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3 results for “black scoter”
Data: Annual-Cycle Movements and Phenology of Black Scoters in Eastern North America
<p>This data file consists of R code and associated data files used to analyze movements of black scoters in Eastern North America and is associated with the manuscript "Annual-Cycle Movements and Phenology of Black Scoters in Eastern North America" published in Journal of Wildlife Management.</p> <p>***</p> <p>blsc.csv (main datafile) contains state-space model-derived locations and individual data. Columns are organized as follows:</p> <p>id - unique identifier</p> <p>date - date of location (mm/dd/yy)</p> <p>jday - Julian date of location</p> <p>year - calendar year of location</p> <p>lon - longitude of location</p> <p>lat - latitude of location</p> <p>b - average assignment of location to either migrant (1) or resident (2) across all runs of the state-space model</p> <p>b.5 - most probable behavioral category based on average state assignment (1 = b ≤ 1.5 ; 2 = b > 1.5)</p> <p>sex - sex of individual (M = male, F = female)</p> <p>age_y1 - age of individual (HY = hatch year, SY = second year, TY = third year, ASY = after second year, ATY = after third year, AHY = after hatch year</p> <p>capture_reg - general area where individual was captured</p> <p>capture_subreg - specific region within capture region where individual was captured</p> <p>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)</p> <p>site - position of centroid within season (i.e., W1 = first site occupied during winter, W2 = second site occupied, etc.)</p> <p>cycle - number of annual cycles following transmitter attachment (1 = first cycle after attachment, 2 = second cycle after attachment, etc.)</p> <p>season - season of annual cycle in which centroid occurred (W = winter, F = fall, B = breeding, S = spring</p> <p>***</p> <p>ind_vars.csv contains additional information on individual capture seasons and dates. Columns are as defined above with additional columns as follows:</p> <p>tagging_season - season in which bird was captured and fitted with PTT (W = winter, S = spring)</p> <p>tagging_date - date on which bird was captured and fitted with PTT</p> <p>***</p> <p>all_seasons2.csv contains calculated values for between-year distances. Columns are as defined above with additional columns as follows:</p> <p>sex - AVG = average of all sites used by all other individuals in the following year, M = sites used by same individual in the following year (male), F = sites used by same individual in the following year (female)</p> <p>min_same = distance between sites used in subsequent years</p>
Black Scoter habitat use along the southeastern coast of the United States
<p>While the Atlantic Coast of the United States and Canada is a major wintering area for sea ducks, knowledge about their wintering habitat use is relatively limited. Black Scoters have a broad wintering distribution and are the only open water species of sea duck that is abundant along the southeastern coast of the United States. Our study identified variables that affected Black Scoter (<i>Melanitta americana</i>) distribution and abundance in the Atlantic Ocean along the southeastern coast of the United States. We used aerial survey data from 2009 to 2012 provided by the United States Fish and Wildlife Service to identify variables that influenced Black Scoter distribution. We used indicator variable selection to evaluate relationships between Black Scoter habitat use and a variety of broad- and fine-scale oceanographic and weather variables. Average time between waves, ocean floor slope, and the interaction of bathymetry and distance to shore had the strongest association with southeastern Black Scoter distribution.</p>
Black Scoter habitat use along the southeastern coast of the United States
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