The temperature is cooler? That can't possibly be the only reason to explain such a dramatic change in survival rates. We definitely need more research on this topic.

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oatmeal1 4 hours ago | parent | next [-]

There's more food, less energy wasted fighting excessively strong current, and more places to hide from predators. Water quality goes up downstream of a beaver(-ish) dam.

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margalabargala 6 hours ago | parent | prev [-]

If you do even a moment of reading about salmon, you will find that they are extremely sensitive to warm temperatures. Even a couple degrees F above their "normal" will allow disease to run rampant.

	▲	declan_roberts 6 hours ago \| parent [-]
		I give the salmon a little more credit because the entire river can't be a beaver dam. That's their theory and I think will more research we're going to learn more about what's happening here.