Since about 2000, we’ve been surveying the land snails of a group of small islands in Turkey. In preparation for my current trip there, recently I tallied up the species we have so far collected. Here is a graph showing the number of species found on each island as a function of island surface area (km2).
These types of graphs are customarily done using log units, but our data come closer to a straight line when plotted in ordinary numbers. Island C is clearly an outlier. The main reason for the smaller than expected number of species on island C is probably that I was the only one who collected there on one occasion, while at least 2 people have collected on each of the other islands on multiple occasions.
Revisiting island C to add 4 or 5 more species to its snail fauna is on top of my list of things to do in Turkey.