Atlantic White-Cedar (Chamaecyparis thyoides [L] BSP) Response Post-Hurricane Disturbance

Atlantic white-cedar (Chamaecyparis thyoides (L.) B.S.P.) is considered critically imperiled across much of its range. This species occurs in freshwater swamps, rarely further inland than 160 km from the Atlantic or Gulf Coasts and is susceptible to several natural and anthropogenic disturbances (i.e., tropical cyclones, fire, saltwater inundation, overharvesting). As the frequency and intensity of tropical storms increase, understanding the regeneration of Atlantic white-cedar will be critical to its conservation. This study evaluated the regeneration of Atlantic white-cedar 14 years after Hurricane Katrina. All Atlantic white-cedar >= 2.5 cm at breast height were inventoried within an similar to 9 ha study area located within Grand Bay National Wildlife Refuge in Jackson County, Mississippi, USA. Additionally, the competing woody vegetation was surveyed. After Hurricane Katrina, the number of Atlantic white-cedar stems increased by 191%. This long-term study provides the first analysis of Atlantic white-cedar regeneration post-tropical cyclone disturbance within the Gulf Coast and allows conservationists a better understanding of the effects of tropical cyclone disturbance on this species. Study Implications: This study provides evidence that tropical cyclones are contributing to the regeneration of Atlantic white-cedar on the Gulf Coast through canopy gap openings and competition control. In some cases, tropical cyclone disturbance is likely sufficient for Atlantic white-cedar regeneration. However, if tropical cyclone disturbance is not sufficient to maintain canopy gap openings and competition control, active management may be needed to create appropriate canopy gaps for Atlantic white-cedar regeneration. Finally, this study allows land managers and conservationist on the Gulf Coast to better understand how their stands will regenerate post-tropical cyclone disturbance.