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Bio-bullets

How beavers engineered landscapes for bison

Just as prairie dogs facilitate the prairie bison by enriching patches of lawn, perhaps beavers facilitated the wood bison by creating riparian meadows of sweet sedges.

professor caricatureProf. Mumblebard claims: "Because rodents are generally smaller than hoofed mammals, it’s unexpected for rodents to facilitate grazing ungulates. The only possible exception is prairie dogs, which appear to create food for the American bison rather than competing with it. If this qualifies as facilitation, it occurred in a limited area only. Although beavers are perhaps{njaccess 2, 3, 4, 5, 6, 7, 8} the most powerful of rodents, they had little to do with bisons because the former resided in forested valleys whereas the latter migrated on treeless plains."{!njaccess}… See the hidden half of Prof. Mumblebard’s claim by subscribing here{/njaccess}

logoRobin and the Honey Badger respond: "The American bison is indeed at home in the open but its distribution extends across the boreal forests through western Canada to Alaska. As a result, this bison would probably have visited beaver meadows repeatedly along its original migratory routes. Beaver meadows offer herbaceous plants more nutritious than those in the surrounding forests. And sedges, which are common in beaver meadows, are a preferred food of the American bison. The facilitation of{njaccess 2, 3, 4, 5, 6, 7, 8} bisons by beavers may therefore be greater than realised. The European bison, if truly a forest-adapted species, was particularly likely to have benefited from riverside meadows created by the European beaver, particularly in winter. This helps to explain why the remaining populations of European bison have needed supplementary feeding where beavers have been exterminated. Other herbivores foraging in beaver meadows and ponds on both the northern continents include wapiti, red deer and moose/elk. An image search for tourists viewing bisons and other herbivores in forested landscapes: which species is most frequently spotted in beaver meadows?"{!njaccess}… Reveal the hidden half of this response by Robin and the Honey Badger by subscribing here {/njaccess}

 

Please join us here at the Bio-edge with your own comments. In the discussion below we encourage links to any evidence supporting either Prof. Mumblebard or Robin and the Honey Badger. Illustrations are welcome but please cite all sources or we may be forced under copyright to delete your comment.

How beavers engineered landscapes for bison

Last modified on 23 June 2015

Comments   

0 #1 Wildman 2014-02-17 16:42
This is perhaps the kind of scene that RHB have in mind:

0 #2 Zoophile 2014-03-07 12:12
I sure can’t think of any rodent in Africa that you could say facilitates the African plains grazers, least of all buffaloes. There are ground squirrels there, vaguely related to prairie dogs, but they live only in dry areas and they don’t seem to have much impact. I’m not sure a ground squirrel and an African buffalo would ever even use the same habitat although their distributions do overlap.
0 #3 Biodiver 2014-03-07 17:09
@wildman. This video clip is also suggestive because this strip of grassland is obviously alluvial:
www.youtube.com/.../

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