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

Month: August 2008


 [youtube:http://youtube.com/watch?v=rDPY36t7TbA]

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Ever have one of those days when elusive things you’ve been chasing around at top speeds just suddenly fall in your lap? Lisa Owens-Viani is a science writer who works for the San Francisco Bay Estuary Project. She approached us months ago for Martinez beaver photos which went into their recently released report, and decided as an after thought to send me two pages of a federal report generated in the late 90’s.

The title of the report is “Stream Corridor Restoration” and the whole thing is available online. It is the result of laborious work by 15 federal agencies including the EPA, National Park Service, US Geologic Society, and the Army Corp of Engineers. The report is about how to repair damaged streams and restore ecosystems. Guess what chapter 8 recommends for controlling waterflow, reducing erosion, and increasing bird and wildlife?

You guessed!

Beaver dams on headwater streams can positively influence riparian function in many ways, as summarized by Olson and Hubert (1994) (Figure 8.18). They improve water quality by trapping sediments behind dams and by reducing stream velocity, thereby reducing bank erosion (Parker 1986). Beaver ponds can alter water chemistry by changing adsorption rates for nitrogen and phosphorus (Maret 1985) and by trapping coliform bacteria (Skinner et al. 1984). The flow regime within a watershed can also be influenced by beaver. Beaver ponds create a spongelike effect by increasing the area where soil and water meet (Figure 8.19). Headwaters retain more water from spring runoff and major storm events, which is released 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. (8-26)

Where was this report when I was slogging through the environmental section of the subcommittee work? Thanks Lisa for sending it our way. Beaver dams can control water release upstream so that downstream has more regulated flow and less impact for hard rains. Maybe instead of worrying that beaver offspring might go upstream we should be worrying that they might NOT!

I got an email a year ago from our New Zealand Supporter William Hughes-Games suggesting that what we needed was beaver colonies every few miles up the creek to control water release. I initially dismissed this as eco-crazy talk, but after reading more about it I can see that he was right. Beaver ponds catch water, control release, and manage reserves. More about this and a recommendation for a great late summer read will follow. I plan to do some major pouring through this report in the weeks to come, especially about the riparian border recommended for creeks in natural and urban settings.

And speaking of OUR riparian border, the beavers successfully finished toppling a cottonwood tree last night. We saw it hanging by a thread yesterday and talked with Bob Cellini of city staff. He agreed it should be left for the beavers and figured they would fell it the right direction. This morning it is laying neatly in the creek. Our beavers appear to like Cottonwood for dam building, so expect to see some exciting work on the “third” dam tonight. Come check it out!


Doesn’t have a Beaver Festival, doesn’t mean every city doesn’t have beavers!

I was exchanging a series of emails yesterday with Carolyn Jones who asked why I thought beaver stories were increasing at the moment. Was there a population boom? Carolyn is the chronicle reporter whose recent article using the metaphor “the martinez beavers have chewed through 10 million dollars in flood repair” prompted my letter to the editor. The letter was forwarded along to Carolyn and she is the kind of decent reporter that wrote me for clarification. After we settled some facts, (like the flood project never got as far as the beavers home because the city ran out of money), we talked about Elk grove and the Tappel connection. She mentioned that she will be pursuing other beaver stories along the delta and asked what I thought caused the population increase.

Is there a beaver boom? I don’t know for sure, but I do know there’s a beaver-awareness boom, and for that we are largely responsible. The fact is that there have been beavers in Pittsburg and Antioch for as long as I can remember. Jon works at a powerplant out that way and about 20 years ago they had a beaver brought to the lindsay museum because he fell down a pipe and broke his foot. Here in Martinez many people are unaware that we have other beaver colonies; the active one below the Benicia bridge, or the family in residence at Mt. View Sanitation.

Years ago my sister worked at the Bank of Antioch and used to tell me of a particular customer she had who was a beaver trapper. His job was to exterminate beavers in the delta, and he took care of a few hundred every year. This wasn’t freelance either, he was an employee of someone keeping an eye on the watershed, maybe the state, the county or Fish & Game — and he wasn’t the only one, this unit had co-workers. It has been fairly routine to deal with beaver presence by extermination. There was no public outcry, no media response and things continued along these lines unchecked and unnoticed.

Of course, their beavers weren’t in the center of town.

Check out this map of beaver distribution in the United States. It maybe 5 years old, but still considered THE guideline. See how underrepresented beavers are in California? Considering the broad wetlands we have, it is startling that our population is so sparse. Beavers may be coming back to the white areas where they historically belong. Do you know other states, like Virginia and Washington, have actual maps of colony distribution for that state? California is woefully behind in beaver management. I have been told by more than one expert that our Fish & Game position is that “flow devices don’t work” and property owners shouldn’t waste their time.

Beaver issues are going to come up in every town with water eventually. Why not let Martinez be a shining “Beaver Beacon” on the hill, demonstrating how creative problem solving can take care of the people and the beavers, both. My dream is an international website where you enter your postal code and find out the location of the colony nearest you. It could happen. Bill Wainwright recently wrote from France to say that (European) beavers have moved in the stream near his house even though they haven’t been seen there for twenty years.

P.S. Lots of well wishes from our beaver friends, including Skip Lisle and Sharon Brown who wrote to congratulate us on our festival success. Thanks for your support, we couldn’t have done it without you!


We had such a great time this week, I thought I’d share a little beaver funny…

Now this looks like mere silliness until you see these photos from a homeowner in Dallas. Came across these by accident on a random blog. The owners were no friends of the beavers…they wrote about chasing the “filthy creatures” out with a pool scraper, but hey the pictures are worth sharing.

Turns out dispersers make some “creative” decisions…

How much do you bet this fella was thinking, “What a great idea I had! I can’t believe no one ever tried this before.  And they said I wouldn’t make it on my own…”


In case you missed it today, our first ever beaver festival was a resounding success. Hundreds of visitors, lots of supportive new members, many successive crowded beaver tours, photographer from the Times, news from channel 11, and our friendly documentarian to name just few. There were many lovely entries in the tail contest, and great support for the raffles and display tables. Friends of Alhambra Creek, Lindsay Museum, Mt. View Sanitation, John Muir National Parks and the Marin Native Museum could barely keep up with the traffic. Frogard Butler brought clay and did beaver sculpting with the children, and Cheryl had some success with the video letter although many were too shy to say much. Mark Ross was there and was very impressed, and when we went to dinner afterwards to celebrate our success Tim Tucker took the picture. It was a grand day, and everyone should be proud. Thanks to each member and non member who helped out, and thanks Robert Rust for baking your lovely beaver breads. Pictures will follow, sleep now.

Update: Why can’t all articles be like this one? Thanks Simon!

Some initial treats from our tail contest: Thanks to photographer Erika Goldstein, Ph.D.

more to come…oooh these are really cute!  Winners TBA but expect to see a slideshow soon.

BEAVER FESTIVAL XVI

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Beaver Alphabet Book

TREE PROTECTION

BAY AREA PODCAST

Our story told around the county

Beaver Interactive: Click to view

LASSIE INVENTS BDA

URBAN BEAVERS

LASSIE AND BEAVERS

Ten Years

The Beaver Cheat Sheet

Restoration

RANGER RICK

Ranger rick

The meeting that started it all

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