Can I clear my iPhone camera roll without loosing any photo?

It seems to me that all photos taken with the iPhone go into:

• the iPhone Camera Roll


• the iCloud photo stream


• iPhoto/Aperture projects (e.g. "Photo stream for Decembre 2014")

Can I clear completely my iPhone's camera roll without loosing any photo?

I.e. will the duplicates in the iCloud stream and in iPhoto/Aperture projects will be deleted or not?

My goal is to free some space on the iPhone while, of course, not loosing anything.