title: Multiple boxplots on one plot with ggplot2
body: <p>Standard R plotting produces 30 boxplots in one plot when I use this code:</p>
  
  <pre><code>boxplot(Abundance[Quartile==1]~Year[Quartile==1],col="LightBlue",main="Quartile1 (Rare)")
  </code></pre>
  
  <p>I would like to produce something similar in ggplot2. So far i'm using this:</p>
  
  <pre><code>d1 = data.frame(x=data$Year[Quartile==1],y=data$Abundance[Quartile==1])
  a &lt;- ggplot(d1,aes(x,y))
  a + geom_boxplot()
  </code></pre>
  
  <p>There are 30 years of data. In each year there are 145 species. In each year the 145 species are categorized into  quartiles of 1-4.</p>
  
  <p>However, I'm only getting a single boxplot using this. Any idea how to get 30 boxplots (one for each year) along the x axes? Any help much appreciated. </p>
  
  <p>There are 30 years of data. In each year there are 145 species. In each year the 145 species are categorized into  quartiles of 1-4. </p>