Data and code from Lamb et al., "Evaluating conservation units using network analysis: a sea duck case study"

This file consists of data and code used to construct network models for scoters in North America and is associated with the manuscript "Evaluating conservation units using network analysis: a sea duck case study" published in Frontiers in Ecology and the Environment. 

Continental scoter network mapping is the R script used to run analyses.

duck_nodes is the main datafile. Columns are organized as follows:
id - unique identifier
species - species from which the centroid was obtained (BLSC = black scoter, 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)
ew - capture location in eastern (east; Atlantic and Great Lakes) or western (west; Pacific) North America
count_ind_sp - total number of tracked individuals of the species represented by centroid
wt - base centroid weight (all centroids equal, deployments excluded)
wt_sp - species-adjusted centroid weight: for centroid x in species s, weightx = (N centroids) × (1 / (n centroids in s))
wt_dur - duration-adjusted centroid weight: for centroid x, weightx = (days at centroid location) × 365-1
wt_ind -  individual-adjusted centroid weight: for centroid x in individual j, weightx = 1 / (n centroids in j)
wt_ind_sp - individual and species adjusted centroid weight: for centroid x, individual j, and species s, weightx = (N centroids / (N species * n individuals in s)) × (1 / (n centroids in j))
wt_cap - capture location adjusted centroid weight: for centroid x and capture location c, weightx = (N centroids / N capture locations) / n centroids in c
wt_ew - east-west adjusted centroid weight: for for centroid x and region r, weightx = (N centroids / N regions) / n centroids in r
wt_spew - species and east-west adjusted centroid weight: for centroid x species s, and region r, weightx = (N centroids / (N species × N regions)) / n centroids for species s in region r
wt_indspew - individual, species, and east-west adjusted centroid weight: for centroid x, individual j, species s, and region r, weightx = N centroids / (N species × N regions × n centroids for individual j × n individuals for species s in region r)
wt_spewcap - species, east-west, and capture location adjusted centroid weight: for centroid x, species s, capture location c, and region r, weightx = N centroids / (N species × N regions × n centroids for species s in capture location c × n capture locations for species s in region r)