Graduate Thesis Or Dissertation
 

The influence of light intensity on the phytochemistry of Chrysolepis chrysophylla (Fagaceae) and the relationship to the herbivory of Habrodais grunus herri (Lycaenidae)

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  • Defensive chemical and nutritive quality of young leaves were measured for 72 individual trees of Chrysolepis [Castanopsis] chrysophylla in conjunction with light intensities of two different stand types and population numbers of Habrodais grunus herri in the Cascade mountains of Oregon. Leaves were collected in the spring and leaf characteristics such as condensed tannins, nitrogen (crude protein), lignin, cellulose, hemicellulose, leaf resistence, and water content were measured. Light intensities were measured for each tree in the two stand types, clear-cut and old-growth stands. Population numbers H. grunus herri were measured by timed beating of each individual tree previous to leaf collection. Population numbers of H. grunus herri were significantly different between stand types. In most cases larva of the butterfly failed to show up in timed beatings of trees in the clear-cut stands compared to equal length timed beatings in old-growth stands. The two stand types, that were significantly different in light intensities, were found to be have trees that had significantly different levels of nitrogen (crude protein), leaf resistence, and water content. Old-growth stands had significantly higher levels of nitrogen, and lower levels of leaf resistence and water content. The leaf resistence was found to be explained by a combination of the leaves' lignin, cellulose and hemicellulose content. Intraspecific patterns of defense mechanisms are discussed in terms of current theories of plant defense.
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