Body size and early marine conditions drive changes in Chinook salmon productivity across northern latitude ecosystems

Disentangling the influences of climate change from other stressors affecting the population dynamics of aquatic species is particularly pressing for northern latitude ecosystems, where climate driven warming is occurring faster than the global average. Chinook salmon (Oncorhynchus tshawytscha) in the Yukon-Kuskokwim (YK) region occupy the northern extent of their species’ range and are experiencing prolonged declines in abundance resulting in fisheries closures and impacts to the wellbeing of Indigenous people and local communities. These declines have been associated with physical (e.g., temperature, streamflow) and biological (e.g., body size, competition) conditions, but uncertainty remains about the relative influence of these drivers on productivity across populations and how salmon-environment relationships vary across watersheds. To fill these knowledge gaps we estimated the effects of marine and freshwater environmental indicators, body size, and indices of competition, on the ..., This is a collated dataset of various freshwater indices for Feddern et al. \"Body size and early marine conditions drive changes in Chinook salmon productivity across northern latitude ecosystems\". The authors of this dataset were not the original collectors of these data, but instead collated them from publicly available datasets, reports, and published papers. They are archived here for reproducibility and the original sources should be acknowledged. We are very grateful to the people who originally collected these data and developed the associated models and run reconstructions. The data were collected from: 
Freshwater Covariates
Temperature data derived from Daymet: https://daymet.ornl.gov/ accessed 2022-11-26
Streamflow derived from GloFAS: https://essd.copernicus.org/articles/12/2043/2020/  via https://doi.org/10.24381/cds.a4fdd6b9 accessed 2022-11-26
Complete code can be found at: doi.org/10.5281/zenodo.13696302, , # Body size and early marine conditions drive changes in Chinook salmon productivity across northern latitude ecosystems

[https://doi.org/10.5061/dryad.9w0vt4bqm](https://doi.org/10.5061/dryad.9w0vt4bqm)

## Description of the data and file structure

This repository contains indices of environmental conditions evaluated for their effect on Chinook salmon productivity. 

### Files and variables

#### File: FreshwaterIndices\_Feddernetal.csv

**Description:** Indices of freshwater conditions hypothesized to impact Chinook salmon productivity throughout their lifecycle. Watershed specific indices were developed for 26 Chinook salmon populations across the Yukon-Kuskokwim region from DAYMET and GloFAS models.

##### Variables

* Population: River for which the index was derived associated with a specific Chinook salmon spawning population
* Region: Subregion for which each Population is located
* year: Calendar year associated with the index
* max5dprcp_spawn: Maximum 5-day precipitation...