Data for: Interactions between temperature and predation impact insect emergence in alpine lakes

# Data from: Interactions between temperature and predation impact insect emergence in alpine lakes --- This repository contains all data and code used to prepare the manuscript "Interactions between temperature and predation impact insect emergence in alpine lakes" (Owens et al 2023). ## Description of the Data and file structure ### Data files Data files `combined_unsummed_etraps` and `combined_orderlevel_etraps` contain the raw counts of insects that were collected from our emergence traps in alpine lakes in California's Sierra Nevada during summers 2019 and 2021. The column 'fish' indicates the absence (0) or presence (1) of introduced trout. The column 'block' indicates the relative elevation of each lake (1 = highest; 2 = mid; 3 = lowest pair). The column 'lake' has a 3 letter code that uniquely identifies each lake in the study (see Owens et al. 2023 supplementary material for list of exact lake locations). The column 'sample_date' is the day on which each trap was collected. The column 'trap' indicates the approximate cardinal direction around the lake where each trap was placed. The column 'data_flag' was initially used for QA/QC and can now be ignored. Remaining columns indicate the number of individuals collected from each trap after a 24-hour deployment (number per trap per day). The following abbreviations are used in column headers: | abbreviation | taxonomic name | | ------------ | -------------- | | dip | Diptera | | chir | Chironomidae | | sim | Simuliidae | | culic | Culicidae | | tot | total | | cole | Coleoptera | | hemip | Hemiptera | | trichop | Trichoptera | | hemip | Hemiptera | The file `emerg_models_2022` contains insect data for each trap, paired with information on lake daily temperature ('dailytemp'), peak seasonal temperature ('peaktemp'), and number of days since lake iceoff ('DSI'). Temperature values in this file are nighttime averages that were derived from the file `temps_all` by restricting times to between 2hrs post sunset and sunrise each day. All temperatures are measured in degrees Celsius. In this file, the column 'total' indicates the total number of insects in each trap. 'total_dip' indicates the number of those which were Diptera, and 'total_nd' the number which were Ephemeroptera (mayflies) or Trichoptera (caddis flies). 'presence' is a logical variable indicating whether any non-Dipteran taxa were present in the trap. The columns 'tot_m2' and 'dip_m2' scale the number of total insects, or number of Diptera, by the area of the trap (0.27m$^2$) to get an areal estimate of insect emergence per trap night per meter squared. The columns 'tot_mass', 'tot_dip_mass', and '*_mass_m2' are scaled estimates of emerging biomass obtained by multiplying total and areal counts by taxon-specific biomass estimates obtained by measuring our specimens and applying the formulae from Sabo and Power (2002). Units for each of these columns are mg per trap night per trap, or mg per trap night per meter squared. The columns 'tot_per', 'dip_per', and 'nd_per' are the estimates of body size obtained by dividing emerging biomass in each category by insect abundance in that category. Units for each of these columns are mg per individual. In the file `temps_all`, temperature is measured in degrees Celsius and DSI represents the number of days since lake iceoff. ### Code files The R markdown file `model_confirmation` contains the code that was used to calculate temperature averages using full daily records, combine those averages with the nighttime restricted temperatures, and then fit and evaluate statistical models for each response variable studied in the paper. The file `slip_data_viewing` contains the code that was used to explore and visualize data from the Sierra Lakes Inventory Project (Knapp et al. 2020) for comparison to our samples. The file `emerg_NMDS_v3` contains the code that was used to create fig. 3 and conduct dimension reduction analyses. The file `emerg_clean_models` contains code that was used for initial model fitting and exploration, as well as to create figure 2. The file `visualizations` contains code that was used to create figure 1. ## Sharing/access Information Links to other publicly accessible locations of the data: * SLIP data is available from [the Environmental Data Initiative repository](https://portal.edirepository.org/nis/mapbrowse?scope=edi&identifier=577). Please cite any use of that data separately and appropriately. * Lake ice-off dates were determined using PlanetLabs Planet Explorer interface to view meter-scale satellite imagery. See the [PlanetLabs site](https://www.planetlabs.com/explorer) for more information. Please contact Caroline Owens () with any questions or concerns.