Estimation of trade-offs with capture-recapture models: A case study on the lesser snow goose

Trade-offs between traits such as fecundity or survival are fundamental to much of our understanding of the evolution of life histories. There has been much renewed interest and controversy concerning methods for estimating trade-offs, in the wild or in captivity, and with or without experimental manipulations. In this paper, we assess the general question of the utility of modern capture-recapture methods as a robust tool for estimating trade-offs in natural populations. We present results from analyses of two forms of trade-offs: the cost of present reproduction on future survival and the cost of present reproduction on the probability of breeding in the future. We apply the methods to data from a long-term study of a snow goose population, and generally discuss the advantages and potential problems with various approaches.     

Are More Competent Workers More Satisfied?

Abstract. In this paper, we analyse the relationship between workers' competencies and their job satisfaction in the context of dual (i.e. vocational versus communicative) skill demands. We analyse the effects of workers' competencies on their overall, intrinsic, and extrinsic job satisfaction. We focus on pharmacy assistants who need both pharmaceutical and communicative competencies in their work. Results from a linked employer–employee survey show that assistants with more communicative competencies are more satisfied with their job, whereas assistants with more pharmaceutical competencies are not more satisfied than the less competent assistants. In addition, workers who perform tasks below their level of competence are more dissatisfied with both their remuneration and career prospects and the content of their job as such, than were other workers. Our results indicate that the demand shift from vocational towards communication skills, which occurs in many professions, can affect the job satisfaction of the most competent workers.