june utc deleted speculation reference in the wings this raises concerns over the connection between rapid global temperature changes and the possibility of population extinction i'm waiting for v to format the reference from this source proc nati acad sci usa vol pp august population biology climate change and temperature dependent sex determination in reptiles eticon population demography rate of evolutin sex ratio turtles fredric j janzen department of ecology and evolution university of chicago chicago il communicated by gordon h orians april received for review january i suggest the connection between the concern over global warming and extinction be returned to article based on this passage the causal influence of annual variation in climatic temperature on cohort sex ratios in this population of painted turtles serves as a clear empirical example of the biological impact portended by rapid global temperature change this study demonstrates that the demography of populations of species with temperature dependent sex determination may be directly sensitive even to modest deviations in the local thermal environment these results are entirely consistent with earlier work on a nesting beach of endangered loggerhead sea turtles caretta caretta wherein of hatchlings from the rookery in each of years were females because sand temperatures at nest level were high if such strongly female biased cohorts lead to highly skewed adult sex ratios then the probability of population extinction may be greatly enhanced it has been referenced and the speculation was restored talk contribs count email