Evans and Keen Publish St. Catherine's Island Hickory Research

Eric Keen '08 and Biology Professor Jon Evans recently published the results from an 11 year study of pignut hickory regeneration failure on St. Catherines Island, GA. Evans and Keen report that hickory on the island is undergoing a "latent extinction" in that for the past 65 years, due to an overabundance of deer and feral hogs, no new trees have made it past the seedling stage. Using a computer model they project that, if these animal impacts continue, the adult hickory population will disappear from the island within 200 years. The authors make a number of recommendations to guide future management decisions so as to prevent the loss of biodiversity on barrier islands such as St. Cat

Evans, Scheffers, and Hess Publish Study on the Demise of Redbay on St. Catherine's Island

Redbay (Persea borbonia) joins the ranks of chestnut, hemlock, and American elm as a tree whose populations have been decimated by the introduction of an exotic disease called laurel wilt. Redbay, a member of the avocado family, was once a dominant species in southeastern coastal forests and served as the primary host plant for species such as the palamedes swallowtail butterfly. Professor Evans and his colleagues were among the first in the country to begin tracking the ecological consequences of laurel wilt on redbay. This disease is caused by an Asian beetle, Xyleborus glabratus, that bores within the tree and spreads a pathogenic fungus. The six-year study was conducted on the coast o

Sewanee Herbarium

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Jonathan P. Evans

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Plant Ecology & Conservation Lab

Department of Biology

University of the South

735 University Avenue

Sewanee, TN 37383

Sewanee Herbarium

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