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

Category: Beavers and climate change


Let’s say (and why not) that Tuesday night was your regular zoom bridge night with the girls and you missed that fantastic discussion of beaver benefits from the Scotts Valley Watershed Council. You are pretty dam lucky because the following night is going to be pretty beavery too.

Sequoia Park Zoo Hosting Virtual ‘Partnering with Beavers to Heal the Planet’ Lecture on January 20th

The Sequoia Park Zoo Conservation Lecture Series has gone VIRTUAL for 2020/21 and the next virtual lecture is scheduled for Wednesday, January 20, 2021 at 7:00 PM on Zoom and Facebook Live. Environmental journalist Ben Goldfarb will be joining us to present, “Partnering with Beavers to Heal the Planet.” Zoo updates and information will begin at 6:45 PM with the lecture starting at 7:00 PM promptly. As a security feature, lecture attendees are required to have a free registered Zoom account available online at Zoom.us. Prepare ahead of the lecture by logging in and creating your personal Zoom account. On the date of the lecture, simply log in to your Zoom account and then click the provided Zoom link at www.SequoiaParkZoo.net or on our social media. Virtual lecture attendees can ask questions to the speaker at the end of the presentation via the chat box on Zoom or Facebook Live comments. Special thanks to Papa & Barkley for sponsoring the Conservation Lecture Series!

That’s right, Ben at 7 will be talking about how beavers can save the fucking planet, Isn’t that an incredible photo? The beavers in Voyageurs Park have had their way with the park for decades. If it weren’t for the wolves I’d say they are the luckiest beavers alive. Come wednesday at 7 and hear Ben tell you how beavers can save the planet. Or at least parts of it. The info about how to access the conference is here:


Are the flying monkeys finished with their capital pageant yet? Great, it’s over. So we can talk about beavers again. Specifically let’s talk about the CA Beaver Summit, which is shaping up splendidly. I just have to share a little of what’s been falling into place over the past few days.

Take a moment and appreciate the line up for days 1 and 2.

CALIFORNIA BEAVER SUMMIT

Keynote Address Michael Pollock –  NOAA
History of beaver in California Rick Lanman – Historical Ecology Center
Climate change and how beavers can help Jeff Baldwin – Sonoma State
Ecological Diversity & Ecosystems Ben Goldfarb – Author
Beavers for Restoration & Conservaton Damion Ciotti FWS & Maidu tribal – FWS
Common conflicts and how to manage Mike Callahan – Beaver Solutions
Common conflicts local examples Kevin Swift – Swiftwater Design

Doesn’t that look like something you want to attend from start to finish? It’s not even finalized yet and is going to get even better!

Salmonid habitat
Dan Logan & Brian Cluer – NOAA
Beaver, amphibian and meadow restoration Karen Pope – USFS
Low tech process based restoration of riverscapes Joe Wheaton – Utah State
Beavers & Fire Refugia Emily Fairfax – Cal State Channel Is
Human Dimensions of Beaver Management Susan Charnley – USFS
CDFW Policy and habitat Jennifer Rippert –  CDFW
California Beaver Policy and Specific Issues Kate Lundquist – OAEC
Questions, discussion, next steps ALL

Now we just need some website magic and Amelia to art her art! Whoo hoo!


Sigh. Time for some more jealousy fodder from Washington state, this time from Everett and the Herald.

For tribes, climate change fight is about saving culture

If salmon can’t survive, what will happen to a Native culture based on a plentiful supply?

That question is one that drives the Tulalip Tribes’ intense interest in adapting to and slowing climate change. Williams, 72, helped lead the fight for four decades until his retirement in July as head of the Tulalips’ Treaty Rights Office, which he founded. He passed the torch to Ryan Miller, 33.

“If we lose these species that are so intrinsically connected to who we are, we lose part of ourselves,” said Miller, who as a teenager worked at the tribal fish hatchery where his father, Richard, ran the water quality lab. “It’s already difficult to pass on these traditions in modern societies. As these resources get more scarce, it becomes more and more difficult.”

