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Abstract

Longleaf pine (Pinus palustris Miller) ecosystems of the southeastern U.S. are among the most biologically diverse outside of the tropics. Longleaf pine forests provide numerous ecosystem services, though these once dominant forests have been vastly reduced. Longleaf pine’s evolution with and adaptation to natural disturbances make them especially resilient, however disturbance events beyond the historical range of variability are predicted under climate change. This dissertation explores the effect of disturbance agents and their interaction with subcortical beetles after disturbance events in longleaf pine forests in Georgia. We synthesize existing literature on how bark beetles respond to wind disturbances, particularly in the context of climatic changes, providing a model for understanding bark beetle-windstorm interactions. We evaluate the effects of management practices on three native Ips species [I. avulsus (Eichhoff), Ips calligraphus (Germar), and I. grandicollis (Eichhoff)] and woodboring beetles in longleaf pine following a catastrophic hurricane in windthrown stands treated with three post-windstorm management approaches: no post-storm management, prescribed fire, and salvage logging followed by prescribed fire. We found no significant difference in beetle catches between treatments likely due to an active management history in these longleaf pine stands. We further present the results of a study evaluating the response of the beetle assemblage to simulated-lightning-struck mature longleaf pine trees by sampling flight activity at different heights (0, 5, 10, and 15 m). We collected 47,343 adults and 275 species, and found patterns of vertical distribution that differed both within and between feeding guilds. Longleaf pine forests’ natural resilience and adaptations to regional disturbance agents, such as hurricanes and insects, indicate that they may fare better in response to climatic changes than other pine species.

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