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Largest Dam Removal in History
07-24-2016, 11:44 AM #16
White Ribbon call me
Posts:9,779 Threads:371 Joined:Apr 2013
orgazmo3.gif that's a lot of beaver for the eyes.. Hill was probably reading it when she had her seizure..

blink.gif
07-24-2016, 11:52 AM #17
Octo Mother Superior
Posts:42,804 Threads:1,471 Joined:Feb 2011
orgazmo3.gif she's totally in to beavers I hear
07-24-2016, 05:00 PM #18
UniqueStranger Art in my heart
Posts:14,980 Threads:425 Joined:Jun 2012
(07-24-2016, 11:23 AM)Octo Wrote:  I was just reading about beavers and had to bump this thread again.

Evidently not all damn dams are detrimental to fish.

Effects on fish

Beaver ponds have been shown to have a beneficial effect on trout and salmon populations, in fact many authors believe that the decline of salmonid fishes is related to the decline in beaver populations. A study of small streams in Sweden found that brown trout in beaver ponds were larger than those in riffle sections, and that beaver ponds provide habitat for larger trout in small streams during periods of drought.[63] These findings are similar to several studies of beaver effects on fish in North America. Brook trout, coho and sockeye salmon were significantly larger in beaver ponds than those in un-impounded stream sections in Colorado and Alaska.[64][65] In addition, research in the Stillaguamish River basin in Washington state, found that extensive loss of beaver ponds resulted in an 89% reduction in coho salmon smolt summer production and an almost equally detrimental 86% reduction in critical winter habitat carrying capacity.[66] Migration of adult Atlantic salmon (Salmo salar) may be limited by beaver dams during periods of low stream flows, but the presence of juveniles upstream from the dams suggests that the dams are penetrated by parr.[67] Downstream migration of Atlantic salmon smolts was similarly unaffected by beaver dams, even in periods of low flows.[67] Two year old Atlantic salmon parr in beaver ponds in eastern Canada showed faster summer growth in length and mass and were in better condition than parr upstream or downstream from the pond.[68] The importance of winter habitat to salmonids afforded by beaver ponds may be especially important (and underappreciated) in streams without deep pools or where ice cover makes contact with the bottom of shallow streams.[67] A 2003 study showed that Atlantic salmon and Sea trout (S. trutta morpha trutta) spawning in the Numedalslågen River and 51 of its tributaries in southeastern Norway were unhindered by beaver.[69] In Norway, beaver dams are considered beneficial for Brown and Sea Trout populations (these are potamodromous and anadromous forms of the same species). There, beaver ponds produce increased food for young fish and provide refugia for large adults heading upstream to spawn.

https://en.wikipedia.org/wiki/Eurasian_b...ts_on_fish

Sorry about the wall of text

Everything has an ecological role to play, but the fish (salmon) have to get to the stream in the first place, hence fish ladders are a vital necessity.

I was reading about wolf and bear activity that creates balance.



I have no issue reading walls of text, but typing them, uh nah...I try to get to the point.



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