So we are very concerned about our salmon. That means we are going to care a great deal about anything that can help sustain them. Any ideas?

Off-reservation forests include millions of acres of wildlife habitat, salmon-bearing streams and plant resources that are at risk from a changing global environment. This is where tribal rights afforded under the 1855 Treaty of Port Elliott come into play. 

Stewardship includes rebuilding landscapes so they will bounce back from fires and floods. Resiliency is a goal of many Tulalip projects. The tribes work with farmers to keep manure out of waterways, creating clean energy in the process. Staff have relocated nuisance beavers that would build salmon-friendly, water-storing forest ponds. Last summer they helped remove a Pilchuck River diversion dam that has blocked salmon migration for 118 years.

“We have complicated Western water law, and we’re seeing the drought season get longer and longer,” he said. “The population is growing. How are we going to sustain that development with a reduction in water? We already don’t have enough water in the rivers, enough water for salmon.”

Oooh I don’t know. You don’t want to be TOO wise and ecologically minded all at once. I mean it’s one thing to understand salmon. And then how beavers help baby salmon by making these deep pools that don’t freeze or dry up. And then to recognize that the safer and fatter a baby is when it finally swims to sea the better it’s chances of growing up and coming back for people to catch. But do have have to understand climate change too?

That just seems like showing off.

Kay Underwood

My beaver “inbox” is getting crowded again. It seems like at the end of every month these days there are a million beaver stories to catch up on. Weeks ago I flagged this new study to talk about, and other things just got in the way. Today I want to fix that.

This was published in WIREs WATER just after Thanksgiving, and it’s by our favorite English researchers.

Beaver: Nature’s ecosystem engineers

Richard E. Brazier; Alan Puttock, Hugh A. Graham, Roger E. Auster Kye, H. Davies Chryssa & M. L. Brown

Abstract

Beavers have the ability to modify ecosystems profoundly to meet their ecological needs, with significant associated hydrological, geomorphological, ecological, and societal impacts. To bring together understanding of the role that beavers may play in the management of water resources, freshwater, and terrestrial ecosystems, this article reviews the state‐of‐the‐art scientific understanding of the beaver as the quintessential ecosystem engineer. This review has a European focus but examines key research considering both Castor fiber—the Eurasian beaver and Castor canadensis—its North American counterpart.

In recent decades species reintroductions across Europe, concurrent with natural expansion of refugia populations has led to the return of C. fiber to much of its European range with recent reviews estimating that the C. fiber population in Europe numbers over 1.5 million individuals. As such, there is an increasing need for understanding of the impacts of beaver in intensively populated and managed, contemporary European landscapes. This review summarizes how beaver impact: (a) ecosystem structure and geomorphology, (b) hydrology and water resources, (c) water quality, (d) freshwater ecology, and (e) humans and society. It concludes by examining future considerations that may need to be resolved as beavers further expand in the northern hemisphere with an emphasis upon the ecosystem services that they can provide and the associated management that will be necessary to maximize the benefits and minimize conflicts.

Aren’t you thrilled with that opening paragraph? I mean I’m sure any reader of this website knows absolutely everything they are going to say but isn’t it wonderful to have it all in one place?

2 BEAVER IMPACT UPON THE ENVIRONMENT—CONTEMPORARY UNDERSTANDING

We take this opportunity to revisit Gurnell’s (1998) review on the hydrogeomorphological effects of beaver, which provides an excellent foundation for our understanding. Beavers, as ecosystem engineers, have a marked influence upon the terrestrial and riverine environments that they occupy (Westbrook, Cooper, & Baker, 2011). Beavers are primary agents of zoogeomorphic processes; here we acknowledge their influence upon river form and process (Johnson et al., 2020) and discuss recent literature on the impacts of beaver on hydrogeomorphology.

You will want to read this yourself. To my mind we don’t get enough discussion of the beaver impacts on hydrogemorphology. Their lodges, canals and dams change and have changed the structure of streams for centuries. Beaver moved soil grows our crops, fills our valleys and shapes our mountains. Beavers did it all.

