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On 2016, Jun 25, , at 06:59, Richard Tarara <rtarara@saintmarys.edu> wrote:
Based on some relatively recent ecological trends, I wonder how disruptive canals are/were to animal migrations. At least out West there is a rising awareness to the importance of keeping migration routes viable to the point of building animal crossings over interstate highways. It would seem that canals offer a fairly serious barrier since there are no suitable fording locations as would be found with rivers, but of course today we could build the same kind of crossings that are showing up over the highways.