This data file consists of habitat centroids used to construct network models for sea ducks in Eastern North America and is associated with the manuscript "Spatially-explicit network analysis reveals multi-species annual-cycle movement patterns of sea ducks" published in Ecological Applications. Columns are organized as follows: id - unique identifier species - species from which the centroid was obtained (BLSC = black scoter, COEI = common eider, LTDU = long-tailed duck, SUSC = surf scoter, WWSC = white-winged scoter) stage - period of the annual cycle to which the centroid belongs (W = winter, B = breeding, S = spring staging, M = fall staging and molt, WM = winter migration, BM = breeding migration, MM = molt migration, SM = spring migration) site - position of centroid within season (i.e., W1 = first site occupied during winter, W2 = second site occupied, etc.) cycle - number of annual cycles following transmitter attachment (1 = first cycle after attachment, 2 = second cycle after attachment, etc.) sex - sex of individual (M = male, F = female) age - age of individual (HY = hatch year, SY = second year, TY = third year, ASY = after second year, ATY = after third year, AHY = after hatch year capture_reg - general area where individual was captured capture_subreg - specific region within capture region where individual was captured lon - longitude of centroid lat - latitude of centroid duration - number of days spent at centroid start - date of arrival at centroid end - date of departure from centroid jstart - Julian date of arrival at centroid jend - Julian date of departure from centroid season - season of annual cycle in which centroid occurred (W = winter, F = fall, B = breeding, S = spring) year - calendar year in which centroid began to - node in which centroid is grouped from - node in which previous centroid is grouped (i.e., node in which indiviual was located before moving to present node) to_sea - season of annual cycle in which centroid occurred from_sea - season of annual cycle in which previous centroid occurred type - movement type to centroid; the first letter represents the season (coded as in "season" column), and the second represents the nature of the movement (WD = dispersal within a season, M = migration among seasons) type2 - same as "type", but with dispersal movements coded by the stage in which they occur (W = winter, B = breeding, SM = spring migration, WM = winter migration) count_ind_sp - total number of tracked individuals of the species represented by centroid weight - base centroid weight (all centroids equal, deployments excluded) wt_sp - species-adjusted centroid weight: for centroid x in species i, weightx = (N centroidstotal) × (N centroidsi)-1 wt_dur - duration-adjusted centroid weight: for centroid x, weightx = (days at centroid location) × 365-1 wt_sp_sex - species-and-sex-adjusted centroid weight: for centroid x, species i, and sex s, weightx = (N centroidstotal) × (N individualsis)-1 wt_ind - individual-adjusted centroid weight: for centroid x in individual j, weightx = (N centroidsj)-1 wt_ind_sp - individual-and-species-adjusted centroid weight: for centroid x, individual j, and species i, weightx = (N centroidsj)-1 × (N individualsi)-1