Figure 4

Min-Max overview of observation data. Each bar represents one species. The height of a stacked bar corresponds to the maximum one-year count during the 2000–2005 time span. The lower stack indicates the lowest one-year count during this period. The line (corresponding to the right-hand scale) shows the log of the mean abundance of each species over the six year period. The table inset shows the abundance quartiles during each year. The 'Mean' column contains the quartile cut-offs for the six year abundance mean.