Erosion often occurs at the base of dams, due to a localized increase in gradient and stream power (Gurnell, 1998; Lamsodis & Ulevičius, 2012). Woo and Waddington (1990) observed that flow across the dam crest may be concentrated in gaps, enhancing erosion of the stream bed and banks downstream of the dam, forming plunge pools, and widening the channel, respectively. Lamsodis and Ulevičius (2012) observed the geomorphic impacts of 242 dams in lowland agricultural streams in Lithuania; of which, 13 (5.4%) experienced scour around the periphery of the dam.

Beaver dams are also key sites for channel avulsion (Giriat, Gorczyca, & Sobucki, 2016; John & Klein, 2004), as shown in Figure 1. John and Klein’s (2004) study investigated the geomorphic impacts of beaver dams on the upland valley floor of the third‐order River Jossa (Spessart/Germany). Due to the creation of valley‐wide dams, which extended beyond the confines of the bank, multi‐thread channel networks developed across the floodplain. Newly created channels would deviate from the main stream channel, re‐entering the river some way downstream. At the point where the newly created channel enters the stream, a difference in elevation results in the development of a knickpoint. This knickpoint then propagates upstream through head‐cut erosion, eventually relocating the main stem of the channel.

Wow I had to look up a new word in a beaver paper. Avulsion. That doesn’t happen every day.

In sedimentary geology and fluvial geomorphology, avulsion is the rapid abandonment of a river channel and the formation of a new river channel. Avulsions occur as a result of channel slopes that are much less steep than the slope that the river could travel if it took a new course.

Well that is excellent. Thank you for that. Tucking it away right now for future use.

2.2.2 Summary of hydrological impacts

  • Beavers can reduce longitudinal (downstream) connectivity, while simultaneously increasing lateral connectivity, pushing water sideways.
  • Beavers can increase surface water storage within ponds and canals, while also elevating the water table and contributing to groundwater recharge.
  • Beaver dam sequences and wetlands can attenuate flow during both high and low flow periods.

2.3.2 Summary of water quality impacts

  • Beaver wetlands and dam sequences can change parts of freshwater ecosystems from lotic to lentic systems impacting upon sediment regimes and biogeochemical cycling.
  • By slowing the flow of water, suspended sediment and associated nutrients are deposited, with ponds shown to be large sediment and nutrient stores.
  • Increased water availability, raised water tables, and increased interaction with aquatic and riparian vegetation have all been shown to impact positively upon biogeochemical cycling and nutrient fluxes.

That’s a lot of service for the mild inconvenience beavers cause in our lives. You would think everyone would be jumping at the chance to have them.

3 BEAVER IMPACTS UPON LIFE—CONTEMPORARY UNDERSTANDING

3.1 Impacts of beaver upon aquatic ecology

Enhancement of natural processes, floodplain inundation, lateral connectivity, and structural heterogeneity in beaver‐impacted environments creates a diverse mosaic of habitats. Such habitats are underpinned by greater provision of food, refuge, and colonizable niches, which form the cornerstone of species‐rich and more biodiverse freshwater wetland ecosystems (Brazier et al., 2020; Campbell‐Palmer et al., 2016; Gaywood et al., 2015; Gurnell, 1998; Rosell et al., 2005; Stringer & Gaywood, 2016). Readers are directed to three reviews on this topic: Stringer and Gaywood (2016), which provides a comprehensive overview of the impacts of beaver on multiple species, Dalbeck et al. (2020) which considers the impacts of beavers on amphibians in temperate European environments and Kemp, Worthington, Langford, Tree, and Gaywood (2012) which provides a valuable meta‐analysis of the impacts of beaver on fish. This section builds on these reviews to summarize the findings of research into the impacts of beaver activity on aquatic plants, invertebrates, and fish. We focus on these groups as they are widely considered to be strong indicator species of freshwater health and function (Herman & Nejadhashemi, 2015; Law et al., 2019; Turley et al., 2016).

