Despite the growing number of statistical analyses of life-history data and a long tradition of biographical research, there is often no communication between these two streams of life-course research. It is possible to examine the life course quantitatively through life histories, which may be used to model synthetic biographies in order to reveal patterns in the timing and sequencing of life events, the durations of states between them, and the causal links between them. It is also possible to examine the life course qualitatively through life stories, e.g. biographical narratives, which reflect how persons understand, experience and attach meaning to events and states in their life. Through a quantitative analysis of life-history data we can describe and explain the morphology of particular events in the observed population, while a qualitative analysis of biographical narratives provides insight into people’s decision-making, perceptions of their options, and how they attach meanings to and experience events. This article summarizes the strengths and weaknesses of both approaches, explains in which sense they are connected or differentiated from each other, what data and analyses each perspective may utilize, and briefly introduces one type of mixed methods life course research that utilizes the complementarity of both approaches., Hana Hašková a Radka Dudová., and Obsahuje bibliografii
The duration of development, survivorship and adult size were compared for the larvae of Amara aenea reared in the first generation on pure diets of seeds (Stellaria media, Capsella bursa-pastoris, Tussilago farfara, Plantago major, Urtica dioica, or Potentilla argentela), or a pure diet of yellow mealworms (Tenebrio molitor larvae), and on a mixed diet of seeds and mealworm larvae (T. molitor, S. media and C. bursa-pastoris). To ascertain any long-term effects of pure diets, the beetles were reared on the same pure diet for several generations, or on different pure diets in different generations. The hypothesis that the larvae are primary omnivorous was tested. The evidence that the larvae of A. aenea are primary omnivorous was obtained by revealing that the larvae reared on the mixed diet of insects and seeds survived better, and developed faster in larger adults than those reared on the pure diets of seeds or insects. When the beetles were reared on the same pure diet for several generations, survivorship, and in most cases also the duration of development, did not change. However, when the beetles were reared on a different pure diet each generation, survivorship significantly decreased in successive generations.