SODERBERGD said:
Sure is scary, isn't it? They both start out heavily blotched. Many of the bloods have the quadra linear stripes like some obsoleta rats. They both drastically change color from neonate to adult. They both have uncheckered bellies (not all bloodreds) and fading lateral patterns (if any). Of course, I refer to the yellow rats since the original bloodred stock is so far out of the everglade's range, but the parallels are impossible to ignore. No other corn morph does that metamorphic change so drastically. Few (if any) other corn morphs show phenotypic markers in the F1s like the bloods. If we look more closely at some of the physiological distinctions of these species, we might even see other parallels. I haven't looked closely at scale size, shape and texture. Anyway, if we start doubting the purity of some of these oddballs that show up now and then, consider how much bloods behave like the yellow rats. I don't think we'd have to stretch our imaginations to presume that 500,000 years ago, perhaps none of the serpents today even existed. Not in color and patten anyway. Selective breeding isn't limited to the same species. A hybrid can give rise to the next successful serpent out there in situations of climatic change. These "freaks" we see occasionally could be throwbacks to those times, but we'll probably never know now that the human element is poluting the equation.
Don, you're getting philosophical now!
You do make a very interesting point about the bloodreds. I'm trying to think of a corn that goes through that much of a color change---and I'm coming up blank.
Thinking about this, don't most rat snakes (black, yellow, gray, and everglades) start off looking totally different from their adult counterparts?
I want to say that yellow rats start off gray looking, and then become yellow and develop their lines, no?
Here's a picture of a hatchling/juvie everglades, which shows exactly what you're talking about.
So, the questions is---why are the bloodreds the only corns to act this way?
That, is something that unfortunately nobody is ever going to be able to prove, one way or another. The problem is that everglades habitat overlays with the yellow rats and they intergrade, as do the gray and yellow rats in northern florida.
My guess is that whenever the keys split off of florida, you had some confined population of everglades rats, and corns, hell, maybe even yellow rats. That really is the only thing that makes sense when you sit down and think about it. A confined population of naturally intergrading snakes will eventually just form a new species---and there you have Upper Keys corns. It's a nice theory, but again, totally unproveable.
Still though, there's so many 'looks' of bloodreds that really do scream rat snake, and not corn snake. But again, then you get the problem that everglades rats aren't native to really any area above Lake Okeechobee--so that conflicts with the area where bloodreds were found.
So after all of that, where do we end up? Right back at the beginning, with more questions than answer. But hey, what do you expect? Isn't that what's so fun about this?