Wednesday, 20 November 2002

This presentation is part of : Display Presentations, Subsection Cd. Behavior and Ecology

The effects of simulated herbivory on tannin production, leaf abscission and leafminer survivorship in turkey oak

Anthony M. Rossi, Keith Stokes, Melissa Murray, and Mitch Miglis. University of North Florida, Department of Biology, 4567 St. Johns Bluff Road, South, Jacksonville, FL

Induced defenses in plants may be physical or chemical. Physical defenses include increased density of structures such as spines, thorns or trichomes and chemical responses include the production of defensive secondary compounds. While tannins, which constitute a diverse group of C-based (phenolic) secondary compounds, are found in most classes of vascular plants, oaks (Quercus spp.) are probably the best known producers of tannins. In the current study, we investigated the effects of simulated herbivory on the production of tannins in the leaves of turkey oak (Quercus laevis). Herbivory of leaves was simulated using a hole punch and was localized to one-half of the leaves in either the lower, middle or upper one-third of the tree canopy. Trees were placed into one of three groups: no damage (controls), low damage (10 holes/leaf) or high damage (20 holes/leaf). Because trees averaged < 3 m in height, each tree could be easily and completely sampled. We then measured rates of leaf abscission and the survivorship and density of a guild of leafminers in trees from both damaged and non-damaged trees/zones.

Species 1: Fagales Fagaceae Quercus laevis
Keywords: induced defense, leafminers

Back to Display Presentations, Subsection Cd. Behavior and Ecology
Back to Posters
Back to The 2002 ESA Annual Meeting and Exhibition