[Qgis-user] Merging shapefiles

[Pat Brown]

I have a number of shapefiles showing the distribution of various plants.
The distribution data are in the form of polygons as they are recorded by
quarter-degree square (QDS). I want to find out how many species are
present in each QDS. What is the best way to do this? Should I first merge
the shapefiles? is there a way to do this without merging? What would be
the advantages of merging? There are about 200 shapefiles. Many thanks
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