Synopsis
The cost of reproduction is a central concept in theories of life-history evolution. One way to empirically examine the tradeoff between current reproduction and future reproductive prospects is to use natural intraspecific variation in life-history traits. However, this approach is complicated by the sensitivity of life-history traits to variation in the level of resources. We report here an attempt to measure the cost of increasing reproductive activity in populations of female bluehead wrasse,Thalassoma bifasciatum, a coral-reef fish. All of the significant correlations of fecundity and growth rate were positive, in contradiction to the tradeoff predicted by the cost concept. In one of two regions studied, the populations with relatively high mean growth rate had a relatively large mean fecundity. The trait means were also positively associated over time: in months of rapid growth, female reproductive activity was high. Even after removing the effects of habitat and time period in a comparison of individual traits, no growth cost to reproduction appears. Variation in the abundance of resources over space and time is likely to interfere with the measurement of the cost of reproduction in many natural systems.
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Schultz, E.T., Warner, R.R. Phenotypic plasticity in life-history traits of femaleThalassoma bifasciatum (Pisces: Labridae): 2. Correlation of fecundity and growth rate in comparative studies. Environ Biol Fish 30, 333–344 (1991). https://doi.org/10.1007/BF02028849
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DOI: https://doi.org/10.1007/BF02028849