The interaction of frequency and density-dependence on sex ratio in an annual dioecious plant

Project Description: 

The immobility of plants means that their local environment can have an important influence on mating events. For dioecious species (which have separate male and female plants), the number of males and females in a patch and plant density can influence the amount of pollen available and the sex ratio of the offspring. The effects of pollen competition may be particularly important for dioecious species with sex chromosomes as male and female-determining pollen grains may differ in their fertilization success, which can influence offspring sex ratios. This project aims to assess the importance of both adult sex ratios and plant density to seed sex ratios in an annual dioecious plant.

Principal Investigator: 

Prof. Spencer C. H. Barrett, Ecology and Evolutionary Biology, University of Toronto

Other Investigators: 
David L. Field, Postdoctoral Fellow, Ecology and Evolutionary Biology, University of Toronto
Melinda Pickup, Postdoctoral Fellow, Ecology and Evolutionary Biology, University of Toronto

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