Influence of behavioural tactics on recruitment and reproductive trajectory in the kittiwake

Many studies have provided evidence that, in birds, inexperienced breeders have a lower probability of breeding successfully. This is often explained by lack of skills and knowledge, and sometimes late laying dates in the first breeding attempt. There is growing evidence that in many species with deferred reproduction, some prebreeders attend breeding places, acquire territories and form pairs. Several behavioural tactics assumed to be associated with territory acquisition have been described in different species. These tactics may influence the probability of recruiting in the breeding segment of the population, age of first breeding, and reproductive success in the first breeding attempt. Here we addressed the influence of behaviour ('squatting') during the prebreeding period on demographic parameters (survival and recruitment probability) in a long-lived colonial seabird species: the kittiwake. We also investigated the influence of behaviour on reproductive trajectory. Squatters have a higher survival and recruitment probability, and a higher probability of breeding successfully in the first breeding attempt in all age-classes where this category is represented. The influence of behaviour is mainly expressed in the first reproduction. However, there is a relationship between breeding success in the first occasion and subsequent occasions. The influence of breeding success in the first breeding attempt on the rest of the trajectory may indirectly reflect the influence of behaviour on breeding success in the first occasion. The shape of the reproductive trajectory is influenced by behaviour and age of first breeding. There is substantial individual variation from the mean reproductive trajectory, which is accounted for by heterogeneity in performance among individuals in the first attempt, but there is no evidence of individual heterogeneity in the rate of change over time in performance in subsequent breeding occasions     

Influence of behavioural tactics on recruitment and reproductive trajectory in the kittiwake

Many studies have provided evidence that, in birds, inexperienced breeders have a lower probability of breeding successfully. This is often explained by lack of skills and knowledge, and sometimes late laying dates in the first breeding attempt. There is growing evidence that in many species with deferred reproduction, some prebreeders attend breeding places, acquire territories and form pairs. Several behavioural tactics assumed to be associated with territory acquisition have been described in different species. These tactics may influence the probability of recruiting in the breeding segment of the population, age of first breeding, and reproductive success in the first breeding attempt. Here we addressed the influence of behaviour ('squatting') during the prebreeding period on demographic parameters (survival and recruitment probability) in a long-lived colonial seabird species: the kittiwake. We also investigated the influence of behaviour on reproductive trajectory. Squatters have a higher survival and recruitment probability, and a higher probability of breeding successfully in the first breeding attempt in all age-classes where this category is represented. The influence of behaviour is mainly expressed in the first reproduction. However, there is a relationship between breeding success in the first occasion and subsequent occasions. The influence of breeding success in the first breeding attempt on the rest of the trajectory may indirectly reflect the influence of behaviour on breeding success in the first occasion. The shape of the reproductive trajectory is influenced by behaviour and age of first breeding. There is substantial individual variation from the mean reproductive trajectory, which is accounted for by heterogeneity in performance among individuals in the first attempt, but there is no evidence of individual heterogeneity in the rate of change over time in performance in subsequent breeding occasions     

Decision-Making and Informal Political Institutions in Chilean Sub-National Public Investment

Literature on informal political institutions has focused on the national level, disregarding sub-national contexts where one can expect increased informality. This article analyzes locally allocated Chilean public investment to understand how informal institutions affect regional development and local democracy. Based on 59 interviews with key stakeholders and national authorities, this research analyses the flow of the decision-making process on funds for regional investment. The results show that local bureaucrats introduce innovations to cope with the weaknesses of formal decision-making regulations, and that these may become informal institutions that complement or accommodate the process to obtain the outcomes expected under the formal rule.

     

An ergonomics approach to citrus harvest mechanization

Due to the increase of production costs in manual harvesting, strategies must be developed in order to overcome these effects, such as the attempts in implementing agricultural machines in harvest activities, whether being totally or partially mechanized. This study brings a qualitative and quantitative comparison on the impacts in work conditions and productivity in Brazilian orchards caused by the use of semi-mechanized harvesting systems, such as multiplatforms. The results come from the application of Ergonomic Work Analysis method, which focuses in the activity, quantifying and analyzing times and frequencies of the harvesting cycle, as well as the amount of movements. To achieve this, footage, interviews and a stopwatch were used in the observation 12 pickers' work cycles, six for each method of harvesting. The data interpretation pointed to improvement in working conditions with a reduction in the amount of movements performed by the picker, and increase of up to 60% in productivity with the use of semi-mechanized harvesting. Thus, the found results indicate the viability of this harvesting method. However, other variables must be observed in future studies in order to complete the guidelines for a healthy progress in the area of citrus harvesting in Brazil.     

Low wages and high unemployment rates: The role of social interactions in hiring discrimination

The purpose of this paper is to explain why low-wage workers with identical qualifications to higher-wage workers are more exposed to unemployment. Each worker is considered to belong to a social group (defined according to his/her gender, age, and nationality). We assume that workers experience both productive interdependencies and social interactions within the firm. Also inter- and intra-group interactions determine worker productivity, and frictions on the labor market limit the hiring of the most productive workers. Consequently, externalities acting both within the firm and in the labor market can lead to a higher rate of unemployment for low-wage workers.     

