Yep- they are parameters which PREVENT species fro m ,ovong beyond their own kind, and invovle upper limits which are designed to keep the species fit and within it’s own kind- these limits are not unknown to science and breeders- These limits are designed into several systems, and htye all work in unison.
Good enough? Or do you require an impossible to define scientific verbiage? If you wish to argue there are no limitaitons- or were none, then you’ll have to provide evidnece species can and do receive non species specific information that allows them to move beyond their own kinds- We know they do not, and that mutaitons, shifts, translocations etc all work within species specific design parameters, and we know that any ‘changes’ amount to simple microeovlutionary adaptations that work on info already present ie: Beaks are ‘selected for’ (Actually, there is no ‘selecting’ going on) that are longer so as to reach deeper nectar while short beaked birds die off- however, these birds are NOT gainign significant morphological changes not specific to that species- IF they could, then parameters could not be argued- however, since species do not- nay- can not- significantly change morphologically, and any changes witnessed all fal lwithin the parameters, we know upper limits exist and is afact.
I find it interesting that you mention breeders as evidence against evolution, since Darwin formed his theory of natural selection largely by talking about variation and selection with breeders.
Do you have links to any published papers -- preferably technical -- on the "limits"?