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I’d assume that evolution in salmon is just not fast enough to catchup with the dam. EDIT: I don’t mean that as a joke. I think on the timescale of evolution t
by baxtr 2y ago
I’d assume that evolution in salmon is just not fast enough to catchup with the dam.
EDIT: I don’t mean that as a joke. I think on the timescale of evolution the dam was never there.
- mulmen 2y agoOk but the first generation to hit the dam died there and had no offspring. Any salmon spawning in these streams have no connection to pre-dam salmon.
- baxtr 2y agoRight. But their genes do. You assume: hit the dam > died.
- mulmen 2y agoYeah pretty much. That’s why the dams were breached.
- baxtr 2y agoAnd why there still left then?
- jimnotgym 2y agoNo it isn't. The remaining salmon population spawned below the first dam because their habitat was cut off. This reduced spawning and juvenile habitat meant less salmon. Now they have the whole river they are spreading out and the numbers can increase again