DOI: 10.5061/dryad.2280gb61b
title: Data from: Spring temperature predicts upstream migration timing of invasive Sacramento pikeminnow within its introduced range

description: 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 native fishes. Managing conditions that reduce pikeminnow
 co-occurrence with native fishes (i.e., decreasing river temperature)
 could increase the amount and duration of predator-free habitat for native
 fishes. We predict invasive pikeminnow will have larger impacts on invaded
 riverine communities with global warming and increasing drought severity.
 Knowledge of life history and phenology, for pikeminnow and other
 organisms, can guide effective management as conditions change and help to
 limit adverse impacts of introduced organisms on native species.
description: 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. 
description: # 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 clock. temp: degrees Celsius recorded hourly. ### "temp\_model.csv" This .csv includes the data used to create our temperature model for the upper South Fork Eel River. Each row on this dataset corresponds to a temperature sensor in a given year. The columns in this dataset include: dist: the linear distance (km) along the stream thalweg of each sensor from the confluence of the South Fork Eel and the Mainstem Eel River. temp: Mean of hourly water temperature calculated from May 15 - July 1 of a given year. Temp column is the mean of hourly water temperature recorded on Maxim iButtons, or Hobo temperature pendants (MS2202) placed well-mixed thalweg locations on the South Fork Eel River within the Angelo Coast Range Reserve meanairtemp: mean from May 15 - July 1 air temperature recorded at the Angelo Coast Range Reserve weather station. meanq: the mean of stream discharge (M^3/s) from May 15 - July 1 estimated from the USGS stilling well at the southern end of the Angelo Coast Range Reserve (gage ID 114755500) ## Code/Software The accompanying annotated R script "2024_wilderness_temp.R" summarizes the temperature data and adds the timing of arrival of pikeminnow to the temperature datasets. This is the script we used to generate figures used in the manuscript, and includes statistical models for the arrival data of pikeminnow and river temperature in the upper South Fork Eel River. This code runs on R version 4.3.2 (2023-10-31), packages needed to run the script include: tidyverse, lubridate ,scales, ,RColorBrewer, lme4, lmerTest, and MuMIn. To run the script, update the locations of the associated .csv files on your computer.