Non-equivalence of growth arrest induced by predation risk or food limitation: context-dependent compensatory growth in anuran tadpoles.
1. To gain insight into the evolution of compensatory growth, we studied the growth patterns of anuran (Rana temporaria) larvae following either a period of exogenous growth depression (food restriction) or a period of endogenous depression (exposure to predators). We also investigated the potential deferred costs that larval compensatory growth could impose on post-metamorphic individuals. 2. Food-deprived larvae exhibited full compensatory growth in response to reduced growth rates caused by food limitation, and the growth trajectories of low- and high-rations tadpoles converged before the onset of metamorphosis. 3. According to our predictions, individuals exposed to larval predators did not show growth compensation following predator removal despite undergoing a significant reduction in growth rate associated with low activity levels. 4. Jumping ability of individuals exposed to predators during only 20 days from the commencement of the larval phase was equivalent to that of non-exposed animals, and greater than the jumping capacity of those maintained with predators until the time of metamorphosis. This pattern was consistent with the pattern observed for variation in relative leg length. 5. These results support the suggestion that submaximum and compensatory growth could have evolved to minimize the overall growth/mortality costs in environments with high spatiotemporal variation in predation intensity.
Capellán
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Ecology Unit, Department of Biology of Organisms and Systems, University of Oviedo, E-33071, Oviedo, Spain.
Nicieza
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AG
D000222:Adaptation, Physiological; D000818:Animals; D017753:Ecosystem; D005247:Feeding Behavior; D005523:Food Supply; D007814:Larva / Q000033:anatomy & histology / Q000254:growth & development / Q000502:physiology; D011158:Population Growth; D011235:Predatory Behavior; D011896:Rana temporaria / Q000033:anatomy & histology* / Q000254:growth & development* / Q000502:physiology; D012307:Risk Factors