Effects of different protein concentrations on longevity and feeding behavior of two adult populations of Ceratitis capitata Wiedemann (Diptera: Tephritidae)

Abstract

RESUMO -Neste estudo avaliou-se a infl uência da ingestão de proteína durante a fase adulta em machos e fêmeas de duas populações de Ceratitis capitata Wiedemann, uma composta por moscas criadas há vinte anos em laboratório sem a introdução de moscas selvagens (Lab-pop) e outra mantida há aproximadamente quinze anos com a introdução periódica destas (Hybrid-pop). Foram testadas três dietas: duas contendo levedura de cerveja (fonte protéica), respectivamente, nas concentrações de 6,5 g e 1,5 g por 100 ml de dieta e uma dieta sem levedura. Foram avaliados os parâmetros: longevidade dos adultos, ingestão de dietas com e sem levedura e limiar de discriminação para a levedura. A ingestão de proteína aumentou a longevidade dos adultos da Lab-pop, porém não infl uenciou a longevidade dos da Hybrid-pop. Dentro de cada população, ambos os sexos apresentaram longevidade similar, quando alimentados com o mesmo tipo de dieta. Adultos de ambas as populações apresentaram comportamento alimentar similar e preferiram se alimentar de dietas contendo fonte protéica (levedura) em relação a dietas sem essa fonte. Machos e fêmeas, em ambas as populações, ingeriram quantidades similares de uma mesma dieta. O limiar de discriminação para a levedura foi semelhante para os machos das duas populações (0,5 g/100 ml de dieta); as fêmeas da Lab-pop foram capazes de perceber uma quantidade menor de levedura na dieta, ou seja tiveram maior capacidade de discriminação (0,4 g/100 ml de dieta) em relação as fêmeas oriundas da Hybrid-pop (0,6 g/100 ml de dieta). PALAVRAS-CHAVE: Mosca-das-frutas, nutrição, limiar de discriminação, dieta, sobrevivência ABSTRACT -The effects of protein intake on two adult male and female populations of Ceratitis capitata Wiedemann were assessed. One population consisted of fl ies reared for twenty years in the laboratory (Lab-pop); the other population consisted both of fl ies reared in the laboratory for approximately fi fteen years and of the periodically introduced wild fl ies (Hybrid-pop). Three diets were tested: a no-yeast diet and two diets containing yeast (protein source) at the concentrations 6.5 g or 1.5 g per 100 ml diet. The parameters analyzed were: adult longevity, diet intake with and without yeast, and discrimination threshold for yeast. Protein intake increased Lab-pop adult longevity and did not affect longevity of the Hybrid-pop. Longevity in each population was similar for males and females fed on the same diet. Food behavior were similar for male and female adults of both populations; all preferred diets containing protein (yeast). Males and females in both populations ingested similar amounts of each diet. The discrimination threshold for yeast was similar for all males (0.5 g yeast/100 ml diet); Lab-pop females were able to detect the presence of smaller quantities of yeast in their diet, thus having a higher discrimination capacity (0.4 g/100 ml diet) as compared to the Hybrid-pop females (0.6 g/ 100 ml diet).

Influence of adult diet and exposure to methyl eugenol in the mating performance of Bactrocera philippinensis

“…For flies fed with sugar exclusively, there was no significant difference in longevity of P − females and P − males. Our results also support those obtained by Plácido‐Silva et al. (2006) in C. capitata where protein intake increased adult longevity of a laboratory population and affected the longevity of both males and females.…”

Yeast Extract: Sucrose Ratio Effects on Egg Load, Survival, and Mortality Caused by Gf-120 in Western Cherry Fruit Fly (Diptera: Tephritidae)

“…This would suggest intake of mixed diets is regulated by sucrose. In general, this explanation for the observed intake pattern is consistent with work on C. capitata (Nestel et al 1985;Plácido-Silva et al 2006) and Anastrepha obliqua (Macquart) (Fontellas & Zucoloto 1999;CresoniPereira & Zucoloto 2001;Medeiros & Zucoloto 2006), and now has been extended to R. indifferens.…”

Effect of Dietary Components on Larval Life History Characteristics in the Medfly (Ceratitis capitata: Diptera, Tephritidae)

“…This is important as small body size is associated with reduced male mating success [27], [30]. Reduced protein can also delay larval development and reduce survival to adult eclosion [24], [31], [32]. Large, protein fed males are more likely to have their sperm stored in the female and to have more sperm stored [33].…”