The interactive effects of heat stress, parasitism, and hostplant quality in a host-parasitoid system

Species interactions are expected to change in myriad ways as the frequency and magnitude of extreme temperature events increase with anthropogenic climate change. The relationships between endosymbionts, parasites, and their hosts are particularly sensitive to thermal stress, which can have cascading effects to other trophic levels. We investigate the interactive effects of heat stress and parasitism on a terrestrial tritrophic system consisting of two hostplants (one common, high-quality plant and one novel, low-quality plant), a caterpillar herbivore, and a specialist parasitoid wasp. We used a fully-factorial experiment to determine the bottom-up effects of the novel hostplant on both the caterpillars’ life history traits and the wasps’ survival, and the top-down effects of parasitism and heat shock on caterpillar developmental outcomes and herbivory levels. Hostplant identity interacted with thermal stress to affect wasp success, with wasps performing better on the low-quality host..., The corresponding author collected this dataset at UNC-Chapel Hill facilities in 2020. It has been processed through Google Sheets, and then R. , , # The interactive effects of heat stress, parasitism, and hostplant quality in a host-parasitoid system

These data are used to create all of the figures and conduct all of the analyses found in the manuscript. All data were collected and analyzed by the corresponding author (A. Parker).

## Description of the data and file structure

MsCcHSFeedJan1MOD.csv

*Used to calculate all caterpillar developmental data, wasp success data, and Figs 2-4*

**Note:** All blank values in the dataset reflect developmental stages that that individual did not experience. For example, non-parasitized caterpillars will not have any values under `date.para` or `num.para`, since they were never parasitized. Similarly, individuals that did not reach instars beyond 5th will have absent values for `date.6th` and `mass.6th`. Individuals that died before the end of the experiment were not massed at time of death, so their `date.max` and `mass.max` columns are also empty. *The exception is the `date.pupa` colum...