Abstract
1. Rearing temperature may affect juvenile mortality, growth and development rates, adult mortality rate, and/or population growth rate. Increased juvenile growth rate may affect the trade-off curve relating fecundity to development period, lowering it and making it less steep. Here we identify the overall effects of temperature on optimal adult size. Larger bodies are favoured by decreased juvenile mortality rate and decreased population growth rate (the sum of these is termed discounted juvenile mortality rate). 2. The effects of the other variables depend on whether environmental heterogeneity is spatial or temporal. Under spatial heterogeneity larger adult bodies are favoured by increased juvenile growth rate but varying adult mortality rate has no effect
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