Seasonal dynamics of juvenile coho salmon (Oncorhynchus kisutch) in wetlands of the North Thompson River, British Columbia
Data files
Jan 29, 2025 version files 10 KB
-
growth_with_abiotics.csv
1.82 KB
-
mark_recapture_data.csv
2.91 KB
-
mean_fork_length.csv
2.80 KB
-
README.md
2.48 KB
Abstract
Freshwater fish such as juvenile salmon often rely on dynamic and diverse habitats. The importance of freshwater wetlands to juvenile coho salmon in large river networks is not well known. We studied three wetland sites along the North Thompson River, British Columbia, Canada, from May 2021 – May 2023 to understand how seasonal variation in wetland connectivity and water quality influence juvenile coho salmon habitat use. We used monthly mark-recapture sampling to estimate juvenile coho salmon abundance. Seasonal dynamics of juvenile coho salmon in wetlands were intertwined with connectivity and abiotic conditions. Age-0 juvenile coho salmon recruited to wetlands during spring high flows and used wetland habitats year-round. Periods of high density and low oxygen were associated with lower growth and abundance. In addition, our study provides information on the timing of juvenile coho salmon use of wetland habitats which can be used to inform habitat managers of times of year that pose the greatest risk and benefits to these fish.
README: Seasonal dynamics of juvenile coho salmon (Oncorhynchus kisutch) in wetlands of the North Thompson River, British Columbia
https://doi.org/10.5061/dryad.0gb5mkmbw
Description of the data and file structure
Details of the data collected are provided in the manuscript.
Files and variables
File: growth_with_abiotics.csv
Description:
Variables
- site: Name of wetland
- year: Year sampling took place
- density: Density estimate of juvenile coho from the mark-recapture model (fish / m^2)
- start_date: Start date of growth period (one sampling period to the next)
- end_date: End date of growth period (one sampling period to the next)
- atu: Accumulated thermal units (ATU) by summing the daily average temperatures within a growth period.
- mean_min_do: Average daily minimum dissolved oxygen (DO) (mg⋅L-1) was calculated by averaging the lowest dissolved oxygen values of each day during growth periods.
- cohort_n: Number of fish used in the pooled sample growth calculation
- cohort_msgr: Mass standardized growth rate for the pooled sample group (% growth in mass⋅day-1)
- cohort_sd_msgr: Standard deviation of mass standardized growth rate for the pooled sample group (% growth in mass⋅day-1)
- mean_PIT_msgr: Mean mass standardized growth rate for PIT tagged fish (% growth in mass⋅day-1)
- sd_mean_PIT_msgr: Standad deviation of mean mass standardized growth rate for PIT tagged fish (% growth in mass⋅day-1)
- n_pit: Number of PIT tagged fish used in the calculation of mean mass standardized growth rate for PIT tagged fish
File: mark_recapture_data.csv
Description:
Variables
- site: Name of wetland
- year: Year sampling took place
- month: Month sampling took place
- catch_type: Mark Recapture event or Index sampling event.
- u1: Total catch on capture event 1 for month i
- R: Marks applied on capture event 1 for month i
- r: Marks detected on capture event 2 for month i
- u2: Unmarked fish detected on capture event 2 for month i
- mr_area: Area of wetland at time of sampling (m^2)
- date: Date of sampling event
File: mean_fork_length.csv
Description:
Variables
- site: Name of wetland
- year: Year sampling took place
- jday: Julian date
- assigned_age: Assigned age from scale analysis
- mean_fl: Mean fork length (mm)
- sd_fl: Standard deviation of mean fork length (mm)
NA - Not applicable