Age- and sex-related trends in reproductive allocation in White Ash, Fraxinus americana

Project Description: 

This project aims to investigate reproductive allometry in Fraxinus americana. F. americana is a dioecious species, facilitating the investigation of sex-related trends in reproductive allocation. On branch sampling of reproductive structures will be used to test several hypotheses based on life-history theory (i.e. do older trees allocate more resources to reproduction than younger trees? Do female trees allocate more resources to reproduction than male trees?) This project has to potential to make exciting contributions to our understanding of dioecious tree physiology, dendroclimatology, and the debate surrounding the age-related decline in productivity. Sampling at Jokers Hill will involve the removal of 1-4 small branches from the canopies of white ash trees. A single tree core sample will also be taken from these trees. Both of these techniques are standard practice in investigations of this type, and are not expected to significantly impact the health of sampled trees.

Principal Investigator: 

Sean Thomas, Faculty of Forestry, University of Toronto

Other Investigators: 
Ben Filewod, Faculty of Forestry, University of Toronto

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