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plicatilis populations, these authors showed that rotifers dietary restricted for 3 or 4 days, then exposed to hypoxia ( http://www.selleckchem.com/products/a-1331852.html B. plicatilis apparently also possesses this metabolic flexibility. Gribble and Mark Welch [29] discriminated the effects of different ways of applying DR to Brachionus manjavacas: http://www.selleckchem.com/products/avelestat-azd9668.html chronic caloric restriction (CCR, chronic low food levels) and intermittent fasting (IF, alternating days of feeding and starvation). IF increased lifespan for both amictic and unfertilized mictic females. In contrast, CCR (10�C50% of ad libitum feeding) significantly increased lifespan of amictic females, but not unfertilized mictic females. This suggests a threshold of caloric restriction of at least 50% ad libitum feeding before life extension is observed. The greatest life extension of 150�C171% occurred with IF of both amictic and mictic females. DR of amictic females delayed death at young ages, rather than preventing death in middle ages or extending maximum lifespan. DR of mictic females greatly increased lifespan of a few long-lived individuals. No tradeoff was observed between lifetime fecundity and lifespan with DR, suggesting no resource allocation conflict between growth, maintenance and reproduction. The conclusion to be taken from this work on DR in rotifers is that different levels of DR can lead to different results, even in the same species. Moreover, different populations of the same species can respond differently to the same levels of DR. Thus it is difficult to categorically say that http://www.selleck.cn/products/PLX-4720.html a rotifer species does or does not respond to DR with lifespan extension. Future progress will require a better understanding of the mechanism of DR before we can understand this variability in DR response among species and feeding regime. Life extension from DR results from manipulating the quantity of food available to test animals. There could be similarly interesting lifespan effects from manipulating food quality. A facile way to compare the qualitative effects of food on rotifer lifespan is to feed different species of microalgae. Using the methods of Snell et al. [9], we fed B. manjavacas four different algal diets of equal mass (300??g?dry?wt/mL) and compared survival and fecundity patterns (Fig. 1). Mean lifespan at 22��C ranged from 10.