Slower senescence in a wild insect population in years with a more female-biased sex ratio.

Baseline mortality ( b 0 ) did not differ between sex ratio levels in males, but in females it was higher when the proportion of females was highest ( figure 2 and table 1 ). (b) Effect of sex ratio on male phenotypic senescence There was a highly significant interaction between sex ratio level and the decline in calling activity with age; males experienced a fast decline in calling when the number of males and females was similar, but showed no decline in years where females outnumbered males ( figure 3 and table 2 ). 4.

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