A phenotypic trade-off between previous growth and present fecundity in round sardinella Sardinella aurita
2007
Tsikliras, Athanassios C | Antonopoulou, Efthimia | Stergiou, Konstantinos I
The decision of how to allocate surplus energy to reproduction and growth can have important effects on fish population dynamics as well as on other life history traits. The natural examples on the interrelationship between maternal growth and number of offspring produced in fishes are scarce. We tested the hypothesis that these traits are competing for resources by estimating maternal previous growth decisions, using back-calculation, and present reproduction, expressed as absolute fecundity, of female round sardinella (Sardinella aurita) in the northeastern Mediterranean Sea. Despite the overall increasing trend of fecundity with age, individual fecundity was negatively related to individual specific growth rate between the most recent annulus formation and spawning within ages. A decreasing trend between previous growth rate and present fecundity emerged, showing that round sardinella allocate increasingly less energy to growth with age and more into reproduction and that the previous growth decisions determine present fecundity.
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