Spring temperature predicts upstream migration timing of invasive Sacramento pikeminnow within its introduced range

Rapid climate change and invasive species introductions threaten ecological communities across the globe. Freshwaters are particularly vulnerable and impacted, especially when these stresses coincide. We document the migration of an invasive piscine predator, the Sacramento pikeminnow (Ptychocheilus grandis), within its introduced range, the South Fork Eel River, California, USA. Snorkel surveys and temperature monitoring in 2015–2019 showed that pikeminnow migrate upstream during spring and early summer, with earlier migration in warmer years. We developed a statistical temperature model to forecast the timing and extent of upstream migration by pikeminnow under varying combinations of discharge and air temperature. Modeled river temperature increased with air temperature and downstream and decreased with discharge. In years with low discharge and high air temperature, we predict pikeminnow will move upstream earlier, increasing spatial and temporal overlap in their summer range with n..., This data consists of 1) Daily temperature data for Wilderness Lodge Pool 2) arrival time of Sacramento pikeminnow at Wilderness Lodge Pool, and 3) Statistical temperature model that includes discharge, river position, and air temperature. For detailed methods and site descripts see methods seciton and supplemental information of associated manuscript. , , # Spring temperature predicts upstream migration timing of invasive Sacramento pikeminnow within its introduced range

[https://doi.org/10.5061/dryad.2280gb61b](https://doi.org/10.5061/dryad.2280gb61b)

This study examined the relationship between the timing of pikeminnow migration and river temperature in the upper South Fork Eel River.

## Description of the data and file structure

Hourly temperature data was collected with either Maxim iButtons, or Hobo temperature pendants (MS2202), and is included in the csv files \"wilderness*temp.csv\" and \"temp_model.csv\"* which are described below.

### *\"wilderness\_temp.csv\"*

This .csv includes temperature data from 2015-2019 collected at the well-mixed outflow of our focal study pool, Wilderness Pool (39.74075, -123.6333), located on the South Fork Eel River in the Angelo Coast Range Reserve, Mendocino Co.

The columns in this dataset include:

year: integer year

date_time:  is formatted MM/DD/YY HH:MM with the hour and minutes in 24hr cloc...