DOI: 10.5061/dryad.8kprr4z1w
title: Assessing movement patterns of the highly invasive Western Mosquitofish (<em>Gambusia affinis</em>)

description: The Western Mosquitofish is among the top 100 invaders in the world, yet
 continues to be introduced globally for mosquito control. This study
 investigates the movement patterns of the Western Mosquitofish and
 develops movement predictions for their continued invasion. Our results
 reveal that small-scale and short-term movements by invasive Western
 Mosquitofish are predictable using existing statistical models. However,
 movement over larger scales and longer timelines was consistently
 underpredicted by existing models, suggesting our current understanding of
 invasion capacity by Western Mosquitofish is limited. We used sensitivity
 and optimization methods to identify parameter adjustments that make
 existing statistical models relevant for broader-scale invasions, and we
 illustrate the improved inference gained from this approach by modelling
 the future spread of a recently invaded region. Our results provide
 quantitative estimates of Western Mosquitofish invasion across a range of
 contexts and can direct conservation and management actions aimed at
 improving invasion monitoring, predicting risk of secondary spread, and
 understanding invasion dynamics at multiple spatiotemporal scales. Data
 includes GPS data and movement of fish through manmade systems,
 first-order streams, and larger-order rivers. Data utilizes the fish move
 model to predict and analyze the mosquitofish movement.
description: # Assessing Movement Patterns of the Highly Invasive Western Mosquitofish
 (*Gambusia affinis*) ## Notes on missing data Cells containing “n/a” or
 left blank indicate unavailable values. The overall dataset structure,
 column names, and sheet formats were preserved exactly to maintain
 compatibility with the analysis code provided (Ch3.R). ## Files included
 in this dataset * **CH3.xlsx** — Primary data file containing
 mark–recapture data collected across four movement studies in College
 Station, Texas. * **Ch3.R** — R code containing all analyses and functions
 used in the paper. ### Sheet names and variables * **wc1** —
 Mark–recapture data for fish in White Creek (spring season). * **h1** —
 Mark–recapture data for fish in Hensel Creek (spring season). * **h2** —
 Mark–recapture data for fish in Hensel Creek (summer season). * **w2** —
 Mark–recapture data for fish in White Creek (summer season). * **allnew**
 — Combined dataset for all mark–recapture events across sites and seasons.
 * **exp_obs** — Expected and observed distances moved for recaptured fish.
 * **meso** — Fish movement data from Cote et al. (2010). * **meso_obs** —
 Expected and observed distances moved (m) (Cote et al. 2010). *
 **nebraska** — Movement data from Lynch (1988). *
 **Perkin_idea_revisions** — Augmented movement data used to generate
 improved model predictions for large river systems. #### Variables
 included in this dataset * **stream**: stream where fish were collected *
 **code**: unique ID for each recaptured fish denoting stream, season,
 recapture event, recapture seine haul, and number of fish recaptured in
 each seine haul * **date**: date recaptured * **color**: colour and body
 location of Visible Implant Elastomer (VIE) tag on each recaptured fish *
 **lat**: GPS latitude coordinates * **long**: GPS longitude coordinates *
 **M/R**: M denotes the row is the GPS coordinates for where a specific
 colour of the VIE fish was marked; R denotes the row is the GPS
 coordinates for a specific recapture event of a fish * **sex**: sex of the
 recaptured fish * **time(d)**: number of days between tagging a fish and
 when it was recaptured * **time_d**: number of days between tagging a fish
 and when it was recaptured * **dir_moved**: direction recaptured fish had
 moved (upstream or downstream) * **dis_moved**: distance a recaptured fish
 had moved (m) * **TL**: total length of recaptured fish (cm) * **SL**:
 standard length of recaptured fish (cm) * **BH**: body height (cm) *
 **BA**: body area (no units, as measurement is relative to body size) *
 **HD**: head depth (cm) * **CPL**: caudal peduncle length (cm) * **CPD**:
 caudal peduncle depth (cm) * **CFH**: caudal fin height (cm) * **CFA**:
 caudal fin area (no units, as measurement is relative to body size) *
 **RBH**: relative body height (no units, as measurement is relative to
 body size) * **RCFA**: relative caudal fin area (no units, as measurement
 is relative to body size) * **ARC**: caudal fin aspect ratio (no units, as
 measurement is relative to body size) * **BLS**: body lateral shape (no
 units, as measurement is relative to body size) * **CPT**: caudal peduncle
 throttling (no units, as measurement is relative to body size) * **RPL**:
 relative peduncle length (no units, as measurement is relative to body
 size) * **dis_day**: rate of movement (m/d) * **season**: season the fish
 was recaptured during * **component**: whether the subset of fish is part
 of the mobile or stationary component of the population * **mean**:
 average distance moved (m) by the mobile or stationary component of a
 population * **lower**: lower bound of distance moved by mobile or
 stationary component (95% CI) * **upper**: upper bound of distance moved
 by mobile or stationary component (95% CI) * **exp_or_obs**: whether the
 given distance was from the observed mark–recapture study or expected
 movement predicted using the movement model * **up_or_down**: whether fish
 movement was in the upstream or downstream direction * **order**: river
 order (stream order from 1-9) * **time_y**: time (years) * **direction**:
 direction recaptured fish had moved (upstream or downstream) *
 **distance_m**: distance moved (m) * **augment**: augmented prediction of
 fish movement (m) to account for increased movement in large-order rivers
 * **obs_mean**: mean distance moved (m) from observed data *
 **obs_lower**: low boundary of distance moved (m) from observed data *
 **Obs_upper**: upper boundary of distance moved (m) from observed data *
 **exp_mean**: mean distance moved (m) from expected data * **exp_lower**:
 low boundary of distance moved (m) from expected data * **exp_upper**:
 upper boundary of distance moved (m) from expected data *
 **model_from_RW**: output of movement distance (m) from Randinger and
 Wolter Fishmove Model * **back_transformed**: distance moved (m) once
 accounted for steam size and time * **site**: specific stream that fish
 were collected from * **time**: time (d) between release and recapture of
 fish in the mesocosm study * **river**: specific river fish were tracked
 in in Nebraska case study * **SO**: stream order of various collection
 sites (stream order from 1-9) * **number**: arbitrary number given to each
 of the data points for graphing