set. 3. Sampling sites were distributed along the environmental gradients defined by OMI analysis. Significant differences were detected between karstic and porous site, as well as among sites located in the four hydrogeological zones. Differences among the four hydrogeographic basins were not observed. 4. Ordination of stygobiotic species along the environmental gradients was best explained by historical variables (mainly Würmian glaciation and age of the underlying geological formation), while variables related to hydrogeology (mainly pH, calcium concentration and habitat fragmentation) influenced species distributions in the hydrogeological zones. An Environmental Integrity Index and nitrate concentration were significantly correlated with altitude, but appeared not to play a significant role in determining stygobiotic biodiversity patterns at the regional scale. 5. Results of the OMI analysis were highly significant for all taxa, suggesting that stygobiotic species are sensitive to the environmental factors studied. Thirty-five species showed high habitat specialisation (OMI index > 10). These species were usually rare and endemic to the Lessinian Massif. Most of them were found in a single hydrogeological zone. 6. Quaternary glaciations appear not to have lowered stygobiotic species richness in the Lessinian Massif. This may be because of the marginal location of the region with respect to the Würmian glacier limit and because of extensive networks of fractures in the vadose zone of the karst, which may have allowed stygobionts to move deep down in the aquifers to seek refuge during surface freezing and to recolonise ancestral habitats after the glaciers retreated. [source] Ferox Trout (Salmo trutta) as `Russian dolls': complementary gut content and stable isotope analyses of the Loch Ness foodwebFRESHWATER BIOLOGY, Issue 7 2002J. GREY 1.,Conventional collection methods for pelagic fish species (netting, trawling) are impractical or prohibited in Loch Ness, U.K. To investigate trophic relationships at the top of the Loch Ness food web, an alternative strategy, angling, provided samples of the top predator, the purely piscivorous ferox trout (Salmo trutta). 2.,The gut contents of these fish provided further samples of prey-fish, and subsequent examination of prey-fish guts revealed their dietary intake, analogous to the famous nested `Russian dolls'. Each trophic level separated by gut content analysis provided further complementary samples for stable isotope analysis and thus information on the longer term, assimilated diet. 3.,Ferox trout exhibited considerable cannibalism to supplement a diet of Arctic charr (Salvelinus alpinus). However, conspecifics stemmed from a lower isotopic baseline in relation to charr, so ferox trout exhibited a lower trophic level than predicted (4.3) by using the ,15N values. Charr displayed dietary specialisation with increasing length, and isotopic values supported by the gut data placed the charr at a trophic level of 3.5. The isotope data also indicated that charr carbon was primarily autochthonous in origin. [source] The biology and ecology of lotic microturbellariansFRESHWATER BIOLOGY, Issue 1 2000Jurek Kolasa Summary 1More than 200 known species of Microturbellaria occur in running waters world-wide but discovery of many more is likely. Their population density varies greatly as a function of substratum, productivity, phenology and hydrology. The density may exceed 7 000 individuals m -2. The number of species in a single small sample may reach 20. 2Many species appear to have microhabitat or stream section specialisation but community patterns are obscured to a certain extent by common and eurytopic species. The specialisation is particularly evident in the smaller, lower-order streams. 3Some of this habitat specialisation is attributable to the ecological origin of species that may include terrestrial, underground, marine and lentic species pools. 4Feeding habits of Microturbellaria range from omnivory to specialised predation. 5Quantitative field studies require extraction and examination of live specimens from samples. Such samples pose transportation and storage problems and must be processed within hours of collection. 6Taxonomy is well resolved for the Northern Hemisphere but is likely to be a major challenge in other parts of the world. In any region, however, new species may demand caution while using current keys to their identification. [source] Evaluating the impact of a cancer supportive care project in the community: patient and professional configurations of needHEALTH & SOCIAL CARE IN THE COMMUNITY, Issue 6 2007Kristian Pollock PhD MA PGCHE Abstract Advances in cancer care and treatment have created a new and somewhat anomalous category of patients with a diagnosis of non-curative disease who still have a considerable period of life remaining. During much of this time they may remain relatively well, without manifest need for clinical care. The responses of patients to this challenging situation are largely unknown. However, it has been assumed that because they confront a difficult experience they will need, or can benefit from, professional intervention. The implementation of pre-emptive support measures is anticipated to improve patients' resilience in coping with their illness and approaching death. This study aimed to investigate the impact of the keyworker role in a 3-year cancer supportive community care project to identify and provide for the needs of patients with a diagnosis of non-curative cancer. It was a qualitative study incorporating face-to-face interviews and focus groups