Collatz K G, Wilps H
Exp Gerontol. 1985;20(6):347-57. doi: 10.1016/0531-5565(85)90015-4.
The age-dependent variations in the amount of food ingestion, egg production, and flight activity of protein-fed female Phormia terrae novae were analyzed. Also the influence of mating and forced physical performance on the time course of these parameters and on life span were tested. In virgin females, the life span with the investigated factors is generally delayed, together with mean and maximum life span. In comparison to mated females virgin females exhibit a 40% prolongation of mean life span and ingest more sugar with a later intake maximum. Their egg production starts 5 days later (Day 10) but reaches only half the amount occurring in mated females. Flight performance is generally higher in virgin females, reaching its maximum 2 days later (Day 14), with a more gradual decline instead of the sudden drop in flight performance seen in mated flies. Females receiving their food by flight only ("forced fliers") show a shorter mean life span (which is more pronounced in virgin flies). The maximum of sugar intake shifts forward to an earlier point after eclosion, and the amount is reduced by about 30% over the entire life span. Similarly, the egg production rate reaches lower values and tends to have an earlier maximum in comparison to corresponding groups that had access to sugar on the cage floor. The results further support the hypothesis that Phormia exhibits a strictly programmed aging pattern. Its time course depends on reproduction sufficiency and physical performance. Both factors act to shorten life expectation.
分析了蛋白质喂养的新陆伏蝇雌蝇在食物摄取量、产卵量和飞行活动方面的年龄依赖性变化。还测试了交配和强制体力活动对这些参数的时间进程和寿命的影响。在未交配的雌蝇中，受研究因素影响，其寿命普遍延迟，平均寿命和最长寿命也相应延迟。与已交配的雌蝇相比，未交配的雌蝇平均寿命延长了40%，摄入更多糖分，且糖分摄入峰值出现得更晚。它们的产卵开始时间推迟5天（第10天），但产卵量仅为已交配雌蝇的一半。未交配雌蝇的飞行能力通常更强，在羽化后2天（第14天）达到峰值，飞行能力下降较为平缓，不像已交配的果蝇那样突然下降。仅通过飞行获取食物的雌蝇（“强制飞行者”）平均寿命较短（未交配的果蝇更为明显）。糖分摄入峰值在羽化后提前出现，且在整个生命周期内摄入量减少约30%。同样，与能在笼底获取糖分的相应组相比，产卵率较低，且峰值出现时间更早。这些结果进一步支持了新陆伏蝇表现出严格程序化衰老模式的假说。其时间进程取决于繁殖充足程度和体力活动。这两个因素都会缩短预期寿命。
