DOI: 10.5061/dryad.p5hqbzm1h
title: Migration timing metrics of 11 Atlantic salmon populations in Eastern Canada

description: This dataset contains migration timing metadata for Atlantic salmon (Salmo
 salar) populations across 11 rivers in eastern Canada, spanning the
 regions of Labrador, Newfoundland, and the Maritimes. For each site, the
 dataset includes geographic coordinates, the Julian day at which 5 % and
 95 % of the cumulative annual run was reached, and the run-timing modality
 (unimodal or bimodal). Populations vary widely in migration timing, with
 early runs beginning as early as day 145 and late runs extending beyond
 day 288. Bimodal populations, found primarily in the Maritimes, display
 two distinct peaks in migration timing, whereas unimodal populations in
 Labrador and Newfoundland have a single, more continuous run. These data
 provide baseline information on spatial variation in run timing and
 migration modality in North American Atlantic salmon, enabling integration
 with genetic, environmental, and climate projections to investigate the
 ecological and evolutionary drivers of migration phenology.
description: # Migration timing metrics of 11 Atlantic salmon populations in Eastern
 Canada Dataset DOI: [10.5061/dryad.p5hqbzm1h](10.5061/dryad.p5hqbzm1h) ##
 Description of the data and file structure Population-level run timing
 data for Atlantic salmon (*Salmo salar*) were compiled from daily counts
 at fishways, counting fences, or traps over a ~28-year period (1994–2021)
 for 11 rivers across the Maritimes, Newfoundland, and Labrador regions of
 Atlantic Canada. Data included counts of small (&lt; 63 cm fork length)
 and large (≥ 63 cm) salmon, which were combined for analysis due to
 similar run-timing patterns. For each population, early run timing (Julian
 day at 5 % cumulative run), late run timing (95 % cumulative run), and
 run-timing modality (single or multiple peaks) were calculated from the
 aggregated multi-year counts. These metrics were used for downstream
 genomic association analyses. ### Files and variables #### File:
 Becketal_2025_runTiming.csv **Description:**  Population-level migration
 timing metrics for 11 Atlantic salmon (*Salmo salar*) populations across
 the Maritimes, Newfoundland, and Labrador regions of eastern Canada. Each
 row represents a population, with geographic coordinates, run-timing
 descriptors, and modality classification. These data were derived from
 multi-year fishway, counting fence, or trap records (1994–2021). #####
 Variables * SiteCode: Abbreviation for each monitoring site *
 Region_edit: Geographic region in Atlantic Canada where the site is
 located (Maritimes, Newfoundland, or Labrador) * River: Name of the river
 where counts were recorded. * Latitude: Approximate latitude of monitoring
 location in decimal degrees * Longitude: Approximate longitude of
 monitoring location in decimal degrees * perc5_cumjday: Julian day when 5
 % of the cumulative annual run had entered the river *
 perc95_cumjday: Julian day when 95 % of the cumulative annual run had
 entered the river * Modality: Run-timing pattern classification —
 *unimodal* (single peak) or *bimodal* (two distinct peaks) within the
 annual migration. ## Code/software No custom scripts were used to analyse
 this data.  ## Access information Genomic data was derived from the
 following sources: * Bradbury, I. R., Lehnert, S. J., Kess, T., Van
 Wyngaarden, M., Duffy, S., Messmer, A. M., Wringe, B., Karoliussen, S.,
 Dempson, J. B., Fleming, I. A., Solberg, M. F., Glover, K. A., &
 Bentzen, P. (2022). Genomic evidence of recent European introgression into
 North American farmed and wild Atlantic salmon. *Evolutionary
 Applications*, *15*(9), 1436–1448.
 [https://doi.org/10.1111/eva.13454](https://doi.org/10.1111/eva.13454) *
 Lehnert, S. J., Bentzen, P., Kess, T., Lien, S., Horne, J. B., Clément,
 M., & Bradbury, I. R. (2019). Chromosome polymorphisms track
 trans-Atlantic divergence and secondary contact in Atlantic salmon.
 *Molecular Ecology*, *28*(8), 2074–2087.
 [https://doi.org/10.1111/mec.15065](https://doi.org/10.1111/mec.15065) And
 can be accessed
 at [https://doi.org/10.5061/dryad.hdr7sqvfc](https://doi.org/10.5061/dryad.hdr7sqvfc)