Effect of variable food levels on reproductive performance of breeding female three‐spined sticklebacks

The study examined the response to variation in food ration within a breeding season on components of the reproductive performance of mature female three-spined sticklebacks Gasterosteus aculeatus, a batch spawner. The main effect of food availability was on the duration of the inter-spawning interval (ISI). Low ration resulted in an increase in the number of days until the next spawning. A low ration during one inter-spawning interval increased the length of the next ISI, even if there was a high ration in the latter. Females that experienced high rations for two successive ISIs showed an increase in batch fecundity over the successive spawnings. There was no tendency for fish on low rations to produce bigger eggs or eggs with higher lipid concentration. Females on low ration had a lower carcass dry matter concentration and a lower liver dry weight immediately after their third spawning. Female sticklebacks responded to a low ration with little change in egg number or size, but a slight reduction in physiological condition. Egg characteristics and, to a lesser extent, batch fecundity are insensitive to current rate of food consumption, but the interval between spawnings is sensitive to both current and previous rates of consumption.

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