Tag: "beaver" at biology news
Wolves gone, western ecosystems suffer
...n, and better food web support for everything from beaver
to river otter, fish, birds, amphibians, and insects. Biodiversity will increase and rising beaver
populations will lead to even more changes, including sediment retention, wetland maintenance and nu...
Hudson's Bay Company fur trapping policies set stage for modern environmental struggles
...ouldn't succeed. It had to expand because its old beaver
trapping grounds were in decline and this expansio... fur-trading empire. And later, when the supply of beaver
pelts began to decline, the company began switching its focus from furs to firs. Export of commoditi...
Wolves' top-down effect
Willow trees, riparian willow warblers and beaver
dams once were bountiful in an area near the town ...also found that as elk populations climbed, active beaver
lodges declined, probably because beavers could no longer find sufficient trees with which to build ...
Proposal would allow wild animals to roam North America
... As a result, along winter elk ranges in Colorado, beaver
populations have declined by 80 to 90 percent. With fewer beavers to create dams that raise water tables, fewer wetlands developed to support willows. Today, there are 60 percent fewer willows in parts of Colorado where beavers have declined. Simila...
Beaver dams create healthy downstream ecosystems
...ream. Researchers have found that ponds created by beaver
dams raised downstream groundwater levels in the C... Colorado River. They noted that water diverted by beaver
dams is forced out of the natural stream channel and spreads across and down the valley for hundreds...
Beavers helping frogs, toads survive
...he culvert-clogging dams it builds on streams, the beaver
is an ally in conserving valuable wetland habitat ...nd toad choruses are only present on streams where beaver
dams are present. While surveying the calls of male frogs and toads engaged in acoustic displays for...