with 19 healthcare professionals and 25 patients and carers from an urban East Midlands locality and a thematic analysis of qualitative interview and focus group transcripts. The project was positively evaluated by patients, carers and professionals. However, the findings raised questions about the different configuration of ,need' within the lay and professional perspectives and how this should most appropriately be addressed. In contrast to widespread professional assumptions about patients' need for counselling, many patients preferred to turn to their friends and families for support, and to adopt a stance of emotional and personal self-reliance as a strategy for coping with their predicament. The study highlights the continuing orientation of services around professional, rather than patient, agendas and the momentum towards increasing specialisation of professional roles and the medicalisation of everyday life that flows from this. [source] The Unfolding Trends and Consequences of Expanding Higher Education in Ethiopia: Massive Universities, Massive ChallengesHIGHER EDUCATION QUARTERLY, Issue 1 2009Kedir Assefa Tessema Abstract There have been significant increases in the number of universities and student enrollments in the last fifteen years in Ethiopia. The numerical gains have brought about improved access to higher education for students. The expansion has also diversified fields of study and opened opportunities to pursue higher degrees to a significant number of students. Furthermore, the opportunity created for the university staff includes increased university job security, positions in the university leadership and scholarships for PhD degrees. On the other hand, the downside effects of the massification have worsened the conditions of university teaching staff. Among others, it has resulted in increasing work load and extended work schedules for academic staff. A managerialist culture has evolved that measures teaching against instrumental outcomes. There is a sense of deprofessionalisation and deskilling among staff manifested in practices that are disconnections from professional knowledge, skills and attitudes. As staff are increasingly over-engaged, by taking more weekly class hours and managerial responsibilities, less ,down time' is available to keeping with developments in their fields of specialisation and practice [source] The future role of the Scandinavian anaesthesiologist: a web-based surveyACTA ANAESTHESIOLOGICA SCANDINAVICA, Issue 9 2010A. ÅNEMAN Background: The Board of the Scandinavian Society for Anaesthesiology and Intensive Care Medicine (SSAI) decided in 2008 to undertake a survey among members of the SSAI aiming at exploring some key points of training, professional activities and definitions of the specialty. Methods: A web-based questionnaire was used to capture core data on workforce demographics and working patterns together with opinions on definitions for practice/practitioners in the four areas of anaesthesia, intensive care medicine, emergency medicine and pain medicine. Results: One thousand seven hundred and four responses were lodged, representing close to half of the total SSAI membership. The majority of participants reported in excess of 10 years of professional experience in general anaesthesia and intensive care medicine as well as emergency and pain medicine. While no support for separate or secondary specialities in the four areas was reported, a majority of respondents favoured sub-specialisation or recognition of particular medical competencies, notably so for intensive care medicine. Seventy-five percent or more of the respondents supported a common framework of employment within all four areas irrespective of further specialisation. Conclusions: The future of Scandinavian anaesthesiology is likely to involve further specialisation towards particular medical competencies. With such diversification of the workforce, the majority of the respondents still acknowledge the importance of belonging to one organisational body. [source] Do Spanish Firms Change Auditor to Avoid a Qualified Audit Report?INTERNATIONAL JOURNAL OF AUDITING, Issue 1 2003Nieves Gómez-Aguilar In this paper we investigate whether Spanish firms employ deliberate strategies in the choice of auditor to avoid audit qualification. For a sample of 735 during the period 1991,96 we found no increase in the probability of changing auditor following an audit qualification. We concluded that this would be too obvious and detrimental to the firm's interests. However, 135 firms do change auditor during the period examined. We found that firms that have been qualified are significantly less likely to move to higher quality auditors than are unqualified firms, when that quality is measured by the specialisation of the auditor, auditor brand name, auditor size and auditor conservatism. For the 92 qualified firms changing auditor the likelihood of a subsequent qualification is significantly related to the quality of the auditor selected. [source] Functional anatomy and muscle moment arms of the thoracic limb of an elite sprinting athlete: the racing greyhound (Canis familiaris)JOURNAL OF ANATOMY, Issue 4 2008S. B. Williams Abstract We provide quantitative muscle,tendon architecture and geometry data for the racing greyhound thoracic limb. Muscle mass, belly length, fascicle lengths, pennation angles and moment arms were measured, as were tendon masses and lengths. Maximum isometric force and maximum power were estimated for muscles, and maximum stress and strain were estimated for tendons. Results are compared with other fast quadrupedal