Yes, I think along the same lines as you.
But I wonder…
No website is going to shun traffic, so it’s unreasonable for one to direct people to only load certain observations only once and to another site.
(for you and I at the very least) it depends on the altruistic behaviour of the user: first recognizing the potential for overlapping records, and then just deciding personally to only upload sightings once.
I’d like to hear from other users to know if this has occurred to them, if they contribute to more than one database, and whether they’ve participated in an ultra rare sighting and later noticed too many records of it.
Obviously GBIF knows there could be one birder (eg), belonging to two database sites, with two different user names, and similar observations. But how to reduce it down enough to recognize that for certain…
Can GBIF reduce the uncertainty down to exact time, location, and observer? Fairly technical exercise I think.
Finally, if there’s a link or list of databases that GBIF uses, it would be most interesting to share!
(I see on their site they do solicit database suggestions, but don’t seem to offer where they get their data… maybe I didn’t dig around enough.)
Thanks to all responders