Experimental data from "Finding the Equilibrium of Organic Electrochemical Transistors"

Experimental data from "Tuning the Transconductance of Organic Electrochemical Transistors"

Experimental Data

Aim: We studied β diversity of grasses in a subtropical grassland over 60 years in South Africa. We examined the effects of burning and mowing on 132 large plots. We sought to determine the effects of burning and mowing, and mowing frequency, on the replacement of species and the species richness.

Location: Ukulinga, research farm of the University of KwaZulu-Natal, Pietermaritzburg, South Africa
(29º 24’ E, 30º 24’ S).

Time period: 1950-2010.

Methods: Plots were burned annually, biennially, triennially, and a control (unburned). Plots were mowed in spring, in late summer, spring plus late summer, and a control (unmowed). We calculated β diversity, with a focus on replacement and richness differences. We also used distance-based redundancy analyses to examine the relative effects of replacement and richness differences on mowing and burning. We used beta regressions to test for the effect of soil depth and its interactions with mowing and burning.

Results: There was no significant change in grass beta diversity until 1995. Thereafter, there were changes in β diversity that demonstrated the primary effects of summer mowing frequency. There was no significant effect of richness differences, but a strong effect of replacement post-1995. There was a significant interaction between mowing frequency and soil depth in one of the analyses.

Main conclusions: Changes in grassland composition took a long time to manifest themselves and were unapparent prior to 1988. However, there was a change in sampling strategy prior to 1988, from point hits to nearest plants, that may also have influenced the rates of changes in replacement and richness differences. Using β-diversity indices, we found that mowing was more important than burning, that burning frequency was unimportant, and there was a significant interaction effect between mowing and soil depth in one of the analyses.

Associated data set from research project.

Published article- Dressler, Virginia, and Jodi Kearns. 2022. “Probing Archivists’ Perceptions and Practices in Privacy.” Archives and Records- The Journal of the Archives and Records Association https://doi.org/10.1080/23257962.2022.2073207

The title of this research project is: "Differentiated plant-defense strategies: herbivore community dynamics affect plant-herbivore interactions" and it ran from May 2017 until October 2020.

There were 6 deer exclosures set up at Liberty Park in the Summit County Metroparks. There were 4 swamp white oaks (Quercus bicolor) planted inside each exclosure and 4 planted outside each exclosure. Insecticide was applied to half of the exclosures to establish 4 different herbivore feeding communities: 1) No herbivores, 2) deer only, 3) insect only, and 4) deer and insect herbivores. From each tree, we measured phytochemical changes in trees above and below the browseline over the four years. Measurements were taken in May and September each year. Additionally, we analyzed insect-feeding guilds and recorded the dominant feeding guild in each tree.

One dataset has the insect feeding guild diversity and the other contains the phytochemical changes from the plants.