Gosh. This is a bucket of information. If you’re teaching a webinar any time soon I want to be in the front row.

3.1.4 Aquatic ecology summary

  • Beaver activity extending wetland areas aids aquatic plant recruitment, abundance, and species diversity.
  • Nutrient‐rich beaver meadows result in mature beaver managed landscapes, contributing diverse plant life, and increasing patchiness in otherwise homogeneous (especially intensively farmed) landscapes.
  • Heterogeneity of beaver habitat leads to greater diversity of invertebrates, benefitting both lotic, and lentic species.
  • Slow release of water from beaver ponds elevates baseflow downstream supporting greater aquatic life, improving resilience especially in times of drought.
  • A multitude of benefits accrue for fish due to beaver activity such as increased habitat heterogeneity and food availability.
  • It is established that salmonid species can navigate beaver dams, though there is evidence that the presence of dams does alter the way they move within river networks. The impact of dams on salmonid movement is highly dependent on location and upstream movement may be reduced in low gradient, low energy systems.

It occurs to me as we’re pulling info together to convert California into beaver understanding this is not a bad model. Starting from the basics and assuming everyone forgot what the culture knew 400 years ago isn’t a bad idea. California never learned these lessons. So its time we start teaching them slowly.

4 CONCLUSION: FUTURE SCENARIOS AND CONSIDERATIONS

The beaver is clearly the very definition of a keystone species. The myriad ways in which it alters ecosystems to suit its own needs, which in turn supports other species around it, demonstrate its value in re‐naturalizing the heavily degraded environments that we inhabit and have created. The impacts of beaver reintroduction reviewed herein; to deliver changes to ecosystem structure and geomorphology, hydrology and water resources, water quality, freshwater ecology and humans, and society are profound. Beaver impacts are not always positive, at least from a human perspective, thus it remains critical that the knowledge gaps identified above are addressed as beaver populations grow, to ensure that improved understanding coupled with clear communication of beaver management can prevail.

I want to prevail. Don’t you?  How much do you love this article? Go send it to everyone you know that is sitting on the fence about beavers. I knew it would be good but I never guessed it would be THIS GOOD. It even finishes with a discussion of how beavers and humans interact, the conflict it can cause and the GOOD THINGS it can bring.

 


We live vicariously.

Since Martinez no long has a thriving beaver population, I get a little thrill from hearing about the fairfield beavers, or the Sonoma beavers. or the Napa beavers. We love to learn about beavers and their reception from afar. It’s the second best thing to being there.

And when England proclaims that beavers should be reintroduced or Oregon argues why beavers matter and their lives should be protected on public lands, well we live vicariously through that too. This one is from Quinn Read, the policy director for the Center for biological diversity in Oregon.

Beavers can’t get a break in Oregon, the Beaver State

Who knew that beavers — those industrious, buck-toothed, mutant-tailed rodents — would still have such a rough go of it in Oregon?

We are the Beaver State. There’s even a beaver on our state flag. (Sure, it’s on the back of the flag, but it’s there.) Yet beavers are classified by law as predators and “furbearers,” a terrible moniker that, if applied to other species, would define salmon as meat-tubes and mule deer as antler-holders. This means beavers can be hunted and trapped across Oregon with few restrictions.

Refill that coffee cup, You just know this is going to be good.

And recently the Oregon Fish and Wildlife Commission rejected a petition that would have given beavers a break and closed federal public lands to commercial and recreational hunting and trapping.

Beavers rival humans in their ability to shape the landscape. Fortunately for us they do a much better job of it. In fact, we’ve spent untold millions of dollars trying to recreate what beavers do naturally.

Wetlands restored or created by beavers help mitigate the harmful impacts of climate change. Dams and ponds keep water on the landscape longer, slow water flows to prevent erosion and decrease flood damage, replenish the water table and even trap carbon.

Nice! Do trappers mitigate climate change or save water? No they do not. Say what you want about the age old skill passed on from father to son but trappers don’t increase biodiversity OR prevent erosion.

So beavers win.

