Date: 10/9/24 9:24 am From: Will Cook <cwcook...> Subject: Re: The poison ivy study
For more connections, Carolinabirder Jeff Pippen also helped with this study when he was working at the Duke FACE site where this research was carried out. Previously both Jeff and I worked for Richard Thomas, Stephen's brother, when Richard was a postdoc at Duke.
Obligatory bird content: I found a dead Swainson's Thrush this morning outside the FFSC building at Duke, in exactly the same spot where I found a dead Swainson's last month. These are the only two building-killed birds I've found this fall. Oddly there were no big windows in this spot, but something about the architecture makes it a trap for Swainson's.
On 10/9/2024 9:21 AM, Steve Thomas wrote:
Here’s the abstract of the 2006 investigation into the relationship between a high CO2 environment and poison ivy growth/toxicity, if you’re interested. It briefly mentions previous studies of vining plants exhibiting accelerated growth in high CO2 settings. I’m familiar with this study because my brother, currently at WVU, was one of the investigators. We’re going to have to be careful when we’re out in the woods.
Stephen Thomas Aynor, SC
Biomass and toxicity responses of poison ivy (Toxicodendron radicans) to elevated atmospheric CO2 Jacqueline E. Mohan, Lewis H. Ziska, William H. Schlesinger, Richard B. Thomas, Richard C. Sicher, Kate George, and James S. Clark
Contact with poison ivy (Toxicodendron radicans) is one of the most widely reported ailments at poison centers in the United States, and this plant has been introduced throughout the world, where it occurs with other allergenic members of the cashew family (Anacardiaceae). Approximately 80% of humans develop dermatitis upon exposure to the carbon-based active compound, urushiol. It is not known how poison ivy might respond to increasing concentrations of atmospheric carbon dioxide (CO2), but previous work done in controlled growth chambers shows that other vines exhibit large growth enhancement from elevated CO2. Rising CO2 is potentially responsible for the increased vine abundance that is inhibiting forest regeneration and increasing tree mortality around the world. In this 6-year study at the Duke University Free-Air CO2 Enrichment experiment, we show that elevated atmospheric CO2 in an intact forest ecosystem increases photosynthesis, water use efficiency, growth, and population biomass of poison ivy. The CO2 growth stimulation exceeds that of most other woody species. Furthermore, high-CO2 plants produce a more allergenic form of urushiol. Our results indicate that Toxicoden taxa will become more abundant and more ‘‘toxic’’ in the future, potentially affecting global forest dynamics and human health.
