Predation cost of rapid growth: behavioural coupling and physiological decoupling

摘要: Summary 1. Despite its prominent role in life-history theory, there is no direct empirical evidence for a behaviourally mediated predation cost of rapid growth. Moreover, we know little about how digestive physiology may also influence the shape growth/predation risk trade-off function. 2. We determined behaviour and experiments which damselfly larvae were induced to grow slowly or rapidly by manipulating photoperiod (time stress), exposure fish predator. 3. showed that under time stress grew more rapidly. Rapid-growing had higher foraging activity growth efficiency. 4. Under risk, not only lower but 5. (i.e. those stress) balanced differently took presence predator, resulted compared slow-growing larvae. Their efficiency, however, made this smaller completely rapid-growth strategy. 6. Our results provide first explicit experimental proof Besides behavioural coupling resulting well-known trade-off, found partial decoupling these two processes physiology.