Migration timing metrics of 11 Atlantic salmon populations in Eastern Canada

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.
..., , # 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 (< 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 migr...,