DOI: 10.5281/zenodo.10137096
title: Data and code from Lamb et al., "Evaluating conservation units using network analysis: a sea duck case study"

description: 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)