runners, and to previously published data in mixed-breed dogs. The implications of the functional adaptations of the greyhound thoracic limb for sprinting performance are discussed. The thoracic limb was found to benefit from a similar proportion of locomotor muscle mass to the pelvic limb, suggesting that it may be used to some extent in propulsion, or alternatively that stabilisation is very important in this animal. Extrinsic muscles, especially latissimus dorsi and pectoralis profundus, were predicted to be powerful and important for generating net positive work during accelerations. Proximal biarticular muscles show specialisation toward preventing collapse of the shoulder and elbow joints to enable strut-like limb function, or some form of dynamic control. Distal muscles did not appear specialised for elastic energy storage, a functional difference to pelvic limb muscles, and the equivalents in horse thoracic limbs. The greyhound thoracic limb appears to possess substantial differences from both that of more ,sub-maximal specialist' quadrupeds, and from the greyhound pelvic limb. [source] Reputation and Relevance of Economics JournalsKYKLOS INTERNATIONAL REVIEW OF SOCIAL SCIENCES, Issue 2 2003Michael Bräuninger Summary We analyse the interrelationship between economics journals' relevance and reputation. While reputation and relevance positively affect each other, relevance has a much stronger impact on reputation than reputation on relevance. Citation frequency is a key determinant for both journal reputation and relevance, but effects on journal reputation are nearly twice as strong. Specialised journals are, ceteris paribus, considered less relevant and, therefore, also less reputed, even though specialisation has a positive direct effect on reputation. German-speaking economists find German journals more relevant, but at the same time also less reputed than foreign journals. Age and volume effects are also analysed. [source] Social and organisational implications of CAD usage: a grounded theory in a fashion companyNEW TECHNOLOGY, WORK AND EMPLOYMENT, Issue 2 2004Fabiola Bertolotti This paper focuses on the process of Computer Aided Design (CAD) diffusion into a group engaged in the development of innovative products. Adopting an ethnographic approach, we build a grounded theory for interpreting CAD usage in terms of the interplay between variables such as management orientation, training, actors' specialisation and deskilling, availability of shared archives, technological discontinuities between organisational areas. [source] Differences in habitat quality explain nestedness in a land snail meta-communityOIKOS, Issue 2 2005Kristoffer Hylander We set up two alternative hypotheses on how environmental variables could foster nestedness; one of "nested habitats" and another of "nested habitat quality". The former hypothesis refers to situations where the nestedness of species depends on a nestedness of discrete habitats. The latter considers situations where all species in an assemblage increase in abundance along the same environmental gradient, but differ in specialisation or tolerance. We tested whether litter-dwelling land snails (terrestrial gastropods) in boreal riparian forest exhibited a nested community structure, whether such a pattern was related to differences in environmental variables among sites, and which of the two hypotheses that best could account for the found pattern. We sampled litter from 100 m2 plots in 29 mature riparian forest sites along small streams in the boreal zone of Sweden. The number of snail species varied between 3 and 14 per site. Ranking the species-by-site matrix by PCA scores of the first ordination axis revealed a similarly significant nested pattern as when the matrix was sorted by number of species, showing that the species composition in this meta-community can be properly described as nested. Several environmental variables, most notably pH index, were correlated with the first PCA axis. All but two species had positive eigenvectors in the PCA ordination and the abundance increased considerably along the gradient for most of the species implying that the hypothesis of "nested habitats" was rejected in favour of the "nested habitat quality" hypothesis. Analyses of nestedness have seldom been performed on equal sized plots, and our study shows the importance of understanding that variation in environmental variables among sites can result in nested communities. The conservation implications are different depending on which of our two hypotheses is supported; a conservation focus on species "hotspots" is more appropriate if the communities are nested because of "nested habitat quality". [source] Aphid-mediated coexistence of ladybirds (Coleoptera: Coccinellidae) and the wood ant Formica rufa: seasonal effects, interspecific variability and the evolution of a coccinellid myrmecophile.OIKOS, Issue 2 2000John J. Sloggett It is generally believed that most homopteran-eating insects avoid ant-tended colonies of Homoptera, due to the ant aggression they encounter there. However, because homopteran colonies which are ant-tended often persist for longer than untended colonies, some homopteran-eaters may utilise ant-tended Homoptera when untended colonies are scarce. Furthermore, a few homopteran-eaters are myrmecophilous, habitually coexisting with ants. To investigate these phenomena, a study was made of aphids and aphidophagous coccinellids (ladybirds) on Scots pine, Pinus sylvestris, growing in areas foraged and unforaged by the wood ant Formica rufa. The non-tended aphid Schizolachnus pineti exhibited a