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Ovarian development, oviposition, larval eclosion, ornithine decarboxylase (ODC) activity, ovarian, testis and ejaculatory apodeme measurements (length, width, and area), and the number of spermatozoa of Anastrepha fraterculus (Wiedemann) were analyzed at alternating (20º/6ºC and 20º/13 o C) and constant (6 o C; 25 o C) temperatures. Life span and life expectancy were also analyzed for both genders. All the results suggest that temperature, especially alternating temperatures, increase not only male and female reproductive potential but also their life span and life expectancy. These changes can be a powerful strategy triggered by A. fraterculus as a means to survive the stressful temperature conditions found in winter in the apple production region in Brazil, enabling this species to increase its population density and cause apple damage when spring begins.Key words: reproductive potential, Tephritidae, temperature. RESUMO Efeitos de temperaturas constantes e alternadas no potencial reprodutivo, longevidade e expectativa de vida de fêmeas e machos de Anastrepha fraterculus (Wiedwmann) (Tephritidae)O desenvolvimento ovariano, ovoposição, eclosão larval, atividade de ornitina descarboxilase (ODC), medidas de largura, comprimento e área do ovário, testículo e apódema ejaculatório e número de espermatozóides de Anastrepha fraterculus (Wiedemann) foram analisados em temperaturas alternadas (20º/6 o C e 20º/13 o C) e constantes (6 o C e 25 o C). A longevidade e a expectativa de vida também foram analisadas em ambos os sexos. Todos os resultados sugerem que a temperatura baixa e principalmente as temperaturas alternadas afetam não somente o potencial reprodutivo de machos e fêmeas, mas também sua longevidade e expectativa de vida, prolongando-as. Essas mudanças podem ser uma poderosa estratégia usada por A. fraterculus para sobreviver às condições estressantes de temperatura observadas no inverno na região produtora de maçãs, tornando-as capazes de aumentar sua densidade populacional e causar dano à maçã no início da primavera.Palavras-chave: potencial reprodutivo, Tephritidae, temperatura. Braz. J. Biol., 62(4B): 775-786, 2002 776 CARDOSO, V. V. et al.

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Introduction: BKV nephropathy (BKN) causes kidney graft loss, whose specifi c diagnosis is invasive and might be predicted by the early detection of active viral infection. Objective: Determine the BKV-infection prevalence in late kidney graft dysfunction by urinary decoy cell (DC) and viral DNA detection in urine (viruria) and blood (viremia; active infection). Methods: Kidney recipients with >1 month follow-up and creatinine >1.5 mg/dL and/or recent increasing >20% (n = 120) had their urine and blood tested for BKV by semi-nested PCR, DC searching, and graft biopsy. PCR-positive patients were classifi ed as 1+, 2+, 3+. DC, viruria and viremia prevalence, sensitivity, specifi city, and likelihood ratio (LR) were determined (Table 2x2). Diagnosis effi cacy of DC and viruria were compared to viremia. Results: DC prevalence was 25%, viruria 61.7%, and viremia 42.5%. Positive and negative patients in each test had similar clinical, immunossupressive, and histopathological characteristics. There was no case of viremia with chronic allograft nephropathy and, under treatment with sirolimus, patients had a lower viruria prevalence (p = 0.043). Intense viruria was the single predictive test for active infection (3+; LR = 2.8).