Sex ratio variation in the dioecious shrub Oemleria cerasiformis

Article Abstract:

A study of sex ratio variation in 60 natural populations of the North American dioecious shrub Oemleria cerasiformis is reported. The study revealed that there was an excess of males in 56 of the 60 populations. genet ratio in young plants was 1:1, but was male-biased in mature plants due to differential mortality. Examination of dead genets confirmed that the greater mortality of females was the main cause of male-biased sex ratio in O. cerasiformis.

Plant populations

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Intracolonial sex ratio variation with and without local mate competition in an ant

Article Abstract:

The highly female-biased investment ratio among wingless ant sexuals of Technomyrmex albipes is due to the restricted mating pool or local mate competition. Technomyrmex albipes have two distinct sex ratios in the same in the same population and colony. These unique differences result from the differences in dispersal tactics and the mating structure of alate and wingless reproductive ants.

Physiological aspects, Ants

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