To make use of this new forum, I'd like to expand a little on Jeff's answer above, giving a real-world example of why you may need the Thing Editor, the Tax Editor, or both.
Let's say that as of the start of this year, the birding Powers-That-Be recognized a species called "Purple-vented Vireo-Warbler", Vireowarblero purpleoventrio. The species is known to occur throughout Central and South America, but in two forms: the one in Central America has a green underbelly, while the South American one has a blue underbelly. Each form is recognized as a subspecies; the green-bellied form V.p. greenio and the blue-bellied form is V. p. blueio.
The "things" database will have entries for each form: those "things" might have the names "Purple-vented Vireo-Warbler greenio" and "Purple-vented Vireo-Warbler blueio". In addition, there is the species-level "thing" called, simply, "Purple-vented Vireo-Warbler".
On March 1, the AOU's South American Classification Committee, on reviewing the evidence about differences between the two forms, votes to recognize each one as a separate species. The originally described form, with the green belly, keeps the name Vireowarblero purpleoventrio, and the blue-bellied form becomes Vireowarblero blueio, and the common name in English becomes "Blue-bellied Vireo".
Remember, because the "new" species was previously recognized as a subspecies, the "things" database already has a reference for that "thing"; it's just now a full species, instead of a subspecies The SACC taxonomy list would have an entry for "Purple-vented Vireo-Warbler" with the scientific name of Vireowarblero purpleoventrio, and it would be linked to, or pointed at, the thing "Purple-vented Vireo-Warbler".
So the SACC taxonomy would need updating; the name "Purple-vented Vireo-Warbler" would be removed, and the name "Blue-bellied Vireo" (Vireowarblero blueio) would be added, pointing to the thing "Purple-vented Vireo-Warbler blueio". Assuming the NACC followed suit, the AOU list (covering Central America) would likewise be updated to have ITS "Purple-vented Vireo-Warbler" point directly to the thing "Purple-vented Vireo-Warbler greenio". The "thing" formerly simply known as "Purple-vented Vireo-Warbler" would simply not be linked to either taxonomy. In both cases, the checklists for the affected countries would also need to be updated.
Still another possibility is that a species currently found in other areas expands into a jurisdiction covered by a separate taxonomic list. Imagine, for instance, that the Northern Cardinal's range expanded southward dramatically and was now being seen regularly in Columbia. The "thing" Northern Cardinal already exists in the database, and it doesn't exist at all (currently) on the SACC taxonomy list, so no "correcting" is necessary: instead, the SACC taxonomy would just have a new entry, "Northern Cardinal", pointing to the existing "thing" Northern Cardinal.
In other words, if there is already a "thing" which uniquely identifies the "new" species, then only the Tax Editor is needed. However, let's assume that instead, an entirely new species is actually discovered - something that isn't described by any existing "thing". That still happens down in South America. Let's say it's a brand-new species of parrot, the Crimson-tailed Violet Macaw, newly discovered in Peru, not a subspecies of anything already described - just something nobody's seen before. In such a case, first a "thing" would have to be created, and then each taxonomy which covers that geographic area (SACC, Clements, Wells, etc.) would have to have a new entry made to recognize the discovery.
Or, less common nowadays, but still possible: two or more species, each represented by a "thing" in the database, might be lumped into one. If this were 1960, "Slate-colored Junco" (Junco hyemalis) would be a separate species from "Oregon Junco" (Junco oreganus), and each would point to a respective "thing" in the database. When the two species (and others) were merged into "Dark-eyed Junco", a new "thing" was needed, and each of the existing "things" was relegated to subspecific rank.
That's why it's important to know whether taxonomic changes are the result of new species discoveries, range expansions, or lumps or splits of existing species.
Kevin Morgan |