Add line break to axis labels and ticks in ggplot

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You can add your own formatter ( see scales package for more examples). Here I replace any space in your x labels by a new line.

addline_format <- function(x,...){
    gsub('\\s','\n',x)
}

myplot + 
    scale_x_discrete(breaks=unique(df_M$variable), 
    labels=addline_format(c("Ambystoma mexicanum", 
                        "Daubentonia madagascariensis", "Psychrolutes marcidus")))

enter image description here

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