Portal Species Time-Series (Functions)

If surveys.csv, species.csv, and plots.csv are not available in your workspace download them:

Load them into R using read.csv().

First, combine the surveys and species tables into a single data frame.

Then, write a function that:

• Takes three arguments - a data frame (the combined table created in (1)), a genus name, and a species name
• Uses dplyr to produce a data frame with a two columns: year and count, where count is the number of individuals (i.e., the number of rows) for the species indicated by genus and species in that year
• Make a graph of the resulting time-series using ggplot2 that has year on the x axis, count on the y axis, and displays the data as blue points (with size = 2) connected by blue lines (with linewidth = 1). Change the x-axis label to Year and the y-axis label to Number of Individuals

1. Use your function to plot the time-series for genus = "Dipodomys" and species = "merriami"
2. Use your function to plot the time-series for genus = "Chaetodipus" and species = "penicillatus"

Expected outputs for Portal Species Time-Series: 1 2