During the commission’s Nov. 13 hearing, no one denied the important role beavers play in restoring and maintaining healthy ecosystems. But the group refused to have a science-based discussion on the impact of hunting and trapping on beavers and their activities.

Instead, the commission created a workgroup with a vague direction to analyze and provide guidance on beaver management without a timeline or any anticipated rulemaking. This decision ignores the fact that there is already a beaver workgroup and it hasn’t actually worked. It remains to be seen how or if this process will be different.

Beavers deserve better from the Beaver State.

The commission must be held accountable for reforming beaver management, and it must do so on a reasonable timeline. It must consider beavers in the context of climate change, the extinction crisis and water pollution and scarcity. And it cannot ignore the impact of hunting and trapping, which is under the commission’s direct authority to regulate.

No it can’t. Nor should it. Obviously public lands need to be preserved in a way that protects the interest of the greatest public good. Let’s see, in all of Oregon are their more trappers or people who drink water?

I’ll wait while you do the math.

If this commission won’t do its job, it’s incumbent upon Gov. Kate Brown to appoint commissioners who will. We need a commission that listens to science, respects the public and prioritizes conservation.

Today, with climate change bearing down on us in the form of extreme droughts, wildfires and floods, we understand that we cannot afford to turn our backs on such an important ally. 

AMEN!  I hope that makes the department heads squirm uncomfortably. Beavers will never win until it is in bureaucrats best interest to let the win. And I’d say columns like this help enormously. Great work Quinn.

It’s Saturday. Let’s have some more vicarious living from our friends in San Luis Obispo.

SLO County Beaver Brigade raises awareness of beavers in the Salinas River

Spotting a beaver-made dam is like walking into another world, according to Audrey Taub.

“You’re walking through this sandy-dry arid environment, and then all of a sudden it’s green, lush, and full of birdsong and herons. You can even see the fish and frogs,” Taub said. “Something big is happening here.”

Taub founded the San Luis Obispo County Beaver Brigade, a local advocacy group whose efforts include raising awareness about beavers in the county and educating the community about how beavers benefit wetland habitats.

Well, well, well. This may require a second cup of coffee. And a donut. Audrey  is our friend from way back and SLO is rapidly becoming the Martinez of the next generation.

The brigade is now working with Emily Fairfax, an assistant professor of environmental science and resource management at California State University Channel Islands.

Fairfax and Taub connected because Fairfax was moving to California from Colorado and wanted to find areas with beaver populations to study. She’s studied beavers her entire academic career.

A Google search led her to the Beaver Brigade, and now Fairfax studies SLO County beavers and leads educational walks to limited groups—for the time being.

Through her research thus far, Fairfax found that beavers have been present in the Paso Robles region of the Salinas River since 2013. In that time, 59 unique dams have been fairly active.

Biodiversity First! developed a university-funded grant opportunity for Fairfax and a group of students to study beaver complexes in the upper Salinas River through 2021. The grant, “Beavers, Climate Change, and Ecosystem Resilience,” will result in the first peer-reviewed study of beaver habitat in San Luis Obispo County.

This is the kind of story you want to tell your children every Christmas.  Regular people banding together to make a difference for beavers and the world.

In Southern and Central California and in the Salina River, especially, Fairfax said, the most pressing benefits of beavers is their ability to create wetland habitats that are resistant to stressors like droughts and wildfires.

“The way that beavers dig channels around the landscape, ultimately, makes it so that these patches in the landscape can withstand droughts and fires because it’s so soggy. It just holds a lot of water there and keeps it green and lush even when the rest of the landscape has been put into a degraded and stressed-out state,” she said.

Over the next year, Fairfax and her student group are hoping to continue locating beaver dams, identify the number of beavers in the area, understand their activity in the upper Salinas River, observe beaver activity during droughts, and study water quality.

Hurray! Beavers get way more respect if you attach a scientist to them. It’s not the way it should be, of course. But it’s the way it is. That works because any persuasive power that can help us keep beavers on the landscape is GOOD. In Martinez it was voters and their children. But in SLO it might be science.

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