Hi Charles,
Can I add to Harold's query, as I've heard several instances now where there's confusion about this (including my own). What Harold is trying to do is determine which taxa occur in specific biotopes. When using the report wizard, it is possible to generate a report about biotopes, but the Taxon fields don't appear in this, which means, for instance, if you have a biotope of woodland, it appears to be impossible to generate a list of taxa that occur in woodland. Similarly, the biotope fields don't appear when you're generating a taxon report. It is possible in the wizard to list measurements and filter for specific features of the site, but this generally isn't associated with a specific taxon. For instance, a particular woodlouse might be found in a wall in a woodland. The wall and woodland might be topographical features listed on the site record, but there is apparently no way to state which of these features the taxon was located.
I've no doubt that, as this is such a fundamental analytical tool in zoology, it's possible to do, but I can't work out how to do it. Hope you (or someone) can help.
Alistair