Dissertation/Thesis Abstract

Climate-Driven Insect Herbivory in Mixed Coast Live Oak Woodlands wthin the Mt. Hamilton Range, Santa Clara County
by Domocol, Michelle, M.S., San Jose State University, 2019, 60; 27736655
Abstract (Summary)

Climate change is expected to dramatically alter and destabilize critical functions of oak woodlands (Quercus spp.) in California. Oak woodlands support hundreds of vertebrate species and thousands of native insect species. Climate-driven changes in annual temperature, annual rainfall, and spatial climatic variability may increase insect herbivore pressures on mixed coast live oak (Quercus agrifolia) woodlands. The Mt. Hamilton Range of Santa Clara County, California offers a unique matrix to study oak-insect herbivore relationship using elevation as a proxy for climate change. This thesis research assessed the relationship between lepidopteran herbivory and coast live oak with insect surveys and the laboratory analysis of phenolic compound concentrations. Results were evaluated under two plant-herbivore theories, Resource Availability Hypothesis (RAH) and Plant-Size Apparency Hypothesis (PSAH). Results indicate elevation increased as mean annual temperature declined, confirming that elevation in this system is a suitable proxy for climate change. Relationships between herbivory, elevation and plant defense chemicals showed larger plant size correlated with higher herbivory. Overall, the results did not support RAH and partially supported PSAH. Results suggest managers should use alternate hypotheses in combination with an elevational framework. As the climate changes, future elevational surveys may help managers understand how to best preserve Mt. Hamilton’s oak woodlands.

Indexing (document details)
Advisor: Trulio, Lynne
Commitee: Byrd, Kristin, Davis, Kathryn
School: San Jose State University
Department: Environmental Studies
School Location: United States -- California
Source: MAI 81/8(E), Masters Abstracts International
Subjects: Environmental management, Botany
Keywords: Climate change, Coast Live Oak, Elevational survey, Oak Herbivory, Resource Availability Hypothesis, Santa Clara County
Publication Number: 27736655
ISBN: 9781392613580
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