Because the beaver isn't just an animal; it's an ecosystem!

Category: New Species


This fantastic picture by Cheryl Reynolds shows two kits crossing the dam in different directions: (this is apparently why you see logging trucks on the highway going both ways!) It also explains why there were complaints that beavers were taking trees and yet alarm at the re-planting of trees, concern expressed that beavers would interfere with steelhead, and now disbelief that the steelhead are really in the creek at all.

“My mind’s made up. Don’t confuse me with the facts.”

This “position of imposition” was re-illustrated with a tale told me last night by a beaver regular. Apparently he was hard at work on his usual filming and was pleased that the property owner approached him in a cordial and chatty way. (Mind you this is the same property owner who said the blackberry bushes on his bank never produced fruit…check the photo in the frame). He eventually observed that he thought “people were putting new animals in the creek” and remarked that there were mink farms “and one could have been placed here.”

This, I assume, in an effort to disprove the improving effect of the beavers on the creek by accusing beaver supporters of “planting” habitat evidence. Nevermind the “Keystone Species” nonsense. Bring in the “Keystone Cops.”

Maybe the mink and the steelhead were brought in by hand. Maybe the otter was someone’s pet. Maybe the green heron and the kingfisher were smuggled down in a pillowcase and stapled to the branches to make them stay. Maybe the turtle was forced by well-meaning county workers to lay her eggs there against her will.

Maybe making still pools that trap increasingly rich sediment doesn’t really affect a creek at all.

This reminds me of another conversation with the city. We were describing our idea of putting little video snippets of human visitors to the dam in a “whose watching our beavers now?” segment. Staff agreed it would be interesting, with the caution added “If they were legitimate”. Implying they might not be. As if we would write a script, find actors, direct the scene and have them “pretend” to be visiting from Minnesota or Wisconsin and comment on enjoying the beavers.

The mind reels.

The willingness to believe anything but what you actually see is a deeply cynical mindset that cannot be challenged or even influenced with facts. We can’t show the animals that visit the creek if watchers are going to assume they were brought in by truck and released out of a cage the moment before the camera rolled. We can’t even introduce them to our vast field of human visitors if it is assumed that they are all in costume, “pretending” to care about beavers for their acting debut. That is the point. The facts (which challenge the belief) are rejected and don’t matter.

I will say this though; as frusterating as those examples of incredulity are, (and they provoke real outrage in this particular woman who has tried to tranparently document things from the beginning) they attribute to us a lot of power: think of it! Armies of exotic animals (perhaps the entire lindsay museum!) at our disposal, busloads of actors to impersonate actual visitors, and hours of free time to make all this stuff up.

Never mind the logic that says if we had the luxury of scheming and pretending an entire ecosystem we wouldn’t post grainy videos that were taken at an ungodly hour of the morning. We’d sleep in until eleven and go to the studio after a leisurely breakfast of croissonts, browsing the endangered species list before chosing our animal star of the day.

Sigh. Until that enviable day of arrives, we will have to settle for real animals and real people who take time out of their real lives to notice the impact that these beavers have had on this creek.

That will have to do for now.


The Martinez media-hounds (aka the Martinez Beavers) are facing a sore challenge on the publicity front.  Check out the local press, which apparently has tons of free time on their hands at the moment. FoxReno news media and CBS5. Lets get everyone wondering what’s coming next.


13 of them to be precise. Yesterday our intrepid county recorder’s office “turtle godparents” helped a baker’s dozen of these little creatures out of the tanbark and into the water. We were almost past hoping that their laying would come to fruition, but yesterday they were passing out candy cigars at the office. Congratulations mama turtle for picking a fabulous reproductive spot! We’ll keep an eye on the little ones for you.


Tonight an unsuspecting boy disturbed a yellow jacket nest near the footbridge and was chased into the park and stung 11 times. I have let city staff know to take care of the nest, but in the mean time use caution around the Amtrak side of the footbridge and let others know to be careful too.

(I guess it would be wrong to just leave the nest there to welcome the deconstruction crew who comes to scape back the beavers’ foliage, right? Just asking…)


Now the state of Washington has a lot of wetlands, and has learned a thing or two (often the hard way) about water management. I wonder what they recommend for managing creeks and streams in urban and rural areas? Check out this report, sent to me by our beaver friend Jake Jacobsen, Watershed Steward of Stillaquamish County. It lists a series of techniques for restoration of streams, channel modification, salmonid spawning gravel, and nutrient supplementation.

Check out technique 8 on the list: “Beaver re-introduction.”

This exhaustive report, offered by the Washington department of Fish & Wildlife (notice the difference already?) documents the postive effects of beavers on waterways;

2. PHYSICAL AND BIOLOGICAL EFFECTS

Successful reintroduction of beaver has demonstrated: 1) an elevated water table upstream of the dam, which in turn improves vegetation condition, reduces water velocities, reduces bank erosion, and improves fish habitat (increased water depth, better food production, higher dissolved oxygen, and various water temperatures), 2) reduced sedimentation downstream of the dam, 3) increased water storage, 4) improved water quality, and 5) more waterfowl nesting and brooding areas. These effects, at the landscape level, influence the population dynamics, food supply, and predation of most riparian1 and aquatic species. Beaver dams on coastal streams increase landscape-scale habitat diversity by creating a unique wetland type for that area.

Beaver ponds can alter water chemistry by changing adsorption rates for nitrogen and phosphorus, by trapping coliform bacteria, and by increasing the retention and availability of nitrogen, phosphorus and carbon1. Beaver-altered streams also cause taxonomic and functional changes in the benthic macroinvertebrate community due to the effects of impoundment and subsequent alteration of water temperature, water chemistry and plant growth. Beaver can also influence the flow regime within a watershed. Beaver ponds can improve infiltration and ground water storage by increasing the area where soil and water meet. Headwaters can retain more water from spring runoff and major storm events and release it more slowly, resulting in a higher water table and extended summer flows. This increase in water availability, both surface and subsurface, usually increases the width of the riparian zone and, consequently, favors wildlife communities that depend on that vegetation. The richness, diversity, and abundance of riparian-dependent birds, fish, herptiles, and mammals can increase as a result. Beaver ponds are important waterfowl production areas and can also be used during migration. In some high-elevation areas of the Rocky Mountains, these ponds are solely responsible for the majority of local duck production

In addition, species of high interest, such as trumpeter swans, sandhill cranes, moose, mink, and river otters, use beaver ponds for nesting or feeding areas3. Beaver ponds also provide very important salmon habitat in western Washington and Oregon. Juvenile coho and cutthroat are known to over-winter in beaver ponds and the loss of beaver pond habitat has resulted in the loss of salmon production potential.

Oh where was all this information when I was writing my part of the subcommittee report? Well, now you know I wasn’t making that stuff up. Just a reminder that our beavers are not available for relocation. You other cities will just have to find your own.

As if all that wasn’t reason enough to invest in the beavers, check out the new prominent campaign issue for Martinez City Council.

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