Data and Code Associated with Sauve et al. Evol Letters

Included is the dataset used to measure selection gradients for mass and wing length across the ontogeny of nestling black-legged kittiwakes on Middleton Island, Alaska. <br> Each .csv file includes the following variables for age specific observations of nestling black-legged kittiwakes. The number after ALL indicates the age observations were taken and a number 1 following the age is the dataset that includes environmental predictors. For example hatching masses are all included in the ALL0.csv and age 5 masses are all included in the ALL5.csv. ALL01 is the file that includes environmental predictors for survival from age 0 days (hatching) to age 5 days. ALL051 would be the file that includes environmental predictors of survival from age 5 days to age 10 days. <br> <br> - Year: indicates the year of measurement - Treatment: indicates the food supplementation treatment of the nestling observations were recorded for. fed equals food supplemented and unfed equals non-food supplemented. - Rank: indicates that hatching rank of the nestling. a equals first hatched and b indicates second-hatched - Age: indicates the age of mass and wing-length measurement - Weight: The mass measurement in grams - Wing: The wing length measurement of a nestling in millimeters - Date: indicates the calendar date for the measurements - GrowRefDate: indicates the date 40 days after the hatching date - Surv0: indicates whether or not the nestling survived to the next age category. 0 indicates death and 1 indicates survival -Weight2: The mass of the nestling mean centered and scaled to units of standard deviation - Wing 2: The wing length of the nestling mean centered and scaled to units of standard deviation <br> CSV files ending in 1 include environmental data - pdo1: Pacific decadal oscillation during the current breeding season - pdo2: Pacific decadal oscillation from two years prior to the breeding season - AirWin: Minimum air temperature during the breeding season in degrees celsius -SSTWin: Average sea-surface temperature during the breeding season <br> See the below references for details on the environmental variables <br> Sauve, D., Charmantier, A., Hatch, S. A., &amp; Friesen, V. L. (2022).Environmental conditions variably affect growth across the breeding season in a subarctic seabird. Oecologia, 198, 307–318 <br> Whelan, S., Hatch, S. A., Gaston, A. J., Gilchrist, H. G., &amp; Elliott, K. H. (2022). Opposite, but insufficient, phenological responses to climate in two circumpolar seabirds: Relative roles of phenotypic plasticity and selection. Functional Ecology, 36,1782–1795. <br> The RMarkdown file includes code to run the models of selection in the manuscript. <br>