marked population decline in late summer but persisted in both areas at very low density. Facultatively tended Cinara aphids exhibited higher population densities when associated with F. rufa, and remaining colonies of these aphids were only found associated with ants in late summer. Coccinellids exhibited considerable interspecific variability in their level of association with F. rufa, and there was some evidence of an increase in certain species' frequencies of occurrence with the ant when Cinara aphids were all ant-tended, in late summer. Coexistence with ants appears to be associated with either an intolerance of low aphid densities, in Coccinella septempunctata and Harmonia quadripunctata, or with extreme dietary specialisation, in Myzia oblongoguttata. Similar factors to those which bring C. septempunctata into contact with ants were probably of importance in the initial stages of the evolution of myrmecophily of its congener, Coccinella magnifica. [source] The new intra-urban dynamics: Suburbanisation and functional specialisation in French cities,PAPERS IN REGIONAL SCIENCE, Issue 1 2002Frédéric Gaschet suburbanisation; functional specialisation; urban subcentres; shift-share analysis; central cities/suburbs relationships Abstract This article examines the relationships between the employment sub-urbanisation from central cities towards their suburbs, and the process of intraurban specialisation that occurred simultaneously in the fifty largest French metropolitan areas. A methodology is proposed to identify urban subcentres and to analyse the effects of the intra-urban specialisations on suburbanisation patterns. We conclude that the specialisation of both subcentres and central cities has a significant effect on suburbanisation rates. Lastly, an intra-metropolitan shift/share analysis provides additional insights into the employment dynamics of central cities and suburbs during the last twenty years. [source] Professionalism and the Millbank Tendency: The Political Sociology of New Labour's EmployeesPOLITICS, Issue 1 2003Paul Webb This article analyses party employees, one of the most under-researched subjects in the study of British political parties. We draw on a blend of quantitative and qualitative data in order to shed light on the social and political profiles of Labour Party staff, and on the question of their professionalisation. The latter theme is developed through a model derived from the sociology of professions. While a relatively limited proportion of party employees conform to the pure ideal-type of professionalism, a considerably greater number manifest enough of the core characteristics of specialisation, commitment, mobility, autonomy and self-regulation to be reasonably described as ,professionals in pursuit of political outcomes'. [source] Can Comparative Advantage Explain the Growth of us Trade?,THE ECONOMIC JOURNAL, Issue 520 2007Alejandro Cuñat We present a dynamic comparative advantage model in which moderate reductions in import tariffs can generate sizable increases in trade volumes over time. A fall in tariffs has two effects. First, for given factor endowments, it raises the degree of specialisation, leading to a larger volume of trade in the short run. Second, it raises the factor price of each country's abundant factor, leading to diverging paths of relative factor endowments and a rising degree of specialisation. A simulation exercise shows that a fall in tariffs produces a disproportional increase in the trade share of output as in the data. [source] Rich and Poor Countries in Neoclassical Trade and GrowthTHE ECONOMIC JOURNAL, Issue 470 2001Alan V. Deardorff A neoclassical growth model provides an explanation for a ,poverty trap', ,club convergence', or ,twin peaks', in terms of specialisation and international trade. The model has many countries with identical linearly homogeneous technologies for producing three goods using capital and labour. With diverse initial endowments, initial equilibrium has unequal factor prices and two diversification cones. With savings out of wages, following Galor (1996), there may easily be multiple steady states. Poor countries converge to a low steady state while rich countries converge to a high one, even though all share identical technological and behavioural parameters. [source] Career Paths and Choices in a Highly Differentiated Profession: The Position of Newly Qualified SolicitorsTHE MODERN LAW REVIEW, Issue 4 2001Andrew Boon Differences in the working lives of solicitors have become increasingly marked in recent years. Growing numbers of lawyers are employed in the public and corporate sectors and, with the increasing size and wealth of City of London commercial firms, there are significant differences between these firms and those ,high-street' firms that serve local communities. These differences impact on lawyers throughout training and beyond, both in terms of rites of passage into the profession and in conditions of employment. This research, the final stage in a longitudinal survey spanning the 1990s, combines quantitative and qualitative methods to explore the reactions of newly qualified solicitors to their work. Building on the project's previous surveys, which charted the nature of disadvantage suffered by many prospective entrants to the legal profession, the research finds a large measure of satisfaction regarding careers. It also identifies causes for concern, including increasing specialisation in legal education and the potential separation of the intrinsic and extrinsic rewards of professional practice. [source] | ||||||||||||||||||||||||||||||||||