This diversity has long been an argument for assuming a non adaptive plasticity. Adaptive variations of the norms of reaction may however be analysed by a diversity of techniques, including comparisons of geographic populations of the same species, or of different species adapted to different climates. Delpuech J. M . Gibert P. et al. J. Davenport University Marine Biological Station Millport Sea turtles have a high fecundity, high mortality, great longevity life-strategy.
Low temperature induces hibernation in green turtles and loggerheads.
High incubation temperatures yield female offspring, low temperatures produce males. Pivotal temperature ranges for TSD appear to be very narrow and differ amongst species and populations. This feature of reproductive strategy is shared by many freshwater and terrestrial species. Overall, sex ratios of offspring often deviate greatly from the expected Fisherian ratio and there appears to be a trend towards an excess of females. Female turtles have recently been shown to have a high degree of fidelity to nesting beaches.