Calibrating the data logger…
Changing sex ratiosClimate-warming temperatures might be expected to affect the sex ratio of species if sex determination is temperature-dependent. Petryet al.show that indirect climate effects could also alter sex ratios in species in which sex is genetically determined and damage reproductive fitness (see the Perspective by Etterson and Mazer). Over four decades, sex ratios in populations of a dioecious alpine plant have shifted toward females as a result of the different water needs of the male and female plants. The lack of males has reduced the reproductive success and fitness of the females. Similar subtle differences between sexes in environmental sensitivities could eventually lead to population declines.Science, this issue p.69; see also p.32
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