Pacific (Gavia pacifica) and Yellow-billed Loon (G. adamsii) Mark-Resight Encounter History Data; National Petroleum Reserve-Alaska, 2011-2014

USGS band number on metal tarsus (leg) band. Each band has a unique number assigned by the Bird Banding Lab, Patuxent Wildlife Research Center, Patuxent, Maryland. Bands generally begin with a 3-4 digit prefix followed by a 5 digit suffix, e.g., 1347-59381. The initial capture and banding event and associated band number are reported to the USGS Bird Banding Laboratory in the year of banding and all banding data can be access through the Bird Banding Laboratory. Each bird was also marked with at least 1 plastic color band. Rows with individuals that did not receive a metal band are marked with "N/A".

Every nest in the study areas was given a unique number for individual identification. Each nest identification number is 7 digits long. The first 2 digits represent the year the nest was found (2011=11), the middle 3 digits are letters representing the initials of the researcher that found the nest, and the last 2 digits are a sequential number of nests the researcher found. Loons that did not receive a metal band were referred to using their Nest ID Number.

Represents the 4 digit encounter history for each individual loon. Each digit indicates a year of the study (2011, 2012, 2013, 2014). If an individual loon was resighted in that year, it also represents the loon breeding status. The first none zero in the encounter history is the year of initial loon capture. A zero indicates that the loon had not been captured yet, or was not resighted. Numbers >0 represent the breeding status of a resighted loon. 1=non-breeding loons on territory, 2=unsuccessful breeders, 3=successful breeding loons. Successful breeding loons were defined as adult loons that had chicks survive to at least 3 weeks of age. An example encounter history is 0312. This means the loon was originally captured and successfully produced chicks in 2012. In 2013 the loon did not attempt to breed, and in 2014 the loon attempted to breed but the nest failed or chicks died before 3 weeks of age.

Differentiates between loon species. A 1 in this column indicates Pacific loons.

Differentiates between loon species. A 1 in this column indicates Yellow-billed Loons.

A field to differentiate between the two study sites (Chipp North and Chipp South)

Mass of an individual loon relative to the mean of its species-sex class. Standard z-scores (z = (mass-mean) / SD) for each loon species-sex class generates a distribution with a mean of zero and a SD of 1. For Pacific Loons of unknown sex (n = 9) we used the mean mass for the species. Loons of unknown mass (n = 4) were given z-scores of 0.