Readme File This file describes data deposited in DRYAD associated with the manuscript entitled Migration strategy affects avian influenza dynamics in mallards (Anas platyrhynchos) by Hill et al. Metadata filenames: Mallard metadata Text_28Jun2012.txt; Mallard metadata Excel_28Jun2012.xlxs Metadata Column Descriptions: Collection Date: Date on which the field sample was collected. Julian Collection Date: Julian calendar collection day. Month: Month in which field sample was collected. Collection Site: Descriptor of local sampling environment, such as name of wildlife refuge. Country: Country in which original sample was collected. Collection Latitude: Latitude of GPS of site at which original sample was collected. Format: WGS84 Collection Longitude: Longitude of GPS of site at which original sample was collected. Format: WGS84 Host Species: Full scientific name of host genus and species, without abbreviations. Common Name: Host Common Name without abbreviations. Sample Identifier: Unique identifier assigned to each sample collected. Delta Deuterium: Isotope measurement obtained from feather. Delta Nitrogen: Isotope measurement obtained from feather. Delta Carbon: Isotope measurement obtained from feather. Age: Age of bird from which sample taken. HY/AHY (abbreviations for Hatch year/After hatch year) Sex: Male or female. Flat Wing (mm): Wing measurement. Bill Length (mm): Bill measurement. Short Tarsus (mm): Short Tarsus measurement. Weight (g): Weight of animal at sample collection. AIV Status: If Avian Influenza Virus was present in sample then POS, if absent NEG. AIV Subtype: Subtype of Avian Influenza Virus listed if known, 0 if negative. Migration Origin: Migration status of each bird established from isotope signature of primary feather collected in winter. LDM (long-distance migrant), IDM (intermediate-distance migrant), RES (resident/locally-born) or UNK (unknown origin). Sequences Alignments Filename: Mallard HA NA alignments Text June 28 2012.txt This file contains all of the hemagglutinin (HA) and neuraminidase (NA) sequences after alignment. The sequences in FASTA format were saved in a single text file.