Title

Ecological Factors affecting the Density of Leaf Apple Galls on Arroyo Willow in a Restored Urban Stream.

Authors

Namandje Bumpus

Document Type

Article

Publication Date

2001

Abstract

The purpose of this study was to examine whether the density of sawfly galls on Arroyo willow in the Arroyo Seco, Pasadena, California were affected by physical and biological factors. The sawfly is a small wasp that induces galls on willows, where the sawfly larvae develop. The independent biological factors that I am investigating are the amount of leaf resource, the size of the tree, and the number of shoots. The independent physical factors that I plan to examine were light, nitrogen content, distance from the water, and soil quality. In this poster, I present data only on sawfly density in the study area.

Advisor

Beth Braker and Robert Gottlieb

Department

bio

Support

Urban and Environmental Policy Institute Grant

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