Data and code from: Fitness consequences of parasitism in a changing world: A case study with bird blow flies and sagebrush songbirds

Host-parasite interactions increasingly are influenced by human-induced rapid environmental change (HIREC), and the fitness effects of parasitism may be compounded or exacerbated by host traits and/or exposure to additional extrinsic stressors associated with HIREC. Potential interactions between parasitism and different stressors associated with environmental change, however, remain poorly understood for most systems. We examined how parasitism by bird blow flies (Trypocalliphora braueri), ambient weather conditions, and habitat disturbance jointly affected offspring traits and juvenile mortality for two declining species of sagebrush songbirds (Brewer’s Sparrow, Spizella breweri; and Sage Thrasher, Oreoscoptes montanus) in Wyoming, USA. We evaluated two alternative hypotheses: that parasitism could act (i) in an independent and additive manner with temperature and habitat alteration (Multiple Stressors Hypothesis), or (ii) synergistically to exacerbate the effects of temperature and h..., , # Data and code from: Fitness consequences of parasitism in a changing world: A case study with bird blow flies and sagebrush songbirds

Dataset DOI: [10.5061/dryad.83bk3jb65](https://doi.org/10.5061/dryad.83bk3jb65)

## Description of the data and file structure

This dataset consists of the data and R code required to replicate analyses presented in Jones et al (in review), testing how bird blow fly parasitism, ambient temperature, and habitat disturbance affect nestling morphometric traits and post-fledging survival for two species of sagebrush songbirds. Data were collected from 2017-2023 in the Upper Green River Basin, WY, USA. Included here are proofed, raw data files with nestling measurements and parasite counts, and fledgling telemetry relocation events. Also included are data files with ambient temperature recorded at study plots, ambient temperature recorded at a nearby NWS weather station, and shapefiles hand-digitized from NAIP imagery used to calculate habitat disturbance....,