| ▲ | baxtr a year 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. |
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| ▲ | mulmen a year ago | parent [-] |
| Ok 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. |
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| ▲ | baxtr a year ago | parent [-] | | Right. But their genes do. You assume: hit the dam > died. | | |
| ▲ | mulmen a year ago | parent [-] | | Yeah pretty much. That’s why the dams were breached. | | |
| ▲ | jimnotgym a year ago | parent | next [-] | | No 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 | |
| ▲ | baxtr a year ago | parent | prev [-] | | And why there still left then? |
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