The Environmental Consequences of Rural and Urban Population Change: An Exploratory Spatial Panel Study of Forest Cover in the Southern United States, 2001–2006

This exploratory study examines the effects of rural and urban population change on forest cover at the local level across the southern United States. Using county‐level data from the National Land Cover Database and other U.S. government sources, we regressed the total area of forest cover on rural and urban population size in spatial panel models with two‐way fixed effects. When we controlled for several other factors, including the number of forestry operations at the county level, regression results indicate that urban change had no effect, but rural population size was positively related to total forest area, and this effect was most pronounced in and around Georgia. Thus, in areas of the southern United States, rural growth was associated with afforestation, not deforestation. We speculate on how this unusual finding contributes to the debate between ecological modernization and urban political economy implicated in previous cross‐national research.     

Using repeated-prevalence data in multi-state modeling of renal replacement therapy

Multi-state models help predict future numbers of patients requiring specific treatments but these models require exhaustive incidence data. Deriving reliable predictions from repeated-prevalence data would be helpful. A new method to model the number of patients that switch between therapeutic modalities using repeated-prevalence data is presented and illustrated. The parameters and goodness of fit obtained with the new method and repeated-prevalence data were compared to those obtained with the classical method and incidence data. The multi-state model parameters’ confidence intervals obtained with annually collected repeated-prevalence data were wider than those obtained with incidence data and six out of nine pairs of confidence intervals did not overlap. However, most parameters were of the same order of magnitude and the predicted patient distributions among various renal replacement therapies were similar regardless of the type of data used. In the absence of incidence data, a multi-state model can still be successfully built with annually collected repeated-prevalence data to predict the numbers of patients requiring specific treatments. This modeling technique can be extended to other chronic diseases.     

FROM ENTITLEMENT TO OBLIGATION IN THE AUSTRALIAN WELFARE STATE

This article examines recent debates relating to the provision of welfare in Australia. It starts with an assessment of the trend towards the acceptance of the philosophy of ‘mutual obligation’ by governments, commentators and lobby groups, traces the process of the movement of welfare from ‘entitlement’ to ‘obligation’ and argues that this is being used to justify a reworking of the relationship between citizen and state. The paper argues that a ‘genuine’ mutual obligation has always been part of the Australian welfare system and that, in contrast to the current rhetoric of individual responsibility, it should rather be seen as a community based obligation.     

Comparative class analysis: locating Canada in a North American and Nordic context

La division des classes par sexe et par secteur (biens et services capitalistes ou l'état) révele differents points forts dans cinq sociétés capitalistes avancées: les États-Unis, le Canada, la Norvège, la Suede et la Finlande. À l'aide des données tirées du Comparative Class Structure Project (Étude de structure des classes comparée), la présente étude porte sur un ensemble restreint de classes (capitalistes/dirigeants, ancienne classe moyenne, nouvelle classe moyenne et classe ouvrière) déterminées a partir du niveau de maîtrise exercé sur les moyens de production et sur le travail des autres. Elle met en évidence l'mportance de faire une distinction de classes par sexe. Les résultats démontrent comment les hommes et les femmes se répartissent dans la classe ouvrière et la nouvelle classe moyenne dans les divers secteurs des cinq pays étudiés. II en ressort une forte différence entre les pays scandinaves et ceux d'Amérique du Nord. Certaines conséquences pour ce qui est des blocs politiques pour les hommes et les femmes des classes, secteurs et pays en cause sont avancées. Alors que les femmes scandinaves de classe ouvrière et de la nouvelle classe moyenne ont une base solide dans le secteur de l'état, les Nord-américaines, elles, se retrouvent surtout dans le secteur capitaliste des services, beaucoup plus faible. Les hommes de classe ouvrière dominent toujours le secteur capitaliste des biens mais ceux de la nouvelle classe moyenne se divisent par région Scandinavie/Amérique du Nordles Scandinaves de la nouvelle classe moyenne étant plus forts dans le secteur de l'état et leurs équivalents nord-américains étant plus forts dans le secteur capitaliste. Ces tendances suggèrent des bases différentes, selon les pays, pour les alliances politiques entre les classes. Division of classes by sexes and sectors (capitalist goods and services versus the state) reveals different focal points in five advanced capitalist societies: the United States, Canada, Norway, Sweden and Finland. Using data from the Comparative Class Structure Project, this paper offers a ‘minimalist’ set of class categories (capitalist/executive, old middle class, new middle class and worker) based upon commanding the means of production and the labour of power of others. The paper emphasizes the importance of distinguishing classes by sex. The results report on how men and women distribute in the working and new middle classes over sectors in the five nations, revealing a strong Nordic/North American difference. Some implications for the strength of political blocks for men and women in these classes, sectors and nations are tentatively presented. While Nordic working and new middle class women have a solid base of strength in the state sector, North American women are concentrated in the much weaker capitalist service sector. Men continue to dominate the capitalist goods sector for the working class but for the new middle class men there is a Nordic/North American split between their respective strengths, with the Nordic new middle class stronger in the state sector and the North American equivalents stronger in the capitalist sector. These patterns suggest different national bases for alliances in class politics.