Life Sciences Commons^™

The Effects Of 11 Yr Of Co2 Enrichment On Roots In A Florida Scrub-Oak Ecosystem, Frank Day, Rachel E. Schroeder, Daniel B. Stover, Alisha L. P. Brown, John R. Butnor, John Dilustro, Bruce A. Hungate, Paul Dijkstra, Benjamn D. Duval, Troy J. Seiler

Biological Sciences Faculty Publications

• Uncertainty surrounds belowground plant responses to rising atmospheric CO₂ because roots are difficult to measure, requiring frequent monitoring as a result of fine root dynamics and long-term monitoring as a result of sensitivity to resource availability.
• We report belowground plant responses of a scrub-oak ecosystem in Florida exposed to 11yr of elevated atmospheric CO₂ using open-top chambers. We measured fine root production, turnover and biomass using minirhizotrons, coarse root biomass using ground-penetrating radar and total root biomass using soil cores.
• Total root biomass was greater in elevated than in ambient plots, and the absolute difference was larger than …

Phylogenetic Analyses Of Tolpis Adans. (Asteraceae) Reveal Patterns Of Adaptive Radiation, Multiple Colonization And Interspecific Hybridization, Michael Gruenstaeudl, Arnoldo Santos-Guerra, Robert K. Jansen

Biological Sciences Faculty Publications

The plant genus Tolpis (Asteraceae) has been the subject of several investigations on the evolution of oceanic island plants. Its insular species were utilized in studies of artificial hybrid fertility, testing the validity of Baker’s law, the application of DNA barcodes, and the phylogenetic utility of inter-simple sequence repeat markers. Despite this considerable interest in Tolpis, little is known about its phylogenetic history. Past investigations were unable to resolve most of the interspecific relationships, especially within the Canary Islands, where the genus is particularly diverse. Incomplete taxon sampling, the use of ambiguous outgroups and the limited utility of slowly evolving …