Data for Youngflesh et al. Submitted

These are data to reproduce analyses in Youngflesh et al. Submitted. Rapid environmental change poses a threat to Antarctic ecosystems. However, the spatial scale of Antarctica and its extreme environment have precluded a synoptic understanding of the links between environmental change and ecological responses. Combining tools from imaging spectroscopy, stable isotope analysis, and hierarchical statistical modeling, we developed a novel method to quantify Adélie penguin (Pygoscelis adeliae) diet from three decades of satellite imagery (1984–2013). Sea ice dynamics played a large role in regulating penguin diet across the species global range. Spatial variation in diet was additionally linked to sustained and pronounced changes in penguin abundance. This represents the first use of satellites to capture trophic dynamics at continental and decadal scales and highlights how environmental change might restructure Antarctic food webs. The following file structure is contained in data.zip. * `L0/` * `Bathymetry_data/` * `IBCSO_v2_bed.tif` * `Landsat/` * `landsat_reflectance_L457-2025-07-16.rds` - reflectance values from penguin colonies * `SIC/` - sea ice data * `RSR/` - spectral response curves * `L4_TM_RSR.xlsx` * `L5_TM_RSR.xlsx` * `L7_ETM_RSR.xlsx` * `L1/` * `SIA_spectra.csv` - SIA and spectra for guano samples `L0/Bathymetry_data/IBCSO_v2_bed.tif` Raster data representing bathymetry from 'The International Bathymetric Chart of the Southern Ocean Version 2' (https://doi.org/10.1038/s41597-022-01366-7) `L0/Landsat/landsat_reflectance_L457-2025-07-16.rds` `sf` object (`sf` R package) with reflectance values for pixels at penguin colonies across Antarctica for Landsat 4, 5, 7 site_id - 4-letter site IDccamlr_id - CCAMLR IDregion - Region of AntarcticaLandsat.Product.Identifier.L1 - product identified from USGSsatellite - which satellite season - season yearyear - actual yearmonth - actual monthday - actual daycell - cell numberred - reflectance red bandblue - reflectance blue bandgreen - reflectance green bandnir - reflectance near infrared bandswir1 - reflectance short wave infrared band 1swir2 - reflectance short wave infrared band 2bad - 0 = good, 1 = badguano_bin = 0 = not guano, 1 = guano (only guano included)geometry = spatial location in Antarctic Polar Stereographic (3031) `L0/SIC/` Directory containing sea ice concentration derived from passive microwave sensors (10.7265/efmz-2t65) in .nc format `L0/RSR/` Spectral response curves for each band for Landsat 4 TM, Landsat 5 TM, and Landsat 7 ETM. Wavelength represents in the wavelength of the electromagnetic spectrum and the value in the second column of each tab represents the relative response (i.e., how sensitive that sensor is at that wavelength) for that particular band. `L1/SIA_spectra.csv` d15N and spectral reflectance for each guano sample used in the analysis. In each column (Wave_XXXX) the XXXX represents the wavelength in nm.